/diy/ - Do It Yourself

The Chad Repeater

>>2592490

>>2592490
Chad and repeater don't go together.

How to make a synthetic aperture radar?

>>2592490
You can hear it, but it can't hear you.

>>2592486
CQ CQ calling CQ!

>>2592568
W0LD6UY this is KPR0ST@T3 in bumb fuck egypt I read you 5 9 Over!

I have one of these. I wonder, can I get onto the channels mall security uses? I think they have Motorola radios. It wouldn’t be funny to listen.

>>2592579
>mall security use
Who the fuck cares? May as well just listen to the WB.

>>2592583
What frequency range does this thing operate on? Is it encrypted? Can I get on it with the Baofeng? It would be interesting to listen to in my specific case, to know when the clientele is throwing bricks again at the glass doors (safety).

It's probably Motorola XPR7350e. The feds here don't carry guns so when there's some shit going down you're expected to run or hide somewhere while they trash the place with bricks.

>>2592585
Look up the business license, fag. Those are programmed and channelized so only a few specific frequencies can be accessed. It's also likely they're trunked, if not P25 (and trunked).
>huh?
Do some fucking research yourself.
>>2592591
>MOTOTRBO
>do baomemefags really?

can you connect a baofag to a computer and have it scan the entire spectrum over a day to identify active frequencies?

>>2592595
Not sure and in any case it ouwld be complicated, slow and inefficient. It is far easier to use RTL-SDR and scan the full bandwidth continuously and record whenever a carrier comes up on frequency.

I'm convinced here should be an automatic ban for every post mentioning retarded SDR.

>>2592486
Are there any handhelds that will do ham radio and allow you to talk on air band. Again, for clarity, TALK on airband not just listen.
>I am Helicopter pilot recently had a radio out
>I want to get a better handheld for HAM but I don't want two handhelds, just one that does both.

>>2592591
>>2592585
Just find the manual amd see what the defaults are.

They are programmable but people are also lazy as hell and just use them as walkie talkies with the default channels.

>>2592605
Check what the power is on your helicopters radio. I was surprised how shit some ATC sounds when listening to flight breakdowns on YT. A handheld might not be in the league of reaching other planes or ground units

Does anyone have suggestions for a decent, compact, water resistant mobile radio that does ~20-25W output on 2m/70cm (a monoband 2m would be fine too)? I want something I can toss in a backpack and take with me when I go camping or hiking that I could run off of a LiFePo4 battery. If it can do low power at 5W that'd be nice too. I was looking at this TYT TH-8600 but I'm worried that it's just a Baofeng in a mobile radio chassis.

>>2592605
Not really, air band uses AM modulation and is outside the normal receieve range of ham radio handhelds which are also using FM modulation. You might be able to make it work if you used an all-mode mobile radio that's able to transmit on any VHF frequency, but the FCC and the FAA probably want you to use a type approved air band radio.

>>2592612
It was a legitimate failed radio that required expensive repair. (Luckily the company pays for it)

>>2592612
>A handheld might not be in the league of reaching other planes or ground units
At vhf frequencies it's all line-of-sight anyway.

>>2592613
I know the anytones (also chinese) have okay receivers and work really well on uhf/vhf. I run mine at home with a diamond x50a.

Any news from the diagram-anon? The flowchart of what rigs and activities to chose showed a lot of promise.

>>2592613
>water resistant mobile radio
lol. lmao.

Nice antenna in the OP's pic. That Anon did an excellent job not giving his money to the antenna jews to DX on 10m by creating his own antenna. Never give money to the antenna jews.

>>2592961
Don't get me wrong. I could pay far out the ass for something like the Discovery TX-500 and get HF at the same time as getting what I'm wanting in my OP, but I figured there was at least something out there a step above chinkshit.

>>2592972
The antenna jews don't want you to know this but the copper wire in abandoned buildings is free and you can take as much as you want home with you.

>>2593025
for a mobile radio you'd be better off buying one based on it's radio capabilities rather than its weather proofness

When I do sota I keep my shit in a dry bag in my pack and have an old pack raincover I keep in there so if I get surprised by rain or if I'm camping and have the radio setup but not in use I'll just throw the cover over it like a shower cap

>>2593030
Keep this in mind: if you see a vehicle parked on the street, with no one in it, it's abandoned and therefore free for the taking.

>>2593042
That's a good point and I appreciate the note on your setup. I don't want to spend a ton of money on a radio that dies if it gets some rain on it, but maybe I can find & use one of the older Yaecomwood mobiles that were built to last in rough conditions and do my own waterproofing.

>>2593052
yeah it's a lot easier and more effective to just plan with the mindset of "I just wont let water get on my radio" instead of "Gee I hope my radio survives when I plan on getting water on it"

>>2592486
Has anyone tried the BTech FRS B1 or A1? Is it worth the upgrade from a 500 mW FRS radio?

>>2593064
I picked the Radioddity version of the FRS A1, the Radioddity FS-T1. The screen interface is more autismal and it uses USB micro B instead of USB C for charging but they're cheap and you can loan them to a friend or relative to use while you're out somewhere. I'd say the range is just under a mile on the ground in a suburban area.

>>2593082
>Radioddity FS-T1
>more autismal
Based. I wonder if they have an equivalent to the B1 too. I'll have to do some research.
>cheap and you can loan them to a friend
Yeah I buy these things in bulk and give them away so cost is very much a factor.

Why don't we have phased antenna arrangements for wifi? Imagine having powerful radio beams tracking your device without interfering with other networks and keeping amazing range and speed. The fuck they are waiting for?

>>2593313
My understanding is that MIMO is more effective in practice. Some of the reasons being that you don't need to know anything about the physical environment or the mechanical characteristics of the stations, and because you can opportunistically take advantages of multiple RF paths that might be available.

>>2593313
Not sure about WIFI but it was planned for more recent versins of cell phone standards. This takes a fair bit of processing power but since bandwidth is expensive the added expenses can be justified.
Already the electricity bill from base stations are a major expenses post for telecom operators.

Good asian pipeline today.

>>2594103

>>2594104
>>2594103
>FT8
>asian pipeline
Does downloading anime also count as DXing to you?

>>2594105
Only if it's via rtty literotica.

>>2594105
I have a 10m dipole hung up 30 feet pointing directly east/west, and I might see 4 or 5 Japan stations a day. What am I doing wrong?

>>2594105
>>2594111
And that's on ft8 through the program too.

>>2594111
Your dipole is pointing east/west?
Or is your dipole radiating east/west?

>>2594107
>rtty
>literotica.
imagine the decode
boomers may reach levels of seething previously unknown
anime was a mistake desu

>>2594114
Radiating. East and west are broadside to the antenna.

>>2594124
Time to look at a globe and see if you need to correct it some a dozen degrees or two.

>>2594125
I shouldn't, Europe gets in fine.

>>2594343
Could be your operating times then, also Asia has insane local QRM in some places

>>2594345
I go by grey line maps, and I run decent power at 50 watts on data modes so I'd hope they'd come in better.

>>2594429
Search for a KiwiSDR around where you hope to be heard and check how noisy it is over there, may shine some light

>>2594111
Where do you live? I know my dipole was pretty gimp compared to the hexbeam I made, check OP pic.
Here's a direct comparison, although my trapped dipole might have loss versus a proper wire.
https://m.youtube.com/watch?v=xBHVjJErsIU

Ignore my hands, I'm not fat they just got weirdly thick after I started work in masonry a few years back.

>>2594508
>not cw
TL;DW

What do you guys think of the multi-band trap-less yagis by optibeam?

