/HR/ Ham Radio thread: antenna edition

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/HR/ Ham Radio thread: antenna edition Anonymous Sun Mar 4 08:55:41 2018 No.1343155 [Reply] [Original]

In this thread we talk about:
- ham radio
- projects you have going on related to radio
- baluns and ununs on salvaged cores
- compact all-band antennas that fit into matchbox
- SDR
- discussing how should a new general trhead look like.
FAQ: In this thread we talk about:
- ham radio
- projects you have going on related to radio
- baluns and ununs on salvaged cores
- compact antennas for 160m band.
- SDR
- discussing how should a new general trhead look like.

Current data on propagation is here: http://wsprnet.org/drupal/wsprnet/map

Online SDR's networks: websdr.org sdr.hu

Learning morse code: lcwo.net www.justlearnmorsecode.com

FAQ: ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview2.htm

Previous thread is here >>1333382

>>	Anonymous Sun Mar 4 09:29:19 2018 No.1343179 >>1343155 Good work, anon >ftp Just remember username/password is guest

>>	Anonymous Sun Mar 4 09:32:32 2018 No.1343182 >>1343179 >Good work, anon No it's not, I've messed up the description, but I recon it will still do it.

>>	Anonymous Sun Mar 4 09:50:50 2018 No.1343190 i have a 30 ft wire. if i climb a tree and put it up there can it be used as an antenna?

>>	Anonymous Sun Mar 4 09:54:15 2018 No.1343197 >>1343190 sure, or you can use a sling shot and some fishing line to drag it up higher

>>	Anonymous Sun Mar 4 10:24:11 2018 No.1343214 >>1343190 What band/frequency range you are into You also need good enough ground unless you go for example with Fuchs antenna

Anonymous Sun Mar 4 11:09:32 2018 No.1343238

>ARRL is pushing to give people with technician class licenses the ability to use HF digital and phone modes with up to 200 watts
>hear people say that doing so with kill local VHF/UHF activity similar to what happened in the UK when they added all mode HF up to 10 watts with their basic license
>think how much worse could that really be than it already is
>RepeaterBook shows the UK only has 543 repeaters in the country
>New York state has 760 repeaters with about 3/5 the land area of, a bit under 1/3 the population of the UK, and 18% more amateur radio operators per capita (effectively a bit over 1/3 the population of amateur radio operators)
>North Carolina has 583 repeaters with about 3/5 the land area, a bit over 1/8 the population of the UK, and 72% more amateur radio operators per capita (effectively about 1/4 the population of amateur radio operators)
>when adjusting for population of amateur radio operators, vs New York state or North Carolina the UK should have 2280-2332 repeaters
>when adjusting for repeaters per land area, vs New York state or North Carolina the UK should have 972-1267 repeaters
Jesus fucking christ, I guess we can expect local VHF/UHF local activity to reach levels of death we never previously thought possible in the future if the ARRL gets this passed considering that's 1/2 to 1/4 the number of repeaters (if the numbers actually happen to scale). On a side note, I wonder who will buy the rest of the 1.25 meter band because there's no way that will stay around and what other bands we'll see sold off due to lack of use.

Numbers are from RepeaterBook, the FCC ULS, and http://www.arrl.org/news/ofcom-releases-uk-amateur-radio-license-stats

Anonymous Sun Mar 4 11:50:43 2018 No.1343258

The radio FAQ is updated to preview 3:

ftp://guest@guest:collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview2.htm

Main addition is the table for antenna length, much thanks for the input. Could someone check the table is right?

Also, what next to add? Bandplans perhaps?

>>	Anonymous Sun Mar 4 11:51:57 2018 No.1343259 File: 163 KB, 400x292, FixedTree.gif [View same] [iqdb] [saucenao] [google] >>1343258 That was of course ftp://guest@guest:collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview3.htm

>>	Anonymous Sun Mar 4 11:59:37 2018 No.1343265 File: 3.75 MB, 6300x4031, United_States_Frequency_Allocations_Chart_2016_-_The_Radio_Spectrum.pdf.jpg [View same] [iqdb] [saucenao] [google] >>1343258

Anonymous Sun Mar 4 12:10:28 2018 No.1343270

>>1343265
Sure, a few of those are on the FTP site, one directory above the FAQ. What I was thinking of was an overview of the 160m, 80m etc bands, if there is an interest.

This can quickly escalate in complexities, mainly because ARRL has paywalled most of the interesting bits.

Anonymous Sun Mar 4 17:04:27 2018 No.1343460

>>1343238
Why would they do this; the general ticket is not hard? What we don't need is more Baofags splattering (attempted) digital signals across the bands. I doubt it will kill VHF/UHF, these people really just want to be able to walk around with a radio pretending to be a LEO or firefighter. If they aren't doing that they are choking the repeaters/nets chasing storms.

>>	Anonymous Sun Mar 4 17:33:56 2018 No.1343478 >>1343460 >If they aren't doing that they are choking the repeaters yes, we really cant get in the way of old men talking about problems and their bodily functions

>>	Anonymous Sun Mar 4 17:47:33 2018 No.1343482 >>1343460 Of course it won't kill the whackers, preppers, and weather nets, but it sounds like it might kill a good bit of everything else.

>>	Anonymous Sun Mar 4 17:56:42 2018 No.1343489 >>1343482 If they're going to do it, I want the Tech exam to be more difficult; 35-40 questions with 30% of it being current General Exam questions on the technical side and no "grandfather clause" for current techs (A Tech Plus, if you will)

>>	Anonymous Sun Mar 4 17:58:27 2018 No.1343491 >>1343238 I'll just blame that on brits not being as invested in ham radio to begin with. It's not like they ever had the vast open territories of the US that required wireless communication.

>>	Anonymous Sun Mar 4 18:06:40 2018 No.1343495 >>1343258 You need a wiki

>>	Anonymous Sun Mar 4 18:29:33 2018 No.1343508 7.19710 MHz 9A9R (Croatia) is contesting right now and the band is great at the moment. I got a 59 report from him from IL on 100 watts.

Anonymous Sun Mar 4 21:50:15 2018 No.1343608

Whats a good recommendation for a (cheap) Ham radio base station?
I've got a budget of about $150, but I'd prefer something closer to $80.

I don't really care what band, just as long as it works well and will accept audio input (for digital modes and SSTV).

Anonymous Sun Mar 4 22:30:18 2018 No.1343635

>>1343608
Ouch. Um... You might get a decent Chinesium Dual Band UHF/VHF mobile to use as a base for that price (plus you will need a power supply rated for ten amps at least), but nothing used that will work in HF for that price.

You *might* find a used Alinco HF +50 Mhz Base station for $250 if you're lucky.

>>	Anonymous Sun Mar 4 22:36:39 2018 No.1343637 >>1343635 No offense, but I guess I'll go with a baofeng then. I'm not ready to really shell out for a radio yet.

>>	Anonymous Sun Mar 4 22:36:56 2018 No.1343638 File: 88 KB, 443x522, mmm hmmm.jpg [View same] [iqdb] [saucenao] [google] >>1343608

>>	Anonymous Sun Mar 4 22:41:02 2018 No.1343640 >>1343638 Only just got my general. Not really invested enough yet to warrant shelling out the big bucks. I was kinda hoping that I could get something nicer than a baofeng mobile.

>>	Anonymous Sun Mar 4 22:43:16 2018 No.1343642 >>1343640 Don't waste your money on that piece of shit then.

>>	Anonymous Sun Mar 4 22:47:23 2018 No.1343644 >>1343642 Well aren't you just a bowl of fucking sunshine.

Anonymous Sun Mar 4 22:52:10 2018 No.1343648

>>1343637
No offense taken. Baofengs are fine 1st radios in my opinion.

Go to Amazon and get the "USA Warranty" factory refurbished ones. They have a harder case, well tested and only $28. DO get a Naygoya or Expert Power 771 antenna for it though.

I have 6 of them for emcomm and they're not bad little radios.

Anonymous Sun Mar 4 22:58:18 2018 No.1343649

>>1343608
you might get a single or dual band HF kit for that money, IF you already have a decent soldering station

>>1343648
>DO get a Naygoya or Expert Power 771 antenna for it though
can confirm, the extended duck is helpful, if a bit unwieldy. can recommend getting a handheld speakermic if it or the pendant+earpiece cramps your style

Anonymous Sun Mar 4 23:00:55 2018 No.1343652

>>1343642
I run a lot of good equipment including a TS-2000, IC-7300 and an FT-991A along with a bunch of Big Three HTs and some Motorolas but I also keep a bunch of Baofengs around for emergencies/SAR, loaners if another ham needs a radio and to take mountain biking and sailing. If I lose/break/never return one of those little radios, I'm not going to be upset.

The guy got his General and is testing the waters, a cheap radio is fine for local repeaters.

>>1343640
Find your local radio club and talk to them. Most allow non-members to swing by their meetings. Tell them you are new to Ham and would really like to see what the HF world is like before you invest in an expensive set up. There will be a general or extra there who let you come over and see their set up and play around a little.

Also try
>RemoteHams.
>com and register.
You can use other people's radios online and see what's out there.

Anonymous Sun Mar 4 23:08:59 2018 No.1343655

>>1343648
Thanks!
I'll look at those antennas.

>>1343649
Soldering is no problem! I've even got a hot air rework station.
Where would I look for these kits?
Heathkit is long dead, and Ramsey shut down last year.
I've tried looking for schematics so I can make one from scratch, but they're almost all for either receivers or CW transmitters.

>>1343652
I actually got my general through my college's Ham radio club.
I'm planning on making it to their next meeting.

I just kinda want my own little radio that I can set up in my room to connect to their repeater.
Doesn't have to be anything fancy, but I was kinda hoping for something a tad better than a baofeng.

>>	Anonymous Sun Mar 4 23:15:08 2018 No.1343657 >>1343655 Get a mono band Icom. It'll set you back about $100.

>>	Anonymous Sun Mar 4 23:16:47 2018 No.1343658 >>1343655 >something a tad better than a baofeng. Maybe a Radioddity GD-77? It's going to offer you a few things: It's dual band, has DMR-2 and is only $90. I would still get a better antenna for it. Rubber ducks suck.

>>	Anonymous Sun Mar 4 23:22:26 2018 No.1343660 >>1343658 Same poster here. In fact, I'm going to get one of these as my next HT. Can't go wrong with the price for something that does DMR-2/DMR II.

Anonymous Sun Mar 4 23:24:46 2018 No.1343663
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>>1343655
>tfw hot air rework station
in 9001 hours of google searching I found this single bander for $120 including speakermic www.crkits .com/
if I were going totally homebrew on that kind of money, I'd probably start with the mcHF RF/IF, but only populate 1/4 of the filters, and skip the pretty display and soundcard-style digital AF in favor of a commodity character LCD and a simple analog AF

Anonymous Sun Mar 4 23:34:23 2018 No.1343671
File: 491 KB, 1280x479, mcHF.jpg [View same] [iqdb] [saucenao] [google]

>>1343663
The new mcHF 3.0 boards pisses me of.
1). He stocks 3 at a time (if that) and they sell out before I even get an update that they're for sale
2). The god damn E1 (Mouser# 652-ENA1J-B28-L064L) is $52
3). The build over a V2.0 board has increased from $210 in parts to nearly $350.

>>	Anonymous Sun Mar 4 23:40:35 2018 No.1343674 >>1343663 >>1343671 >$500 usd for the complete kit Fuck me. I could get a really nice Icom for that price. I'm contemplating if it would actually be cheaper to recreate some of the old vacuum tube designs.

Anonymous Sun Mar 4 23:45:53 2018 No.1343677

>>1343674
And the Icom wouldn't just be a QRP, either. I've seen good 7100s going for that price.

As for old valve designs? Not any more. When the Cold War ended and the market was flooded with NOS Soviet valves? Easily, a homebrew would have been cheap. Now? Not so much.

Anonymous Mon Mar 5 00:06:20 2018 No.1343688

>>1343671
>bourns pro audio
sheeeeeeeit, buy chink 600ppr encoders for like $20
at least the firmware has an open fork

>>1343674
probably not, you can't get much simpler than the "Tayloe" detector (which can also be run in reverse for upconversion)
just don't go all gold plated like mcHF guy seems to be doing

Anonymous Mon Mar 5 00:15:23 2018 No.1343692

>>1343652
>IC-7300 and an FT-991A
How do you like them? Which one do you prefer?

Looking around now for something to use at home so my IC-706 can become part of a portable setup, both of those models look like they might be a decent step up from it without costing a fortune

>>	Anonymous Mon Mar 5 00:15:26 2018 No.1343693 >>1343688 >Tayloe detector Holy shit that's simple. How have I not seen that before. I could make one of those with just three 74xx series logic chips. Throw that into an FPGA and you might be able to make it up into the 2 meter band.

>>	Anonymous Mon Mar 5 00:28:25 2018 No.1343702 >>1343693 ikr? it has some compelling performance figures too >FPGA it requires analog switches, anon. 74HC4066 should work for the longer bands >2m "just" need a fast enough skew-free quadrature clock and a fast enough analog switch

>>	Anonymous Mon Mar 5 00:32:02 2018 No.1343707 >>1343692 Eh, for home? I regret swapping my TS-590SG for the FT-991A. I should have just slapped a panadapter on the SG. The FT-991A just can't compare to the DSP and AGC the 590 has. Not worth the Scope in trade.

