/diy/ - Do It Yourself

>>2453247
Does anyone operate an open Wi-Fi access point these days? I used to run one in an urban area that saw some usage but it's been quite a few years. Will I be v& and b&? Any tips?

>>2453253
Sounds like a great way of getting v&.
Pro tip, don't do it.
Also what the fuck does this have to do with ham radio? Go ask /g/ why you're retarded and they'll tell you

>>2453263
>what the fuck does this have to do with ham radio?
I'm into Part 15 operation in addition to Part 97 and Part 95. Last year I got a lot of help here last year with my legal low power non-licensed AM broadcast station. This project is along the same lines.

>>2453263
>what the fuck does this have to do with ham radio?
I'm into Part 15 operation in addition to Part 97 and Part 95. Last year I got a lot of help here with my legal low power non-licensed AM broadcast station. This project is along the same lines.

>>2453280
But why?
You're legally allowed to set up a wifi access point anywhere on your property, but you are also held responsible for any shenanigans that occurs.
What do you think you'll gain from this?

>>2453305
>But why?
Mostly just autism. Although it's also a useful service for some people and I like doing something different. We live in a world where everyone is openly hostile to doing anything whatsoever that doesn't involve paying a subscription fee to some (((company))) or using an (((app))). It's nice to feel as if I am part of something that is independent from all that.

>>2453311
Neat, good luck with your project.
Have a lawyer on speed dial when the glowies come a-knocking

>>2453311
wishful thinking
you need to read the art of war
as it stands you're ngmi.

>tfw my Baofeng and I will never be this based

>Seventy-threes

>>2453336
Is N9RSY on your radar?
Haven't heard him lately on 7.20.

>>2453336
>all that bullshit for only 7 years and $42K in fines
>meanwhile ham niggas think SWAT will come into your house and disrespect your whole family because you used a chink radio without a license

>>2453348
Did you miss the jail and federal prison parts?

>>2453356
Yes, 7 years federal and some jail isn't shit for all the interference is doing, and people act like you're the devil for doing simplex on a cheap ass radio without a license.

>>2453336
>march 2012 released from prison
>april 2012 incessant jamming
Dangerously based

>>2453336
What a living god

>>2453311
1. you set up a hotspot
2. somebody comes there and torrents pizza
3. judge says it's on you because you didn't secure your access point
4. system fucks you with a rusty steel pipe
As an added bonus, legally you'll be a sex offender in prison.
Word gets around and the other guys there won't care much about the details.

>>2453535
>Commiting crimes makes you a god
>Being a retarded man child makes you a god
Which is it?

>>2453635

Anons It's taken like 2 weeks to get all the parts but I finally got my first CB and power supply. It all turns on, success!!

>>2453247
YOU'LL NEVER FIND MY LINEAR FCC!

>>2453253
no, an open wifi is dumb, but not illegal.

>>2453775
oh my sweet summer child...
>good luck getting your antenna tuned
>good luck getting contacts.
>good luck having a conversation that makes any sense.

>>2453558
>somebody comes there and torrents pizza
Why would the FBI be torrenting on my Wi-Fi? They have a comfy office with fast internet just a few minutes away.

>>2453775
>>2453791
You'll get contacts easy but I do have to wonder why you didn't just put it in your car

>>2453775
Why didn't you just hook it up to a battery like a few others told you to?

>>2453808
Too much effort, and I wanted to use it at home anyway

>>2454832
Ah, you installed the chirp unit?

>>2454877
hi fuckin' hi

I'm eyeing lithium batteries for POTA, but this price makes my no-no parts tingle like when Uncle Ronny stays over.
Is there a better option?

>>2455002
How many Watts are you doing? 40 Ah is an awful lot of jonnies, I never emptied 6 Ah with 5W on a SOTA trip.

