/diy/ - Do It Yourself

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/ham/ - Ham/Amateur radio general Anonymous Sun Oct 21 16:55:10 2018 No.1484287 [Reply] [Original]

FAQ: ftp://50.31.112.231/pub/radio_FAQ_Preview8.htm

>>	Anonymous Sun Oct 21 16:58:17 2018 No.1484289 File: 979 KB, 2602x1608, hammer.jpg [View same] [iqdb] [saucenao] [google] >>1484287 OP in his shack

>>	Anonymous Sun Oct 21 17:00:00 2018 No.1484292 >>1484289 That guy is an Aviation Spotter. Look at the radios. Stop trying to insult us with the wrong hobby, idiot.

Anonymous Sun Oct 21 17:03:13 2018 No.1484295
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retarded neophyte here
just got my first SDR, I've been playing with it all day, chasing random frequencies around the FFT graph.

Started realizing about an hour ago, all of these transmissions sound the same, and they're all self-similar no matter the frequency band.
I'm almost certain it's some sort of interference. Am I right?
If I am, how can I figure out what's causing it, and how to stop it?
pic related

Anonymous Sun Oct 21 17:09:12 2018 No.1484297

>>1484295
Do you live within a few miles of an FM Radio Station? Looks like the same harmonics I get from a Mexican Music Station in the AM broadcast band (fucking interferes with 160 Meters all the way up to 60 meters for me).

You might need an FM bandpass filter.

>>	Anonymous Sun Oct 21 17:14:46 2018 No.1484301 >>1484292 no he is not, he monitors SW broadcast in the middle east. you're just mad cause his shack is cleaner than your.

>>	Anonymous Sun Oct 21 17:14:50 2018 No.1484302 >>1484297 >You might need an FM bandpass filter. This. Nooelectric has a decent one for cheap. I'd suggest picking up one of their baluns while you're at it. I went through the same ordeal with my rtl-sdr v3 until I got these two items.

>>	Anonymous Sun Oct 21 17:14:51 2018 No.1484303 >>1484297 the closest station to me is just shy of 7 miles. I do notice it gets stronger the closer I get to the FM band. How can I tell if something is a spurious signal/interference and an actual, intentional radio signal?

>>	Anonymous Sun Oct 21 17:19:41 2018 No.1484307 17 meters has been really active today. I've been hearing Europe all day long here in New England on my sdr dongle.First time I've seen that band so busy.

Anonymous Sun Oct 21 17:21:31 2018 No.1484308
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>>1484303
>>1484297
there's this tower of sorts about 2 miles away from me (it's within my line of sight) though I think it's a cell tower. I'm not sure if it would have any effect.

There's also high-power electric lines about a mile from me.

>>1484302
I'm on their site now. Are we talking about the "Flamingo FM"?

>>	Anonymous Sun Oct 21 17:22:00 2018 No.1484309 >>1484303 Those lines you see will remain narrow and constant. When an actual transmission occurs, you'll see a wider line and the wave form will bounce around more.

>>	Anonymous Sun Oct 21 17:26:31 2018 No.1484312 >>1484307 I have never heard activity on 17. Lovely CW signal from CZ at 18.071.

>>	Anonymous Sun Oct 21 17:26:41 2018 No.1484313 >>1484308 >Are we talking about the "Flamingo FM" Yes. Not sure what your plans are,or what other equipment you may have, but if you want to explore more, you're probably going to eventually want an upconverter and the AM bandpass filter as well.

Anonymous Sun Oct 21 17:28:48 2018 No.1484315

>>1484292
https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fhe.wikipedia.org%2Fwiki%2F%25D7%259E%25D7%2599%25D7%259B%25D7%2590%25D7%259C_%25D7%2592%25D7%2595%25D7%25A8%25D7%2593%25D7%2595%25D7%25A1&edit-text=

Anonymous Sun Oct 21 17:31:15 2018 No.1484320

>>1484313
I bought the rtl-sdr v3 too. I'm just a hobbyist doing a computer/electric engineering degree so it sorta goes hand in hand with my major. Not sure if I'll get too serious into Ham radio, but I'll probably at least get my license.

I've been looking into an upconverter already since apparently the rtl-sdr can't detect shortwave radio signals (I think). I'm definitely going to get the FM filter, and I'll probably get the AM filter too. I just don't know what all more I need (to connect, power them and such)

I wish I didn't live in a condo so I could put a decent antenna on my roof; for now I'm stuck with the default rtl-sdr kit antenna.

>>	Anonymous Sun Oct 21 17:34:28 2018 No.1484321 >>1484312 >I have never heard activity on 17. I hear locals on it every once in a while, but I've never heard Europe. Ireland,Britain,Scotland,Italy,France,German,and Lithuania were all nice and loud this afternoon.

Anonymous Sun Oct 21 17:48:41 2018 No.1484332

>>1484320
>Not sure if I'll get too serious into Ham radio, but I'll probably at least get my license.
That's cool. I respect anyone willing to put forth the effort involved in getting licensed.Personally, I have no interest in speaking over the airwaves, so I never bothered, but I do tend to feel slightly ashamed about not having one. It's a great hobby and there is tons to explore. In fact, there's so much going on tech wise, I think the community is not as close as it once was. Basically, all of these different modes have fragmented the circle jerk that ham radio used to be, and because of this, a lot of people are getting the false impression that the hobby is dying. I think the reality is that it's growing, but it's now spread out into more varied forms.Good luck.

>>	Anonymous Sun Oct 21 17:52:42 2018 No.1484333 >>1484332 More people got licensed last year than any other year in history. There's currently about 1 million actively licensed AR operators in the US including convicted felon Tim Allen. t. VE

Anonymous Sun Oct 21 18:01:28 2018 No.1484337

>>1484333
>More people got licensed last year than any other year in history
This would explain some of the insane pile-ups I've been seeing on certain bands. I had been chalking this all up to people simply being assholes.Well, I guess it's to be expected when there's only so much bandwidth to be had.

>>	Anonymous Sun Oct 21 18:13:59 2018 No.1484340 >>1484337 A big reason for the uptick is the lower cost of the Chinese radios, making the hobby more affordable and the other reason is doomsday preppers. Not that Baofengs are Decerted from Part 90, I'm not sure what's going to happen.

Anonymous Sun Oct 21 19:15:20 2018 No.1484358
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>>1484295
Once the consumer hypnosis is over you will learn what to expect from an 8bit radio with a dynamic range of about 50dB. Without filters, both notch and band pass, and a good attenuator you will be haunted by the intermodulation products of your own dongle.

Anonymous Sun Oct 21 20:03:55 2018 No.1484382

>be me
>electronics and antennas are cool
>I bet being a ham is fun
>get license
>nothing but old fucks talking the weather or unlicensed faggots hogging the repeaters for their commutes
>Check some local net, it's old people talking about electronics and antennas like they have never seen a resistor before
>Talk to a ham at work, he won't shuttup about all his QC cards and other faggy shit

God ham radio is possibly the gayest hobby I have ever witnessed.

>>	Anonymous Sun Oct 21 20:31:38 2018 No.1484402 >>1484382 3977.5 are talking about guns.

Anonymous Sun Oct 21 21:43:05 2018 No.1484429

>>1484382
I mostly listen in to hear people getting hostile with each other. It amuses me that we have these old timers and traditionalists bitching about the filthy talk on 80/75 meters, but everyone ignores the fact that contesters get on there and transmit with no regard to the fact that people are already occupying a particular frequency. I must have seen this happen at least a dozen times last week during the Pennsylvania QSO party. There were death threats being thrown around at one point. Obviously, if you're out there throwing out your call sign, you shouldn't be starting shit with people, especially when your name and address are easily looked up on the internet. Listening to 80/75 is becoming a lot like visiting 4chan.

>>	Anonymous Sun Oct 21 21:46:14 2018 No.1484431 >>1484429 3.995 late at night is a mix of /pol/ and /x/ Hilarious.

>>	Anonymous Sun Oct 21 21:49:55 2018 No.1484433 >>1484358 >consumer hypnosis please elaborate

Anonymous Sun Oct 21 21:58:17 2018 No.1484437

>>1484431
Yep. I was amazed at some of the crap these old guys were saying, you'd swear they were 4channers. Last night I listened to a rant that went on for about half an hour, consisting almost entirely of the words "asshole" and "pedophile". Apparently somebody out there doesn't like Joe.

>>	Anonymous Sun Oct 21 22:00:38 2018 No.1484441 >>1484437 Nobody likes AC1DD (Joe), K1LEM (Gary, the guy calling Joe a ped) or K9RSY. (Dave the Drunk Dick).

>>	Anonymous Sun Oct 21 22:01:57 2018 No.1484442 >>1484441 LOL! I knew somebody here would know what I'm talking about.

Anonymous Sun Oct 21 22:15:35 2018 No.1484449

>>1484442
They're probably more infamous than the 435 Repeater. AC1DD is why George Noory stopped transmitting on the bands and K9RSY drove Art Bell from the hobby as well.

If Smith would get off her ass and enforce the rules on those 3 fucks (Fines, Seizure, whatever), Ham would be fucking 1000% better.

Anonymous Sun Oct 21 23:55:17 2018 No.1484477

>>1484287
https://hackaday.com/2018/10/09/using-ai-to-pull-call-signs-from-sdr-processed-signals/
>yet another step closer to phone mode skimmers becoming a reality
It won't be much longer now, and it won't be much longer after that until the band police and serially offended realize they can LARP as the NSA and ruin most all ragchew potential on the HF bands. Too bad VHF and up where range is more limited is mostly dead outside of contests, especially if you want to use a mode other than FM.

>>	Anonymous Sun Oct 21 23:57:33 2018 No.1484478 dah-di-dah-dit dah-dah-di-dah I made myself a fugly iambic key.

>>	Anonymous Mon Oct 22 04:58:27 2018 No.1484565 File: 6 KB, 300x150, eti_msg.jpg [View same] [iqdb] [saucenao] [google] >>1484433 Unrealistic expectations induced by shiny commercial propaganda.

>>	Anonymous Mon Oct 22 05:31:49 2018 No.1484578 >>1484565 >commercial >propaganda If by commercial you mean the other hobbyists and with propaganda the hobbyists hyping up the misuse of a cheap TV dongle, then yeah. Why so paranoid?

Anonymous Mon Oct 22 06:57:37 2018 No.1484595

>>1484565
Oh I figured a $30 SDR wasn't going to be top notch by any stretch of the word.
I'm just too much of a novice to know the limitations, I wasn't expecting a local radio station to be able to universally interfere with the damn thing
Still much cheaper than the alternatives though, I'll deal for now

>>	Anonymous Mon Oct 22 08:46:25 2018 No.1484626 >>1484595 Good read: Managing HF signal dynamics and preventing overload with the RTL-SDR (and KiwiSDR) receivers http://ka7oei.blogspot.com/search/label/RTL-SDR

Anonymous Mon Oct 22 09:19:27 2018 No.1484632 [DELETED]

from what I'm reading about Balun/Unun antenna (adapters), you don't make a loop, but just use an open length of wire.

Now, according to https://www.sdrplay.com/docs/SDRplay_Optimising_Performance_RSP1A_LF_MW_HF.pdf, one of the optimal lengths of wire for an Unun antenna is 53 feet. Seeing as how I live in a condo, I'm going to need to be inventive with this.