Big antennas mean you are trying to compensate small dicks right? Small antennas mean your dick is totally fine. Is that correct?

>>2594508
wow, that's significant

>>2592524
https://hackaday.com/2012/04/28/build-your-own-radar-system/

>>2594744
That's why people talk about diminishing returns for directional antennas. Yeah, a 3 or 4 element yagi would make a hexbeam sound like shit, but if you get a full-copy from dx stations on both, what would the benefit be?

So let's say you upgrade from a hexbeam to a 3 element yagi for the bands you work. Some of those stations you never quite could dig out are now understandable. To get a significant boost in performance over a 3 element yagi, you basically need to go to a 5 or 6 element though.

>>2594551
I'd give anything for the ears and brains to do that.

>>2595051
That's what I said to myself a year ago.
/ham/ may be retarded, but almost noone is too retarded to learn it

>>2594111
10m Japan comes in best for the US at 0-4am GMT, which starts in 90 minutes from this message.

Okay boys, 25ft. Pulled an ass muscle doing it so no more leg day for a few weeks.

>>2595458
Should have been doing your squats, deadlifts, and eating your oats instead of being a lardass.

>>2595600
What makes you think I'm even remotely fat?

Do 5/8 wavelength antennas work at frequencies of 900 MHz to 6 GHz?

I cant think of a reason why it wouldn't, but I never see these

>>2595715
Like this? Or do you want something with bandwidth from 900mhz to 6ghz?

>>2595720
yep, just like that, not looking for wide bandwidth.
so I was actually not looking at 900MHz as much, good to know it works there.
but what about 2.4GHz and higher? I have not been able to find 5/8 wavelength antennas for 2.4GHz, which is making me think it might not be a good idea for some reason.

>>2595706
You're in a ham radio thread

>>2595163
I hear ya, it's a mental block. CW seems to be an art, not a science.
I can recite the alphabet and send around 15wpm, but listening and recalling it in live time is where I fail.

>>2595752
There's a pastebin in the OP and the link is not dead yet.
I listen to a ton of Morse code mp3s in my car hifi

Everyone asks "K3ABC, do you copy?"
But nobody asks "K3ABC, how do you copy?"

>>2595706
Almost all ham radio operators are at minimum obese.

>glow harder

>>2595932
There's a daily news podcast in Morse which I have found the best, but my motivation comes and goes.
I tried the Koch and pastebin links and a few other techniques. I hit a plateau and walk away. That's my personality trait when learning.

Came over from /k/ looking for comms info. I know little about radio and broadcasting, but I was thinking about getting a Baofeng (yes I understand it's a joke) or something along those lines. What are the capabilities of those handsets? It would be nice to have something to just grab out the door and keep with me in the car for... anything really, even bored listening, talking at trucks/farm equipment. Wouldn't mind having CB of course, but is there anything that reaches to HAM range? Anything that reaches some interesting bands? What kind of modifications would improve it while keeping it mobile? I live out in farmland so I do have somewhat of a justification for having one.

>>2596146
kys larper

>>2592486

Hello, looking for a handheld back up walkie-talkie to carry with me in my plane.
Yes I am a licensed pilot and I have a radio license too. What is a good reliable recommendation please? Thanks in advance. @lilliumjet on Telegram reaches me if this thread dies.

You see what 10kw on a very tall antenna gets you with your local broadcast TV and FM stations.

>>2596146
CB is HF, 27MHz, same as the 10m HAM band, 28-29.7MHz, so you can do the same thing, NVIS, long distance, ground wave.
There are handled CB for very short distance communication but you can also use a UHF on PMR frequencies for this purpose (446MHz)

>>2596182
there's that but it's not cheap
https://www.icomamerica.com/en/products/avionics/handheld/a16/default.aspx

>>2596146
You are going to need multiple HTs for what you want. If you was going to just listen, get a Yaesu FT2D, FT3D, or FT5D since these can listen on HF (exceot SSB). For talking on CB/10m ham band, you'll need at minimum a mobile rig since AFAIK there hasn't been a commerical 10m HT produced in a long time. Almost all HTs can transmit on the 2m and 70cm ham bands.

However, if you want ultra portable that can pretty much do-it-all, look into the Icom 705. It's not an HT like a Baofeng, but it's a QRP (low-power) radio that can transmit on all amateur bands, and it can be MARS modded to talk on other services like GMRS and CB. Pic related.

Inb4 that Icom705 is junk pic.

>>2596229
Icom 705 is overpriced junk. Saying "inb4" doesn't negate it.

>>2596255
>buy an Aliunce HS1 and a baofeng then tape them together
Into the trash it goes, actual brainlet content

>>2596229
>>2596255
Why not Elecraft KX2 or KX3, of Yaesu 818ND?

>>2596007
Why do they wear the bibs?

>>2596339
Emergency LARP hams are the worst kind, you'd expect just any kind of annoyance coming from them

How much more capability am I getting taking a leap from a baofeng UV56 to a yaesu VX6r?
Application would be for LARPing, general comms, SHTF

>>2596007
Why are the two at the end wearing high vis vest if they already have high vis on under it

>>2596362
Since the text differs, it is fair to guess that someone brought in the high vis vests afterwards.

>>2596007
>obese
No: https://youtu.be/b9S-NzsUD5w

>>2596146
I use one in my truck. The receivers are garbage and overload quickly, and it's extremely sensitive to multipath. That said, it's cheap and out of the way so I don't have a second mobile radio in my truck (I have one for 10 meters as well).

>>2594111
Because that's usually what propagation allows. I use a 6 element Optibeam positioned 40ft up on a tower and very rarely will I ever get close to 30 contacts, even on ft8, into asia in a single day on 10m. That's coming from Norcal too, so I have a good position for it. 15/20m I can do it pretty easily.

Unlike what people who have never touched HF radio in their lives like to think, ft8 and other data modes are not some sort of magic propagation-beating modes that can do whatever the fuck they want, not even WSPR. You must have the propagation to allow signals to reach.

I have a pretty impressive setup too. It's far from what some of the big boys run, but a 6 element triband beam with no traps for loss and great front/back is more than what most hams could ever dream of. So don't stress you don't get 30 asian contacts a day. Most of us won't until the solar cycle peaks.

https://www.tindie.com/products/hobbypcb/cm108-to-baofeng-interface-pcb/

Sure would be awful if someone setup the ai biden voice mask to troll ham boomers via their computer to a baofeng.

>>2596431
Why a baofeng? It'd be amazing on HF frequencies where literally thousands of people are listening, instead of a small local group in a 15 mile radius.

>>2596349
>yaesu VX6r?
You can use it in any weather

god i hate handhelds and id collect even HF ones. use a satellite phone or setup a decent fixed antenna on HF, or use repeaters if you must use a handheld.

handheld to handheld has as much range as an airhorn or a mirror.

>>2596349
It can actually hear shit and you get the extra 1.25m band (6m too if you MARS mod it)

Still backtracking for errors, tx anode won't get voltage and rx doesn't oscillate

TX works now, found a bad connection, next I have to fix the receiver.

I need to know this, I've looked everywhere on the internet, but to no avail.
Has there ever been any 2 way VOICE transmissions below 500khz?
Like pirates you find transmitting all over HF?

>>2596729
630m band is close, but because power is so restricted it'd be hard to say. I'd assume it's typically best used with data like wspr.

>>2596734
So no AM/SSB voice transmissions?
Just data?

>>2596729
You can, it's just not very efficient. You need about 3 kHz for intelligible human speech (hence why you're seeing efforts to get codec2 implemented for digital voice) it's easier to use digital modes instead.