Anonymous Mon Mar 5 00:40:04 2018 No.1343710

>>1343702
I'm pretty sure I could implement it on a FPGA.
Just need to use a ADC for the input, and a delta-sigma DAC can be implemented inside the FPGA.

I was looking at the ICE40HX series, and they'll run at 175mhz, with only 7ns delay per LUT.
I think that'll work.
The ICE40HX is dirt cheap too. Like, complete transceiver for $30 cheap.

If I could get this working, this would pretty much be the holy grail for budget transceivers.
Everything from 160m to 2m for just $30.
Is there really no drawback to the Tayloe detector? I feel like if this is so simple then we'd already be seing this design everywhere.

Anonymous Mon Mar 5 00:46:26 2018 No.1343711

>>1343710
>I'm pretty sure I could implement it on a FPGA.
No, you can't
>>1343710
>I think that'll work.
I wouldn't
>>1343710
> Like, complete transceiver for $30 cheap.
No, it would be much more than that
>>1343710
>If I could get this working, this would pretty much be the holy grail for budget transceivers.
No wouldn't be able

>>1343710
>Is there really no drawback to the Tayloe detector? I feel like if this is so simple then we'd already be seing this design everywhere.
Its drawbacks depend on application. It's not suitable for 2M.

The most cost-effective option is taking DDC/DUC route, probably with extra (analog) up/down conversion.

>>	Anonymous Mon Mar 5 00:50:22 2018 No.1343716 >>1343711 Go be a miserable cunt somewhere else.

>>	Anonymous Mon Mar 5 00:56:20 2018 No.1343720 >>1343716 Go to /ohm/ if you are after loads of uneducated opinions and encouragement.

>>	Anonymous Mon Mar 5 00:59:31 2018 No.1343724 File: 1.20 MB, 352x217, 1501789597526.gif [View same] [iqdb] [saucenao] [google] >>1343711 >>1343720 Just because your retarded ass can't design anything doesn't mean that other smarter people can't.

Anonymous Mon Mar 5 01:22:28 2018 No.1343734

>>1343724
Yes, I'm that retarded that I KNOW for sure you will never be able to design a 160-2M transceiver for $30 (that's BOM only) esp. with tayloe I/Q modulator and no builtin transverter(s) for VHF band. Unless you rob digikey stores and start selling parts for peanuts.

Anonymous Mon Mar 5 01:26:27 2018 No.1343735

>>1343734
By saying 160-2M transceiver I mean a transceiver that covers at least ham bands, supports at least SSB TX/RX, has at least 1-2W of output power, and low-tier performance regarding to sensitivity/dynamic range/etc comparable to chinese hand helds.

Anonymous Mon Mar 5 01:38:49 2018 No.1343737

>>1343495
>You need a wiki
Hard to set up one without doxxing yourself. The FTP site was provided by a 4chan poster about a year ago and is used mainly by >>>/g/cyb and /ham/ and has plenty of capacity.

While we don't have a wiki you can always upload updates yourself or submit things to add here and I'll put it in.

Anonymous Mon Mar 5 02:28:23 2018 No.1343745

>>1343720
found the whacker

>>1343737
/ohm/ had a wiki at printf.pl which may still exist. you're right though,
>trusting the platform

>>1343710
>7ns per LUT
the QSD requires a 4x clock so 1.4ns at 2m. WELP
please tell me you're not that "muh snapdragon" anon

Anonymous Mon Mar 5 02:53:43 2018 No.1343754

>>1343745
>found the whacker
It's just common sense dude.
DIY board if full of ambitious people who think that it's possible to replace knowledge and education with ambitious & fantasy.
Good thing guys like tend to gravitate towards /ohm/ thread if we speak about EE/RF. That way we have less nonsense discussion going here.

>>	Anonymous Mon Mar 5 03:30:24 2018 No.1343765 >>1343745 >printf.pl It is still there but seems as dead as the 4chan space project. Another wiki notes problems with spam. All in all it seems the FTP site is safer though sFTP would of course be better.

>>	Anonymous Mon Mar 5 03:49:50 2018 No.1343772 Has anyone tried the Xiegu X-108G? I already have a TS-430s but want something more portable for HF. Am college student, can't afford the big brand name portables.

>>	Anonymous Mon Mar 5 04:10:55 2018 No.1343779 >>1343754 >DIY board if full of ambitious people who think that it's possible to replace knowledge and education with ambitious & fantasy. found the /g/tard >less nonsense discussion leaving what? buyfags belong on /g/

Anonymous Mon Mar 5 05:16:31 2018 No.1343792

>>1343745
>please tell me you're not that "muh snapdragon" anon
Not him but it cannot be him since it was me that brought Snapdragon up. I don't have a religious relationship to that chipset family, it is just that mobile chipsets in general are optimised for power efficiency and DSPs optimised for baseband. That should be ideal for SDR.

Raspberry Pi is not a bad machine and the ecosystem is very good. It just lacks a DSP. Videocode can do FFT but is not optimised for baseband tasks.

Anonymous Mon Mar 5 06:11:58 2018 No.1343810

>>1343779
>leaving what? buyfags belong on /g/
Fuck my life we got another retard. Please shomw me how many amateur are working with self-designed/self-built rigs. 0.01%? GTFO

>>1343792
>Not him but it cannot be him since it was me that brought Snapdragon up. I don't have a religious relationship to that chipset family, it is just that mobile chipsets in general are optimised for power efficiency and DSPs optimised for baseband. That should be ideal for SDR.
Oh no, not that shit again. For DDC/DUC you an FPGA as modern DSP's aren't well suited for that specific job. For IF-DSP approach it's more or less suitable, but not cost efficient. Look what major brands use & look what amateurs use if you want to know more.

>>	Anonymous Mon Mar 5 06:15:52 2018 No.1343811 >>1343810 >Fuck my life we got another retard. Please shomw me how many amateur are working with self-designed/self-built rigs. 0.01%? GTFO then, indeed, this thread has no fucking business on /diy/ be/g/one thot

>>	Anonymous Mon Mar 5 06:48:56 2018 No.1343823 >>1343811 Kiddo, you are using a phone/PC/tablet/TV/car/etc and all that stuff was bought. Please, GTFO then.

Anonymous Mon Mar 5 06:54:41 2018 No.1343825

>>1343810
>For DDC/DUC you an FPGA as modern DSP's aren't well suited for that specific job.
Care to expand on that?

>For IF-DSP approach it's more or less suitable, but not cost efficient.
This too I'd like to hear more about.

>Look what major brands use & look what amateurs use if you want to know more.
I have. Some SDRs use FPGAs but major brands tend to use FP DSPs from TI. And I had expected fixed point DSPs to be more suitable.

Anonymous Mon Mar 5 07:55:13 2018 No.1343844

>>1343825
>Care to expand on that?
For digital down conversion you must process hundreds of million samples per second, you don't need fancy math (not only floating point isn't needed but often you can get way with addition/subtraction mostly). I.e. you need sheer power to filter & decimate signal, then after sample rate is reduced you can process the signal with more complex algorithms. The best tool for the job is FPGA, it's massively parallel by design, you can easily wire any ADC, you can easily hook FPGA to any MCU/DSP.
"Conventional" DSP are used for more challenging operations, they have few ALU's, few address generators, few register sets, few address spaces, few on-chip RAM "caches" and so on. And as aresult they are able to perform very complex calculations, however for DDC it's not needed at all, and a DSP that can beat an FPGA in DDC/DUC application would cost a fortune. However you can built a basic DDC/DUC rig using an FPGA in QFN package (like EP4C22 or something more advanced)

>>1343825
>>For IF-DSP approach it's more or less suitable, but not cost efficient.
>This too I'd like to hear more about.
With IF DSP you can use lower speed ADC's, sample rate is lower, you can omit filtering & decimation. Same applies to direct conversion rigs, like mcHF / m0nka. Going with DSP's that used in mobile phones is again not cost effective, PCB complexity is much higher (modern phones all have 10-12 layers PCB's), you are getting a lots of features you aren't gonna use. You can get away with modern cortex-m4f/m7 MCU in QFP package and have double/four layer PCB.

>>1343825
>I have. Some SDRs use FPGAs but major brands tend to use FP DSPs from TI. And I had expected fixed point DSPs to be more suitable.
FPGA is needed for DDC/DUC designs, for IF-DSP with low IF they opt for a DSP only.

>>	Anonymous Mon Mar 5 10:00:05 2018 No.1343899 Oh? What’s this? Someone else has already implemented a Tayloe detector on a FPGA. https://pdfs.semanticscholar.org/27d7/1062c1f1e903d4aab201ff6c87f94b1f225.pdf GTFO, you retarded naysayer faggot.

>>	Anonymous Mon Mar 5 10:21:32 2018 No.1343905 >>1343899 >https://pdfs.semanticscholar.org/27d7/1062c1f1e903d4aab201ff6c87f94b1f225.pdf 404 not found Are you sure you got everything right and have something to back your claim? You got an FPGA with analog switches?

Anonymous Mon Mar 5 10:25:20 2018 No.1343907

>>1343899
>u retarded naysayer faggot.
>>1343811
>be/g/one thot
I wonder if these posters are dumb kids or just people with ass burgers, who fail to communicate w/o spitting insults constantly.
No valid arguments, no knowledge, just raw ambitions. Millennials? :\

>>	Anonymous Mon Mar 5 10:26:41 2018 No.1343908 >>1343905 https://pdfs.semanticscholar.org/27d7/1062c1f1ed903d4aab201ff6c87f94b1f225.pdf >muh analog switches What is an ADC? I mean, how do computers record audio? They aren’t analog.

Anonymous Mon Mar 5 10:28:23 2018 No.1343909

>>1343907
>retarded comes in, shits on everyone’s projects, and provides zero constructive criticism.
Gee, I wonder why everyone it shitting in him?
Can’t be because he’s a complete asshole who can’t stand the thought of someone else designing something.
No, can’t be that.

Anonymous Mon Mar 5 10:38:56 2018 No.1343912

>>1343908
You still
- don't understand what is a "tayloe detector"
- don't understand what is a difference between DDC/DUC approach and using an I/Q mod/demod
- you failed to read and understand what's written in the PDF you've posted
- you fail to understand that it's impossible to
>>1343899
>a Tayloe detector on a FPGA.
Because "Taylo detector" works in analog domain and the only option to implement it on an FPGA is to add a dedicated analog IP core

You are a typical 4chan /diy/er, no knowledge, no education, no ability to google & understand simple texts, yet you are full of ambitions and a dreamer.
I said earlier but the post got deleted, I'll repeat it again for you:
> go to /diy/ohm/ if you are after uneducated opinions and encouragement.

>>	Anonymous Mon Mar 5 10:39:22 2018 No.1343913 So we are never going to set up a net and talk to each other on ham radio because then we wouldn't be anonymous.

Anonymous Mon Mar 5 10:44:56 2018 No.1343915

>>1343909
>>retarded comes in, shits on everyone’s projects, and provides zero constructive criticism.
1) Show me any single project here.
2) We had a kid that struggled with a crystal radio and I helped him.
3) Saying "it will not work isn't shitting", it's a fact, it sad but true.
4) I haven't yet seen guys who are able to fucking google and read what they've found online, I'm not going to spoon feed them.

Anonymous Mon Mar 5 10:49:30 2018 No.1343919

>>1343915
>spoon feed
What? I didn’t ask you for shit.
I have more than enough knowledge to
Implement a Tayloe detector on my own.
You just barged in and started projecting your own insecurities on everyone else.

It’s okay to give criticisms and suggestions, but you did none of that.
All you can do is call people retarded.

>>	Anonymous Mon Mar 5 10:50:12 2018 No.1343920 File: 78 KB, 485x640, tumblr_lzxbjakcA91r5d0ngo1_500.jpg [View same] [iqdb] [saucenao] [google] >>1343915 >4) I haven't yet seen guys I was referring to /diy/ board on 4chan.

>>	Anonymous Mon Mar 5 10:51:18 2018 No.1343921 >>1343919 >Implement a Tayloe detector on my own. Aha, you can do it yourself in FPGA, and you can build 160-2M transceiver for under $30. Go on, impress me.

>>	Anonymous Mon Mar 5 10:53:59 2018 No.1343924 >>1343919 Yep this sounds like ham radio.

Anonymous Mon Mar 5 10:54:53 2018 No.1343925

>>1343919
>All you can do is call people retarded.
I did this once in this message:
>>1343810
>>leaving what? buyfags belong on /g/
>Fuck my life we got another retard. Please shomw me how many amateur are working with self-designed/self-built rigs. 0.01%? GTFO
I still think that guy is retarded since virtually all hams work with rigs that they actually bought, not built.

>>	Anonymous Mon Mar 5 10:54:59 2018 No.1343926 >>1343921 I fucking am asshole. I’ll check back in in a couple months, once I’ve had time to get the parts, make a board and test it.

>>	Anonymous Mon Mar 5 10:57:45 2018 No.1343929 >>1343926 Start with the simplest thing, smarty: post a structure diagram of the transceiver you are going to build & highlight major requirements for each block. Also are you serious you can do "tayloe detector" on an FPGA and make it work on 2M?!

Anonymous Mon Mar 5 11:08:10 2018 No.1343937

>>1343924
>Yep this sounds like ham radio.
That sounds like a kid with severe butt hurt, who never ever designed anything, yet brags he can do wonders and design a groundbreaking rig for under $30.
For fucks sake only connectors + passive components + power management IC's would likely be over $30, if you add octave BPF for RX and LPF for TX you'll be well over $100.