Does it need to be 53 feet and straight? Or will it work as long as it's 53 feet and mostly straight so I can route it along my window frame outside (or along the gutter, etc)?

>>1484626
thanks for the link, this is all making a lot more sense now.

Anonymous Mon Oct 22 09:21:04 2018 No.1484633

from what I'm reading about Balun/Unun antenna (adapters), you don't make a loop, but just use an open length of wire.

Now, according to http://www.balundesigns.com/content/Wire%20Lengths%20for%204%20and%209-1%20ununs.pdf, one of the optimal lengths of wire for an Unun antenna is 53 feet. Seeing as how I live in a condo, I'm going to need to be inventive with this.

Does it need to be 53 feet and straight? Or will it work as long as it's 53 feet and mostly straight so I can route it along my window frame outside (or along the gutter, etc)?

>>1484626
thanks for the link, this is all making a lot more sense now.

>>	Anonymous Mon Oct 22 10:27:41 2018 No.1484648 >>1484633 Are you transmitting? If not you really don't need anything other than a wire. No matter the case, you will have significantly better reception if you get the wire out away from the house. You will be plagued with noise otherwise.

>>	Anonymous Mon Oct 22 10:53:54 2018 No.1484660 >>1484648 No, just receiving. Unfortunately I'm beholden to the HOA so I have to keep the antenna clandestine. Would trees interfere with the signal?

>>	Anonymous Mon Oct 22 17:18:59 2018 No.1484810 >>1484301 this

>>	Anonymous Mon Oct 22 17:25:41 2018 No.1484813 >>1484660 look up an endfed antenna. i think youll need a 9:1 balun. i think they might even sell a kit on ebay or amazon.

Anonymous Mon Oct 22 17:42:25 2018 No.1484818
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is this an actual broadcast or interference? It sounds like rumbling with intermittent squeaks

>>	Anonymous Mon Oct 22 17:48:02 2018 No.1484821 >>1484818 I'm thinking it's another intermodulation artifact, I found another just like it. I installed the FM and AM bandstop filters and they're helping but I'm still getting a lot of these spurious signals

>>	Anonymous Mon Oct 22 17:48:59 2018 No.1484823 >>1484818 The United Parcel Service runs ACSSB (amplitude-companded single sideband) digital voice and data for their network right at 220.

>>	Anonymous Mon Oct 22 17:52:08 2018 No.1484826 >>1484823 oh, so it's just an encrypted voice signal?

>>	Anonymous Mon Oct 22 17:54:25 2018 No.1484828 >>1484821 it's QRM you can see the harmonics on both sides as clear as day, it's off frequency as well

Anonymous Mon Oct 22 19:18:18 2018 No.1484869
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I've uploaded something about antennas to the dump space.

Light weight:
ftp://borg.moe/pub/end_fed_half_wave_antenna.pdf
Medium weight:
ftp://borg.moe/pub/all_about_antennas.pdf
Heavy weight (excellent book):
ftp://borg.moe/pub/Practical_Antenna_Handbook_5.pdf

And here's a podcast for people who like to listen:
Ham Radio Workbench HRWB044-Basic HF Antennas. Highly recommended.
https://traffic.libsyn.com/secure/workbench/HRWB044-Basic_HF_Antennas.mp3

Image: HOA-compatible end-fed antenna.

Anonymous Mon Oct 22 19:32:44 2018 No.1484878

>>1484818
If you're looking to how well your SDR works in the HF bands, I'd suggest parking on 4.724 USB for a while. It's the US Air Force High Frequency Global Communications Frequency.

They have been chatting almost non-stop for hours now. It will let you check your HF reception well.

Anonymous Mon Oct 22 22:00:47 2018 No.1484949
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>>1484878
nothing, but then again this is stock. I'm going to need to get an upconverter

Anonymous Mon Oct 22 22:06:27 2018 No.1484956

>>1484477
It would be possible to avert this slightly by playing around with 80 or 160 meter NVIS at lower powers at around noon plus or minus a couple hours so that the D layer keeps your signal from going to far, so long as the person you're worried about listening in doesn't live within a couple hundred miles of you. Only issue is the lack of activity during those hours because that's a bad time to be on those bands, so you're probably going to have a hard time finding people to talk to. There's also always CB if you want something shorter range with a similar experience to using the 80 meter band.

>>	Anonymous Tue Oct 23 04:53:34 2018 No.1485058 >>1484869 >I've uploaded something about antennas to the dump space. Thanks! A lot was lost when the old FTP went off line. Did anyone save the contents?

>>	Anonymous Tue Oct 23 09:41:44 2018 No.1485157 >>1484660 Trees won't affect it much. You may want to try something like a clothesline or flagpole antenna. I've never had good luck with wire antennas run inside or next to the house.

>>	Anonymous Tue Oct 23 09:44:01 2018 No.1485159 can I cover my power bricks and power plug strips with foil to reduce local interference?

>>	Anonymous Tue Oct 23 10:08:33 2018 No.1485163 >>1485058 you could try ferrite chokes. all of my laptops power supplies are so fucking noisy. noise floor drops so much when i unplug them all and turning off LEDs

Anonymous Tue Oct 23 10:13:09 2018 No.1485165
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>>1485163
I actually spent a good 1.5 hours disassembling an ancient desktop power supply to get a recently sized choke for my radio's antenna. Can't say I've noticed too big of a difference

It looks like my laptop chargers have chokes on them, but they look pretty small. Do you know where I could buy large chokes capable of fitting a power cable like the PSU one? Pic related

>>	Anonymous Tue Oct 23 10:21:41 2018 No.1485169 File: 2.44 MB, 4032x3024, image.jpg [View same] [iqdb] [saucenao] [google] >>1485165 eBay, amazon or aliexpress, or you can rip them out of electronics. I have all these on my hf receiver and it doesn’t help

>>	Anonymous Tue Oct 23 22:17:34 2018 No.1485494 >>1484477 >in the near future, you will receive automatically generated QSL like cards adorned with pictures of things like the ultimate wackermobile and signed "the radio police", for IDing 10 seconds too late

>>	Anonymous Wed Oct 24 08:43:36 2018 No.1485642 >>1485169 How about adding some to other cables too?

Anonymous Wed Oct 24 09:56:19 2018 No.1485672

So I'm remembering that my copy-paste popsicle stick condo wasn't grounded correctly because my guitar amp always buzzed when I tried to play. Could this house-wide miswiring be contributing to my QRM problem? How would you even correct for something this big if so?

I also notice that in the upper military air band I get extremely strong EMI directly correlated with what is on the screen of one of my monitors. Turning the monitor off reduces, but does not eliminate, the interference. This makes me think the QRM's coming from my graphics card. Would covering the interior of my computer case with copper foil tape help reduce this?

Anonymous Wed Oct 24 10:08:40 2018 No.1485675
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>>1485642
i have others on my laptops power supply, but that does nothing. i have an ic7300, so i can watch the noise floor drop when i unplug the laptop power supply. ive tried a few different PS, all seemed to be the same. i know my laptop is low end and older, but i see videos of people using computers next to their rigs all the time, getting a bit confused here

>>	Anonymous Wed Oct 24 10:54:26 2018 No.1485682 >>1485675 Indoor antenna? Poor grounding?

>>	Anonymous Wed Oct 24 10:56:11 2018 No.1485683 desu I'm starting to think all this money I'm dropping on fighting EMI might be better spent just getting a better receiver than an rtl-sdr

>>	Anonymous Wed Oct 24 11:17:30 2018 No.1485691 >>1485682 all the antennas are outside. it might be the grounding. i know i have electrical issues in the house. in some places, when i walk around with a cheaper handheld i get terrible interference, just sets the radio off.

>>	Anonymous Wed Oct 24 12:03:20 2018 No.1485726 File: 65 KB, 393x570, Rising RF noise floor calls for urgent action.jpg [View same] [iqdb] [saucenao] [google] >>1485691 >terrible interference Maybe someone uses PLC and poisons the mains wiring. It looks like pic, wideband EMI.

>>	Anonymous Wed Oct 24 12:08:04 2018 No.1485730 >>1484287 wtf do i do with a ifr 1600s? goddamn the interface sucks, an HP/tek/anyone interface 10 years older is better at least it has a af/rf gen, 1ghz spectrum analyzer, 1mhz (wtf) bandwidth scope, dmm

>>	Anonymous Wed Oct 24 12:10:56 2018 No.1485731 File: 3.06 MB, 4032x3024, image.jpg [View same] [iqdb] [saucenao] [google] >>1485726 Plugged in

>>	Anonymous Wed Oct 24 12:12:21 2018 No.1485733 File: 2.47 MB, 4032x3024, image.jpg [View same] [iqdb] [saucenao] [google] >>1485726 Unplugged

>>	Anonymous Wed Oct 24 17:12:45 2018 No.1485839 >>1485733 I get interference like that if I use the DVR Out on my TS-590SG. For me, it's a local AM radios station. Fucks with me in all bands up to 20 meters.

>>	Anonymous Wed Oct 24 18:48:03 2018 No.1485874 Someone gave me a 9:1 Unun and I'd like to make an end feed antenna for it resonant on 60, 30, and 15 (my G5RV doesn't tune up on those bands). What's the shortest wire I can get away with for that?

>>	Anonymous Wed Oct 24 20:42:56 2018 No.1485901 I managed to get a 5db reduction in floor noise (-50 to -55) by wrapping my rtl-sdr in foil, and then grounding the foil to a metal window frame

>>	Anonymous Thu Oct 25 09:50:09 2018 No.1486096 if i just want to mess around with SDR, is any cheap ebay RTL2832 ( ~$8-12) fine?

>>	Anonymous Thu Oct 25 09:55:56 2018 No.1486098 File: 436 KB, 2000x2490, calvin.jpg [View same] [iqdb] [saucenao] [google] >>1485683

>>	Anonymous Thu Oct 25 10:04:08 2018 No.1486102 >>1485874 http://udel.edu/~mm/ham/randomWire/

>>	Anonymous Thu Oct 25 10:04:36 2018 No.1486103 >>1486096 sure. but this is whats gonna happen >>1485683

>>	Anonymous Thu Oct 25 10:53:46 2018 No.1486110 >>1484565 >commercial propaganda There's a word for that anon, it's called "advertising." I understand you're trying to sound smart and redpilled but please stop.

>>	Anonymous Thu Oct 25 10:58:58 2018 No.1486112 File: 1.24 MB, 1200x828, 1488.png [View same] [iqdb] [saucenao] [google] >>1484287

>>	Anonymous Thu Oct 25 12:24:19 2018 No.1486145 File: 102 KB, 1192x956, Krug.jpg [View same] [iqdb] [saucenao] [google] >>1485683 >>1486103 Alternatively you can get a better antenna.

>>	Anonymous Thu Oct 25 12:35:59 2018 No.1486151 File: 129 KB, 686x571, Marconi.jpg [View same] [iqdb] [saucenao] [google] >>1486145

>>	Anonymous Thu Oct 25 12:37:03 2018 No.1486152 File: 51 KB, 800x734, digital-radio-scanner-6-antennas.jpg [View same] [iqdb] [saucenao] [google] my fav

>>	Anonymous Thu Oct 25 18:01:33 2018 No.1486266 File: 46 KB, 600x600, ccm-hockey-pants-tacks-7092-sr.jpg [View same] [iqdb] [saucenao] [google] >>1486152 Do you have a net an you could put that glorious contraption on?