>>2596740
You'd take up half the band for a ssb transmission, but it's technically allowed as long as you don't go out of band.

Also
>5w erip max

>>2596146
I'm a /k/ and ham extra.
It sounds like you've dipped your toes in the water, but gave a rather detailed question that's too subjective.
In /k/ terms, you said
>guns look cool, which one is best
Now we have to back up and ask what application then we can talk shotgun/rifle/handgun.
If you just want to hear people talking, honestly I'd go with a phone app.
If you want a Baofag, get one. I have one and connected it to my ear pro so I can talk to others at ranges without screaming over each other. They have a limited range/use.
Now we have to back up and ask what application then we can talk

>>2596315
Why not a cheap SDR if he isn't a ham and never expressed interest in transmitting?
>>2596255
I made that at work and had a heartful chuckle of the memories.

>>2596910
>I'm a /k/ and ham extra
It's called amateur extra so I doubt it.

>>2596943
>He didn't use my approved terminology!!! REEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!

>>2596998
Yeah, but it's clear you're not an amateur extra.

>>2597029
I'm really stoned and thought he was making a "hamateur" extra joke

>>2597029
>>2596943

>>2597050
Wow! It's a.. Uh... Nothing.

So I get a 9:1 unun, what length wire do I get to txrx on 160-6m bands, also what kind of wire? Would a counterpoise be recommended?

>>2597055
>You're not an Extra
>You're not an Extra
>So what? You're an Extra

>>2597064
>So what? You're an Extra
But you aren't.

>>2597068
>>2597064
>>2597055
>>2597050
>>2597044
>>2597029
>>2596998
>>2596943
>>2596910
Your mom is Extra fat.

>>2597059
>160-6m
There isn't a magic length, despite what most guides on random wires will tell you. For 160m, 135ft.

>wire
Any. It's called a random wire for a reason.

>counterpoise
Experiment. I found 17ft works the best in my location. Any more worsens my Tx signal. Any less and the SWR goes up even with a tuner.

>>2597055
>REEEEEEEEEEEE HOW DARE YOU PROVE ME WRONG!!!!!!!!!!
Go complain about it on 80m, OM.

So I'm thinking about getting a VX-6R... and then I've discovered that it's been discontinued and that any new units are marked up to the ceiling in price.

>>2597197
>>2597118

>>2597118
don't talk about my mom's wavelength that way.

>>2592486

>>2597312
Your mom resonates only on 160m.

>>2595458
After watching comparisons I want one too. Can I use wood rods for the legs? Are there pre-made bases you might recommend? Also, what mast?

>>2597570
I'm glad you asked!
>legs
Any non-metallic material that won't react with the wire will work fine. You'll contact some people in south america, asia and africa that use wood and bamboo all the time. For a mono-band antenna, lightweight solid wood elements can't be beat, especially if you treat them properly. Don't use untreated wood like some closet rods or plywood rods you find at home depot, make sure you weather proof them. Swelling under the tension of the hub and wires can cause them to crack, or at least shorten their lifespan. Don't worry about metal at the hub or for the mast, it's primarily the wire you don't want getting messed with.
>pre-made bases
If you check OP pic and the pic you replied to, I replaced the hand-made hub with a KIO hub. I cracked the first one (cut out of old cutting board) and I'm not dexterous enough to measure and drill the holes in a sheet of aluminum. I used the same wire and spreaders, although slight adjustments needed to be made to the spreaders. Get your measurements online and make sure you use the measurements for the type of wire you're using. It's pretty damn easy to cut and fit everything together.
https://www.hex-beam.com/specs/
>what mast?
I made the mast with EMT pipe from home depot. They sell 10ft sections, I then placed each section 3ft into the previous one. For simplicity, I drill the first hole for a place holder bolt. I then drill a second bolt through both masts. This allows you to take everything apart and put it together in the air. Same thing with the top section, drill a guide bolt 3ft down into the "outer" mast, place the inner mast, then drill a retention bolt through both. That way you can also rotate from the ground level without setting up a rotor. Even if you do decide on a rotor, you want the mast secured in place when you're not turning things.

>>2595458
Oh hey, I remember when you tried an Arrow J-Pole and then went with the Diamond instead. What is that other thing?

>>2594607
Lots of metal in the air but ultimately you only get 2 elements per band for all that weight and it looking weird shit. Just make a Hexbeam or nested Moxon

>>2597620
A hexbeam for 10m. It's about to change because I passed my general today.

Guy from the /k/ thread, I just got the very last non-ebay Yaesu VX-6R from theantennafarm(dawt)com. Browsing peripherals now. One of those things where unless you want a used one (seemingly always filled with crumbs) you have to get it now before it's gone.

>>2597834
You know other quality radios exist. Such brands include Icom, Kenwood and Alinco.

>>2597834
>2m / 440 handheld
Who gives a shit?

>>2597907
It also does 220 & 6m you fucking retard

/g/ tourist, i understand what a ham radio is, but can someone point out what's the catch?

and also books that'd help me write the operator qualification exam?

>>2597976
>>2598013
die in a fire

>>2592486
I know it is not /ham/ but i still think is the best place to ask
How it is called the connector used for external antennas in phones? my xcover4s has one, it is the same as old dumbphones apparently
The beancoutners on my local phone company have decided that they won't pay to repair our local 4g antenna as the government is mandating new ones that need to be deployed in a year or two. And knowing them we would be one of the last to get the new one.
I just need to be able to call and get internet inside the house near my work desk, the house walls are thick rock ones, so an antenna and a meter of coax cable would be a good idea for a temporary arrangement. I do get good signal in the street

>>2598013
Check the FAQ

>>2598065
>How it is called the connector used for external antennas in phones?
I don't know for sure but SMA is my guess. There are many possibilities, check out this list:
https://uk.rs-online.com/web/content/discovery/ideas-and-advice/coaxial-connectors-guide

>>2598065
I'm not sure what you're referring to when you talk about an external antenna for the xcover4s, but it sounds like what you're looking for is a "cell signal booster." It would have an antenna for cell signals that you'd put outside or on your roof, a unit that goes inside the home that amplifies and retransmits the cell signal, and a coax cable to connect the two.

>>2598013
You're not going to get any help acting like.
>Why do I get started and how
Ham radio is a broad collection of hobbies that revolve around communication.
Each country has their own requirements. Do a little leg work.
This may help
https://www.youtube.com/watch?v=wt5wZhC5crI

>>2598090
>>2598088
thanks a bunch

>>2598013
>what's the catch
I am quite happy to speak to people around the world directly, relying on nobody else than the two of us.
A very tiny portion of the electromagnetic field generated by my antenna is actually picked up by some random guy's antenna on the other side of the continent of the globe if I am lucky and we can talk.
It blows my mind every time.

>>2598088
I mean the one next to the sd card see picrel. I know that some of the industrial supports used for this phone has that connector. But they don't sell those to individuals. And samsung doesn't tell customers about those, i tried.
>>2598089
>"cell signal booster."
those are very expensive, overkill for what i want, and while nobody bothers, illegal where i live.

>>2598127
it's for testing the mobile phone before it is packaged in the factory
Chances are it is a OSMT/SSMT connector from the link the anon >>2598088 gave
or maybe it's a U.FL, UFL, IPEX, IPAX, IPX, MHF, AMC, UMCC (they are all the same thing) but these are used on wifi boards in laptops usually, you click the cable and it retains it, on the phone, it would be surprising because it is used once for testing.