>>2455005
I have a 12A that couldn't handle the draw of my ic-7300 and big at-1000pro tuner during Field Day.
I upgraded to a 20A which is a nice compromise, but I've made some battery boxes for ham / POTA / Field Day / when our house loses electricity.
The 40Ah fits in those boxes.

>>2455005
>>2455007
You get the idea, night light, flood, electrical output.
That's the 20Ah for scale.

>>2455007
>ic-7300
>auto tuner
>12 Ah
Bring a resonant antenna and use less power next time.

>>2455012
And an inverter of course

>>2455013
It's not just ham. For example, with pic related here >>2455012, when we lost power this summer I ran our router through the inverter for half a day so I could still work from home and be entertained throughout the night while also running a few small fans.

>>2455027
I read your other posts later, makes sense.
Look into Eremit LiFePO4 batteries, they're great and offer a 12V 50Ah option.

There's an FM station I want to listen to from ~50mi away. Using a random speaker wire dipole I can hear it under a whole pile of static.

If I want to make a project out of it, what kind of antenna (or other gadget) can I DIY on the cheap that will make an appreciable difference in the reception

>>2455125
A dipole is easy, a Yagi is a lot better. Both are cheap.

>the Chad repeater

>>2455158
>the Chink repeater
Not that I disapprove of BTECH stuff. a tricked out Baofeng with the more expensive BTECH speaker mic and a Nigoya Antenna is cheaper than a fucking Yaesu and doesn't sound much worse.

>>2455148
This, though a yagi is equally cheap.
Search for tape measure yagi.

How long can I stream music over ham for without a loicense

>>2455425
You can do that anytime for as long as you want. Just beware that it's illegal to do so even if you did have a license. There's only one exception and it is covered in the tech license exam. Read up and learn. It's a fun hobby.

>>2456009
Don't feed the trolls.

>>2455425
>Buy Baofeng
>Buy AUX Cable
>connect old MP3 player or phone to it
>Turn on VOX on the Baofeng to like 10
>Baofeng will transmit when it hears audio in which is your music
Happy jamming

>>2456209
I am troll too, we must feed each other.

>>2453803
They will do it just to fuck with (you).

>Communications agencies hate him!

>>2453336
>no one owns the air, or the frequencies that are transmitted over the air
>tfw a fucking schizo has a better take than ham radio nerds who claim to be so based and care about freedom and preparing for shit that never seems to hit the fan.
https://youtu.be/fpllpB3aqMs?t=93

>>2456368
they really do thougheverless
http://www.burnhambeechesradioclub.org.uk/archives/baofeng-uv-5r-reportedly-banned-in-germany-poland-bigger-problems-may-loom/#:~:text=Bigger%20problems%20may%20loom..,-by%20Admin%20%C2%B7%2007&text=The%20German%20regulator%20Bundesnetzagentur%20(the,the%20Baofeng%20UV%2D5R%20handheld.

>>2456585
wtf, time to buy some handled before they are banned. Fucking EU killing everything fun

>>2456585
>Burnham Beeches
YL only radio club ?

>>2456586
I'm in freedom land (supposedly) and even I bought 4x extra BF-F8HP along with accessories just in case we become yurop, such an odd twist of fate that radios made in a communist country are more free to transmitted on a wider range of frequencies than ones approved by zog regimes, like ours and yurop, but we're we're ones acting like we're free and totally able to criticize the govt.

>>2456627
That article is from 2021, I guess (and hope) other countries don't give a shit about HAMs, although I may buy some TYT TH-UV88 for the reasons you mentioned and because they are cheap and a little bit tougher than the UV-5R

>>2456222
Won't work unless you use a ground loop noise isolator.

woah

>>2456627
>I can't comprehend how my actions might affect things around me
>It must be those freedums grabbin' pinkos tryin' to ruin my fun
>I'll own the dems by pounding a 36 pack of natty ice and screaming slurs into the mic

>>2456712

>>2456627
>>2456630
A real ham would build his own rigs, and not be limited to Chinese suppliers of questionable repute.