>>	Anonymous Thu Oct 25 21:45:43 2018 No.1486353 >>1485165 >I actually spent a good 1.5 hours You got powdered iron core and not a ferrite one. It's kind of pointless unless you placebo will do

>>	Anonymous Thu Oct 25 21:47:12 2018 No.1486354 >>1486353 how does one tell this difference?

>>	Anonymous Fri Oct 26 01:05:53 2018 No.1486424 >>1486353 son of a bitch, no wonder it didn't do anything

Anonymous Fri Oct 26 14:56:00 2018 No.1486682
File: 146 KB, 800x595, krug-odessa-dalnitsa-image03.jpg [View same] [iqdb] [saucenao] [google]

The legendary Wullenweber seems quite straightforward with monopoles and screens. The epic Krug has a few more Gothic elements on the screen, what are the functions of this?

If I had the area I would have built a CDAA

https://www.dvidshub.net/video/458575/wullenweber-antenna-array

>>	Anonymous Fri Oct 26 17:04:25 2018 No.1486750 >>1484382 I like making antennas and trying many things with VHF-UHF propagation. But most people aren't worth talking to. I get more out of sending memes on SSTV.

Anonymous Fri Oct 26 17:23:16 2018 No.1486761
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>>1484382
This.

In 1970's every faggot in town was all about CB because it saved phonecalls. General chit-chat about radios and fagshit.
In 1980's the very same faggots went for 2m, or 100 watts on 27MHz, counting pathetic QSLs and bragging about equipment and tubes and shit they never used and never knew how they worked.
In 1990's those who weren't sick about CB banter were all about buying some gigantic radio shack... in order to have some Hurr Durr International Banter.
By early 2000's everyone in town stopped talking about radios and ham and shit.
2010's: a very few oldtimers came out again and organized a hamfest, that is, a Chink market selling Chinese trinkets to Hurr Durr Ham Radio Enthusiasts who only had 2nd hand UV5R shit.

>last guy bragging about a CW QSO: someone in early 1980's
>last guy using a homemade antenna: someone in early 1980's
>last guy keeping his shack on at least one hour a day: early 1990's
>last guy telling me something like "omg this also does 50 MHz!!": yestrday. I bet he'll never actually use it.

>>	Anonymous Fri Oct 26 20:57:50 2018 No.1486882 >>1484287 There still doing there, just BREAKED.

>>	Anonymous Sat Oct 27 06:44:50 2018 No.1487043 >>1486882 What does this even mean?

Anonymous Sat Oct 27 07:27:58 2018 No.1487056
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>>1485874
If you want 'native' resonances then it is about 28m, the half-wave length for 60m. Impedance at the end is in the kΩ range. Many people suggest a transformer with a 6:1 to 8:1 turns ratio for a 50Ω coax feed. There's an interesting equal impedance point for all three bands at about 9.35m which could be a suitable feed point for your 3:1 transformer. If you want to transmit you still may need a tuner and you will always need either a good rf ground connection or a counterpoise. There is no single pole antenna system.

Anonymous Sat Oct 27 16:45:29 2018 No.1487335
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Been away for a while.
Digging out my old stuff.
Can't find my mic. Pic related.
Anyone know where I can source one cheaper?
It's Alinco DR-140TQ
(RJ45 style plug)

Thanks!

>>	Anonymous Sat Oct 27 16:59:06 2018 No.1487338 >>1487335 i always assumed there was a way to put other connectors on, but im not sure about that.

Anonymous Sat Oct 27 17:02:52 2018 No.1487341
File: 3.75 MB, 6300x4031, United_States_Frequency_Allocations_Chart_2016_-_The_Radio_Spectrum.pdf.jpg [View same] [iqdb] [saucenao] [google]

anyone working on any projects? currently building a few ladder line jpoles to give out to some new members at the next meeting.
im wondering if i should put them all inside pvc with a bulkhead connector on the end and give them out that way, but im not sure if everyone would have the space to put that up

>>	Anonymous Sat Oct 27 17:53:16 2018 No.1487356 >>1487338 I might have to but I'm trying to avoid that.. Radio also has a wonky volume knob.. Maybe I'm better off buying a new (used) rig.

>>	Anonymous Sat Oct 27 18:05:05 2018 No.1487364 >>1487356 you take it apart yet?

>>	Anonymous Sat Oct 27 18:11:53 2018 No.1487367 >>1487364 No, I think it's the potentiometer that's bad the knob doesn't seem removable. I'm gonna see if I can find more info on it.

>>	Anonymous Sat Oct 27 18:21:57 2018 No.1487373 >>1487367 id get a used yeasu or icom in the meantime, and rip it apart to fix once you do. hopefully you can fix it.

>>	Anonymous Sat Oct 27 18:30:41 2018 No.1487381 >>1487373 I also found my vx-5r. Got it charging right now how it'll key up. I'm kinda to poor for new gear right now. Babies are cute but expensive.

>>	Anonymous Sat Oct 27 19:15:32 2018 No.1487410 >>1487381 i hear ya. im saving to buy some land, but ive found some awesome deals on gear, and older hams have helped me out. being part of a club can be real great

>>	Anonymous Sat Oct 27 19:19:07 2018 No.1487413 >>1487410 Yeah when I was younger I was way involved. I've moved now and there's no club in my area.

Anonymous Sun Oct 28 04:49:53 2018 No.1487686
File: 36 KB, 1148x343, j-pole.jpg [View same] [iqdb] [saucenao] [google]

>>1487341
Good action. I'd say PVC tube for stationary/outdoor, naked twin lead for portable/indoor hanging from a tree or the ceiling. There's also an open stub version mentioned in the ARRL Antenna Book (pic left) and the open stub slim jim variant with a closed connection at the top of the twin lead.

Anonymous Sun Oct 28 17:54:15 2018 No.1488077

>>1486761
Most of the cool cats have moved on to the digital modes and kept up with technology.They get their gear from ebay or other internet markets.They converse online.
The majority of old fucks you see at hamfests are people who are trapped in the 1980s and think there is nothing more then FM/ssb phone.

>>	Anonymous Sun Oct 28 18:07:51 2018 No.1488087 >>1487686 Got any info for a diy 144/440 antenna? I'm thinking maybe a dual JPole? Input/Suggestions?

>>	Anonymous Sun Oct 28 18:50:08 2018 No.1488106 How active are you guys' local repeaters? It's rare for me to ever hear any conversation besides the morse code identifier every few minutes

>>	Anonymous Sun Oct 28 18:51:50 2018 No.1488108 >>1488106 I have two dozen repeaters and on some, I have never heard anyone and others are usually active at drive time and have evening events/nets.

>>	Anonymous Sun Oct 28 19:15:51 2018 No.1488119 >>1488106 I've been monitoring again lately and the 3 I can reach and dead quite. It's kinda sad.

Anonymous Sun Oct 28 19:33:36 2018 No.1488128

>>1488106
The FM ones are a ghost town around me. The linked DMR ones always have something going on though. During rush hour I actually run in to BUSY's trying to access our local site.

Here is the live netwatch of a few networks.
http://www.netwatch.nydmr.net/
http://cbridge.k4usd.org:42420/MinimalNetwatch
http://www.ve2tax.com/lastheard.aspx

>>	Anonymous Sun Oct 28 20:16:23 2018 No.1488151 I've never run DMR Googled it didn't seem to help my understanding. Got a link?

>>	Anonymous Sun Oct 28 20:25:36 2018 No.1488157 >>1484320 you can use direct sampling mode on your v3 to receive shortwave. https://www.rtl-sdr.com/rtl-sdr-blog-v-3-dongles-user-guide/

Anonymous Sun Oct 28 20:48:36 2018 No.1488172
File: 95 KB, 580x310, tdma.jpg [View same] [iqdb] [saucenao] [google]

>>1488151
This is a little dated but i guess it is a start. It would be better to have a local guy actually demo it in action to really understand what is going on.
http://www.dmr-marc.net/media/Amateur_Radio_Guide_to_DMR_Rev_I_20150510.pdf

Its digital radio. 2 slot TDMA. So 2 users can use the same frequency at the same time. It also supports text messaging. And with IP linking you can easily link repeaters together. Its very much like trunking radio where you have "talkgroups" which are kinda like chatrooms on an IRC server. When you connect to a repeater and key up on a specific talkgroup the repeater will start broadcasting that 1 talkgroup for you.

So bob in NYC can be on talkgroup "TAC310" and Jimmy in Philly can also be on "TAC310" and talk to each other though the network. If only those to guys are on the TAC310 talkgroup then only those 2 repeaters that they are actually on will broadcast their conversation. The rest of the repeaters in the network wont carry their traffic and be free to carry other talkgroups. Also your radio will ignore traffic from other talkgroups you are not tuned to.

So your 1 local repeater could have access to tons of different talk groups around the state, country, or world. If you program your radio right you wont even have to worry about selecting repeaters. The radio will roam like a cellphone from repeater to repeater automatically. You just select the talkgroup and go. And with TDMA 2 guys can use the same repeater on 2 different talkgroups and not interfere with each other.

There are also "Local" talkgroups that do not go out on the network. So you could talk with someone locally and not have it be heard statewide. Simplex is also possible.

>>	Anonymous Mon Oct 29 05:35:08 2018 No.1488329 >>1488172 This definitely helped. Thanks you!

>>	Anonymous Mon Oct 29 06:35:44 2018 No.1488351 >>1486354 >how does one tell this difference? Color marking. Yellow with a white stripe is a mix #26. It has low AL value and as such the winding will have low inductance and you'll get bad attenuation of HF/RF noise.

>>	Anonymous Mon Oct 29 06:46:24 2018 No.1488354 >>1488351 Aren't those colors totally manufacturer-specific?

>>	Anonymous Mon Oct 29 06:51:52 2018 No.1488356 >>1488172 What's a good starter radio? I see some used stuff and some stuff made my YTY.

>>	Anonymous Mon Oct 29 07:14:49 2018 No.1488364 >>1488354 >Aren't those colors totally manufacturer-specific? Most manufactures adhere to the common coloring scheme. Even chinese do that. Sure thing not every manufacturer but most of them do I

>>	Anonymous Mon Oct 29 07:53:56 2018 No.1488370 >>1488356 Check the FAQ, it covers this. Briefly, either a crystal radio or RTL-SDR.

>>	Anonymous Mon Oct 29 11:07:22 2018 No.1488444 >>1488370 RTL-SDR is receive only isn't it?

Anonymous Mon Oct 29 11:41:02 2018 No.1488461

>>1488356

After having a TH-9800 I would stay away from TYT.

Greatly disappointed by the lack of features that you'd think would be obvious that other radios, even Chinese brands, would have.

Thing had busy channel lockout enabled all the time with no way to disable it. The radio had no VOX function. They frequency steps for 900mhz recieve were lacking. They could have extended the band to recieve broadcast links and maybe have wideband recieve for that but didn't.

>>	Anonymous Mon Oct 29 11:55:52 2018 No.1488468 >>1484340 Did they decert all Baofengs? We kinda don't need certification anyways. It is more of a technicality for sales like DOT certification for car parts. Is it an extension of trade war with PR China?

Anonymous Mon Oct 29 12:04:28 2018 No.1488474

>>1488077

I like FM for the voice quality.