>>2598127
Fuck there are a lot of them
https://lcantennas.com/product/ufl-rf-connector-pcb-mount-coax-terminal-ipex-rf-connector/

>>2598107
He's from /g/.
He gets his rocks off having computer code and copper wiring making his life meaningless.
A lot of parallels with /ham/ but different personality. He wants to be spoon-fed new toys so he doesn't have to do anything.

>>2598135
this is an "industrial" phone. I am pretty sure that connector is used on custom made cases.
>>2598137
>Fuck there are a lot of them
I know. I was hopping maybe some anon knows.
The only hint i have is that i was told that old brickphones had the same one. I remember that there was a connector next to the antenna behind a cover in my old motorola. But i don't even know if its true
I may buy several cheap ones in ali, and just try them out.

>>2598153
the connectors for external antennas on old phones were way bigger, like MCX and above.
I don't think there are custom cases with embedded antennas ? That would be neat but I am not optimistic about that

>>2597196
You only have one counterpoise wire?

>>2598153
>this is an "industrial" phone. I am pretty sure that connector is used on custom made cases.
Many old phones have these connectors, including my old Samsung Galaxy S3 (the phone in >>2598127 is probably a more recent Samsung) and also my old Sony Ericson P1i (cover barely visible up left from the camera).

I opened my P1i and it looks like SMA male, about 4 mm across.

>>2598013
I can tell another nerd to go to another frequency instead of channel and talk since no one around here monitors any other frequencies: just channels on public services (CB, FRS) or repeaters/national simplex frequency (e.g. 146.520Mhz). No need for encryption or privacy.

Any recommended SDRs that can receive at 2.4GHz? Maybe 5GHz too. I want to measure signal strength of wifi from a series of different antenna topologies. Something like a HackRF One would be nice, but I don't really need the TX function.

>>2598517
PlutoSDR delivers up to 3.8 GHz:
https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm-pluto.html

>>2598641
>PlutoSDR delivers up to 3.8 GHz:
6GHz with the "hack" (basically SSHing into the pluto and editing a config file)
https://www.rtl-sdr.com/adalm-pluto-sdr-hack-tune-70-mhz-to-6-ghz-and-gqrx-install/

Someone give me funny ham pics to send via sstv. I'll post.

>>2598745
Perhaps 10m isn't going for it today, but I can do 15 and 20 as well. This was cross-country with no amp, 30w. I avoid going to 100w because it seems to drive my radio too hot because it's a constant duty cycle on ssb.

>>2598749
kek

Just an update: (tr)uSDX has now a beta release firmware that gives you waterfall display. It is impressive what they can get out of the processor but I hope the next hardware will have a DSP added or a more powerful processor.

How much more damage are you all causing trying to "help out."

>>2599164
>get a ham radio
>emergency situation
>turn it on and listen
>lots of busybodies with no idea of what to do just being loudmouths
>panicking hams with as little idea of what to do
>take notes of locations, stashes of fuel and food
>pay visits to them for own sustainability
It's really that simple. Just be a good listener.

>>2599179
>get a ham radio
>emergency situation
>turn it on and listen
>lots of busybodies calling cq with no idea of the emergency in your area
>hams either don't know how to help, or don't give a shit
>EXCUSE ME THIS FREQUENCY IS IN USE, CQ DX CQ DX KILOWATT AMERICA 4 CHARLIE NOVEMBER PAPA
>don't visit anyone because everyone you receive on HF frequencies lives 2,500 miles away
It's really that simple.

>>2599182
>emergency situation
>EXCUSE ME THIS FREQUENCY IS IN USE, CQ DX CQ DX KILOWATT AMERICA 4 CHARLIE NOVEMBER PAPA
kek

>>2599164
I got into ham radio so I could use digital modes to send pepe memes home when I don't have internet access.

Does anyone have some recommendations for a 17m diy, backyard, DX antenna design?
My 17m numbers pail in comparison to 20m and 15m.
Pic unrelated.

>>2598745
>>2598749
Come on I need more dank memes for slow scan.

>>2599452
On RX today.

>>2599452

>>2599452

>>2599452

I figure I could ask here. Does anyone know how long it takes for the FCC to make applications public? The applications here from 2021 are public, but the later ones from 2022 aren't:
https://fcc.report/company/HawkEye-360-Inc

What freqs are you guys listening to for SSTV

>>2599572
14.230 MHz on 20m, sometimes 14.233 MHz
On 40m, I don't remember hearing SSTV on a specific frequency

>>2599599
>14.233 MHz
>On 40m
Huh?

>>2599654
That's two separate lines.
On 40m I don't remember what frequency is used

hey guys looking for some info from those in the know.

i had these walkie talkies as a kid in the early 90's, mine were the ones on the left, tho the right ones look identical just different branding.

my knowledge of radios is zero. i remember playing with these with my grandad as a kid, i always did s.o.s on morse code.

one day someone came thru on it, i remember there was a load of background noise and i couldnt make out what the guy was saying, there was a small airfield about half a mile from my grandparents house, i was either speaking to someone at the airfield or someone in a light aircraft, it only came thru on my set, not the one my grandad was using, my grandad took the talkie and spoke to them, he was ex navy so knew the jargon.

my question is how do these talkies work? are they single band/channel vhf? why would an airfield/aircraft be on the same channel as kids walkie talkies? who would i have been talking to do you think? aircraft? airfield? could have been coastguard or ship as we were right on the coast. or an airliner? and why did it only come thru on my set as where my grandad was he was closer to direction of the airfield

what do u guys think? what are the range on these things, they are labeled as MPT1336 whatever that means, another page i found said MPT1336 are 49mhz and work upto 1/4 mile.

who can u speak to with these things? cb radio, vhf radio, ham radio? i remember a lot of background noise and i couldnt make out shit, reminds me of the radio my dad has on his boat.

also do modern kids walkie talkies work in the same way, or have they changed the design due to legislation to stop you picking up signals you shouldnt?

would really like someone to explain all this, it happened when i was 7yo that was 30yrs ago, ive always wondered.

>>2599741
>they are labeled as MPT1336 whatever that means, another page i found said MPT1336 are 49mhz
It seems it was a band allocated to devices with low power and no license :

http://www.dustygizmos.com/arcpages/arcphones.htm
The ‘licence exempt’ portion of the 49MHz band, known in the trade as MPT 1336, was introduced in the mid 1980s. It was set aside for low-power devices

Maybe it's a band also used by aviation, navy, it depends where you are. Also these devices, being low cost, may have poor filters and radiate on other bands nearby.

>>2599741
>do modern kids walkie talkies work in the same way
They are on a dedicated band for low power devices, the same as yours, a lot of them are on PMR 446 Mhz but not all of them.
49MHz x 2 = 98 MHz, in the FM broadcast band, nobody will answer there
49MHz x 3 = 147 MHz, that's the end of 2m VHF HAM band, maybe a HAM heard the SOS

>>2599755
>>2599760
thanks for the reply guys, really good info. just checked google earth in a direct line from my grandparents to the front gate of the airfield its 1500m/0.93miles, the tower was prob another 500m or more away, which puts the range around 2000m or 1.24 miles, thats if it was the airfield, its on the south coast of uk, literally on the seafront overlooking the solent across to the isle of wight, their house is like 500m from the water, so it could have been a ship/boat 500-1000 metres off the coast.

i assumed all sets were paired and only worked over short distances like 20m, i didnt know you could pick up other signals from other radio equipment and at such a great distance, if it was an aircraft or even a ship it puts the range at at least 1500-2000m or 0.93-1.24 miles, not bad for a kids toy.