>>2456731
But the BF-F8HP is so fuckin based when it's decked out, the radio itself, NA-771 whip antenna, QHM22 mic which is clear as crystal for how chinky this radio is, and even the genuine programming cable to program in those illegal 462MHz freqs, will cost you $138 with free shipping, that's almost impossible to beat when it comes to straight analog radios that happen to be based enough to do GMRS

>>2456729

>>2456737
>so fuckin based when it's decked out
Yeah, It's as cool and functional as pic related

>>2456739
You should get one Anon, I'm not saying it's gonna crap on a Yaesu, but it's really good for what you pay, even when the radio is naked with the stock high gain Antenna, the thing is really good.

>>2455012
I spent all weekend again watching LifePo4 breakdown videos.
I was about to order RoyPow batteries to fill them all, but got cold feet again.
There aren't any quality, budget 30Ah batteries, are there? It's all the same chink shit.

>>2456739
>tfw pic rel would still get the job done
Baofengs are still the most based thing ever for transmitting more wattage than you're supposed to on FRS channels, and a lot of guys want a radio that goes up to 520MHz without modification, while still being able to hit that simplex whenever you want.

>>2456627
>buying a baofeng to use as a radio
>buying four more fucking baofengs

How do I get on GMRS repeaters? Is it just 462MHz frequency + 5MHz for the transmit?

>>2457125
Basically, yeah. And occasionally some of them require the use of narrow FM.

>>2457327
Thanks Anon, I might take a drive closer to the repeater to see if my Baofeng can hit it, says it's an open system.

>>2457327
maybe they use CTCSS or DCS ?

>>2457428
Oh yes they always use coded squelch. I should have mentioned that. For public repeaters these are generally published online somewhere.

Retard here, what kind of connection is this and how do I attach to a standard coax?

>>2457511
pl-259
there is no standard coax.

Why doesn't the zener explode? What am I not understanding? With a 9v battery, shouldn't it over current and blow up?

>>2457523
+Vz is not connected directly to the positive terminal of the battery.

>>2457533
Oh. Lol. Lmao even.

>>2453253
Yeah. But run traffic through VPN.

>Baofeng BF-F8HP is gone from Amazon
Is this the end, bros?

>>2457511
Pl259, 50ohm coax of your choosing (though rg58 is usually shit) go for mini8 (rg8x) if costs are a problem. Better than rg58 by a country mile, and cheaper and more easily manageable than rg213.

>Two hunters are out in the woods when one of them collapses

>He’s not breathing and his eyes are glazed. The other guy whips out his cell phone and calls 911.

>“I think my friend is dead!” he yells. “What can I do?”

>The operator says, “Calm down. First, let’s make sure he’s dead.”

>There’s a silence, then a shot. Back on the phone, the guy says, “OK, now what?”

>>2457831
This is the time for /ham/ to design the next generation digital all band hand held HF transceiver.

Let us call it Bro Fren.

>>2458165
Rx : 0Hz - 100 MHz all modes
Tx : All HAM bands (US only) or 50-50.100 MHz (European version) AM
Power : low 0.02W high 150W
Antenna socket : Mini UHF
Battery : 8x AA
Weight : 10 grams

Anyone know if there is a way to extend the time the baofengs display the welcoming message?
It by default is much too short
Pic slightly related

>>2458180
Normally, having one LPF for each ham band is what drives up the size adn weight of a transceiver. Is there a way to avoid that without too much loss in output power and power efficiency?

>>2458240
>Is there a way to avoid that
No LPF. Like on cheap HF amplifiers. LPF after the final doesn't save power or anything it's just illegal to splatter the whole spectrum with harmonics, but who cares.

>>2458208
No idea, seems unlikely, I put the ID of the radio there, what do you want to do ? Make people think there's a pincode to access the radio ?

>>2458243
Baofeng probably won't let you extend the time it takes to turn this device on because of emergencies, they put a flashy beacon light on there, the baofeng is made for emergency, I just use it to illegally talk my shit.