>>	Anonymous Mon Mar 5 11:12:14 2018 No.1343939 >>1343937 100 year old technology says he designed something new. now I know your retarded. I think your searching for the cb radio general.

>>	Anonymous Mon Mar 5 11:29:39 2018 No.1343954 >>1343608 Why not an sdr play?

>>	Anonymous Mon Mar 5 12:03:30 2018 No.1343983 >>1343954 Because that can’t transmit.

Anonymous Mon Mar 5 13:30:05 2018 No.1344041

>>1343912
we don't want these morons in /ohm/ either. send them to /g/ or better yet /b/

>>1343925
>on rigs they actually bought, not built
thereby defeating half the purpose of amateur radio, that of improving skills in the technical phase of the art
and this, not old men with hemorrhoids and body odor, is why ham radio is dead

>>1343926
that should give me just enough time to perfect my popcorn recipe

Anonymous Mon Mar 5 14:03:44 2018 No.1344058

>>1344041
>thereby defeating half the purpose of amateur radio,
Come on, you know he's right.
The /diy/ side of ham radio tends to revolve around antennas, mobile setups and other shit required to keep the (bought) radios happy. Not that you can't spend your time building rigs, if that's your main interest.

>>	Anonymous Mon Mar 5 14:07:27 2018 No.1344061 >>1344058 >literally CB with protocols if he is right then all y'all need to fuck back off to /g/

>>	Anonymous Mon Mar 5 14:39:11 2018 No.1344085 File: 22 KB, 480x360, Hap.jpg [View same] [iqdb] [saucenao] [google] >>1343907 >Idiots who are trying to reinvent the wheel, while having no idea what they are talking about. Then, BS out their ass about it.

>>	Anonymous Mon Mar 5 14:41:23 2018 No.1344086 >>1343926 good LARP, man.

>>	Anonymous Mon Mar 5 16:20:57 2018 No.1344135 >>1343765 >as dead as the 4chan space project RIP >>1343926 Rooting for you, if only to see how well any old anon can use an FPGA for RF.

>>	Anonymous Mon Mar 5 16:22:18 2018 No.1344138 >>1343915 >1) Show me any single project here. FAQ dude here: we are getting a a FAQ underway. OK, so not much solder smoke coming outta that one, but hey, it is at least something. Now, getting a HF rig design would be cool.

Anonymous Mon Mar 5 21:13:43 2018 No.1344324
File: 179 KB, 500x345, aces.png [View same] [iqdb] [saucenao] [google]

Don't have a radio yet, but I connected to a conference server just a bit ago to check out a Trivia Net (sounded neat).

Two people were given Geography questions were "Name the Country XXXXXX" and one said "Asia" and another said "Africa."

>>	Anonymous Mon Mar 5 22:29:08 2018 No.1344356 >>1344324 my mom says there's a lot of black people in Africa WW8GM perchance?

Anonymous Mon Mar 5 22:36:29 2018 No.1344362

>>1344356
Kek, it was. Using the Guild server. I just happened upon it this week and wanted to see what it was like. I have some port issue on my computer where I can connect and listen, but can't TX. Still waiting for my HT to arrive in the mail, so I just listen to what I can online.

>>	Anonymous Mon Mar 5 23:07:10 2018 No.1344373 I had a contact on CB today in São Paulo Brazil then one in eastern Washington. 10 meter was dead as usual. I mean the internet says band closed and poor every day for all bands. How was working the 2m repeaters today guys.

Anonymous Mon Mar 5 23:16:59 2018 No.1344374

>>1344362
yeah, Michigan K-12 education is just enough to make good little factory cogs that can't see beyond the end of their own nose and breed their own next generation through accident and stupidity
anyway
GMARC does run some decent nets occasionally. they got a technology net running Tuesday nights. I wasn't really interested in the topic the one time I was able to listen, but it could be good. they have a YL net on Thursday nights, but... well, I can't fairly evaluate it since I'm not really the target audience
someone really ought to run an AD&D net. that would get some (relatively) fresh people into the hobby, for sure

Anonymous Mon Mar 5 23:26:41 2018 No.1344377

>>1344374
Yeah, I looked at their website. Seems to be a pretty big club with 200 members. I saw the Tech net tomorrow and I'm going to listen on Broadcastify. They also do an HF net at 1300 Michigan time on 7.2775 that I plan on listening to on an WebSDR.

I'm going to Detroit in April for work, so I'd like to play on their repeater when I'm up there.

>>	Anonymous Tue Mar 6 15:06:46 2018 No.1344800 7200 shitshow is going ape today.

>>	Anonymous Tue Mar 6 16:40:34 2018 No.1344850 >>1343926 If you could even make it work from 160meters to 40 meters, that would be cool.

>>	Anonymous Tue Mar 6 17:44:06 2018 No.1344873 >>1344377 If you want to listen to WW8GM UHF you can sidestep the screen crap and point VLC to: http://relay.broadcastify.com:80/xq7y3hmp2t6c

Anonymous Tue Mar 6 17:51:55 2018 No.1344876

>>1344850
Yeah, after doing some math and really rough testing, it looks like an FPGA is going to top out about 6 meters.
I might be able to hit 2 meters with some PLL abuse, but I don't know if it would be stable enough.

I found a better option though. ECL logic can clock up to +3.5ghz, so that means I could make a SDR transceiver that works from 160m to 70cm.
The only problem with ECL is that it's rather pricey.
Using a ICE40HX8k FPGA I could make the (barebones) transceiver for ~$40, but ECL would put the cost at more like $80.
Still though, that would be a literal do everything transceiver for $80, so not bad at all.

>>	Anonymous Tue Mar 6 18:40:45 2018 No.1344912 >>1344876 $30 was the goal YOU FAILED

>>	Anonymous Tue Mar 6 18:42:48 2018 No.1344915 >>1344876 What mulitplexor are you going to use for tayloe mixer?

Anonymous Tue Mar 6 19:28:43 2018 No.1344936
File: 48 KB, 800x729, ED059D3A-3395-4501-A557-9096AEA83531.png [View same] [iqdb] [saucenao] [google]

>>1344912
>YOU CAN’T MAKE IT! IT’S IMPOSSIBLE!
>Anon makes progress
>WELL YOU WENT $10 OVER THE TENATIVE BUDGET

Are you going to cry like this and be a faggot the whole way through his project?

Anonymous Tue Mar 6 19:29:51 2018 No.1344938

>>1344912
Once anon realizes that FPGA he is going to use is too small and he needs at least 20-30 times more logic elements and a few dozens of multipliers/dsp slices the price will go up further, expect it to be $30-50. Going with BGA package will require 4-6 layer board at least, that will increase the price as well. And that's just bare PCB + bare FPGA, nothing else, would be well over $50.

>>	Anonymous Tue Mar 6 19:55:53 2018 No.1344948 >>1344936 you made no progress, shitposting doesnt count you know

Anonymous Tue Mar 6 20:08:23 2018 No.1344952

>>1344915
Not too many choices for ECL
There's either the MC10EP57 or the SY100EP57V.
I'll probably go with the SY100EP57V, if I do the ECL version.

>>1344938
Nigger, the ICE40HX8k has 7,600 LEs.
What I have set out won't use more than 300.
Even if I needed more than that, ICE40s are fucking cheap. They're like $8 each, and come in TQFP.

>>1344948
Anon, you're the only one shitposting here.

>>	Anonymous Tue Mar 6 20:48:16 2018 No.1344974 File: 9 KB, 236x236, life-is-hard.jpg [View same] [iqdb] [saucenao] [google] >>1344952 >There's either the MC10EP57 or the SY100EP57V. >I'll probably go with the SY100EP57V, if I do the ECL version. Neither is suitable for Tayloe mixer. Good luck.

>>	Anonymous Tue Mar 6 22:03:57 2018 No.1345006 >>1344938 >>1344952 If this "project" were actually happen (because it a fucking LARP) you'd end up $2000 over budget.

>>	Anonymous Tue Mar 6 22:07:42 2018 No.1345007 File: 56 KB, 640x222, State of this guy.jpg [View same] [iqdb] [saucenao] [google] >>1344952 >>1344876

>>	Anonymous Tue Mar 6 22:15:09 2018 No.1345013 >>1345006 >>1345007 Do you have anything better to do than shit on projects 24/7 for zero reason?

>>	Anonymous Tue Mar 6 22:24:18 2018 No.1345016 >>1345007 >>1345006 Yeah that anon is stubborn as fuck. Not able to work in team, never asking for help, never saying sorry, never admitting a mistake, refusing to accept criticism as he knows he is always right.

Anonymous Tue Mar 6 22:30:03 2018 No.1345019
File: 375 KB, 486x640, yes.png [View same] [iqdb] [saucenao] [google]

>>1345013
>Do you have anything better to do than shit on projects 24/7 for zero reason?
>>1345016
>never admitting a mistake, refusing to accept criticism

P.S. we love you, despite you act like a dumass

>>	Anonymous Tue Mar 6 22:37:26 2018 No.1345022 File: 389 KB, 480x449, Dick.png [View same] [iqdb] [saucenao] [google] >>1345013 Nope

Anonymous Tue Mar 6 22:51:06 2018 No.1345025
File: 37 KB, 625x366, ihrepapiere.jpg [View same] [iqdb] [saucenao] [google]

>>1345022
Is that a shithead on your pic?
BTW what's wrong you, why are you so aggressive? Why are you literally LARP'ing instead of, well, reading a book on receivers/SDR? You learnt about ECL like a day ago, it will be a long way till you will be able to design a transceiver...

>>	Anonymous Tue Mar 6 23:17:53 2018 No.1345046 >>1345025 Who are you talking to? Shithead there isn't the guy building a transceiver.

Anonymous Tue Mar 6 23:34:18 2018 No.1345051
File: 13 KB, 236x236, make-me-unsee-it.jpg [View same] [iqdb] [saucenao] [google]

>>1345046
>Shithead there isn't the guy building a transceiver.
>building a transceiver.
>building
I see a kid with dirty mouth, with zero education. Posting nonsense isn't "building a transceiver"

>>	Anonymous Wed Mar 7 04:30:39 2018 No.1345125 >>1344952 I predict a 1-bit digital Tayloe detector is going to detect a lot more noise than signal. anyway, have fun, we'll see you in a couple of months when you have a working prototype, and please stfu until then

>>	Anonymous Wed Mar 7 13:09:46 2018 No.1345282 >>1345125 >what is an ACD/DAC How do you think soundcards work?

>>	Anonymous Wed Mar 7 13:27:44 2018 No.1345286 >>1345282 So, how is this related to that 4 to 1 ECL multiplexer? He'll have a 576MSPS ADC and as many muxes as his ADC has bits? Totally sounds like a $30 design. Sensible, too.

>>	Anonymous Wed Mar 7 13:46:01 2018 No.1345293 >>1345286 In an FGA, a 4:1 mux will only take up a single LUT. That's not problem when even a $7 FPGA has 4k LUTs.

>>	Anonymous Wed Mar 7 15:31:02 2018 No.1345355 DX chasers: 14.237 U. Station out of Hungary coming in clear in 9. 59 report TX 100 watts.

>>	Anonymous Wed Mar 7 18:13:34 2018 No.1345439 >>1345282 how do YOU think capacitors work?

>>	Anonymous Thu Mar 8 09:17:12 2018 No.1345736 >>1345355 I'd suggest you to share your location if you post stuff like that next time.

>>	Anonymous Thu Mar 8 09:18:16 2018 No.1345737 >>1345736 I did. I'm in 9.

Anonymous Thu Mar 8 09:21:33 2018 No.1345740

>>1345439
>how do YOU think capacitors work?
I think we should leave that guy alone. He still has no idea what is a Talyoe mixer & how does it work. All attempts to convince him to spend some time on reading books is pointless. Hell, he even failed to read the short .pdf on SDR he posted.

>>	Anonymous Thu Mar 8 09:22:36 2018 No.1345742 >>1345737 usa?

>>	Anonymous Thu Mar 8 10:36:18 2018 No.1345777 File: 995 KB, 2112x1632, US_Amateur_Callsign_Regions.jpg [View same] [iqdb] [saucenao] [google]

>>	Anonymous Thu Mar 8 10:41:51 2018 No.1345781 File: 180 KB, 1024x621, i-am-number-0.png [View same] [iqdb] [saucenao] [google] >>1345777 Nice to meet you :D Cheers!

>>	Anonymous Thu Mar 8 10:46:07 2018 No.1345786 File: 25 KB, 480x360, hqdefault_5.jpg [View same] [iqdb] [saucenao] [google] Looking for the best prices on a Pi 3 and DVmega boards. My next project is building a MMDVM for DMR, D-Star, P25 and YSF. Will be running Pi-Star.

>>	Anonymous Thu Mar 8 18:58:14 2018 No.1345969 >>1345786 ok

>>	Anonymous Fri Mar 9 01:28:09 2018 No.1346133 Do cell phones use DDC/DUC? It is hard to get any useful technical info on cell phone chip sets.

Anonymous Fri Mar 9 02:15:22 2018 No.1346149

>>1343259
Thank you for the third preview of the FAQ.
>I especially welcome reports of "broken links"
I'd suggest to change the link to the FAQ next time because the one you posted is not a valid URL. Selecting it and right click to go there will not work and may send you to google instead. For the same reason the link in line 103 of the html file (FTP) does not work. The standard syntax is ftp://user:pass@host:port/path_to_file but you can leave off the login part and simply link to ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview3.htm because Max's FTP server permits anonymous reading access and guest=anonymous. Thank you.