DMR makes you sound like a drunk Microsoft Sam.

I wish stuff like the Icom 1200mhz data radios would have became more popular.

We have so much ghz bandwidth that can be used for data that nobody gives a fuck about.

You have a hard time telling half the people out there we have spectrum above 2M.

They think 70cm is only for short range repeaters and even mentioning using that it can be used for simplex is so alien to them.

>>	Anonymous Mon Oct 29 12:26:17 2018 No.1488489 >>1488474 I remember when 2 meters what Poppin. Club I was in even did sstv on 2 meters every Saturday night. Fast forward I pull out my radio (2m/70cm) totally dead minus yesterday one did comms for a marathon. >Cool.

>>	Anonymous Mon Oct 29 14:34:07 2018 No.1488562 File: 49 KB, 537x477, DA-18-980A1.png [View same] [iqdb] [saucenao] [google] >>1488468 >We kinda don't need certification anyways. A ham radio license is not a carte blanche. Welcome to the Twilight Zone.

>>	Anonymous Mon Oct 29 16:49:32 2018 No.1488619 >>1488444 Correct.

Anonymous Mon Oct 29 17:32:46 2018 No.1488639
File: 32 KB, 496x211, Screen Shot 2018-10-28 at 9.00.16 PM.png [View same] [iqdb] [saucenao] [google]

>>1488474
>DMR makes you sound like a drunk Microsoft Sam.
The $90 chink radios like the tyt md380 sound bad on dmr but they are very popular on our network.You just get used to it after a wile.The higher end tait, motorola, kenwood, etc stuff all sound fine. And that really isn't surprising since dmr is a mature product in the commercial lmr radio world. The chinks and hams are still new to it. They are sounding better with each revision though.
Another cool thing about dmr that wasn't mentioned is it supports ipv4/ipv6 networking in the latest spec. I have yet to see any amateur networks play with that but I am sure it will come. I know txting is popular at least now.
We have just about all of lower new england covered and linked on 70cm dmr. Some states have statewide portable coverage. . 2M is a fucking wasteland. All the repeater pairs are taken up by boomers with their old analog repeaters that do nothing but ID every once in a while with that dumb 1980s robot voice. They are worse then domain squatters. Just sitting there unused like zombies taking up spectrum and tower sites.

>>1488356
>What's a good starter radio?
TYT MD-380 is what everyone starts with to get their feet wet.They are so popular they are now on amazon prime. They suck but they work. And since they are so popular you can easily find a codeplug (local programing) to copy in to yours form someone around you. I run old xpr4000 series motorola gear. Kinda a pain to get in to but I like the sound and build quality.

Anonymous Mon Oct 29 18:01:58 2018 No.1488649

>>1484287
So how can I program my Baofeng UV-5R so that I can have all FRS and scan all of the FRS? I didn't wanna end up scanning every channel to bad I don't make any since.
>Be me want to scan all the FRS FREQ
>But not have the other channels be scanned.
Their is so many freq for the FRS was wanting to see if I could hear anyone using a Walmart Walkie Talkie but still have my Baofeng to use.
Radio Reference is a bit confusing only shows like 3 freq for my local emergency crew however my dad has a damn scanner that can scan all of the FREQ like wtf...

>>	Anonymous Mon Oct 29 18:05:29 2018 No.1488652 >>1488649 use chirp. but that thing scans so fucking slow

>>	Anonymous Mon Oct 29 18:13:57 2018 No.1488660 >>1488639 Thanks for the info! Im in Massachusetts and there's basically no activity in my area so I'm looking for somewhere to get active.

>>	Anonymous Mon Oct 29 18:26:36 2018 No.1488664 >>1488660 i head up to the cape a few times a year, i thought it was strange that they have a bunch of frs repeaters. id like to put up a 2m/440 yagi to hit the mainland

>>	Anonymous Mon Oct 29 18:52:07 2018 No.1488672 >>1488664 IDK if you'll find much more action. Only action I've heard was a town on cape running comms for runners.. you'd probably have to hit Boston or Providence to find some life.

>>	Anonymous Mon Oct 29 18:57:26 2018 No.1488674 >>1488672 there were to that were pretty active. i think it was closer to the beginning of the cape, because i was having trouble making it with my hand held. need to put an decent antenna up there

Anonymous Mon Oct 29 19:09:35 2018 No.1488679

>>1488660
>Massachusetts
Nice I talk to dudes in ma all the time. They are
connected to the national dmr-marc system.
For live activity see http://netwatch.nedecn.org/MinimalNetwatch
their website has everything you need to get a TYT on their network. http://nedecn.org/

Anonymous Mon Oct 29 19:16:16 2018 No.1488685

>>1488679
I guess I should save up and get a new radio.
Looking that way anyway since I can't find my mic and my radio is ancient..
I saw a tyt model escapes me but it also did 144/440.
Is tyt really junk or would it be worth investigating in something like that so I can work different modes?

Anonymous Mon Oct 29 19:40:54 2018 No.1488697

>>1488685
>Is tyt really junk
Yes but they work on dmr and are super popular so finding help would be easy. People even made hacked firmware to make them suck less. If you want to get your feet wet in digital and dont want to deal with used crap they are the cheapest way in. The only major issue I found with the tyt's is I could never get them to work simplex. Their timing sucks and they need to listen to another signal before transmitting to get in sync. Their drifty timing is where that "drunk microsoft sam" sound comes from. Getting a fm only 2m/440 rig will just lead to you getting board and dropping the hobby quickly imo. Analog above 50mhz is dead and not coming back.

>>	Anonymous Mon Oct 29 19:50:09 2018 No.1488705 >>1488697 It's a TYT-9600 144/440 anaolog and digital modes.. So DMR is the upgrade of IRLP when you had to use a million tones to get to someone? Is that even still a thing? Lol I'm gonna have to do some more research I guess.

Anonymous Mon Oct 29 20:02:55 2018 No.1488714

>>1488705
>So DMR is the upgrade of IRLP when you had to use a million tones to get to someone?
No its a digital mode and a bunch of other protocols. Its something that was around in the commercial world that hams adopted. I think it took off big time because it is an open spec. Icom, yeasu, and kenwood gimped digital ham radio for years with their own patented and all incompatible digital modes like DSTar. That greed is where a lot of hostility to digital comes from with hams.
And speaking of ma I just remembered about PAVE PAWS. You _need_ to get a dual band radio because 440 is restricted in parts of mass. You can't get by with just an MD380 (440 only) radio. PAVE PAWS is a radar system in eastern mass and thats why there are no high powered 440 repeaters there. Also something with Otis afb's radar.

Anonymous Mon Oct 29 20:07:18 2018 No.1488717
File: 12 KB, 480x62, Screen Shot 2018-10-29 at 8.05.18 PM.png [View same] [iqdb] [saucenao] [google]

>>1488705
>It's a TYT-9600 144/440 anaolog and digital modes..
http://nedecn.org/downloads/DMR-Code-Plugs/Tytera/MD9600_NEARFEST_Fall17.rdt
Should be no problem.

>>	Anonymous Mon Oct 29 20:12:19 2018 No.1488720 >>1488714 Ive never heard of that.. Also never actually run a repeater so idk what kinda power they're running. I always figured 2m was more bang for your buck since you still had some atmosphere advantage..

>>	Anonymous Mon Oct 29 20:24:13 2018 No.1488731 >>1488720 i think near mass they dont use 2m digital because of some interference to military bases.

>>	Anonymous Mon Oct 29 20:27:52 2018 No.1488734 >>1488731 Ohhh now I gotcha Makes sense the Navy has spots all over the state. Duxbury and the Navy just came to some kind of agreement to expand cell service in the area. Navy wasn't having it for years

>>	Anonymous Mon Oct 29 20:31:00 2018 No.1488735 >>1488731 Its 440. Ham is secondary on 440 to the military. Really only an issue for repeater owners. http://www.arrl.org/news/air-force-pledges-continued-cooperation-with-radio-amateurs-during-cape-cod-radar-upgrades

>>	Anonymous Mon Oct 29 21:13:15 2018 No.1488764 ham is dead

>>	Anonymous Mon Oct 29 21:16:28 2018 No.1488766 >>1488735 yeah, i remembered there was a reason i wanted a dualband dmr i have the HD1, believe its made by retrevis, but it reads ailunce. battery life is incredible, and pretty easy to navigate

>>	Anonymous Mon Oct 29 21:18:15 2018 No.1488769 File: 20 KB, 300x300, 1518811151785.jpg [View same] [iqdb] [saucenao] [google] >>1488764

>>	Anonymous Mon Oct 29 21:26:45 2018 No.1488776 >>1488766 >i have the HD1 I never heard of it but I just googled it and it looks solid.Like a clone of the newer moto XPR portables. Does that support dmr Tier 2? Thats required to get on the big networks iirc.

>>	Anonymous Mon Oct 29 21:40:21 2018 No.1488785 File: 528 KB, 3172x1379, IMG_8401.jpg [View same] [iqdb] [saucenao] [google] I normally monitor the 'Merica channel. Maybe I'll catch you fags there.

>>	Anonymous Mon Oct 29 22:12:08 2018 No.1488796 >>1488776 ill have to look. i monitor 91 most of the time

>>	Anonymous Mon Oct 29 22:30:23 2018 No.1488803 File: 95 KB, 748x421, Capture.png [View same] [iqdb] [saucenao] [google] >>1488796 >ill have to look. It must if your on "91". Thats on that big ass BrandMeister network.

>>	Anonymous Mon Oct 29 22:34:53 2018 No.1488807 File: 131 KB, 991x703, tankovertrenchlad.jpg [View same] [iqdb] [saucenao] [google] >>1488803 its world wide, i think 310 is the other big one. where are you pulling these pictures from?

>>	Anonymous Mon Oct 29 22:45:53 2018 No.1488812 3,873.00 is /pol/ right now.

>>	Anonymous Mon Oct 29 22:49:34 2018 No.1488815 >>1488807 that pic is just from brandmeister's website. The other ones are from http://nedecn.org/ and https://www.radioid.net/

>>	Anonymous Mon Oct 29 22:51:32 2018 No.1488817 >>1488652 Brah already used chirp I don't get how I could scan from all of the FRS starting with the first FREQ to the last FREQ for FRS Be pretty damn dumb to have to add each FREQ to a channel.

>>	Anonymous Mon Oct 29 22:52:37 2018 No.1488819 File: 811 KB, 3264x2448, IMG_8402.jpg [View same] [iqdb] [saucenao] [google] >>1488812 kek I just tuned there and it sounds like they are signing off for the night. I'll check back tomorrow

Anonymous Mon Oct 29 22:55:16 2018 No.1488820
File: 11 KB, 225x224, POL.jpg [View same] [iqdb] [saucenao] [google]

>>1488812
wish i had my antennas up. worked on them today but it got dark before i could drag them back up
>>1488815
ill have to check it out. just getting into dmr, a bit confusing, but its pretty neat
>>1488817
im pretty sure thats exactly what you need to do. its all just frequencys, channels are there just to make it easier for people.
>>1488819
/pol/ needs a freq

>>	Anonymous Mon Oct 29 23:07:10 2018 No.1488823 >>1488820 >/pol/ needs a freq 6900-7000 is always full of no ID pirates.