>>2599789
>i assumed all sets were paired and only worked over short distances like 20m,
They were all on the same frequency apparently, something lie 49.65 MHz and the range was "1/4 mile" at best, power was limited to 10mW on that band

>>2599741
49MHz is mostly used for baby monitors and and also toy walkie talkies like those. Maybe one or two more serious HTs have ever been made... You're limited to a handful of mW so it's not very useful. You either came through someone's baby monitor or their toy walkie and they were fucking with you. That or you were talking to a freebander.

Is it normal I feel like my head would explose when transmitting an image in SSTV at 100W ?

>>2599476
hey!!

>>2599825
it was back in 1992/93, definitely wasnt a baby monitor or another walkie, who ever it was i could tell it was a professional radio operator by the way they were speaking, it wasnt just someone fucking about, as the other anon said they were probably replying to me morse coding s.o.s, i remember my grandad grabbed the set off me to reply everything was ok, the signal was clearly very weak as there was a lot of background noise and i couldn't make it out, the local airfield at the time was just for light aircraft to pull gliders up, so i could have been talking to someone in the air either taking off or landing, it had the same kind of sound as a radio u would hear in an aircraft, very noisy.

i remember them saying it was air related, just not sure if it was airtower or aircraft, i didnt think a kids toy could interact with professional radio equipment.

also this reminded me i had an old guitar amp that picked up some french radio, think it was the one in pic, my friends were messing with it, they had it on full volume, the guitar lead i had at the time was one of those coiled ones, im guessing it acted like an antenna(wasnt plugged into guitar), the voices were barely audible but distinctly french, it sounded important like naval ships relaying info back and forth, not just two guys having a banter.
from where we were on the south coast uk, its 70miles straight across to the french coast.

i remember one of those friends tried it out with his guitar amp, i think he opened his up plugged in the guitar lead and with the other end he started poking components till he picked something up.

how is it possible to pick up transmissions with a guitar amp do they have components inside that can receive signals? we though it was strange it was french not english if it was a french ship in the english channel they would be at least 35miles out. someone please enlighten me.

>CQ CONTEST
>CQ CONTEST
>on SSTV freq
good luck with that buddy.

>>2599907
Which band? I'll stomp him lol

>>2599915
14.230, I am in yurop, they are gone, poor guy ears were obliterated by some med broadcasting naked women at 1kw.

>>2599917
Ah yeah, I don't get into Europe very well with sstv. Need to hop twice.

>>2599920
SZ2T, Greece HAM club, seems to be beaming West, maybe you'll catch them, they have a yagi antenna.
With a wire antenna I can't go outside Europe

A friend wants to try hell-Feld (hell Schreiber variant), looks fun and maybe it can reach farther.
There's a guy who put all (ALL) the information available on that on his website
https://nonstopsystems.com/radio/hellschreiber.htm
I read some pages on the train when I commute. fascinating

>>2599906
There were higher end/non toy walkie talkies that used those same frequencies on 49 MHz. I've seen them come up at thrift stores every so often. They included features like having a channel selector for 5 or 6 different channels.

>>2599906
>how is it possible to pick up transmissions with a guitar amp do they have components inside that can receive signals?
How is it possible for the speakers of my computer to pick up my voice modulated in SSB when I emit and somehow demodulate it ? And only on 40m.
because they are part of a circuit that somehow is vaguely tuned to that frequency, as you said, coils, length of the wires, a lot of things participate in that.

>>2599923
You should get out fine on a dipole or wire, how high is it? Needs to be a half wavelength above ground level or it'll NVIS.

>>2599934
I am in a valley, so I can't beam to low or it will just bounce on the hills nearby. The horizon is at 20-24°
I make good contacts eastward on 20m, the antenna (an end fed) is setup just at the correct height for that and the valley is opened toward East.
I am thinking about putting a static directional antenna beaming East and contacting everyone there and trying long path for the others.

Anyone try out spoopy sstv?

>>2599945
Got any more?

>>2599906
I saw this on SWling Post and thought some might find it an interesting read: https://madpsy.uk/link-between-the-soundtrack-of-the-exorcist-and-amateur-radio/

>>2599825
>circa 1988 and an old PRC-77
Brings back fond memories of cordless phone shenanigans. :-)

Being in western Canada the only decent 49 MHz radio that wasn't geared towards kids 10 and under, was the Radio Shack TRC-512 5 ch units. Reported to be 100 mW power but range was about a couple hundred feet in an open field. i didn't know it at the time but it had an innefficient antenna.

Once chock-full of signals, now nothing. I haven't monitored a signal in that band since around 2000.

>>2600296
good find. that explains exactly what was going on with my guitar amp. they were picking up signals from an antenna 37miles away. i was sure i picking up french naval transmissions from out in the middle of the english channel, the half way point is around 35miles, so same kind of range, give or take a few miles

if I want to estimate the leaked EMF from a cylindrical faraday cage that's shielding a helical antenna (meaning radially polarized EMF), but all I have is a linear dipole, how much power can I expect to miss?
Is there some relationship or equation I can use to estimate the total power of a radially polarized signal based on a linear polarized component?
Would bending the dipole into an L configuration allow me to pick up more of the signal?

>>2592486
I've always fascinated by this hobby (actually, I'm more fascinated in the fact that it's a hobby at all)
what do you fellas actually do? Is the point getting it all to work properly, or... what exactly?

I'm not trying to be a jackass I'm curious, it certainly looks cool

>>2600696
>what do you fellas actually do?
trying to talk to people around the world (without setting the house on fire)
I started to use Feld-Hell, it's a mode that transmits text that can be printed really simply but everyone uses computers now, picrel.
I do SSTV (transmission of images) sometimes, but mostly voice. Some are proficient in Morse code (it's very effective)
But transmitting is only a part of the hobby, tinkering with electronics, antennas is also a huge part. I have to renovate an antenna, put more coaxial cables to the garden, do some portable operations with a friend during spring and summer, a lot of things

>>2600706
>Feld-Hell

>>2600706
neat!

>>2600696
listen to the aging remnants of the original HAM era discuss their failing health, surgeries, and deaths of loved ones on the HAM bands
hit-and-run transmit borderline SFW furry art over SSTV and hope no one can triangulate me (they haven't gotten me yet)

>>2600814
based
now you gotta move onto the extremely NSFW kind, it's the only logical next step

>>2600814
>original HAM era
Even the oldest boomers are not even close.

>>2600814
>zoomer moment

SOmeone was talking about learning CW/improving CW wpm via a hypnosis mp3 some site sells for $20. good or femoid nonsense?

>>2601124

>>2601124
>femoid nonsense?
At least your guts have their compass left.
You can download training mp3s for free and listen to them on your commutes.

RETIRED RF ENGR 2WAY AND CELL SERVICES . FIELD CONSTRUCITON MGR. ALSO RETIRED FROM FEMA US&R MASS TASK FORCE 1

REGISTERED CERTS INSTRUCTOR

VI AND VE , RACES, ARRL MEMBER. AM RED CROSS, HOLD 35 CERTIFICATIONS WITH FEMA DISASTER SERVICES .

READY FOR MOBILE OPERATION WITH 37 FT CLASS A MOTOR HOME

This is not a joke

>>2601189
>HOLD 35 CERTIFICATIONS WITH FEMA DISASTER SERVICES
They're free online and just require clicking. Nobody takes them seriously.

Fast scan television test run from north of the speedway into mount Potosi repeater. (Mostly) successful, with minor audio issues. Because the towers are decommissioned, we have access to the site and even have authorization to use the 240ft towers for ham radio before they get demolished. You might hear us on 160m on Saturday nights getting into a damn good chunk of North and South America.