>>	Anonymous Fri Mar 9 04:20:21 2018 No.1346183 >>1346133 >Do cell phones use DDC/DUC? It is hard to get any useful technical info on cell phone chip sets. Having an ADC/DAC running at 2x of 2100 MHz is inefficient, I havent' seen any chip set / RR transceiver IC that does that.

>>	Anonymous Fri Mar 9 05:34:40 2018 No.1346201 >>1346133 they generally use a single IF and OFDM modulation afaik. you could check out the OpenBTS project and learn much

Anonymous Fri Mar 9 09:51:51 2018 No.1346299

>>1346149
Thanks for the comments; I'll revise all the links.

>because Max's FTP server
Aha, you know him? There are a few things there that I'd recommend he delete.
>permits anonymous reading access and guest=anonymous.
Is this a new function? And does it give also write access?

Anonymous Fri Mar 9 13:18:19 2018 No.1346382

>>1346299
>you know him?
No, I'm on another side of the globe, it's in the connect message.
>new function?
Standard for ftp servers if so configured. If you connect as guest or anonymous you get a password request but hitting return is enough for login. If you use the http-like syntax (pic) the 'Password:' line doesn't even appear.
>also write access?
Fortunately not, read only. Full access only for owner ftp with a valid password.

>>	Anonymous Fri Mar 9 13:19:30 2018 No.1346383 File: 10 KB, 492x238, ftp_log.png [View same] [iqdb] [saucenao] [google] >>1346382 pic

Anonymous Fri Mar 9 22:27:32 2018 No.1346598

Did my Skywarn country requirement training today, doing my second VE session tomorrow morning, made my first DX contact with Poland yesterday (farthest DX so far), found someone to help me mount the end of my dipole on my roof's peak (can't do heights) and a local club offered me a free year's membership since I have helped them with a lot of things (not a member currently).

Been a neat week, I guess.

>>	Anonymous Sat Mar 10 00:37:09 2018 No.1346647 I'm almost certain the answer is no, but is a man portable 40 meter antenna for QRP usage with more gain than a dipole practical?

>>	Anonymous Sat Mar 10 02:52:44 2018 No.1346692 >>1346647 >s a man portable 40 meter antenna for QRP usage with more gain than a dipole like what? Yagi?

>>	Anonymous Sat Mar 10 03:32:35 2018 No.1346704 >>1346692 >20m wide directional antenna I like where this is going.

>>	Anonymous Sat Mar 10 04:31:07 2018 No.1346715 File: 88 KB, 679x300, 18m-mast.jpg [View same] [iqdb] [saucenao] [google] >>1346704 2el wire yagi + two fiber glass masts = portable antenna

Anonymous Sat Mar 10 07:11:48 2018 No.1346744
File: 106 KB, 1024x679, yagi.jpg [View same] [iqdb] [saucenao] [google]

>>1346715
Yeah but firstly the reflectors and directors have to be pretty large and the brace which holds them is often at least twice the length of the dipole, so 40m. Secondly it has to be pointed somewhere other than upwards, so positioning will likely require a setup of supporting lines, and altering the angle at which the antenna points at is equally difficult. It might actually be easier to make with a vertically polarised antenna instead of a horizontal one as you can just have a selection of vertical masts in a row, one of which is electrically split in the middle with some coax running up to it off another half-height mast to make the dipole. That is, if the signals you're wanting to transmit or receive should be vertically polarised.

>>	Anonymous Sat Mar 10 07:31:01 2018 No.1346751 File: 25 KB, 400x346, 2el-wire-yagi.jpg [View same] [iqdb] [saucenao] [google] >>1346744

>>	Anonymous Sat Mar 10 07:38:39 2018 No.1346755 >>1346751 But that's diagonally polarised, and only has a single reflector(?), not sure about the wonky 2.2/7.5 arrangement, it probably make sense somehow. You probably can't make an oblique Yagi (longer than wide) using that method.

Anonymous Sat Mar 10 08:28:41 2018 No.1346771

>>1346755
>But that's diagonally polarised,
yes, not a big for HF
>>1346755
>only has a single reflector(?),
should be director
>>1346755
>not sure about the wonky 2.2/7.5 arrangement
Not my design, found it online. That's supposed to be optimized in MMANA layout
You can do 3 el assymetrical yagi in a similar way.
I personally wouldn't really bother with yagis, something like GP would be just fine.

>>	Anonymous Sat Mar 10 08:36:15 2018 No.1346774 File: 151 KB, 800x554, vk_map.jpg [View same] [iqdb] [saucenao] [google] >>1345777 Have a VK map.

>>	Anonymous Sat Mar 10 08:45:24 2018 No.1346775 >>1346774 Why VK1 region is that tiny? Also what kind of transceiver/antennas do you have?

>>	Anonymous Sat Mar 10 10:29:43 2018 No.1346795 >>1346775 >ACT is the capitol area, much like the City of London and Washington DC are sort of their own "states"

>>	Anonymous Sat Mar 10 10:36:51 2018 No.1346798 File: 35 KB, 393x799, van-mount_vertical.jpg [View same] [iqdb] [saucenao] [google] >>1346771 >something like GP

>>	Anonymous Sat Mar 10 10:40:17 2018 No.1346799 >tfw /AE >tfw no HF

>>	Anonymous Sat Mar 10 10:54:22 2018 No.1346800 File: 51 KB, 1200x750, 1501618542394.png [View same] [iqdb] [saucenao] [google] >>1346799 >tfw no tfw

>>	Anonymous Sat Mar 10 11:09:39 2018 No.1346802 >>1346799 Try Remotehams .com

>>	Anonymous Sat Mar 10 12:17:44 2018 No.1346819 File: 2.32 MB, 3072x2304, Wull.jpg [View same] [iqdb] [saucenao] [google] >>1346704 >>20m wide directional antenna >I like where this is going. You have a most excellent taste, anon.

Anonymous Sat Mar 10 14:29:16 2018 No.1346859
File: 3.72 MB, 2463x1759, Gakona.jpg [View same] [iqdb] [saucenao] [google]

>>1346819
Gablingen is RX only, 1.5 .. 30 MHz, up to 5000 km.
Gakona is TX only, 2.7..10 Mhz, max ERP 5.1 GW, or 97.1 dBW. AM, CW, FMCW. Commonly used frequencies 2750 kHz, 3200 kHz, 3250 kHz, 4450 kHz, 5600 kHz, 5800 kHz, 6000 kHz, 6600 kHz, 6800 kHz. Ten years ago the facility was used for a spectacular 7 MHz EME experiment: https://www.google.com/search?q=haarp+moon+bounce+experiment

Anonymous Sat Mar 10 16:23:55 2018 No.1346909
File: 201 KB, 656x530, cw-key-hk8-morseexpress.jpg [View same] [iqdb] [saucenao] [google]

Fun about Morse code in general and in military signal service in particular:
https://www.tek.no/artikler/retro_serieteknologi_telegrafi/22199/alle
If you are not Scandinavian you might want to feed that into Google Translate.

>>	Anonymous Sat Mar 10 16:24:29 2018 No.1346910 >>1346775 >Also what kind of transceiver/antennas do you have? Just a swl at this point. Have toyed with idea of getting licensed but not sure I'm cut out for talking much. Can pass the full call practice exams online.

>>	Anonymous Sat Mar 10 17:04:00 2018 No.1346924 >>1346910 there are terse digital modes, if bouncing a dozen or so characters off meteors or the Moon appeals to you there are also packet modes and good old RTTY

>>	Anonymous Sat Mar 10 18:07:10 2018 No.1346959 File: 285 KB, 2148x1020, key.jpg [View same] [iqdb] [saucenao] [google] >>1346909 >Fun about Morse code I made me a morse practice key. Next comes a pixie or a frog or a rock-mite and then a 40m antenna, indoor...

>>	Anonymous Sat Mar 10 19:04:07 2018 No.1346983 >>1346924 I'm the guy who usually tells the others that lol.

Anonymous Sat Mar 10 19:45:04 2018 No.1347001

The radio FAQ is updated to preview 3:

ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview4.htm

Main addition is learning Morse code. Also FTP address is corrected, much thanks for the input. Some behind-the-scenes formatting cleanup means size is about the same as precious version.

>>	Anonymous Sat Mar 10 20:24:41 2018 No.1347021 >>1346910 What antenna / receiver? Are you able to copy Jap & Korea hams?

Anonymous Sun Mar 11 01:02:21 2018 No.1347104
File: 10 KB, 512x384, knot-dipole.jpg [View same] [iqdb] [saucenao] [google]

>>1347001
>updated to preview 3
It's even #4 and access is working flawlessly now. Thank you for maintaining the FAQ, it's the place to send "why ham?" people to. I'd suggest to add https://en.wikipedia.org/wiki/Morse_code to the Morse code section, very exhaustive. (Minor typo: 'Signbal' in line 253 should probably read Signal I guess..)

Anonymous Sun Mar 11 03:02:53 2018 No.1347122

>>1346647
build a phased array of squid pole verticals

>>1346910
get licence, go digital modes

and don't buy a house with no fucking tall trees like i did, i'm now eyeing cheap flagpoles on ebay as potential masts to hang a dipole because i don't want to spend a fortune on a tower...

Anonymous Sun Mar 11 03:05:06 2018 No.1347124
File: 33 KB, 400x333, vintage-nova-tech-pilot-pal-3-transistor-radio_1_997e7b1030881adf011ffe7fccda5698.jpg [View same] [iqdb] [saucenao] [google]

>>1347021
I mostly listen to VHF on an old radioshack scanner.

I do listen on an old panosonic domestic radio with shortwave sometimes but only to the AM guys. Have an old Helicrafters S120 I found on a junk throw out but it has to run on 110 volts plus it drifts pretty bad / warbles with AC hum on SSB. I listen to 160 on pic related. Have a rtlsdr.

Also listen to websdrs.

Had a random long wire but that broke not long back and have not fixed it yet. Used to have a /diy/ discone up but its been in the shed for years since CB antennas went up on the same pole. I mostly listen to that rather than actually speak.

Not sure I've heard japs but I have heard loads of asian pirates "shit posting" on the bottom end of 40 metres.

>>	Anonymous Sun Mar 11 03:07:17 2018 No.1347125 >>1347122 >build a phased array of squid pole verticals You can have a direction antenna made of few IV (active / passive) antennas

>>	Anonymous Sun Mar 11 03:07:41 2018 No.1347126 >>1347124 Also I posted the shitposters from 40 on /int/ once and asean thought they were Indonesians.

>>	Anonymous Sun Mar 11 03:09:17 2018 No.1347127 >>1347122 >and don't buy a house with no fucking tall trees like i did, i'm now eyeing cheap flagpoles on ebay as potential masts to hang a dipole because i don't want to spend a fortune on a tower... B-but building a mast yourself is easy and cheap

>>	Anonymous Sun Mar 11 03:15:55 2018 No.1347130 >>1347127 easier and cheaper than buying a 6-7m long aluminium pole that comes with a pulley on the top for like $50 AUD ? things are so cheap i think i'm gonna throw down the shekels for one just to see if it's viable or not

Anonymous Sun Mar 11 03:23:50 2018 No.1347132

>>1347122
>because i don't want to spend a fortune on a tower...
https://translate.google.com/translate?sl=ru&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u=http%3A%2F%2Fwww.cqham.ru%2Fforum%2Fshowthread.php%3F31253-%25D2%25E5%25EB%25E5%25F1%25EA%25EE%25EF%25E8%25F7%25E5%25F1%25EA%25E0%25FF-%25EC%25E0%25F7%25F2%25E0-RW9HTB&edit-text=

According to the author the cost was like $300, that was either Belarus or Russia, back in was 2014

>>	Anonymous Sun Mar 11 03:31:36 2018 No.1347133 >>1347130 With 6-7 m mast you'll end up with an NVIS antenna, it sucks for DX Go with 2-3 times than that, like 15-20 meters

>>	Anonymous Sun Mar 11 04:08:18 2018 No.1347144 >>1347133 Only plausible outside suburbia.

Anonymous Sun Mar 11 04:37:48 2018 No.1347151

>>1347133
Above 8 metres I need a building permit, which is a whole new world of pain and expense

Been looking at terminated folded dipoles and from what I've read they'll do ok even at 5m up so should be decent for babby's first home HF station. Even if NVIS is all I get that's fine, can add a vertical later for DX

>>1347144
>tfw no large acreage to plant antennas like >>1346819

>>	Anonymous Sun Mar 11 06:57:16 2018 No.1347194 >>1347124 I see. Then here is no chance that you will ever copy me

Anonymous Sun Mar 11 08:44:38 2018 No.1347218

>>1347104
>It's even #4
Yeah, I was a bit tired.
>and access is working flawlessly now.
Phew
>Thank you for maintaining the FAQ, it's the place to send "why ham?" people to.
Much appreciated. The more I look around the net the clearer it is that much of the important starting points are locked behind pay walls. I question ARRL's wisdom here.
>I'd suggest to add https://en.wikipedia.org/wiki/Morse_code to the Morse code section, very exhaustive.
Done. I also liked to the article mentioned above though Google Translate did a really bad job of the translation.
>(Minor typo: 'Signbal' in line 253 should probably read Signal I guess..)
Fixed.