>>2458243
>Make people think there's a pincode to access the radio ?
Yes

>>2457831
>Purchased 3 times

>>2458275
More like 4 times if you include the one I use I then purchased two more, and then two more during prime day.

I'm feng gang for life.

>>2458165
Kek imagine an air band receive, HF/VHF 136-225MHz/UHF 400-520MHz rig designed by /ham/, the shit wouldn't even be portable but we can dream.

Are the brackets on a call a red flag that Fox/Hound is being used or something else?
I'm always going back and forth trying to decide which mode they're using

>>2458580
The Fox and the Hound is by far the most slept on Disney movie ever.
Its just as gutwrenching to watch as an adult as it was as a kid.

>>2458601
They were all fucked. Bambi, Lion King, etc.
It's all about destroying the family and finding a (((collective))) group to be reigned over.

>>2458242
>LPF after the final doesn't save power or anything it's just illegal to splatter the whole spectrum with harmonics, but who cares.
Perhaps I am old fashioned, but I do care. Splatter makes the band useless, and the idea is rather to make the bands available to more people.
As for power, the high efficiency of truSDX is due to the class E stage and series resonator, from what I hear. At least in this case, the filter relates to power. A DDS can output a waveform on a constant 120 MHz, which than needs only a 60 MHz LPF, and it should be clean. Power is, unfortunately, rather low. A PS stage will be non-linear, and again we are back to the need for LPF, or is there a way around?

>>2458406
>but we can dream.
And that we must.

>>2458275
You don't leave them out in a bowl at Halloween?

>>2458758
That'd be kinda based, instead of being the house that gives full size bars, you're the house that gives out sicc walkie talkies, and the UV-5R is cheap enough to give away, maybe with the AA battery pack on it so that it shits on all other bubble packs.

>>2453253
>>> /g/

>>2453348
Grow up faggot.
Ohh wait, you're hardly old enough to post here.

>>2455125
Build a 3 or 4 element Yagi antenna, don't use a TV antenna,

>>2455427
>The Zoomer Transmitter.
> FCC target as they should be.

>>2456630
>I guess (and hope) other countries don't give a shit about HAMs,

<Heard of the ITU, you idiot?
All countries in the world are tied to it.
So, if you piss off the FCC, you won't be allowed a licence anywhere.
Fucking zoomers need to get with the plan.

>>2459190
Kek, there's absolutely no control on what you can buy here, enjoy your "freedom"

>>2457523
Learn Ohms Law, idiot.

>>2459182
Still not giving you my callsign faget

>>2456627
>such an odd twist of fate that radios made in a communist country are more free
Sure, food for thought, isn't it? And have you considered why they export this when such behaviour inside CN would lead to invioluntary organ donation?
Add to this that cheap LED lighting, nmearly all from CN, causes wideband noise, making the noise floor rise every year? Modern LED lighting lasts decades, so cleaning up this problem will probably take 30+ years, as the governments in the West are asleep at the wheel.

>>2459465
>making the noise floor rise every year
Whoa, is that why the front end of my baofeng dies near my led floor lamp?The thing can't Rx for shit near the lamp, but when I walk away it's clear as fuck.

CQ DE AR. I'm dipping my toes into this after lurking some, and I'm taking a course. I've also looked into getting a starter radio that can do 300km in a reasonable day. I fear my few options here are Baofeng, given local import restrictions. I have enough for a Uv9r. Is that okay or does it happen to miss stuff that the Uv5r has?

>>2459526
>300km
That is a lot to ask of a basedfeng, but should these two stations be within line of sight, and have Nagoya 15.6 inch antennas, or maybe even a yagi pointed directly at each other, I don't see why, I've seen a UV-5R with a Yagi talk line of sight pointed towards another HT with a yagi over 130 miles away and it was full signal.