>>	Anonymous Mon Oct 29 23:11:30 2018 No.1488824 >>1488823 i live pretty close to a lot of hams, and i havent modded my radio yet. that would be a pretty big yagi

>>	Anonymous Mon Oct 29 23:38:04 2018 No.1488833 File: 48 KB, 640x424, IMG_8403.jpg [View same] [iqdb] [saucenao] [google] >>1488824 >yagi A simple G5RV wire antenna and a tuner can go anywhere 80m and above.

>>	Anonymous Mon Oct 29 23:47:44 2018 No.1488840 >>1488833 nothing my other wire tennas cant do.

>>	Anonymous Wed Oct 31 11:05:24 2018 No.1489607 ISS has been talking to kids pretty often. wish i had an antenna to talk to them, that would be pretty neat

>>	Anonymous Wed Oct 31 21:23:42 2018 No.1489892 >>1489607 >wish i had an antenna to talk to them, They are on VHF/UHF. It's not hard to make a simple antenna for that. Also the APRS digipeter is always on. That is really easy to connect to. https://www.fars.k6ya.org/docs/aprs_via_iss.pdf

>>	Anonymous Thu Nov 1 04:43:22 2018 No.1489976 File: 79 KB, 800x800, PassSkyChart2.ashx.png [View same] [iqdb] [saucenao] [google] >>1489607 Very short passes. www.heavens-above.com tells you when to listen.

Anonymous Thu Nov 1 09:54:29 2018 No.1490041

>>1489976
i just usually have the scanner on and i can hear it come by. theres a guy that lives a few towns over that does sat comms, and he has an antenna that reminds me of a tie fighter. really neat to watch it move. i dont think i would ever be able to afford something like that, much less put one together.
wish i could talk to the guy, but hes a giant cunt

>>	Anonymous Sat Nov 3 12:07:48 2018 No.1491093 >>1490041 >an antenna that reminds me of a tie fighter Weird. Can you take a picture and post it here?

>>	Anonymous Sun Nov 4 20:44:19 2018 No.1491966 >>1490041 >>1491093 Sounds more like satellite or moon bounce.

Anonymous Sun Nov 4 21:12:17 2018 No.1491980

>>1491093
ill try. its pretty far in the middle of nowhere.
>>1491966
im guessing it is. pretty sure its 2 phased yagis.
it just looks fucking cool. i cant imagine how much the tracking systems cost. im too stupid to build my own, quite a bummer. im not too interested in satcomms, but talking to the iss would be really neat

Anonymous Mon Nov 5 06:24:47 2018 No.1492099

>>1491980
I'm no expert but my understanding is moon bounce is a little easier but a good stepping stone.
There's a guy near me that does all that even has a club for it. He help a local school contact the ISS a couple years ago.
It's pretty rad but I don't have the time or money.

Anonymous Mon Nov 5 07:26:56 2018 No.1492116

Elecraft K4 when? They have retired old kits due to being unable to source old parts and this will only progress. I think K1 and K1x are gone. K2 is not that much promoted, I guess that is the next to go.

And I guess K4 will have to be capable of 2200 m operations.

>>	Anonymous Mon Nov 5 09:14:42 2018 No.1492162 >>1492099 thats pretty awesome. seems like a lot of work to set all that up though.

Anonymous Mon Nov 5 19:49:48 2018 No.1492429
File: 27 KB, 374x280, 3f176180.jpg [View same] [iqdb] [saucenao] [google]

Any of Yall know their way around hardware and specifically cabling?

I'm looking at installing a cellular repeater in a remote site behind a hill or two. I haven't measured it yet, but I'm looking at probably close to 400ft of cabling length to run out the top of the house, up the side of the hill and then up a 40ft tower on top. I'm looking at 7/8 heliax hard line which should get me a cable loss of around 6.8db at 1900mhz
The thing is, the kit comes with about 100ft of lmr400. It will work fine with the heliax right? I just put on N type ends and connect it up like normal? Or am I completely retarded?
Otherwise to clear the hill, I need about a 100ft tower.

Anonymous Tue Nov 6 00:58:54 2018 No.1492566

>>1492429
Well dang, I went out and surveyed the site again and I'm not going to get signal. I'm not even getting the 2100mhz from the tower no matter where I go. I mean the kit could pick up the signal maybe better then my phone, but it's not going to make something out of almost nothing. I also measured the run to be 525ft.
That leaves me with a different carrier and now I can just focus on 700-900mhz. But at least I can go with a less optimal location and use a lot less cable. May even get away with lmr400 hopefully

Anonymous Tue Nov 6 04:41:23 2018 No.1492597

>>1492429
Do you have a direct line of sight (LOS)? In that case you might look into optical links such as RONJA.

I live near a giant power distribution site with countless sources of nose. I also have a LOS to a 600 m tall mountain top that might be interesting for a QRP setup.

>>	Anonymous Tue Nov 6 11:36:53 2018 No.1492743 >>1492597 Wait, so is there a way I can convert the RF to optical like fiber and then back to RF?

>>	Anonymous Wed Nov 7 03:29:25 2018 No.1493119 >>1492743 Sure. It is all just data. transfer data digitally and you are golden.

Anonymous Wed Nov 7 11:11:54 2018 No.1493250

>>1493119
Even in the cable on the way to the antenna? Because that's where I need to extend it, I can't reverse engineer the unit that does the signal boosting.

I did find exactly what I need. They make them for cell towers so they can run fiber up them instead of large cabling. But I can't imagine it would be cheaper than $15000.

Anonymous Fri Nov 9 08:52:20 2018 No.1494210

>>1493250
Ethernet cables are used to transmit digital data. Sure, there is an analogue signal that can be measured but the interfaces encode/decode between digital data and analogue high speed data for the physical layer.

Most use unshielded twisted pair, and 300 m is quite feasible.

Anonymous Fri Nov 9 12:11:14 2018 No.1494317
File: 33 KB, 325x244, image_preview.jpg [View same] [iqdb] [saucenao] [google]

Hi, total brainlet here. I found this article about a hombrew anti-jamming antenna: https://www.rfa.org/about/help/Anti-Jamming-05022007110912.html

And I have a question. Would a setup like this reduce interference on transmissions that are not being jammed? Would this improve signal quality at all?

>>	Anonymous Fri Nov 9 15:11:42 2018 No.1494443 >>1494317 >improve signal quality at all? If so then including the quality of the jamming.

>>	Anonymous Fri Nov 9 16:11:29 2018 No.1494472 >>1488820 yes. a containment frequency >>1488714 never mind the equipment manufacturers, it's those xMBE merchants and their patents that ruin the ability to ""legitimately"" homebrew digital gear without a $40 pre-programmed PIC or whatever

>>	Anonymous Fri Nov 9 17:30:06 2018 No.1494527 File: 1.23 MB, 1024x768, waterfall-pisos.webm [View same] [iqdb] [saucenao] [google] >>1486750 >SSTV >not sending memes in waterfall

Anonymous Fri Nov 9 18:51:36 2018 No.1494558
File: 51 KB, 1200x750, tfw no hf.png [View same] [iqdb] [saucenao] [google]

in EN82, using shit-tier 1m whip antenna and pleb-tier HackRF One with a broadcast AM trap, FT8 on 40m was hopping during greyline hours. first time i've been able to pull any HF with this rig

>>1494317
it's just highly directional. the wider the angle between the axis of the desired signal and the axis of the jamming signal/noise, the better a directional antenna will serve you

>>1494527
>1-bit graphics
>2018
how many layers of meme are you on?

>>	Anonymous Fri Nov 9 18:54:03 2018 No.1494560 >>1494558 Same grid here. Without that AM Trap, do you pick up that fucking Mexican Radio station about every 1000 kHz up to around 30 meters?

Anonymous Fri Nov 9 19:22:32 2018 No.1494568
File: 293 KB, 1026x630, it's dangerous to go alone, take this.jpg [View same] [iqdb] [saucenao] [google]

>>1494560
trap out, I heard it at 3100.9kHz just now loud and clear. didn't see it up the dial, but the HRF1's LO doesn't go below 5MHz anyway. it acts like a mixing product, maybe you need a few more ferrites
trap in, I see nothing on waterfall, hear only the faintest shadows of it
Pic related, my trap is just a 4th-order Butterworth high-pass filter at 3.5MHz. I'll worry about 80m once I can pull in 40m comfortably
btw pen knife and copper adhesive tape on FR-4 is a comfy way to do SMD. 9/10 would build again

>>	Anonymous Fri Nov 9 19:26:04 2018 No.1494570 >>1494568 I only get when I have the DRV on TS-590SG set to Ant Out for my panadapter. If Ant out is off, I don't get the signal. I wish I knew how to resolve that.

>>	Anonymous Fri Nov 9 20:45:56 2018 No.1494618 >>1494558 >how many layers of meme are you on? All of them. Here, have some more bits. https://vocaroo.com/i/s0ljSAHtmDP3

>>	Anonymous Sun Nov 11 10:01:07 2018 No.1495433 >>1491980 >ill try. its pretty far in the middle of nowhere. Is it large enough to be seen on Google Maps?

>>	Anonymous Sun Nov 11 23:53:06 2018 No.1495874 >>1484382 Are you me?

>>	Anonymous Mon Nov 12 14:00:25 2018 No.1496164 why is this thread still here?

>>	Anonymous Mon Nov 12 14:05:07 2018 No.1496168 File: 101 KB, 1077x547, your being so dramatic.jpg [View same] [iqdb] [saucenao] [google] >>1484382

>>	Anonymous Mon Nov 12 18:35:23 2018 No.1496315 >>1496164 because your father's a turkey baster and your mother smelled of elderberries

>>	Anonymous Tue Nov 13 14:45:22 2018 No.1496747 File: 23 KB, 196x309, toolkit.png [View same] [iqdb] [saucenao] [google] Another Antenna Book ftp://borg.moe/pub/Antenna_Toolkit_2.pdf

>>	Anonymous Wed Nov 14 20:12:47 2018 No.1497508 File: 46 KB, 728x548, babbling.jpg [View same] [iqdb] [saucenao] [google] >>1496315

Anonymous Wed Nov 14 22:43:43 2018 No.1497561
File: 270 KB, 1600x1200, Alincowhalo.png [View same] [iqdb] [saucenao] [google]

It really puts the screws to my thumbs trying to buy a used radio when everyone is knocking 20 bucks off of MSRP and I can buy a new radio for 500 bucks and have a perfectly functional radio.
I have to be blind or does no one else have anything in the same price range as the alincos?

Anonymous Thu Nov 15 07:46:24 2018 No.1497698
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The Falcon 9 has been lifted upright at launch pad 39A under gloomy skies at the Kennedy Space Center. Liftoff is scheduled for 3:46 p.m. EST (2046 GMT).

Es'hail 2 carries the first amateur radio payload to fly in geostationary orbit.

https://spaceflightnow.com/2018/11/15/falcon-9-eshail-2-mission-status-center/

Anonymous Thu Nov 15 09:21:27 2018 No.1497729
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>>1497561
i recently got this bad boy. was looking to get a receiver, as i enjoy listing to shortwave, but i couldnt pass this thing up. one of the best decisions ive made.
>>1497698
>geostationary orbit.
where will it be above? hope im home in time to see liftoff, man that would be really neat to see in person

>>	Anonymous Thu Nov 15 14:00:11 2018 No.1497845 >>1497729 >i recently got this bad boy. What advantages does it have over the Elecraft range? Elecraft has a comparison chart that might just possibly be a little biased in the selection; I don't know.