So now Preview 5 is published.

I am considering adding a new tech chapter with
- band plans and uses
- receiver and transmitter tech
- modulations and coding
- more?

Wikipedia has a lot but also has a policy of not being made for studying, and I want this FAQ to be a one stop document to get started.

>>	Anonymous Sun Mar 11 09:09:38 2018 No.1347223 >>1347218 Do it if you will but I don't know how read stickies are unless they are tl;dr friendly.

Anonymous Sun Mar 11 10:47:43 2018 No.1347253

>>1347223
Good point. I want it to be condensed and to the point. Perhaps a secondary document?

A lot about the interest in radio is about listening and discovering traffic, and people wonder what is out there, who is using the bands. Using websdr without knowing modulation types is hard. And even with websdr there are still much traffic that just sounds like warbling, like ALE.

Anonymous Sun Mar 11 17:16:15 2018 No.1347449

>>1347253
I learnt an awfull lot by listening and seeing rather than reading. I have not really understood ssb till I saw waterfall displays and watched sounds. It's all on Wikipedia with formulas and all that but seeing it represented graphically makes it so much clearer. There is some guy who has a chiming clock and you can see the notes as different frequencies each side of his carrier on AM.

Anonymous Sun Mar 11 18:53:58 2018 No.1347514
File: 7 KB, 142x183, morse-hi.jpg [View same] [iqdb] [saucenao] [google]

>>1347218
>Google Translate did a really bad job of the translation.

no: * mellomrom mellom tegn i et ord er 3 enheter lang
en: * my heart is full of myths and myths 3 enheter lang

What a poetic translation. Samuel Morse was an artist after all and hi=lol.

The reason is that your translation link (military culture) rests on sl=auto which in this case fails and detects Albanian as the source language rather than Norwegian. Just replace the href in line 280 with

https://translate.google.com/translate?sl=no&tl=en&u=https%3A%2F%2Fwww.tek.no%2Fartikler%2Fretro_serieteknologi_telegrafi%2F22199%2Falle

and see what happens. I got a clean English translation, no more heart full of myths but 'spaces between characters in a word are 3 units long', as it should be. Thank you for the good work.

Anonymous Sun Mar 11 19:05:28 2018 No.1347517

>>1347514
>and see what happens
Still a few poetic lines remaining:
no:Verdens raskeste telegrafist var Ted R. McElroy som greide over 70 speed i 5 minutter i 1939.
en:The world's fastest telegraphist was Ted R. McElroy who stepped over 70 speed in 5 minutes in 1939.

"stepped over" should be "exceeded", and there are more gems throughout the article. Still, I hope it conveys something reasonably close to the original meaning.

I noticed a link to a PDF, seems worth reading (I am saving a copy)
https://web.archive.org/web/20150802194750/http://break.org/gisle/HamRadio/binaries/TASRT.pdf

>>	Anonymous Sun Mar 11 20:16:25 2018 No.1347553 >>1347517 >In the past, there have been more contests between handsome youth by SMS, and the older guard armed with mother keys. (C) google translate

>>	Anonymous Sun Mar 11 20:37:24 2018 No.1347562 really wish we had flags on here. would be nice to make some contacts in lands far away. any of you guys do QSL cards? looking for a cheap way to do it, dont think my printer is up to the job.

Anonymous Sun Mar 11 20:43:26 2018 No.1347564
File: 110 KB, 1000x1000, k.jpg [View same] [iqdb] [saucenao] [google]

>>1347562
I just buy Avery Brand printable postcards and have a simple design on the front I made in Paint.net with my callsign, A star on my location on a map of my State, my club's logo along with my Skywarn and RACES affiliations.

The back is just simple black and white.

What I do as a specialty touch which started because my friend's joked I was "Stuck in World War One" instead of using the internet, was to have a custom wax seal stamp with my callsign and outline of the state made for $15 on Amazon and seal the envelopes with the seal.

The other hams get a kick out of that.

>>	Anonymous Sun Mar 11 21:26:33 2018 No.1347578 best study material for tech exam?

Anonymous Sun Mar 11 21:30:36 2018 No.1347580

>>1347578
I took the practice exams at aa9pw.com until I could pass Tech and General (You really should go for general and take it for free right after you pass tech, it gives privileges on the good HF bands for global communications).

aa9 is set up like the real ARRL exams so it's the best free one I know.

>>	Anonymous Sun Mar 11 22:49:29 2018 No.1347610 Good external tuner for 80 and 60 meters? My TS-590SG tunes everything with the internal on my G5RV to almost always 1:1 but it gives me the SWR alert on 80 and 60 and doesn't even try to tune them. The cheaper and smaller, the better.

>>	Anonymous Sun Mar 11 23:07:59 2018 No.1347618 >>1347610 >The cheaper and smaller, the better. Build one yourself, they are stupidly simple things to build.

>>	Anonymous Mon Mar 12 03:06:58 2018 No.1347725 >>1347553 Haha, poetry still remains. Just checked, 3 Nobel Prizes in literature isn't too shabby for a country that small. Google Translate was probably inspired.

Anonymous Mon Mar 12 07:41:01 2018 No.1347788
File: 8 KB, 300x300, keyboard2.jpg [View same] [iqdb] [saucenao] [google]

>>1347725
That is all marginal compared to Alieexpress Chinese to English. You can find elements of comedy in any machine-translated non-trivial text. Translate the page to French and German and discover that 'morse' can have another meaning in Norwegian. Machines are not that context aware (yet).

>>	Anonymous Mon Mar 12 07:41:35 2018 No.1347789 What digital mode would this be? https://vocaroo.com/i/s1cFHvrQnfsm

>>	Anonymous Mon Mar 12 08:14:15 2018 No.1347801 >>1347789 What frequency was that?

>>	Anonymous Mon Mar 12 10:59:06 2018 No.1347867 >>1347789 It sounds like FT8 but is slower, dwelling on each tone a bit longer. Hmmm. I am guessing JT65. Tone is a little off but that might as well be a frequency offset in the receiver.

>>	Anonymous Mon Mar 12 11:08:18 2018 No.1347870 >>1347789 Some type of MFSK comm. IFKP, perhaps? It could also be another protocol that was recorded off frequency. http://www.qsl.net/zl1bpu/MFSK/

>>	Anonymous Mon Mar 12 14:03:35 2018 No.1347921 >>1347789 >>1347867 >>1347870 Samples here: https://www.sigidwiki.com/wiki/JT65 Match?

Anonymous Mon Mar 12 15:39:23 2018 No.1347961
File: 346 KB, 1536x864, 1498342795614.jpg [View same] [iqdb] [saucenao] [google]

yay I just got the sea cucumbers I ordered a couple of weeks ago

>>1347867
there are definitely 8 distinct tones in the spectrogram, centered on 500Hz (modulo tuning). I didn't see a 9th tone

>>	Anonymous Mon Mar 12 16:29:39 2018 No.1347987 >>1347801 Can't remember exact but it was on 160 in CW mode.

>>	Anonymous Mon Mar 12 17:24:35 2018 No.1348021 >>1347578 Hamstudy.org

>>	Anonymous Mon Mar 12 17:26:05 2018 No.1348022 >>1347578 Also watch ameteur logic ham college. It's pretty entertaining and more of a morale boost than education.

>>	Anonymous Mon Mar 12 19:34:02 2018 No.1348098 What does "Thank you for the flowers" mean? I'm listening to a net on 7185 right now on my SDR while I study for my Tech and General.

>>	Anonymous Mon Mar 12 19:59:10 2018 No.1348112 >>1348098 well, you cant conceal any messages on amateur radio. so...maybe old men are sending each other flowers? lol i wish i could listen but a storm took my antennas out.

>>	Anonymous Mon Mar 12 21:08:18 2018 No.1348141 >>1348098 probly figurative, tnx fer laud

>>	Anonymous Mon Mar 12 21:24:25 2018 No.1348148 >>1348112 >>1348141 Okay I listened for a bit longer. It appears that's their joking way to say "Thanks for the signal report."

>>	Anonymous Mon Mar 12 21:30:49 2018 No.1348150 >>1348098 To say someone was "deflowered" means they had their virginity taken. You simply overheard one old man thank another for letting him take the other's anal virginity.

Anonymous Mon Mar 12 22:02:22 2018 No.1348167
File: 55 KB, 253x235, 1518889846765.png [View same] [iqdb] [saucenao] [google]

>>1347961
where did you get those from anon? i need a bunch. my one speaker has a terrible tick on it. sounds like the woodpecker.
>>1348148
yeah, theyre probably just messing around.
>>1348150

>>	Anonymous Mon Mar 12 22:35:30 2018 No.1348172 >>1348148 particularly, a flattering signal report >>1348167 just one of many sellers https://www.aliexpress.com/item/Brand-New-High-Quality-Ready-To-Eat-Sea-Cucumber-10Pcs-Black-Cable-Wire-Clamp-Clip-RFI-EMI-EMC-Noise-Filters-Ferrite/32627776378.html

>>	Anonymous Mon Mar 12 22:41:46 2018 No.1348174 >>1348172 holy shit thats cheap. i was looking at 20 for 10 USD. they work? never used ali

>>	Anonymous Mon Mar 12 22:46:05 2018 No.1348176 >>1348098 Could be local speak. One group around here who started as pirates way back when have some rather unique language. Its no secret if you listen long enough.

Anonymous Mon Mar 12 22:53:50 2018 No.1348179

>>1348176
Might be, it was the "Old Miss" net. They seem to have their own jargon.

I'm going to my first Skywarn meeting Wednesday. Is it going to be full of the gung-ho weenies who wear reflective vests and EMS/Public Safety gear with huge mag mount stickers and are trying to make up for failing the Academy entrance exam?

>>	Anonymous Mon Mar 12 23:13:02 2018 No.1348186 >>1348174 not sure, haven't had time yet to seriously gear up to find the birdies. also the ones that are big enough to fit around my video cabling haven't gotten here yet

>>	Anonymous Mon Mar 12 23:44:09 2018 No.1348201 >>1348186 ah. i need ones for rg8 and 213. the lmr 400 seems to have no issues

>>	Anonymous Tue Mar 13 00:22:32 2018 No.1348213 >>1348201 oh, you be looking for these? https://www.aliexpress.com/item/Hot-wholesale-UF100-clamp-EMI-ferrite-core-inner-diameter-10mm-0-39-black-case-for-9/32340331293.html

>>	Anonymous Tue Mar 13 19:18:19 2018 No.1348597 I thought this was the antenna edition.

>>	Anonymous Tue Mar 13 19:20:03 2018 No.1348599 How about a 20/17/15/12/10 meter fan inverted vee on a spiderbeam 40 ft pushup pole?

>>	Anonymous Tue Mar 13 19:35:35 2018 No.1348611 >>1348597 >I thought this was the antenna edition. ask your q's

>>	Anonymous Tue Mar 13 20:17:18 2018 No.1348639 File: 28 KB, 720x550, sunspot201803condx.gif [View same] [iqdb] [saucenao] [google] >>1348599 >20/17/15/12/10 meter maybe in a five years

>>	Anonymous Tue Mar 13 20:37:14 2018 No.1348652 >>1348639 I wanna stretch out a 40 meter dipole, but is 40 ft sufficient height?

>>	Anonymous Tue Mar 13 20:56:36 2018 No.1348682 >>1348652 should be ok. my 80/40/20 got knocked out a few weeks ago and its on the ground and stuck in some trees, and i can still hear a lot. doubt i could tx though.

>>	Anonymous Tue Mar 13 23:30:45 2018 No.1348802 >>1348652 Yeah you'll get decent performance

>>	Anonymous Tue Mar 13 23:52:16 2018 No.1348810 >>1348639 I've always idly wondered... after the norks send up an EMP blast, will the surviving people and equipment find better propagation on shorter bands?

>>	Anonymous Tue Mar 13 23:58:00 2018 No.1348814 >>1348810 even if they don't, the reduced noise should help a lot

>>	Anonymous Wed Mar 14 10:54:42 2018 No.1349027 >>1348810 1962. no norks, it was the burgers and the vodkas https://www.google.com/search?q=high+altitude+nuclear+explosion The real thing would be the Sun sneezing in our direction https://en.wikipedia.org/wiki/Solar_storm_of_1859

Anonymous Wed Mar 14 13:26:31 2018 No.1349124

What do people speak about on CW? Or it is used for QSOs only?
I mean, how is CW-shitposting?
Also I have a question about FAQ. There's sentence:
>And make no mistake, you will be found. And recorded, voice prints archived for future use.
but
>A properly trained military Morse code operator will know how to transmit to the target without being caught by enemy intelligence
So, are Morse code operators caught or not?
I guess, uncatchable one must have 5 years of military education?

Anonymous Wed Mar 14 13:35:03 2018 No.1349137

Hello /HR/, just purchased a baofeng UV-5R since they were a steal on amazon (discontinued, $25 now), and would like to learn the technical terms relating to the radio and how it works. I plan to use this radio as a scanner and walkie talkie in the future if I get another one of these. I’m looking for sources and info that explain this simply, the FCC is kind of hard to understand right now. If it helps, I live in Texas.