>>2601201

>>2601202

>>2601204
W-w-w-will it tune on 11 meters?

>>2601211
it will tune on 2200 meters to 13cm

>>2601201
>>2601202
>>2601204
nice work anon, I hope the 160m activation goes well

>>2601211
It's possible, one of the dx guys was half-joking about trying it this weekend. Without really good impedence matching, we can't run the amplifier though. Higher frequencies also build up a LOT of static, so we have to short it regularly. You'll hear the damn thing crackling. I doubt you'd be able to troll for very long on cb with it, but a quick keydown wouldn't hurt anything.

>>2601226
It worked great last weekend on 80-75m and 160m. We only ran 100w through it and spoke all over the US. Receive was an issue but we have a fix for the static buildup long-term now. We'll be running full legal this upcoming Saturday, if equipment allows us to.

>>2601231
>the static buildup
That's an interesting problem, isn't that thing >>2601202 to avoid that ? Or is it just for surge, lightning ?

>>2601234
Yes, that's called an Austin ring transformer and is used for shorting the tower when it builds up static.

>>2601201
>before they get demolished
What? My man, are you not going to BUY these?

>>2601240
>Austin ring transformer
Aviation regulations require that radio towers have aircraft warning lights along their length, so the tower will be visible to aircraft at night.[2] The high voltage on the tower poses a problem with powering the lights. The power cable that runs down the tower and connects to the utility line is at the high voltage of the mast. Without protective equipment the current from the mast would flow down the cable to the power line ground, short-circuiting the mast. To prevent this, a protective isolator device is installed in the lighting power cable at the base of the mast which blocks the radio frequency power while allowing the 50/60 hertz AC mains power for the lights through.
Neat, so it's the shiny spikes with the spheres at the end that can evacuate static ?

>>2601241
I tried, they have another 100ft of tower elements on the ground that are getting shipped out or scrapped. They won't sell them to me. Damn did I try. They also have some 6ft microwave dishes I wanted and they won't give them up either.
>>2601242
If I'm not mistaken, you touch the, uh, balls to short the tower.

>>2601241
Also, they're not aluminum amateur tower sections. These bad boys are solid steel. They have them just laying out there, anyone could drive up and take them, but they'd be a bitch to set up. I only wanted 40 feet.

>>2601230
Based. Have fun, anon.

>>2601230
For higher frequencies could you not ground it through an inductor to drain off the static while blocking RF?

>>2601211
>W-w-w-will it tune on 11 meters?
You just rest your neck

>>2601243
>balls
That is for when it gets hit by lighting or a nearby strike generates excessive voltage spikes on the tower.

Replaced the dipole.

>>2597050
>posting a picture of someone else's license they paid $50 to someone on etsy to etch out for them like it's some prestigious thing
lol. lmao.

>>2601797
>likes ham radio
>lives under power lines
checks out

>>2601924
It's such a pain, but finding a good home out here without power lines, a decent yard, and no HOA is damn near impossible.

>>2601927
at your price point maybe

>>2601948
shut up faggot
the cuckshed in your parent's back yard doesn't count

>>2601948
I'm not
>>2601950
Yeah, I'm not exactly rich. It's comfy though, and I'm allowed to enjoy hobbies within reason here. Also >>2601950 is right.

>>2601927
You do what you can, anon. Your monoband hexbeam is nice

>>2601231
How about 630m and 2200m?

>>2601246
>I only wanted 40 feet.
My man, this is a critical lack of ambitions. What I want to hear, is your plans to use these for a two ring Wullenweber tuned for the 630m and 2200m bands.

>>2602055
630 and 2200 are fairly dead. You must keep power below 5w (or 1w) eirp, with respect to a dipole, and if you use any other antenna you need to keep track of its gain.

>>2602183
>>2602055
You also need to register with the Utilities Technology Council and I think the 2 bands are mostly used for data anyway.

>>2602055
>use these for a two ring Wullenweber tuned for the 630m and 2200m bands
My man, this is a critical lack of ambitions. What I want to hear, is your plans to use these for a 50 kW medium wave broadcast station.

I've been watching a few videos about building baluns, and I had a question about adding capacitors. A few times now I've seen someone add something like a ~3000 picofarad capacitor to the balun to help lower SWR on the higher freq HF bands for the antenna it was being used with. Without the capacitor the antennna would have great SWR on 80-60m, but would climb into less usable ranges at the higher bands. Is using a capacitor to help pull SWR down a hard and fast rule? How do I know how many farads the capacitor needs be rated for? I feel like I should just bite the bullet and buy the AARL antenna book because it'd answer these sorts of questions.

>>2601927
Throw a copper wire onto the power line, make a 500dB 60Hz notch filter, and use the long power wires as an ELF antenna for picking up submarine comms.

>>2602291
Just calculate the complex impedance of all your components, simple as.

>>2592593
Not everyone is licensed.
A warehouse around here operates a repeater without a license.

Hey guys, /k/ noob here. Anyone know of a PTT that will take an invisio downlead? I'm trying to use it for a 2 pin baofeng.

>>2602698
search invisio on aliexpress, there are some. Is it that kind of thing you want ?

>>2602702
That may work, I do know the baofengs require an amplified ptt so if the invisio ptt takes a battery I should be good. Now I gotta figure out which invisio ptt to get, and that cable you shared looks perfect to interface the radio with the ptt.

>>2602675
>doubt.jpg

>>2602698
>>2602702
>>2602709
>gay.jpg

>>2602741
Whats a better alternative? I'm trying to up my earpro game but I thought baofengs were a good radio for short distance los propagation

also here's the current /k/it setup for a baofeng and a disco32 amp ptt for a u174 nato downlead

>>2602765
>>2602767
join the military and stop larping

>>2602765
>>2602767
>LARP gear
What's even the point of this shit? Just get some plastic play pretend shit off aliexpress and fill it with sand for weight.

>>2602788
>>2602790
What's wrong with larping? Real life is larping.

>>2602800
Real life is doing. That shit is only good for LARPing.

>>2602788
>>2602790
>>2602802
been there done that, but thx for the concern. was an RTO/Raven/InstEye operator(not leet opr8r just a grunt) but I suck at civilian comms.

>>2602802
>implying that the military is real life
The gentleman just wants to plug his chicom walkie talkie into his ear pro and mount it on a tactical camouflage fanny pack. Nothing wrong with that. And while you guys were busy playing international phone sex with the most expensive communications systems in the world the Russians rolled their BF-888S's and cheap ear pro into Ukraine...

>>2602819
I'm just using them for range toys/camping/etc. Nothing serious. Worst case scenario I bought a pair of hearing defenders for 300 bucks

>>2602819
>the Russians rolled their BF-888S's and cheap ear pro into Ukraine
Considering how poorly that has gone, exactly what point are you trying to make here?

>>2602823
Incredibly based.
>>2602829
I am just teasing you about the suggestion that the military isn't mostly larping. If you don't like that example then there are plenty of other hilarious military comms stories from throughout the history of radio. But I am sure that you know these stories already, given your super serious education on the topic.

>>2602805
don't care

>>2602805
US MARINE CORE - SEMPER FI - 1966-1967
Sent from my iPhone via Tapatalk.

>>2602819
>Russians
Speaking of which, Russian spy ships are apparently equipped with the " Б3-28" HF radio.

>Here comes the LARPERS again

Anyone else raking in the dxcc points with all the dxpeditions? I lost track but there are at least 6 active.