>>	Anonymous Thu Nov 15 17:28:53 2018 No.1497986 File: 89 KB, 1275x691, Es'hail-2-coverage-area.jpg [View same] [iqdb] [saucenao] [google] >>1497729 >where will it be above? 25°30'E

>>	Anonymous Thu Nov 15 23:53:17 2018 No.1498159 never change 3860

Anonymous Fri Nov 16 09:54:13 2018 No.1498335
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Hey, guys, total brainlet here.

I like to listen to stations transmitting on the longwave band, but the reception on any portable I could find is absolutely horrible.

I am planning to build a loop to improve reception, but I don't have a variable capacitor. I was wondering if it would be possible to build a fixed (ie non-tunable) loop for a specific frequency? I would like to have three or four different loops for different frequencies, so I don't have to tune them.

Is this doable or am I just retarded?

>>	Anonymous Fri Nov 16 10:11:25 2018 No.1498343 >>1498335 are you confined to an apartment or do you have land?

>>	Anonymous Fri Nov 16 11:58:23 2018 No.1498410 >>1498335 >I was wondering if it would be possible to build a fixed (ie non-tunable) loop for a specific frequency? Yes, that is possible. Mind you, it is also possible to use a fixed capacitor with a variable inductor.

>>	Anonymous Fri Nov 16 13:45:15 2018 No.1498460 >>1498335 If you are building a loop then why not have a go at building a capacitor? It's just two metal combs/fingers that slide in and out of each other but never touch. must be to find some tutorials on it it's very simple idea.

>>	Anonymous Fri Nov 16 15:34:59 2018 No.1498511 >>1498460 Not him, but loop antennas can involve high voltages and for that reason people prefer to use vacuum capacitors.

>>	Anonymous Fri Nov 16 17:11:30 2018 No.1498569 >>1498511 He's not transmitting, Rx only.

>>	Anonymous Fri Nov 16 17:35:44 2018 No.1498581 >>1498511 not OP but would two blank FR4 pc boards pressed against each other make an appropriate and workable cap for a QRP Tx loop?

>>	Anonymous Fri Nov 16 17:44:02 2018 No.1498584 File: 51 KB, 1000x1800, 1521854218645.png [View same] [iqdb] [saucenao] [google] >>1498335 as an alternative, you could build a "channel selector" with half a dozen trimcaps selected by a rotary switch, which you tune once for each channel and forget

>>	Anonymous Fri Nov 16 18:20:49 2018 No.1498607 sorta related question got a CB radio in a car, standard euro frequencies I need an antenna that won't stand out, needs to look sort of oem any helical or something I can buy?

Anonymous Fri Nov 16 18:43:20 2018 No.1498620

Anyone have experience with RF grounding afloat? I'm installing an ICOM M-802 with a backstay antenna for my dad but the ATU is in the lazarette and I can't find a metallic through-hull in the aft. The previous grounding solution was apparently a (now badly decayed) mess of copper strapping connecting to anything metal on the boat but I'd really like to avoid the time and expense of running a bunch of copper through the hull but my dad won't bite on a dynaplate (even though the boat is being hauled) and won't let me just run a strip through an aft hatch and into the water when we need the SSB.

>>	Anonymous Fri Nov 16 23:05:45 2018 No.1498723 >>1498335 Just buy a variable capacitor from E-Bay. There's tons of them. Pair up a couple of them if needed.

>>	Anonymous Fri Nov 16 23:09:12 2018 No.1498727 >>1498584 That's actually a great idea. Not OP by the way, but thanks.

>>	Anonymous Fri Nov 16 23:10:39 2018 No.1498728 AC1DD is being a total faggot on 3860 right now. Laura Smith need to be fired for not fining this guy.

>>	Anonymous Fri Nov 16 23:19:04 2018 No.1498733 >>1498728 >t.scaredy-cat

>>	Anonymous Fri Nov 16 23:21:12 2018 No.1498734 >>1498728 come on someone with a Tx say something about imitation crab meat

>>	Anonymous Fri Nov 16 23:25:38 2018 No.1498736 >>1498734 I would, but my wire is covered in ice and I can't get my tuner to drop below 3:1 on the SWR. It amazes me how many people don't realize that that voice is Joe.

>>	Anonymous Fri Nov 16 23:25:52 2018 No.1498737 >>1484289 God I wish that was me

>>	Anonymous Fri Nov 16 23:37:59 2018 No.1498741 3.910. They're discussing CP pics they sent each other wtf

Anonymous Sat Nov 17 01:34:44 2018 No.1498786

Hey guys, so I have a question. I recently got into radio frequencies with arduino. I picked up rtl-sdr usb dongle a while back. I wanted to actually capture my car's key fob, I looked up the FCC ID that is inside my key fob, and I am curious, do I listen for the preamble? or do I listen for wake -> dead time -> preamble -> sync -> encrypt -> fixed etc...

Here is the link to what I am talking about..
>https://fccid.io/GQ4-29T/Test-Report/duty-cycle-calculations-1302474

is there a easier way to read radio signals in binary from a audio file? Audacity seems like what everyone uses, but to be honest it doesn't work for me.

Anonymous Sat Nov 17 01:43:08 2018 No.1498790

>>1489607
>Reading over this thread slowly getting enthused about a new hobby
>Says I can talk to ISS (I assume crew members)

Please, introduce me into this world. Do I really need to get a licence (USA)? What are the ramifications if I don't? Can this all be accomplished for less than 100$ if I build it all by hand?

Anonymous Sat Nov 17 07:07:23 2018 No.1498863
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>>1498343
I live in an apartment, so it would have to be put indoors.

>>1498723
Okay so I opened a cheap AM/FM radio I had laying around and it has this inside. That's a variable capacitor, right? Do you think I could desolder this and use it?

Anonymous Sat Nov 17 07:23:04 2018 No.1498864
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>>1498863
This radio was absolute dogshit, and I think I know why: One of the three legs of this thing was broken. This was supposed to be soldered, like the other two, but it was cut in half by who knows what.

Could I still use this for a loop antenna, or is it totally broken?

Anonymous Sat Nov 17 08:59:10 2018 No.1498890

>>1498864
Better check how it works with a multimeter with capacitance function. If you don't have one you might check the area for a ham that might assist, it takes just seconds to check.

You really want to know the max and min values for the capacitance.

Anonymous Sat Nov 17 10:00:14 2018 No.1498907
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>>1498890
Thanks a lot for your help, Anon. Just another question, as I'm really curious about this.

The cheap Chink radio from which I got the capacitor worked like shit. It had a selectivity so bad that a single station covered like half the entire MW band.

According to this article (https://www.petervis.com/electronics/tuning-capacitor/tuning-capacitor.html)), the ferrite antenna should be connected to the C4 and middle pins. However, on this radio, the ground cable of the ferrite antenna was connected to the C1 pin, which according to the article is reserved for the FM antenna (?).

Could this be the reason why this radio was so shitty? I can't believe that the Chinks that designed this radio made such an obvious mistake.

>>	Anonymous Sat Nov 17 10:36:43 2018 No.1498924 >>1484287 how do start completely legal pirate station without being triangulated?

>>	Anonymous Sat Nov 17 10:44:02 2018 No.1498926 >>1498924 Don't broadcast. If you're emitting, your locatable, period.

Anonymous Sat Nov 17 13:16:40 2018 No.1498955

>>1498907
Hard to tell. My guess is that the subsequent intermediate frequency stage had too wide bandwidth.

If that one AM station was local it might have swamped the bandpass filters. In that case you might need a notch filter to reject that one station.

>>1498924
Transmitter are normally easily located. It takes specialised skills to avoid that. A far better solution is to make an internet radio, that makes it easier to attract a wider audience. And old broadcasts can be made available as podcasts.

>>	Anonymous Sat Nov 17 13:19:11 2018 No.1498956 >>1498924 NSA/FCC have stations that can triangulate a broadcast in a matter of seconds.

Anonymous Sat Nov 17 15:06:52 2018 No.1499024
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>>1498956
I don't think they are interested in petty pirates. The FCC has outsourced part of the snitching to the ARRL OO ('official observer') service.
https://www.rfcafe.com/miscellany/homepage-archive/2014/FCC-Insists-That-Amateur-Operators-Wear-Brown-Shirts.htm

>>	Anonymous Sat Nov 17 15:18:20 2018 No.1499031 >>1498786 Hak5 has a bunch of videos about this on youtube.

>>	Anonymous Sat Nov 17 15:48:48 2018 No.1499041 >>1499031 and shannon has some huge milkers

>>	Anonymous Sat Nov 17 20:58:04 2018 No.1499195 File: 157 KB, 1278x692, balls cut off.jpg [View same] [iqdb] [saucenao] [google] >>1499041 I'd just like to say this is post 225

>>	Anonymous Sat Nov 17 22:07:27 2018 No.1499246 >>1499031 I ended up buying a doorbell from the store, and mess with that first. Also hak5... Its ustgoing to be about yard stick one, and using gnu radio or rf cat or whatever. I will figure it out, slow and steady.

Anonymous Sat Nov 17 22:17:18 2018 No.1499251

Radio related but not ham related, how much use does CB SSB see? I've been monitoring channels 36-40 on both LSB and USB for the past few days with an RTL-SDR with the squelch set about 2 dB above the noise floor and haven't even had the squelch open and the scanner software stop. There's generally quite a bit of normal AM activity on the other channels around here though.

>>	Anonymous Sun Nov 18 21:19:01 2018 No.1499914 bored of FT8 and CW already, need some new digital modes to listen to. any suggestions, preferably on 80m?

>>	Anonymous Mon Nov 19 01:54:39 2018 No.1500016 >>1499914 Have you mastered high speed Morse yet?

Anonymous Mon Nov 19 14:00:15 2018 No.1500277

>>1499251
The only time I've found people on SSB was shooting skip on the east side of the rockies. I live in the west, but as soon as I passed Colorado channels 36-40 were lit the fuck up with people from all over the country and south of the border, forgot if it was mostly upper or lower sideband, think it was both though. That kept going on for a few hours. CB is so much more active on the east half the country, it's fucking dead everywhere I'm at unless you're offroad talking to offroaders or catch the truckers going through (and not many of them use CB anymore). I keep it scanning while I'm driving all the time, never have picked up sideband chatz around me. I have a 63" antenna sticking out of the roof of my car. Hoping when I get my ham license I can at least adjust it and get good 10 meter chat, maybe that will be more active.

>>	Anonymous Tue Nov 20 00:06:48 2018 No.1500642 File: 366 KB, 726x342, before+after.png [View same] [iqdb] [saucenao] [google] welp, I guess contesting this season is over

>>	Anonymous Fri Nov 23 18:14:53 2018 No.1503061 bump

>>	Anonymous Sat Nov 24 10:38:50 2018 No.1503381 >>1500642 Erm, why?

Anonymous Sat Nov 24 13:51:45 2018 No.1503479

>>1484382
Yeah, I kind of agree. But this is partly, IMHO, because they eliminated the code requirement, partly because it's too easy to just buy everything, and everyone wants MOONBOUNCE NAO.
That and the mystique is kind of gone because you can talk "DX" on the Internet like it's nothing.