Anonymous Wed Mar 14 13:41:11 2018 No.1349149

>>1349137
>and walkie talkie
It is illegal to use a UV-5R as a "walkie-talkie" if you're unlicensed. You can use it on the FRS/GMRS frequencies if you get an FCC permit/FRN ($70) or if you get your Technician class license ($15 and really easy), you can use it for Simplex (radio-to-radio) operations on the Amateur frequencies with another licensed Ham.

>>	Anonymous Wed Mar 14 14:12:42 2018 No.1349177 >>1349137 its pretty shit if youre going to use it as a scanner. it scans really slow. if youre interested in scanning around i would suggest a uniden BC125AT, nice and portable. id also get an external antenna, or make one

>>	Anonymous Wed Mar 14 15:27:03 2018 No.1349215 >>1349027 so, in the event of EMP, auroral propagation would be 100% laughcry oksign. cool

>>	Save Icon Wed Mar 14 15:39:21 2018 No.1349222 >>1349124 do you really think that some operator's hunch is effective evidence? don't worry about it. you'd have to be an actual spy to get any sort of government attention

Anonymous Wed Mar 14 15:57:58 2018 No.1349231
File: 16 KB, 200x303, doubt.jpg [View same] [iqdb] [saucenao] [google]

>>1343155
>FAQ: ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ_Preview2.htm
>all bands are monitored and emitters located as a matter of routine
>Above 30 MHz you will be caught by satellite systems like Mercury, Vortex and more.
Considering direction finding is only accurate to about a degree, I'm having trouble believing that they would waste their time with this. Even if they managed accuracy to 1/2 degree they'd still only be narrowing down your location to somewhere within ~200 miles of your actual location given how far satellites are from Earth's surface, which is going to be many times the distance you would actually be able to normally communicate using those frequencies.

On a side note.
>Below 30 MHz you will be caught by systems like the Wullenweber, huge antenna systems that at 300 m diameter have earned the nickname "Elephant cages".
I'd be much more worried about what could be done with a cheap SDR and modern hard drive capacity on home computers than what the government can do with a fuckheug antenna. Also, there doesn't seem to be much work as of recently with using FLAC or other compressed formats for recordings done with SDRs, so people's ability to record large chunks of spectrum could increase significantly in the near future.

Save Icon Wed Mar 14 16:02:27 2018 No.1349232

>>1349231
>there doesn't seem to be much work as of recently with using FLAC or other compressed formats for recordings done with SDRs
If you mean compressing the raw data from the SDR, the size reduction would be small because a lot of the recorded spectrum would be high-entropy noise.

>>	Anonymous Wed Mar 14 16:09:39 2018 No.1349235 >>1349222 My main question was about CW anyway. And, maybe, about RTTY to some extent.

>>	Anonymous Wed Mar 14 16:16:09 2018 No.1349237 >>1349177 When you say that it scans really slow, do you mean that there is a time lag from when the trasmitted message is put out til’ the time you receive said message?

Anonymous Wed Mar 14 18:07:48 2018 No.1349325

>>1349149
>You can use it on the FRS/GMRS frequencies
carefully. some freqs have a power limit

>>1349231
>implying governments can't buy huge hard drives
also, should you use the same transmitter for shitposting and non-shitposting purposes, its key-up and key-down transients can be analyzed and compared

Anonymous Wed Mar 14 18:26:02 2018 No.1349348

>>1349325
>>implying governments can't buy huge hard drives
But the government doesn't put shit online for all to see. Can you imagine if all those webSDR sites added the ability to look back a day or more in the near future as the cost of hard drives/bandwidth goes down, or the possibility of someone using speech to text software with an SDR and a decently powerful computer to demodulate any phone mode transmissions and make publicly accessible and searchable transcripts of all QSOs because they're archivefags? Do you know how shitty that would be with how much people some people freak out about other people not having the same views as them?

>>	Anonymous Wed Mar 14 18:40:02 2018 No.1349364 >>1349348 you shouldn't say anything on ham radio that you wouldn't be proud to have attributed to you in tomorrow's newspaper. if all you want to do is be proud of which oligarchs' cock you suck, stick to anonymous nepalese yak calling boards

Anonymous Wed Mar 14 19:09:08 2018 No.1349387

>>1349348
>the ability to look back a day or more
You could do that yourself with amazon/your own servers, just by connecting to a series of SDRs across the country. Heck, you could even triangulate them with 3+ receivers to figure out where each signal is being transmitted from and make a historic radio map. Sounds like a fun project for someone with a few TB free and a fast connection. If you store it all as audio/binary files on specific frequencies you could probably make it pretty compact, compared to a .wav or whatever with so many GHz of bandwidth.

Save Icon Wed Mar 14 20:33:17 2018 No.1349425

>>1349235
In the theoretical scenario that you are being monitored by a capable agent, your transmitter could be enough to identify you.
See: https://s3-us-west-2.amazonaws.com/belllabs-microsite-mbuddhikot/psdocs/cogfemto/VTC%20Falls%202008.pdf
However, you must consider they likelihood of this level of surveillance and the admissibility of the evidence in a court.

Anonymous Thu Mar 15 06:57:28 2018 No.1349695
File: 33 KB, 283x576, MURS-V1.jpg [View same] [iqdb] [saucenao] [google]

>>1349137
Both MURS (VHF) and FRS (UHF) are license free and open to operation by minors. If the transmitter is certified by the FCC, that is. This means pushing the PTT on your UV-5R makes you a PIC candidate. If you want to fly under the radar at least program your toy(s) accordingly. Educate yourself here:
https://www.fcc.gov/wireless/bureau-divisions/mobility-division/multi-use-radio-service-murs
https://www.fcc.gov/wireless/bureau-divisions/mobility-division/family-radio-service-frs

Anonymous Thu Mar 15 10:20:09 2018 No.1349766

I am interested in getting into radios, should I go to my local ARRL meeting or just learn everything I can from the internet?
My uncle had a nice ham setup, but his kids sold it off once he died. I remember him shitposting with fags from all over the world when I was a kid.
I am more interested than anything in having the capability to communicate once the internet goes away.
I would be starting with some baofeng shit but am definitely interested in /diy/ aspects like antennae dynamics.

Anonymous Thu Mar 15 10:46:34 2018 No.1349773

>>1349766
Hit up a club meeting. Google [City] Amateur Radio Club. Most clubs meet once a month except in the summer. Some Elmer there will likely let you come by and see his HF set up and antenna farm.

Make sure you get your General ticket if you want to use the freqs that work for global comms.

Anonymous Thu Mar 15 10:50:13 2018 No.1349775

>>1349237
no. when you put in a bunch of frequencies and hit scan it takes a while to scan through them. so the more frequencies you have, the longer it takes to go throughthem. this is the case with all scanners, but the uv-5r is exceptionally slow.
i would download CHIRP to program your radio as well. makes things a lot easier.
>>1349695
i think MURS/FRS you can only use 500mw? nobody is gonna care that youre pushing 1w.
>>1349766
find out what your local club is. but plenty of info is on the web. i would do both. im sure youll find people to help you out at meetings, and they might even give you some old equipment to play around with once you get your ticket?

>>	Anonymous Thu Mar 15 12:06:54 2018 No.1349816 >>1349775 >can only use 500mw? MURS has 5 channels in the 151/154 MHz range, max 2 W "transmitter power output". FRS has 22 channels in the 462 MHz (2 W ERP) and 467 MHz (0.5 W ERP) range, all of which are shared with GMRS.

Anonymous Thu Mar 15 12:24:05 2018 No.1349822

>>1349816
interesting. ive never used them. although sometimes i monitor them when i take road trips. i know that they have repeaters for one of them where i take trips to. its mostly little kids having nets, it was pretty cute to listen to. i hardly ever hear adults talking on there, except in the background coaching them on proper use of the repeater.

>>	Anonymous Thu Mar 15 15:04:45 2018 No.1349928 >>1349822 That's funny. GMRS repeaters require a license and have a call sign while typical FRS radios cannot access the repater input frequencies. Clever kids..

Anonymous Thu Mar 15 15:43:54 2018 No.1349956

>>1349695
From what i got from the links, you don’t need a license to transmit on murs and the other one, but your radio has to be FFC certified. I read that it is and it’s not on amazon questions, some say that it’s missing the FFC ID or something. On those links, they gave a list of channels you could use unlicensed, so those are the ones I assume I can use to “walkie talkie”?. What is a PIC candidate? I’ve seen some videos that show how to program this so I can receive from important frequencies/ channels without the option to transmit, but theoretically, how much trouble would I be if I programmed it wrong and I accidently transmit? How can I test that I truly disabled transmit for that channel?

Anonymous Thu Mar 15 16:23:24 2018 No.1349971
File: 42 KB, 800x531, lightning-West-Austin-Antenna-Farm-360bridge-cvsherman-8140-L.jpg [View same] [iqdb] [saucenao] [google]

>>1349928
oh, they were using call signs. i mean, like maybe 8-10 years old or something. maybe even younger. im sure their dads were hams, and set the repeaters up because the ham tests are a little far off for them for now. it was pretty funny to listen to. gave me hope after listening to 7200

>>	Anonymous Thu Mar 15 16:34:24 2018 No.1349975 >>1349971 in the US, the only age limit in amateur radio is for VEs who must be 18 or older sounds like someone's dad is being a little bit naughty by setting up repeaters where they shouldn't?

Anonymous Thu Mar 15 16:48:51 2018 No.1349985

>>1349956
>a PIC candidate?
Prison Industrial Complex :/ Nolite te bastardes carborundorum.
https://www.hfunderground.com/wiki/MURS
".. the effective lack of FCC enforcement makes setting up and operating these systems quite attractive." As long as you cause no trouble no one will knock on your door. Just use the license-free channels. Be careful with repeaters because many will hear you.

>>	Anonymous Thu Mar 15 16:54:35 2018 No.1349991 >>1349975 i cant remember if it was GMRS or FRS. i could hear the dads in the background helping them out. there were like 5 kids talking one night, having a little kids net.

>>	Anonymous Thu Mar 15 17:31:35 2018 No.1350012 >>1349971 Have heard a 7yo ham in my country and a few other under 10s who are licensed. I looked them up on the gov database and they were licensed.

Anonymous Thu Mar 15 17:42:15 2018 No.1350020

>>1349956
>How can I test that I truly disabled transmit for that channel?
a dummy load and a power meter, if you want to be really truly sure
alternately, a 16dB attenuator between antenna and radio, transmitting on low power mode, and listening on another receiver
alternately, find a nearby repeater that has an online audio feed, temporarily configure a memory for the input freq with transmit locked (duplex=off in CHIRP), and then key up for a second or two. either listen online for your transmission or observe that the Tx lights don't come on
(not exactly super considerate, but gives you plausible deniability in case you fuck up, and doesn't give anyone enough time to roll the DF vans. it is extremely unlikely that They would spend any effort to hunt you down for a single mistransmission unless you were interfering with corporate rights or They already wanted you for some other reason)

Anonymous Thu Mar 15 17:57:10 2018 No.1350026

There's this daily net that meets on 7.220 this time of day. It's a bunch of wheezed old men who get together to chat about their meals for the day.

I actually think it's kind of charming and a rare notion of an innocent thing in this world. I cannot think of anything more harmless and innocent other than a baby kitten.

I listen, but never join in.

>>	Anonymous Thu Mar 15 18:01:14 2018 No.1350030 >>1350012 im american. our kids arent very bright here. they dont teach us any useful information here in school when were young. im just lucky i had family members that were into radio and fixing/building stuff in general.

>>	Anonymous Thu Mar 15 19:14:45 2018 No.1350076 File: 42 KB, 600x386, DL2JJ-QSL.jpg [View same] [iqdb] [saucenao] [google] >>1350030 The JJ family: She did class E at 10 and class A a year later. Her dad is DL8JJ and her mom DL9JJ. It's the environment that motivates. Music and ham radio.

Anonymous Thu Mar 15 19:57:41 2018 No.1350103

>>1350076
and the (public) educational environment in the USA is geared toward creating an ignorant, obedient, self-reproducing working class. thank god I had a dozen aunts and uncles and a couple of good teachers who recognized aptitude and talent despite my shitty socioeconomic stature

Anonymous Thu Mar 15 21:08:42 2018 No.1350137

>>1349985
>>1350020

I think I'm starting to understand this stuff, so I want to check some things with you guys just to be sure. MURS can only be used (legally) if you follow the rules stated in part 95J AND if the radio is FCC certified, meaning that it has a symbol or sticker saying that it is, correct? Do you set up receiving and transmitting frequencies separate? or will they both be the same? say I want to set my radio up to one of the 5 MURS channels, do I have to manually set my transmitting freq to something in that range to also transmit on MURS?

I'm watching this video at the moment, It covers a good amount of info. https://www.youtube.com/watch?v=Bw_WkbsuAZI

Anonymous Fri Mar 16 08:44:36 2018 No.1350350
File: 57 KB, 573x493, concernedcitizen.jpg [View same] [iqdb] [saucenao] [google]

>>1350076
thats pretty awesome. looked them up last night. wish we had more families like that.
>>1350103
oh, absolutely. we are being taught nothing of value. my kids will never be attending public school. i dont need them indoctrinated to communism. the school system here is totally out of control.
>>1350137
i dont kURS, but unless youre dealing with a repeater your going simplex (person to person) and thats on the same channel. whats your end goal? do you have a buddy you want to talk to?
i would just say get your ham ticket. so many more options
also, are you in murica? other countries have different laws im sure.