>>2603331
ham radio and adipose tissue, name a more iconic duo

>>2603386
Gastrointestinal issues. I swear every time I tune around the local repeaters it's some boomer talking about their most recent battle with gout, IBS, or something similar. What's ironic is the weekend I passed my technician exam I ended up in the hospital the next day from developing an ulcer. Now that I have been marked I may transmit on the airwaves unmolested.

>>2603390
Get your general and get on the low bands. Dx is where it's at.

>>2603390
>local repeaters
Just wait until you get your general and get onto 40m and 80m.

>got 0-to-extra 2 years ago
>haven't keyed up once yet

>>2603408
What's your callsign? I have an old ft-847 that works fine you have just have. Just order a cheap handheld mic and make a dipole antenna or 2 and you'll be on all bands.

>>2603409
>doxing myself
i probably hate participating in this hobby because im a privacy freak... maybe ill just make up a callsign.

>>2603411
Don't give out your callsign on here. There was a guy here, Patrick, that did get doxxed.

>>2603411
Yeah it was obnoxious to go out and get a PO box just so assmad hams can't dox me for whatever retarded reason they may have. Apparently there are online services that will also do address masking for ham radio but I've already got my PO box so oh well.

>>2603457
>>2603546
Pointless in my state. Voter registration shows my address and is readily available online.

>>2603566
My state has the option to lock online voter registration info behind 2FA thankfully.

>>2602183
>630 and 2200 are fairly dead.
... or in need of more sensitive equipment?
>You must keep power below 5w (or 1w) eirp, with respect to a dipole,
Is that per dipole in the array?
>and if you use any other antenna you need to keep track of its gain.
That might depend on the definition of antenna.

>>2602184
>You also need to register with the Utilities Technology Council
Why?

Anybody here mess with slow scan?

>>2603390
Kek

There's a well known 2.4 GHz digital module which is widely used in most of those diy rovers/small drones/etc applications called NRF24L01. The chip itself has an output transmitting power of 0 dBm (1mW). There is also amplified version of the module with PA and LNA which outputs 20 dbM (100mW) on picrel.

Now my question is, is it possible to use this chip with another more powerful amplifier chip? Or the amplification factor is a limited thing and it would be impossible to amplify it further and I would need to have more powerful transmitter chip in the first place?

FCC may go fuck themselves by the way.

>>2603848
There are almost certainly aliexpress 2.4GHz amplifiers you can buy. But I'm not sure how well they play with a system that transmits and receives through the same antenna. Look at the schematic and datasheets, I'm guessing there's an analog multiplexer (at RF so probably made out of diodes) directly on the antenna. That or the NRF is just able to eat the amplified input and ignore it until you shut it off to RX.

>>2604043
Nah bro, I'm not buying anything but doing the PCB myself. Similar to the one on that picture but with higher amplification factor. I need to know if it's possible to amplify the low power transmitter 0dBm to much higher gain like 30dBm or it will not work because RF reasons.

>>2604095
Same principles apply. Look at circuits of existing solutions and see where one gain stage could be substituted for another.

>>2604126
I already did, the schematics and PCB part is not an issue. I ask about where it's possible from RF standpoint to amplify weak signal a lot.

>>2604127
Can't see any problem with adding lots of gain to a weak signal. You end up also amplifying the noise, but the SNR isn't really a limiting factor of a transmitter anyhow.
>2.4GHz pcb design
lmao good luck

I cannot find a solution to this problem after hours of searching. Can you help me, /ham/? I want to make a slim jim antenna from scrap 400ohm ladder line for 6m, and either 2m or 70cm (which one doesn't matter.) I cannot find any plans that will make it dual band on 6m and 2m/70cm. Is this even possible? I know there are triband antennas available, but I would like to make it if possible.

>>2604131
> Can't see any problem with adding lots of gain to a weak signal. You end up also amplifying the noise, but the SNR isn't really a limiting factor of a transmitter anyhow.
Nice. Does it mean I could theoretically stack a bunch of amplifiers one after another if I'd not care about power consumption?
> >2.4GHz pcb design
> lmao good luck
Thanks, it's already done btw, as I said it's a popular module.

>>2604134
>Does it mean I could theoretically stack a bunch of amplifiers one after another if I'd not care about power consumption?
Each stage will introduce its own noise, so generally I'd want to have one high-gain stage, as opposed to a bunch of low-gain stages.

Just a reminder that this Friday is Morse Code Day.

>>2604181
Every day is Morse Code Day if you're no no code retard

>>2603848
What is te legality of using these for a link? I was thinking of a point-to-point direct line of sight 10 km link that needs better tan 1MB/s bandwidth.

>>2603848
I know nothing of drone technology or small chips, but typically you can amplify a signal as much as you like multiple times over. The trick, I'd assume, is to ensure distortion doesn't happen between amplifiers, and bandwidth doesn't change between transmitters (you don't want a wide banded signal trying to communicate with a narrow banded receiver, for example. At least not for data like this). The whole point of a linear amplifier is to amplify while retaining the original signal.

All that being said, it might just be easier to drive a signal from the get-go with more power and be done with it. Not over driving your current chip, but getting a chip that can be programmed with your ideal frequency that puts out more power by design. Keep in mind it might have a higher drain on battery life, but it'll be unremarkable compared to the motors of the drone running.

What's the likelihood of this included antenna being dogshit?

I mean I have the time and money to replace it but I don't have any meters or anything to test how good or bad it is

>>2604316
It's probably fine if it's just UHF/VHF anyway.

>>2604316
It'll probably be mediocre but it'll get the job done.

>>2604316
I don't know man, better buy a tape measure meme antenna just to be safe. The two that come with it might give you n00b cancer.

Where I work the employees use radios to talk to different departments. They just use the cheapest civilian radios thy can buy, stuff that just has like "channel 1" or whatever.
I have a UV5R can I use it to talk to people with the cheap radios? How do I find out what frequency "channel 1" is?

>>2605066
If you use the FCC advanced license search tool you should be able to pull up the Business class license allocation that your workplace obtained to use radios commercially. From there you can see what's allocated, and use your Baofeng to scan those frequencies while transmitting on channel 1 to see what frequency it lands on.

>>2605066
Get the brand and model. Look it up via whatever search engine of your choice. As an example, the company I work for uses Motorola CLS 1410 on channel 2. Looking this up, I found channel 2 is 464.5500 on these radios. Some radios have preprogrammed PL tones: make sure to add this in. Chsnnel 2 on the CLS1410 uses a PL of 67Hz

I want to do a project about navigation using cellular towers. As far as I understand the towers constantly shit their credentials in the air. So what I gather them and triangulate? This has to work right? No way nobody tried this before.

>>2605244
I have this new invention. I call it the wheel.

>>2605244
I am almost certain someone already did this at deacon. Just watch all the deacon videos on cellular

>>2605244
Sounds similar to the old radio navigation systems for airplanes during the mid 20th century.

>>2605126
>>2605104
Are there risks of using the UV5R if I only broadcast on those bands while being unlicensed? I mean obviously I guess you're not supposed to, but if you're only talking on those frequencies what would the chances be of getting caught? Surely on low TX power it's not going to shoot the signal halfway across the state.

>>2605340
The frequencies that the UV-5R operates on don't propagate beyond line of sight generally. No one can tell you're using a Baofeng to transmit, and if you're not stomping on the the transmissions of others who's going to care? People use these radios to talk on public radio services they're not type accepted for like FRS, MURS, and GMRS all the time, no one except ancient stick-up-the-ass hams gives a fuck especially the FCC. You've gotta really fuck up to get the FCC's attention, and even then they'll just tell you to fuck off.