>>	Anonymous Sat Nov 24 13:55:12 2018 No.1503481 >>1498924 Distributed low power transmitters that randomly cycle on and off -- but why? Every tinfoil faggot on earth has a youtube channel.

Anonymous Sat Nov 24 21:32:10 2018 No.1503662

>>1499024
>I don't think they are interested in petty pirates.
Historically that's been the case but in the last few years the FCC has been cracking down on illegal stations in a big way. If the LPFM initiative wasn't made of fail and AIDS this wouldn't be the issue it is.

>>	Anonymous Sun Nov 25 19:38:52 2018 No.1504155 I'd just like to say that this is post 237

Anonymous Sun Nov 25 21:29:38 2018 No.1504197
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>>1484287
I have this diy 60's kit shortwave tube radio given to me by someone, it works and picks up one or two AM stations at best. Is something like this even good enough to pick up any interesting signals?

Anonymous Sun Nov 25 21:36:21 2018 No.1504202

>>1504197
Anything from the 60s is probably going to have dead capacitors and weak tubes if it hasn't been restored, but if it's working fine you could listen to all sorts of stuff...but being a regenerative set it' a bit tricky to learn how to tune if you're a noob

https://www.youtube.com/watch?v=bPfwBfXph5U

>>	Anonymous Sun Nov 25 21:39:22 2018 No.1504204 >>1504202 neat I'll check that out. so far it works fine i check out the internals, caps seem to be okay even though they are wax/paper tube (?) kind. worst case i either salvage the vacuum tubes or give it to a radio bro

>>	Anonymous Mon Nov 26 05:50:59 2018 No.1504378 >>1494568 Nicely done, been using an airspy HF+, and actually had to take my filters out. My biggest issue is antenna now.

>>	Anonymous Mon Nov 26 10:59:10 2018 No.1504460 >>1504204 one more thing, i'm just using whatever internal antenna the unit has, do i have to use a fancy outdoor antenna to pick up the good stuff?

>>	Anonymous Mon Nov 26 12:44:20 2018 No.1504486 File: 52 KB, 1024x565, dipole.jpg [View same] [iqdb] [saucenao] [google] >>1504460

>>	Anonymous Mon Nov 26 12:45:22 2018 No.1504488 >>1504460 you can probably use an alligator clip attached to that antenna and just run a long wire outside

>>	Anonymous Mon Nov 26 14:00:14 2018 No.1504517 File: 39 KB, 590x690, 1516526406579.jpg [View same] [iqdb] [saucenao] [google] >>1504460

>>	Anonymous Mon Nov 26 15:43:52 2018 No.1504575 >>1504517 Small untuned RX loop. SDR users haunted by local QRM and overload problems should give it a try before anything else. Details at http://kk5jy.net/rx-loop/

>>	Anonymous Mon Nov 26 15:48:51 2018 No.1504578 >>1504486 >>1504488 >>1504517 cool I'll try it out this weekend. would be nice to pick up some interesting stuff

Anonymous Mon Nov 26 17:23:40 2018 No.1504615

on Wednesday, SpaceX is launching a shitton of small satellites on the SSO-A mission. Included in this is Fox-1Cliff, which will have an amateur radio repeater onboard! Also flying is PW-Sat2. If you can receive frames from it you can win a contest: https://pw-sat.pl/en/ham-contest/

launch thread is up on /sci/ if you're interested
>>/sci/10168221

>>	Anonymous Mon Nov 26 17:24:42 2018 No.1504617 >>1504615 whoops >>>/sci/10168221

>>	Anonymous Mon Nov 26 17:25:38 2018 No.1504618 >>1504575 >local QRM can confirm, nulling out the shack computer feelsgoodman >overload can't really confirm or deny, my loop has an amp on it >>1504578 ragchew about death metal on 3967.5 rn

>>	Anonymous Mon Nov 26 21:33:06 2018 No.1504732 >>1504615 also, there is a contest to listen to the ESEO signal (you can win a shirt) http://www.esa.int/Education/ESEO/Be_the_first_to_catch_a_signal_from_ESEO

>>	Anonymous Tue Nov 27 03:32:03 2018 No.1504828 >>1504618 >loop has an amp on it Interesting. Is it a symmetric amp? Can you post the circuit diagram?

Anonymous Tue Nov 27 04:50:58 2018 No.1504844

>>1498790
Yes, get your license. Stiff fines and other penalties if you don't and get caught. Even if you don't get caught, you're going to stick out like a sore thumb and nobody will want to make contact with you.

$100 could go a long way with some ingenuity.

I'm blown away by the sheer number of my fellow Massholes I've seen in this thread. Any of you lurk 2m/440 repeaters in the state? Any particularly active ones? Seems like nearly every one I can hit near my home or work is dead, but get some decent contacts at the xyl's place.

>>	Anonymous Tue Nov 27 07:34:39 2018 No.1504916 File: 8 KB, 443x377, 1516777950735.gif [View same] [iqdb] [saucenao] [google] >>1504828 yep. this one, built with 2N3904s, connected to a 2-turn loop of 22awg stranded hookup wire

>>	Anonymous Tue Nov 27 07:37:36 2018 No.1504917 HOT NEWS ========= ftp://collectivecomputers.org:21212/Books/Cyberpunk/Tech/ is back. And all the files are there from what I can see. Please make backups in case it falls off the net again.

>>	Anonymous Tue Nov 27 07:39:53 2018 No.1504920 >>1504844 Plymouth County here. I monitor a couple 2m/440s 90% dead. I've heard a weekly net and some running event.

>>	Anonymous Tue Nov 27 14:35:45 2018 No.1505107 >>1504916 Thank you.

Anonymous Tue Nov 27 18:00:15 2018 No.1505205

What kind of batteries do you guys have your HF transceivers running off of?
I have a bit of extra money now so I'm thinking of upgrading from my Baomeme to a proper HF setup. I'm purely interested in ham for the SHTF, so the rig I get has to be able to run off the grid. I've looked at some of the QRP transmitters like the Yaesu FT-818 but people are saying that QRP is a terrible first transceiver since it's so difficult to work with low power.

>>	Anonymous Tue Nov 27 19:02:25 2018 No.1505225 >>1504844 graylock is active

>>	Anonymous Tue Nov 27 19:15:48 2018 No.1505229 >>1505225 Thanks, but I don't believe I have the capability to hit that from my area. Yet.

>>	Anonymous Wed Nov 28 16:37:59 2018 No.1505607 >>1504920 I've gotta agree with this, about 90% of activity I hear is weekly nets. It's a damn shame that there's repeaters sitting there idle, with nobody even bothering to put a call out, let alone return one.

>>	Anonymous Thu Nov 29 07:46:04 2018 No.1505948 >>1505607 Seriously. I've monitored for hours at a time, I've called. Haven't got a single contact since I got some of my stuff up and running. Now I'm studying for General and thinking of trying DMR.. Maybe I'll have more luck elsewhere..

>>	Anonymous Thu Nov 29 11:57:22 2018 No.1506059 >>1505205 car batteries are fine (and widely available post-SHTF) outboard HF amps can be homebrewed or built from kits

>>	Anonymous Thu Nov 29 19:50:10 2018 No.1506268 46 to go

53-year-old Boomer !!t4EOsos/GSJ Thu Nov 29 21:54:33 2018 No.1506308

>>1484287
So does anyone build analog receivers/transmitters anymore, or is everything SDR?

When I was a kid I was going to get into amateur radio, even got taken to a couple ARRL meetings. Soon as my paranoid mother found out I'd be 'talking to strangers' over the radio, that was the end of that. Didn't stop me from trying to build receiviers and transmitters out of junk parts from old TV sets though (all tube).

>>	Anonymous Sat Dec 1 16:19:31 2018 No.1507337 >>1506308 http://www.qrparci.org/wa0itp/csts_book.pdf soldersmoke.com https://www.youtube.com/results?search_query=vk3ye https://www.w1wc.com/homebrewing/ sparkbangbuzz.com The easy 10 transmitter has never failed me.

>>	Anonymous Sat Dec 1 23:51:56 2018 No.1507587 File: 233 KB, 656x480, 1534889814061.jpg [View same] [iqdb] [saucenao] [google] kawaii

>>	Anonymous Sun Dec 2 07:24:57 2018 No.1507707 >>1507587 Simple way to double the operating range. http://ham-radio.com/k6sti/wifiyagi.htm

>>	Anonymous Mon Dec 3 07:50:43 2018 No.1508392 Kerchunking the thread so I can bookmark these links later.

>>	Anonymous Tue Dec 4 09:15:41 2018 No.1509124 >>1508392 Monitoring

>>	Anonymous Tue Dec 4 13:16:40 2018 No.1509240 so i finally got my rtl-sdr. any advice on which frequency ranges to look at? i'm not getting shit except random beeping noises.. i'm in Norway.

>>	Anonymous Tue Dec 4 13:28:29 2018 No.1509243 >>1509240 what kind of sdr? what kind of antenna are you using? do you have space to put one outside? are you near a city or in the woods? what are you looking to listen to?

>>	Anonymous Tue Dec 4 13:36:41 2018 No.1509247 >>1509243 got the kit from rtl-sdr.com: RTL2832 with dipole antenna (2x 1m telescopic) currently testing it indoors, in a small city was hoping to listen to other ham operators, random baofengs, pizza delivery guy, whatever's out there

>>	Anonymous Tue Dec 4 14:19:39 2018 No.1509266 7200 is crazier than I have ever heard it right now. K9RSY sounds drunker than ever.

Anonymous Tue Dec 4 19:41:51 2018 No.1509435

>>1509247
>RTL2832 with dipole antenna (2x 1m telescopic)
nice, but throw the antenna in the trash (not really)
>currently testing it indoors, in a small city
you should be able to see something. im not sure if there is a radioreferance.com type of website for norway, but we can put in our area and look up what frequencies are being used around us. but there should be something out there that you could use as well.
but you really want to get the antenna outdoors, a lot could be interfering with it.
also, are you licensed? the last part isnt a big deal.

>>	Anonymous Tue Dec 4 19:47:41 2018 No.1509439 >>1509247 also, are you using windows or linux? what program(s) are you using?

>>	Anonymous Tue Dec 4 19:50:29 2018 No.1509441 >>1509266 I miss Joe on 3860. that was some 10/10 liberal trolling

>>	Anonymous Tue Dec 4 19:59:28 2018 No.1509445 >>1509441 AC1DD? I heard him trolling on 3813 about a week ago. Hadn't heard him in weeks.

>>	Anonymous Tue Dec 4 20:27:15 2018 No.1509466 31 to go

>>	Anonymous Tue Dec 4 20:45:31 2018 No.1509474 >>1509441 >>1509445 how far do these faggots blast out? im on east coast

>>	Anonymous Tue Dec 4 20:47:56 2018 No.1509476 >>1509474 K9RSY and AC1DD can be heard in California, the only thing they're doing legal on the air is the watt limit. AC1DD is in Illinois and K9RSY is in Tennessee. K1LEM is in Missouri, I think but his signal is much weaker for me (sector 8).

>>	Anonymous Wed Dec 5 11:29:54 2018 No.1509800 >>1509435 will try it outside soon. not licensed, but as far as I know, the rtl-sdr can only receive, and I have no plan on transmitting anything. >>1509439 using sdr# on windows, but I have a linux machine available, might try on that one

>>	Anonymous Thu Dec 6 03:51:03 2018 No.1510206 >>1509266 >K9RSY sounds drunker than ever He has earned himself a hashtag on Twitter, hilarious stuff.