>>	Anonymous Fri Mar 16 08:50:53 2018 No.1350355 File: 207 KB, 1600x722, IC-7300.jpg [View same] [iqdb] [saucenao] [google] >>1350350 >i dont kURS i dont know much about MURS apparently i cant into typing this morning

>>	Anonymous Fri Mar 16 12:51:29 2018 No.1350488 File: 3 KB, 225x225, no.png [View same] [iqdb] [saucenao] [google] TYT-9800 DO NOT BUY IT! You will regret it, Has busy channel lockout enabled by default. There is no way to disable this. The supposed patch to disable BCL will brick your radio.

>>	Anonymous Fri Mar 16 12:53:57 2018 No.1350490 >>1349816 Allowing FRS users on the GMRS exclusive channels is a mistake by the FCC. Idiotic thing to do. You whink of all the rules they came up with, why the fuck didn't they allow FM on CB?

>>	Anonymous Fri Mar 16 12:54:59 2018 No.1350491 >>1350490 think, lol!

Anonymous Fri Mar 16 14:10:34 2018 No.1350550

>>1350350
Multi use radio, going to set it up to scan and not transmit on important freqs, and set up on murs channels for when I get another radio to connect to. Thinking about getting the $15 license but I need to see just how far i'm going to take this hobby first.

Anonymous Fri Mar 16 14:32:09 2018 No.1350571

>>1350490
>Allowing FRS users on the GMRS exclusive channels is a mistake by the FCC.
This choice was made because the vast majority of the people using the GMRS exclusive channels weren't licensed and the FCC would no longer be able to actually enforce those rules. The FCC's recent rule changes with regards to FRS and GMRS were expanding FRS to cover all of the features of the FRS/GMRS blister pack radios that everyone abused along with banning radios from covering both GMRS and the new FRS standard to keep the situation from ever happening again.

>why the fuck didn't they allow FM on CB?
This would be fucking stupid because it would break compatibility with 60 years worth of equipment. The only significant change the FCC has made for CB radio that would result in lack of full compatibility with older equipment previously was when they expanded the number of channels from 23 to 40 in the late 70s. Also, MURS radios can use an external antenna so if you want a higher power unlicensed FM transceiver for your vehicle just use one of those.

>>	Anonymous Fri Mar 16 15:47:14 2018 No.1350627 >>1350350 >he thinks bourgeois liberalism is communism go back

Anonymous Fri Mar 16 17:57:29 2018 No.1350719
File: 10 KB, 316x506, bcl_off.png [View same] [iqdb] [saucenao] [google]

>>1350488
That must have been a pre-2015 model and a faulty patch. There are many ways to brick anything. Normally you would use the (free) TYT programming software and the programming cable, which is a usb-rs232 converter, not any usb cable that happens to fit. Just disable BCL and you're done.

>>	Anonymous Sat Mar 17 00:22:25 2018 No.1350877 >>1350571 Why would it be stupid? Europe can use FM but we can't? If they need to switch to AM, most of their radios can. With the shitty power supplies they allow for neon and led signs in the country, FM or a digital format is a must around town.

Anonymous Sat Mar 17 00:34:44 2018 No.1350880
File: 174 KB, 1600x862, tyt_software.png [View same] [iqdb] [saucenao] [google]

>>1350719

Which program is that?

Didn't find anything in CHIRP.

I found this to disable by channel in the 2.0.5 TYT software, but only after the radio was bricked with some other 3rd party software.

Can't find the window you have.

>>	Anonymous Sat Mar 17 09:13:53 2018 No.1351047 How fast did you learn Morse code?

Anonymous Sat Mar 17 11:44:56 2018 No.1351099
File: 151 KB, 310x257, legalise-AM.png [View same] [iqdb] [saucenao] [google]

>>1350877
>Europe can use FM
The CEPT/ECC guideline recommends 40 channels for AM (4W), FM (4W) or SSB (12W PEP) between 26.965 and 27.405 MHz, but some EU countries have different regulations.

In the UK the CB range was originally just below the 10m amateur band (27601.25 to 27991.25 MHz) and FM only, but after a lot of lobbying (image) it now includes The CEPT band.

In DL they have 40 additional channels (41..80) below the CEPT range between 26.565 and 26.955 MHz (4W FM only). Some channels are marked for digital data and others for gateways/relays that can use internet connections. [Source mostly Wikipedia]

>>1350880
That looks like a much older version than yours, but also channel-by-channel. Some hams report that they can use relays 'out of the box', without changing anything or waiting for the relay to drop its carrier. Maybe BCL is off by default now, tryb4ubuy. A bricked device is fubar and can only be used as a brick.

>>1351047
Took me about a year to be fluent and confident enough for the class A examination. You had to key and read 60 symbols per minute for about 5 minutes. This requirement has been dropped now. It is still on offer if you want an extra certificate..

>>	Anonymous Sat Mar 17 13:29:42 2018 No.1351150 >>1351099 >You had to key and read 60 symbols per minute for about 5 minutes. I thought it was 20 symbols?

>>	Anonymous Sat Mar 17 14:22:24 2018 No.1351182 >>1351047 About 4 months. In the military.

>>	Anonymous Sat Mar 17 14:49:56 2018 No.1351207 File: 1.18 MB, 300x188, 1519272687583.gif [View same] [iqdb] [saucenao] [google] >>1351182 I fear to ask how many years ago it was.

>>	Anonymous Sat Mar 17 15:15:27 2018 No.1351217 I have a shitty SDR and want to hear the Buzzer. What antenna can I build that will fit inside my apartment for that? YEah it's a dumb question, fite me.

>>	Anonymous Sat Mar 17 15:17:40 2018 No.1351218 >>1351217 It's tough to listen UVB-76 outside of Russia/Europe (especially in the day). A randomwire as high and as long as you can make it is you best option. If your building is metal, you're pretty much screwed.

>>	Anonymous Sat Mar 17 15:24:01 2018 No.1351219 What DVB tuner should be fine for a newbie for SDR? Or anything goes?

>>	Anonymous Sat Mar 17 15:44:19 2018 No.1351226 >>1351219 RTL-SDR v3.0 is pretty good and cheap. I used it with HDSDR as a panadapter on my Kenwood until I upgrded to an SDRPlay.

>>	Anonymous Sat Mar 17 15:51:37 2018 No.1351230 >>1351226 What do I search on AliExpress?

>>	Anonymous Sat Mar 17 15:52:30 2018 No.1351231 >>1351207 Heh heh. I am not going to tell you. Chances are, however, I am a bit older than the average in here.

>>	Anonymous Sat Mar 17 15:54:53 2018 No.1351232 >>1351230 I bought mine on Amazon.

>>	Anonymous Sat Mar 17 16:06:17 2018 No.1351235 File: 64 KB, 583x670, laura+radio.jpg [View same] [iqdb] [saucenao] [google] Does anyone recognize this radio?

Anonymous Sat Mar 17 16:08:57 2018 No.1351237
File: 92 KB, 404x500, 1519351612398.jpg [View same] [iqdb] [saucenao] [google]

I don't understand frequency modulation. Amplitude modulation, as I understood, changes the voltage of the wave.
But what changes FM? It can't change the frequency of the wave, can it?

>>	Anonymous Sat Mar 17 16:09:54 2018 No.1351238 >>1351237 Oh it can indeed. You can change amplitude, frequency and phase.

>>	Anonymous Sat Mar 17 16:12:24 2018 No.1351240 >>1351235 Yes. https://www.lnrprecision.com/transceivers/ld-5/

>>	Anonymous Sat Mar 17 16:16:00 2018 No.1351241 >>1343608 I've got bad news for you: you have first to buy a good antenna (say, an X510N) and decent cable, later you can think about a cheap rig (say, an UV5R). You will never regret the money you spend on antennas.

>>	Anonymous Sat Mar 17 16:19:30 2018 No.1351244 >>1351240 tnx alot, that's it.

>>	Anonymous Sat Mar 17 16:19:49 2018 No.1351245 File: 301 KB, 1517x803, Begali Spark.jpg [View same] [iqdb] [saucenao] [google] Paddles are for soibois & snowflakes Real men enjoy real keys.

>>	Anonymous Sat Mar 17 16:24:45 2018 No.1351246 >>1351238 I don't understand. Let's have some transimission at 4.054 MHz. How does the wave change frequency and remains at 4.054 MHz?

Anonymous Sat Mar 17 17:18:33 2018 No.1351259

>>1350880
that looks like a second tab under memory channel properties

>>1351245
>telegraphy
>2018

>>1351246
4.054MHz is the center frequency of a channel, which might be 6kHz wide. the transmitter's frequency is varied within the channel according to the voltage of a modulating signal, between 4.051MHz (for max low voltage) and 4.057MHz (for max high voltage). in practice it's undesirable to get too close to those limits
anyway, on the receiving end, the frequency is converted to an ac voltage by (oversimplification) an off-center band pass filter tuned just above the channel upper bound, which is then rectified, which approximates the original modulating signal

Anonymous Sat Mar 17 17:39:38 2018 No.1351271

>>1351259
>anyway, on the receiving end, the frequency is converted to an ac voltage by (oversimplification) an off-center band pass filter tuned just above the channel upper bound, which is then rectified, which approximates the original modulating signal
I understood nothing.
What book should I read?

Anonymous Sat Mar 17 17:39:56 2018 No.1351274
File: 304 KB, 2913x1874, amateur radio modes used.png [View same] [iqdb] [saucenao] [google]

>>1351259
>>telegraphy
>>2018
CW is still the most power efficient way to communicate over long distances that doesn't require a computer and the only choice if you want an extremely efficient mode that doesn't limit you to macro spamming and actually has a large population of users. The vast majority of digital mode activity on HF today has moved to overspecialized modes that are only good for macro spamming and fail the moment you want to send anything other than a preplanned sequence of macros (it's to the point where some contesters have actually written scripts to complete QSOs for them while they're away from their computer and there's talk of banning the usage of newer digital modes from contests). Also, IIRC PSK31 and RTTY achieve similar results to CW for power required to make a contact.

Anonymous Sat Mar 17 18:20:27 2018 No.1351299

>>1351245
Real keys can still be works of art.

>>1351259
>telegraphy
As fellow anon in >>1351274 states, there is still room for CW. It is easy and you can use transceivers the size of a deck of cards. With some skills you can transmit around the world. Try that with a microphone on HF.

Also in adverse conditions CW can burn through a lot of military grade jamming. I have been there.

>>	Anonymous Sat Mar 17 19:03:02 2018 No.1351305 File: 138 KB, 884x678, contesting.jpg [View same] [iqdb] [saucenao] [google] >>1351274

Anonymous Sat Mar 17 19:19:02 2018 No.1351313
File: 14 KB, 600x400, 1516963975693.png [View same] [iqdb] [saucenao] [google]

>>1351271
do you understand how an AM receiver works? a tuned circuit resonates with energy coupled in from an antenna, and the amplitude of the voltage across the tuned circuit is turned into a dc output that follows the amplitude of the signal and therefore approximates the audio signal. this is covered in most explanations of "boy scout" crystal radio sets
in the real world, tuned circuits aren't perfect and they'll still resonate with frequencies either side of the center frequency, to a lesser degree the further away (this is quantified as "quality factor" aka Q). assuming an otherwise clear band (which, in the real world, would be taken care of by additional band pass arrangements ahead of this section), if you tune the circuit's fO to the top end of the FM channel or just above, such that the FM channel falls within the sloped part of the curve around fL on Pic related, the higher the received frequency imposed upon the tuned circuit, the higher the amplitude of the signal on the tuned circuit, and from there you can use a plain old AM detector to get audio
you should probably start with basic ac circuit analysis, or maybe some study material for the FCC technician class ham license will cover it. /ohm/'s OP has some good resources for babby's first electronics

>>	Anonymous Sat Mar 17 21:11:31 2018 No.1351377 File: 28 KB, 372x565, fm-slope-detector.png [View same] [iqdb] [saucenao] [google] >>1351313 Better pictures at https://www.electronics-notes.com/articles/radio/modulation/fm-frequency-demodulation-slope-detector-discriminator.php

>>	Anonymous Sat Mar 17 21:22:02 2018 No.1351385 >>1351313 >dB on a linear scale

Anonymous Sat Mar 17 21:36:18 2018 No.1351393
File: 14 KB, 250x376, pps.jpg [View same] [iqdb] [saucenao] [google]

>>1351245
Sometimes 'real men' can be quite dim bulbs. I'm not a button pusher, I prefer my improvised sideswiper key posted earlier (switches in parallel). Left-right is much more comfortable than up-down because the motion resembles hand-writing. After keying text for half an hour you will notice that. Fortunately CW 'rag chewing' hasn't disappeared from the ether waves.

>>	Anonymous Sat Mar 17 22:24:59 2018 No.1351414 >>1351393 You could probably make a pretty decent one with a single mechanical keyboard switch and a (sideways/upwards) mounting of some kind.

Anonymous Sat Mar 17 22:53:33 2018 No.1351431

>>1351313
>I'm super smart, let me drop a ton of theory, jargon, and math in my cryptic explanation to someone who was already lost on this >>1351271
You are a pretentious dick and terrible at explaining things to people. Although, I don't think you were actually trying to help him understand, rather you wanted to stroke your electronics/radio ego. You should go back to your ham forums and bitch about the no-codes not being real hams.