How feasible is it to create a diy sdr completely from scratch? I have some experience making pcbs and doing digital things, but I haven’t really touched rf before. I figure the hardest part would be learning rf.

>>2605379
forgot to mention my ultimate goal is to receive data from satellites. I plan on starting slow by making basic radio stuff like am/fm receivers, filters, etc. I’m expecting this to be a very long project.

>>2605379
>>2605388
Start by searching for a receiver chip that is capable of what you want. And show it to me.

>>2605322
*defcon

>>2605392
Well I’m trying to figure out if it would be possible to diy the entire rf front end including the receiver. I know I could just buy some ic and be done with it but I want to learn and implement it myself just to see if I can. I did some light searching and it seems like it should be possible using discrete components.

>>2605244
>cellular towers
If you can extract the precice timing signal, you can use multilateration rather than AOA. That simplifies problems from (multiple) reflections.

>>2605379
You're going to need something to interface with your computer if it's actually going to be an SDR, unless you plan on rigging it to be a computer itself. I mean, the S does stand for software. Honestly, you'd probably be better off going more old fashioned if you want to get as close to 100% DIY as possible.

>>2605593
Yea that’s the plan. I’m thinking of using a microcontroller to talk over usb. I think doing processing onboard would be too slow and limited unless I used expensive fpgas. What do you mean by more old fashioned?

>>2605379
The modular method is as follows:
>USB interface: e.g. FT232, FX2, FX3
>DDS Oscillator capable of quadrature outputs: e.g. Si5351
>Mixers: e.g. NE612 (this one is ass don't use it)
>High-speed 2-channel or 2x1chan ADC(s) capable of interfacing directly with your USB interface
>a bunch of analogue filtration, be it discrete or monolithic, for antialiasing and also for removing any square harmonics from your DDS

>>2605640
Well I mean you probably won't be building a processor fast enough to serve the purpose. Not saying you're inept, rather you'd probably need a fab, and most of us aren't loaded enough to have that at our hobby's disposal. So by old fashioned, I mean just dumb circuits that do it all without any real logic.

>>2605379
You can use a 1 bit ADC like in this GPS receiver:
http://www.aholme.co.uk/GPS/Main.htm

So I'm ignorant when it comes to most of Ham radio, but something I really don't understand is the how you would get caught for not having the license? It seems like its mostly an honor system thing/tax on users that can't be enforced unless there's something I'm missing.
Obviously if you just gave out your information and that you didn't have a license freely, you'd get caught. But is there any way to actually track a signal back to its source? Can't imagine it's something as easy as tracking an IP address.

>>2605793
A bunch of boomer old fucks will track you down and report you to the fcc. I'm not joking either. Someone I know has done this, and he'll find you in 20 minutes with no help down to house.

>>2605793
Triangulating signals is trivial for an organisation that has antennae all over the country. The FCC is one such organisation, but not the only one.

That said, if you stick away from commonly monitored or important bands you can probably get away with sporadic transmissions. Transmitting between broadcast radio stations with very narrow-band digital comms is probably quite doable, same for transmitting near powerful foreign stations.

In addition, some bands have no rules. Citizen bands are free for limited power output for voice transmissions, doubt anyone would notice if you mixed some digital data into seemingly innocuous voice transmissions, especially if you keep the data bandwidth below 20Hz. LoRa bands are also free for use, though they're already pushing their SNR capabilities to the extreme, so to abuse them you'd just be increasing the transmit duty cycle or transmit power, both of which would be noticed. And anything below 9kHz needs no license, if you can make use of it. Receiving signals at those frequencies is doable. Transmitting is probably a lot more difficult, and naturally your bit-rate is going to be pretty low. But if you want to just shout a music broadcast (clipped to 9kHz) with a few hundred watts behind it, you'll probably get it shining through on a few peoples' stereos and it might actually be legal.

Hi /HAM/
Im looking for the most simple 27mhz CIBI schematic for a voice transmiter OR receiver
after some research i found this one which is quite nice because the emmiter/receiver parts are well separated but i not sure how hard it is to build something like that ?
There is no documentation on this circuit and i assume you have to tune the coil or something
Im ok with DIY electronic just total noob in radio circuits

>>2605819
heres the source of this schematics :

https://yc3lsb.wordpress.com/2014/07/17/homebrew-cb-am-ch-14-27-125-mhz/

https://yc3lsb.wordpress.com/2013/12/09/homebrew-cb-am-ch-14/


I like this one because it was actually build and shown working and also i don't want IC only discrete components

>>2605793
Radio direction finding of signals is a skill that's as old as radio, and there's systems out there that use arrays of antennas to locate your signal location in a few seconds: https://youtu.be/OY16y1Rl86g

That being said, someone has to get pissed at you and give a shit, and then you have to stand still and keep transmitting while they drive over to find you. Then when they get out of their car to tell you off you shoot them. Ez pz.

An interest in amateur radio years ago taught me about electronics basics, which got me a job for an electronics company, which got me a job for a better one and I started doing an electronics qualification, and that got me into uni and I'm due to graduate soon as an old bastard.

How much effect does the type of wire have on a long wire antenna? What types of wire are people using?

>>2605904
Not much really. Use stranded wire.

>>2605904
I've not made one of those antennas, but ones I've seen online use 18 AWG UL 1007 Wire which is stranded tinned copper wire. Thicker wire usually results in lower SWR across a wider segment of a band than thinner wire, but it's up to you what your needs are. If you're doing something field expedient then any aluminium or steel wire will do just fine, it just won't be as good as the copper wire.

>>2605919
>Thicker wire usually results in lower SWR across a wider segment of a band than thinner wire
This is negligible on HF, with the exception of elements on a beam/yagi. The wire type doesn't matter either. The only concerns should be the power handling if Tx will be done. You won't get a better signal by using Al or Cu. Stranded wire will also be more robust to fatigue/breakage than solid wire.

Is CO0RRC (Cayo Coco off the coast of Cuba) worth working?
Doesn't seem to be its own entity.

>https://www.arrl.org/dues-survey
>No organization likes raising dues, but just like our personal expenses have gone up over the last few years, so to has the cost of operating ARRL.
>We want your input on how ARRL will handle an increase in dues.

>>2606039
I'm a ham, general license, dxer, use lotw, never gave them a dime.

>>2605904
>How much effect does the type of wire have on a long wire antenna?
Very negligable between aluminum and copper. I've used both stranded copper made from a bunch of wires thrown in the garbage spliced together, and speaker wire made of aluminum. No noticable difference. You probably could see it if you had a bunch of devices to measure everything.

>What types of wire are people using?
I'm using speaker wire now simply because I don't want to fix splices or solder points at least once a month.

>>2606039
>pls give us more money to do nothing of worth like every other time we begged for money!

>>2604181
And it is today! Go forth and morse some.

>>2604197
It is decades since I learned Morse code.

>>2604181
That was Thursday.

Just got an HD1 and trying to program it- is the "Enc QT/DQT" column the same as the transmit tone? and the "Dec QT/DQT" column the same as receive tone?

So if a repeater had a 88.5 up/123.0 down tone according to repeaterbook it would be
>Enc QT/DQT: 88.5
>Dec QT/DQT: 123.0
?

>>2606039
Maybe they should have made better use of the $80 they got from selling a brick.

SWITCH FREQUENCIES >>2607354
QSY THE CHANNEL GOING QRT >>2607354
QRZ CONTEST >>2607354
NEW SUBREDDIT >>2607354