>>	Anonymous Thu Dec 6 13:05:27 2018 No.1510438 >>1510206 id really like to make a twitter, but they always ask me for a phone number, and that ends there

>>	Anonymous Thu Dec 6 13:08:07 2018 No.1510442 >>1510438 Google Voice burner number.

>>	Anonymous Sat Dec 8 09:50:03 2018 No.1511519 File: 410 KB, 1598x895, Capture.png [View same] [iqdb] [saucenao] [google] any ideas why i don't get any sound out from dsdplus? input is set to vb cable, and output is set to my speakers. why isn't it decoding and playing voice?

>>	Anonymous Sat Dec 8 09:55:44 2018 No.1511520 >>1511519 holy shit, i'm starting to hear something guys. tried using dsd 1.7 instead, and we're getting somewhere. had to also use inverted signal mode. will report back later

Anonymous Sat Dec 8 12:39:23 2018 No.1511619
File: 227 KB, 2000x1185, radiation.png [View same] [iqdb] [saucenao] [google]

So, maybe radio nuts on /diy/ will pull through since /sci/ are clueless/unresponsive.

If we could naturally transmit and receive electromagnetic radiation, and could control its properties enough to converse with one another, what natural conditions (or the radiation's properties) would allow for our conversations to remain relatively private?

By "private" I mean, that me saying "well I DID fuck his girl last night!" would not:
A) travel past my friend and into the street for all to hear until eventually reaches space and travels for millennia for distant cultures to know about
B) Fry his internal organs and give him cancer

I was trying to think of the necessary density of the atmosphere, the wavelength being sufficiently swallowed by natural materials, the natural noise in the environment and so on. I mean, airwaves are much better for this purpose than like gamma radiation, but I was curious nonetheless. The bonus is that one could in theory kill someone by yelling at them loud enough, which I believe social media has been working on for a while.

>>	Anonymous Sat Dec 8 12:46:28 2018 No.1511627 >>1511619 You can't stop the signal, Mal. If you cast a signal, it can be intercepted.

Anonymous Sat Dec 8 12:50:37 2018 No.1511631

>>1511627
That's fine - but what would affect the signal enough that it doesn't travel, say, more than noise traveling through the air would? Will a very dense atmosphere absorb certain wavelengths fast enough for that? What frequencies here on Earth (if at all) fail to travel further than a few hundred meters? Sorry, I'm a layman in this field.

>>	Anonymous Sat Dec 8 12:53:50 2018 No.1511635 >>1511631 You could probably try an ELF signal on a few watts. Going to need a big antenna to transmit, though.

>>	Anonymous Sat Dec 8 13:10:29 2018 No.1511651 >>1511635 >an ELF signal on a few watts By that do you mean my second question (here on earth, right now)? How far would such a signal travel unobstructed?

Anonymous Sun Dec 9 00:43:28 2018 No.1512141

>>1511619
>what natural conditions (or the radiation's properties) would allow for our conversations to remain relatively private?

Make an encoded transmission via direct physical contact at the lowest possible level of power and utilizing a submillimeter frequency.

>>	Anonymous Sun Dec 9 03:13:46 2018 No.1512209 >>1512141 >direct physical contact But then NO conversation is public - you literally have to touch everyone you want to hear you.

Anonymous Sun Dec 9 03:33:16 2018 No.1512214

>>1512209
Are you fucking retarded? There was nothing in the question about this hypothetical RF communication being the only method available and the premise is implictly against this interpretation. "If [H. Sapiens] could" without a "but" somewhere in there is tantamount to "if [H. Sapiens] could also", in which case all historical methods of interpersonal communication are on the table next to the hypothetical object of the greater inquiry.

Anonymous Sun Dec 9 08:05:47 2018 No.1512293

>>1511619
Check the FAQ - many intelligence agencies intercept all RF communications.

Frying internal organs is not possible from what I know but you could boil them using microwaves. In that case he is quite dead and cancer is impossible. Ionizing radiation can cause cancer.

>>	Anonymous Sun Dec 9 08:21:39 2018 No.1512297 >>1512281 >omnidirectional antenna I would leave it at that and focus on the three (!) ground stations needed for triangulation. Did you ever post anything about frequency, distance, available power and legal conditions?

Anonymous Sun Dec 9 09:50:56 2018 No.1512341

>>1512297
Well I'm basically starting to look into the possibilities at the moment. The rocket will have 2kN of thrust, but it won't reach space. (Rocket 1 at least, the goal is to scale things over time). The engine is currently being developed by us. I have to admit I know very little about telemetry and radio, I'm studying automation and control circuits.
That being said, currently we're sending a overengineered water rocket up to gather data and while we are writing the data on a sd card we also want a radio control to monitor information, remote start etc. Because of that I'm asked to maximise the range we can get out of this while still having reliable data transmission, maximum of information and rannge (while keeping weight and cost down).

The way I see things data transmission is tied to frequency and hardware (data rate/clock speed of the electronics) , reliability is primarily dependant on the signal strength and therefore efficiency. Due to weight I'd like to keep the rocket antenna simple.

I'm in germany, so we can't just use whatever frequency we want.
For reference: World record for students is 44Km, european record is 32km. The dream is the Kármán Line (but we realise that we can at best hope to get there with rocket nr.3-4.

>>	Anonymous Sun Dec 9 09:52:25 2018 No.1512342 >>1512297 (2/2) What I wanted to add was that we will likely not use triangulation to get the location of the rocket, but if we did we would indeed need 3 ground stations. Thanks a lot already for all the infos btw.

>>	Anonymous Sun Dec 9 12:26:01 2018 No.1512474 10 LEFT

>>	Anonymous Sun Dec 9 14:04:02 2018 No.1512589 I stumbled upon a numbers station last night, how often do they appear?

>>	Anonymous Sun Dec 9 14:18:51 2018 No.1512604 >>1512589 A lot. There's also many broadcasting all the time. There's websites that log them, you can look if yours was on there and if not submit the frequency. Feel free to look them up on http://websdr.ewi.utwente.nl:8901/

>>	Anonymous Sun Dec 9 14:46:07 2018 No.1512631 >>1512589 >>1512604 priyom.org has the broadcast schedule. HFGCS is not exactly a numbers station but they broadcast encrypted messages fairly frequently on known US Nuclear Forces frequencies.

>>	Anonymous Sun Dec 9 17:12:56 2018 No.1512734 >>1512342 Looked into GPRS?

>>	Anonymous Sun Dec 9 17:41:35 2018 No.1512755 >>1512734 I have now. Will look into it. Thanks.

Anonymous Sun Dec 9 18:04:17 2018 No.1512783

>>1512214
>Are you fucking retarded?
how rude!

>>1512293
>many intelligence agencies intercept all RF communications
Well, naturally developing the use of this communication in a way that is not easily intercepted was what originally made me curious - whether or not there's a set of circumstances (atmosphere composition for one, signal properties for another) that would prevent normally longer-traveling electromagnetic radiation from traveling more than a few hundred meters without being actively absorbed by a non-natural element of some sort, so that relatively private language could still take place in social creatures.

>>	Anonymous Sun Dec 9 18:47:36 2018 No.1512824 >>1512783 >how rude! So that's a yes?

Anonymous Sun Dec 9 19:53:23 2018 No.1512860
File: 10 KB, 639x438, Segelstein_RI.gif [View same] [iqdb] [saucenao] [google]

>>1512734
Oh beans, I meant to say APRS.

>>1512783
Physicist here, all substances have atomic and molecular resonances that absorb radiation. Generally speaking, these are in specific groups, some of which absorb microwaves, some of which absorb visible light or IR, some of which absorb UV and X-rays, etc. Microwaves in particular are absorbed readily, and it's the electric (not the magnetic) part of the light wave that is absorbed by the charges of the atom/molecule. Basically the electrons and nuclei are bound to one another by an attractive force, and the presence of an electric field pulls the two apart much like a spring. Like any system with a spring, these have a resonance frequency at which they best absorb the driving energy, and since all atoms and molecules have fairly similar structures and hence energy levels, these absorption frequencies are in similar bands. You can see this expressed in the electric permittivities of the substances, a purely real value means the sine's argument remains purely imaginary (exp(iaωt)), but a complex permittivity leads to both a real and imaginary part of the argument (exp(iaωt)*exp(bωt)), the real part will give a decaying exponential, which is how the absorption of light in a medium is expressed in terms of EM waves. So if you take a look at a chart of air's complex permittivity (or refractive index) as a function of frequency, you'll find increases in the imaginary part corresponding to absorption bands. You may have to do a little math to figure out the absorption rate from these values, however.

Anonymous Sun Dec 9 19:56:18 2018 No.1512862

>>1512860
>>1512783
And a non-natural element with different absorption bands can likely be found, but you would have to surround yourself with it, at which point a faraday cage would work better. I'd simply encrypt your conversation instead of trying to prevent it from propagating. In any case, wifi bands seldom travel more than a few hundred metres due to their absorption by the water in the air (that's why a microwave internet signal will get bad when it rains).

Anonymous Mon Dec 10 21:51:05 2018 No.1513740

What are some good sources for learning about amateur radio and topics surrounding it? I noticed that a lot of the electronics people that I watch on youtube are into it, so I figure that it might be something worth getting into, but I am generally clueless and don't really know where to start.

Anonymous Mon Dec 10 22:07:26 2018 No.1513751

>>1513740
>https://www.youtube.com/user/davecasler
>https://www.qrz.com/hamtest/
>http://www.arrl.org/find-an-amateur-radio-license-class
I used Dave's videos to get a vague understanding of the underlying concepts and started taking the practice tests on QRZ. After a few weeks I looked up a class close by and took my notes of areas I was weak in according to QRZ and brought to the class to get familiarized. After the class my test scores jumped and after another couple weeks and aced the test. Hope this helps!

>>	Anonymous Mon Dec 10 22:39:33 2018 No.1513767 >>1513751 Thanks.

>>	Anonymous Tue Dec 11 13:42:19 2018 No.1514169 File: 754 KB, 360x360, kiwifarms.webm [View same] [iqdb] [saucenao] [google] I live on a big mountain overlooking downtown LA (it's about 3 miles above sea level. Cool things I can do from up here?

>>	Anonymous Wed Dec 12 00:00:56 2018 No.1514540 >>1514169 squeaky power wars on K6MWT

>>	Anonymous Wed Dec 12 01:30:01 2018 No.1514579 >>1514169 >kiwi That isn't a kiwi, looks closer to a weka.

>>	Anonymous Thu Dec 13 01:00:32 2018 No.1515267 >>1514169 >(it's about 3 miles above sea level. Are you an idiot or just bad at math?

>>	Anonymous Thu Dec 13 01:07:10 2018 No.1515268 >>1515267 Well he's bad at parentheses either way.

>>	Anonymous Thu Dec 13 01:18:24 2018 No.1515271 >>1515268 I suppose that 1600 miles could count as "overlooking downtown LA", considering that that's where the nearest 3-mile summit is.

>>	Anonymous Thu Dec 13 03:24:01 2018 No.1515304 File: 22 KB, 270x360, Mount_San_Antonio_(Mount_Baldy).jpg [View same] [iqdb] [saucenao] [google] >>1515271 3 km, not 3 mi.

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