>>	Anonymous Sat Mar 17 23:06:26 2018 No.1351442 >>1351431 >being this mad about eggheads

Anonymous Sat Mar 17 23:17:02 2018 No.1351449

I was gifted a g5rv antenna when I got my ticket- no class to General- from an Elmer who lives by my grandma. As a poorfag, can anyone suggest an operable barefoot hf set up layout as cheap as possible? I have no problem with used equipment so what's the cheapest used rig out there I should be looking for that isn't just Baofeng/Harbor Freight-quality and will burn out after 10 minutes of TX?

>>	Anonymous Sun Mar 18 00:19:20 2018 No.1351483 >>1351246 >>1351271 https://youtu.be/xn6lzrMJUDs

>>	Anonymous Sun Mar 18 00:23:00 2018 No.1351486 >>1351442 >being this naive about pretentious assholes with superiority complexes

>>	Anonymous Sun Mar 18 01:05:21 2018 No.1351498 >>1351486 >being this mad about egos

>>	Anonymous Sun Mar 18 01:54:44 2018 No.1351509 >>1351483 I like these videos.

Anonymous Sun Mar 18 13:18:30 2018 No.1351796
File: 15 KB, 328x311, switch-lever-switch.jpg [View same] [iqdb] [saucenao] [google]

>>1351414
>with a single mechanical keyboard switch
I used two of them. They are the type of conductive polymer switches you find under the key caps of many 'soft touch' kbs. They don't klick but have a slight microswitch effect which centers and detents the lever. The idea behind this (still experimental) sideswiper key is that both sides equally 'beep' while the pause between the dits and dahs is defined by the displacement and the speed you move it back and forth. Electrically it is a two wire single pole (ON)-OFF-(ON) switch.

Anonymous Sun Mar 18 15:08:07 2018 No.1351871
File: 140 KB, 1166x583, SIGINT_Vortex.jpg [View same] [iqdb] [saucenao] [google]

>>1349231
>Considering direction finding is only accurate to about a degree
The satellites might have worked in pairs and the picture shows substantial overlap. With time of arrival you can get a lot better than one degree.

The new generation Navstar satellites are delayed, I wonder what new features these will get. It is no secret they have added features such as nudet. More might be coming.

>>	Anonymous Sun Mar 18 17:27:09 2018 No.1351917 >>1351796 >conductive polymer switches I don't think those are considered mechanical switches, are they?

>>	Anonymous Sun Mar 18 18:49:29 2018 No.1351971 File: 10 KB, 338x338, ALPS.jpg [View same] [iqdb] [saucenao] [google] >>1351917 They are operated by hand and certainly not electronically controlled CMOS switches.

>>	Anonymous Sun Mar 18 19:14:18 2018 No.1351989 >>1351971 Yes but I mean in the context of keyboards. A mechanical keyboard is different to a rubber dome keyboard.

>>	Anonymous Sun Mar 18 20:13:42 2018 No.1352029 >>1351989 Would this ALPS switch count as rubber dome?

>>	Anonymous Sun Mar 18 20:36:07 2018 No.1352050 >>1352029 If it doesn't have a metal spring and instead uses rubber, probably. A proper mech-keyboard has copper contacts and a spring, have a nice strong detent, and last longer.

>>	Anonymous Sun Mar 18 21:04:13 2018 No.1352069 >>1352050 >last longer Very good. I'll try it as soon as the rubber dome gives up.

Anonymous Sun Mar 18 23:48:42 2018 No.1352141
File: 348 KB, 768x1365, 2m_Jpole.jpg [View same] [iqdb] [saucenao] [google]

>>1343155
Made a 2m (centered at 146Mhz) J-pole this evening.
I will need to get a SWR-meter and tune it in, but, preliminary, it works pretty good.

I used copper clamps for the feed points so I can move them to dial in a good SWR.

>>	Anonymous Mon Mar 19 00:07:17 2018 No.1352156 >>1352141 what coax are you using? it looks kind of thin, is it rg58?

>>	Anonymous Mon Mar 19 00:11:41 2018 No.1352158 >>1352141 Christ. Get it off the ground. It's a nice build but J-Poles only work 3-4 feet from a metal surface and the rebar in that patio is mucking it up.

>>	Anonymous Mon Mar 19 00:12:15 2018 No.1352159 >>1352156 Yes, it is MIL-C-17 / RG58 It was a decent length signal cable that was lying around the lab. BNC on both ends.

>>	Anonymous Mon Mar 19 00:13:30 2018 No.1352160 >>1352158 That isn't its permanent home. I just propped it up against the building so I could take a picture of it before transporting it home.

>>	Anonymous Mon Mar 19 05:30:25 2018 No.1352215 >>1351218 http://argon.printf.cc:8000/buzzer.ogg

>>	Anonymous Mon Mar 19 05:37:24 2018 No.1352219 >>1352141 Be sure the BNC is waterproofed well.

>>	Anonymous Mon Mar 19 05:43:09 2018 No.1352220 >>1352069 Well rubber dome and mechanical refer to keyboard switches, that image you posted is of a tactile switch.

>>	Anonymous Mon Mar 19 20:20:20 2018 No.1352585 >>1351217 >I have a shitty SDR and want to hear the Buzzer. what sdr do you have?

>>	Anonymous Mon Mar 19 22:48:47 2018 No.1352648 File: 6 KB, 218x136, tactile.png [View same] [iqdb] [saucenao] [google] >>1352220 Every manually operated switch is a 'tactile' switch, by definition.

Anonymous Tue Mar 20 01:18:18 2018 No.1352683

>>1352648
Tactile switch in the electronics context typically refers to a small short-stroke PCB-mount switch with a metal snap-disc as a spring. The term tactile refers to the tactical feedback you get from the snap-disc or similar spring, as opposed to a non-tactile switch which consists of two contacts with very little springiness between them. I would define them by terms of relative spring force, where the force required to get the switch moving is F0 and the force required to push the switch down to its base is F1. A tactile switch has F1/F0 close to 1 (i.e. it's nearly impossible to depress only partway), while a non-tactile switch does not. But that's just what a bit of digging and some electronic intuition/estimation has got me, feel free to use whatever definitions you prefer.

>>	Anonymous Tue Mar 20 11:20:37 2018 No.1352844 if a snap on ferrite choke is a bit bigger than the cable you are putting it on, will it still work? ordered what i thought was for rg8, but theyre a bit too big

Anonymous Tue Mar 20 14:53:16 2018 No.1352981
File: 119 KB, 736x548, high-tension-key.jpg [View same] [iqdb] [saucenao] [google]

>>1343155
For the next incarnation of /ham/ I would suggest to keep a duplicate of the lates version of the FAQ in the Radio/ directory and serve it as ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/Radio/radio_FAQ.htm without the version number in the filename. That way the FAQ linked in the OP is always the most recent.

http://biara.org/education/ has some interesting Training Documents, e.g. transceiver manuals and Ham Jargon, a very comprehensive pdf, all about CW, Q code and abbreviations.

For people preparing for a license: a Technician (426), General (426) and Extra (712) mock exam (questions) pool is at http://www.eham.net/exams/

73 es 55 de an0n .-.-. ...-.-

>>	Anonymous Tue Mar 20 21:14:34 2018 No.1353235 How much degradation in performance would I see when trying to receive 27 MHz CB traffic on an antenna tuned for the amateur 2 meter band? I'm toying around with the idea of using an RTL-SDR with an SBC as a scanner in my vehicle.

>>	Anonymous Tue Mar 20 21:55:17 2018 No.1353274 >>1353235 >How much degradation A lot. Leave off the ground connection (outer shield of the coax) and use it as a long wire.

>>	Anonymous Tue Mar 20 22:01:41 2018 No.1353278 >>1353274 >and use it as a long wire. In my car?

>>	Anonymous Tue Mar 20 22:41:20 2018 No.1353294 >>1352844 >if a snap on ferrite choke is a bit bigger than the cable you are putting it on, will it still work? Sure it will

Anonymous Wed Mar 21 00:21:22 2018 No.1353329

>>1352981
Trouble is, we only have write access, not delete or modify.

Also the FAQ is close to completed, I think I need juts one addition, on web based SDR systems. Inputs are always welcome.

We were also discussing earlier a separate tech FAQ for radio.

Anonymous Wed Mar 21 07:46:02 2018 No.1353492
File: 4 KB, 185x162, dirlist.png [View same] [iqdb] [saucenao] [google]

>>1353329
>we only have write access
Write access includes modify and delete but you only need to upload/save the same file under a different name. You then have .../radio_FAQ_Preview5.htm and .../radio_FAQ.htm in the .../Radio/ directory, both have the same content and the same size.

>>1353278
Sorry, overlooked the 'vehicle'. Just try it but don't expect much. If the VHF antenna is just a straight l/4 rod without any matching elements you have a short (capacitive) CB antenna.

Anonymous Wed Mar 21 11:48:22 2018 No.1353594

>>1353492
>Write access includes modify and delete but you only need to upload/save the same file under a different name.
Yes, I have given the files different names every time. I haven't tried overwriting a file with a new having the same name. A new version is coming up but after that I think it is done.

We are on page 9, about to fall off the list.

>>	Anonymous Wed Mar 21 13:12:39 2018 No.1353630 >>1353594 It's not about overwriting, it's about writing the same file twice, but the second time under the shortened file name.

>>	Anonymous Wed Mar 21 15:18:35 2018 No.1353704 >>1353630 OK. but what then when I have an updated version?

>>	Anonymous Wed Mar 21 15:54:25 2018 No.1353749 >>1353492 OK, the Radio FAQ is now updated to Preview 6. I just added links to WebSDR and the Hungarian site for remote viewing of radios. I think it is done now but I'd like comments and inputs.

Anonymous Wed Mar 21 19:37:27 2018 No.1353898
File: 110 KB, 686x571, The_Marconi_Company_first_antenna_system_at_Poldhu,_Cornwall,_December_1901.jpg [View same] [iqdb] [saucenao] [google]

>>1353749
Thanks, I'll look into the sdr.hu stuff, and websdr.org is really impressive.
Regarding antennas, it says "A single horizontal wire at 1/4 wavelength will do." It certainly will not do well, you need some kind of 'counterpoise' (like the other half of a dipole) or some kind of ground connection. l/4 antennas are almost always vertical and have either radials or a ground plane like the body of a car with the antenna on the roof. There is no such thing as a one-terminal antenna like there is no such thing as a one-terminal light bulb...

>>	Anonymous Thu Mar 22 00:16:47 2018 No.1354069 >>1353492 Wouldn't one just be able to increase the RF gain accordingly in that situation to alleviate the issue? Isn't that how those active antennas for shortwave listening work?

>>	Anonymous Thu Mar 22 00:31:03 2018 No.1354073 >>1354069 No

>>	Anonymous Thu Mar 22 02:23:41 2018 No.1354121 >>1353898 If your ground plane is something small like the body of a car, how small can the radius of your ground plane be compared to the wavelength for it to still give a good emission pattern? I'm guessing 1/4 wavelength as well?

Anonymous Thu Mar 22 06:21:30 2018 No.1354210

>>1353898
>Regarding antennas, it says "A single horizontal wire at 1/4 wavelength will do."
It depends on the focus of the document really. I asked if we should add more tech but consensus was to keep it simple. I might revive the proposal to do a more in-depth tech companion to this. Tentative table of contents
- frequencies, bandplans and use
- antennas adapted to the above
- receivers for the bands
- decoding/demodulation what is received, from modulation schemes to digital modes

Anonymous Thu Mar 22 06:52:11 2018 No.1354217

>>1354210
>band plans
those tend to be specific to regions. probably better to just steer people to ARRL or their national amateur radio association, a list of which might be more useful still
>signal identification
links here could be fun, like sigidwiki or others

Anonymous Thu Mar 22 07:04:50 2018 No.1354223

>>1354217
>steer people to ARRL
Most of the interesting things there are behind pay walls. Band plans seem to be multi layered anyways, like 160 m, 80 m 40 m etc , and then the plans within each bands such as CW, digi, voice etc. I was thinking of making it more high level.

>sigidwiki
That one is already in the existing FAQ.

>>	Anonymous Thu Mar 22 07:18:43 2018 No.1354231 >>1354121 >1/4 wavelength as well? Yes, that's a reasonable minimum radius. The bigger the better.

>>	Anonymous Thu Mar 22 09:36:15 2018 No.1354270 >>1353898 >>1354210 You don't need a counterpoise, unless you are transmitting. A ground plane is not the same as a counterpoise.

Anonymous Thu Mar 22 10:18:12 2018 No.1354284

>>1354121
>If your ground plane is something small like the body of a car, how small can the radius of your ground plane be compared to the wavelength for it to still give a good emission pattern? I'm guessing 1/4 wavelength as well?
1/4lambda antenna is a low impedance antenna and it requires a low impedance ground,
1/2lambda antenna is a high impedance antenna and it doesn't require a low impedance ground (surely it requires some kind of a matching device).

A ground plane for 1/4 lambda antenna can be replaced with few 1/4 lambda radials.

what frequency / band are you interested in

>>	Anonymous Thu Mar 22 10:34:29 2018 No.1354287 File: 34 KB, 591x467, counterpoise.jpg [View same] [iqdb] [saucenao] [google] >>1354270 common principle

>>	Anonymous Thu Mar 22 10:55:00 2018 No.1354293 We are about to fall off page 10.

>>	Anonymous Thu Mar 22 10:57:55 2018 No.1354294 Next stop: Archive

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/diy/ - Do It Yourself