>>2459534
That's encouraging to hear anon, thanks. Any tips regarding the firmware, modulation, etc? Does the 9r have strictly more stuff than the 5r?

>>2459544
I only have experience with the Baofeng BF-F8HP, but that and the UV-9R are 8 watt radios with not many more features than a UV-5R other than the extra power, and I have hit a 50+ mile simplex call from the top of a big canyon with no issue and only an 18.9 inch ABBREE measuring tape antenna, and I've recently upgraded to the Nagoya NA-771, which is more sensitive on the receive, and transmits better.

I see no problem with two baofengs talking over 100 miles apart if it is line of sight communication

>>2453247
birdy must love that.

>>2453253
i am more interested in what are some common household 'things'

>>2453253
you could use a dns server of your own that redirects all connections to your search engine.

set up a vertical dipole say 25 feet high outdoors, with the whole 50 ohm coax, balun, tuner, ground. get a linear amplifier to increase signal. use tuner to set the antenna to that.

>>2457744
i disagree.

>>2459480
>Whoa
A well known problem. It was mentioned here a few year sago that one airport lost all communications on the air bands, and the G men had to search for the source. They normally don't care much, which is why the problem is allowed to grow and keep growing. In this acse it was way too far, and in the end they located the source to a loght installation with tens of thousands of LEDs and controllers that emitted simply enormous amounts of noise. The installation had to be taken down, and the tower was once more able to communicate.

In reality the problem is rather insidious since old light sources (incadescent, fluorescent etc.) are slowly replaced by noisy LED. Invertsers for solar panels, also from CN, is yet another source of noise.

Why are all of you so fucking obese?

>>2460321
it's a hobby where one just sits down near some electronics

>>2460321
There is a worls outside the burger zone: https://www.youtube.com/watch?v=ydS2yyr1nb8

9490.00 come vibe

>>2460485
Privitannye OM!

>>2460485
>worls
Eat less fatty so your finger doesn't accidentally hit the letter beside it.

>>2456666
I love you daddy

>>2460838
Projecting? I am fit enought, been since I learned MOrse code in .mil a while ago.

What do I need to listen to 118mhz to 136mhz?
I'd like to pick up traffic from my local airport

>>2460909
Any airband-capable receiver, many ham radios can receive it, some SDR dongle capable of VHF will do.
Not sure if the 'fengs can do it, never had one.

>>2460917
I wish Basedfengs could do it, but they can't, they just make up for it by transmitting hella out of band without a cap mod like the Yaesu HTs need, but those are air band receive.

luv me little tecsun pl 330

>>2461071
>tecsun pl 330
Based. What antenna do you use?

>>2461081
I don't yet, I walk around with it until I hear something I like

I passed my extra bros!

>>2461589
Based Amateur extra, I'm still an illegal simplex operator myself, but I wanna get my technician to talk on repeaters.

>>2461589
Congrats, bro! I'll be watching the waterfall for some activity from you.

>>2461590
No better time than now man. Hamstudy.org makes it super easy too.
>>2461591
Sounds good man! Not gonna dox myself here but my qrz has a couple drone shots and a few fish pics. Western NY btw

>>2461589
congrats anon !

>>2461589
Congrats, anon!
>>2461593
>a few fish pics. Western NY btw
You can SSTV them over to Yurop in the evening.

>>2461630
I'll be on 14.230 SSTV periodically for the next few hours sending over to you mr. Yurop.

>>2461731
I am listening now.

>>2461731
That you?

Has anyone had any experience with a vertical dipole on 20 m or any hf band for that matter?
I have a 40 ft spiderbeam mast and an inverted vee is too much. It bends over like it's hooked a great white no matter how much i guy it.

>>2461875
>It bends over
Most people with telescopic lightweight masts use them in a bent fashion, just guying the lower half.
Some would just collapse down from the top load's weight anyway if straight.

>>2461803
Nope. I only use white letters with black boarders. The band was mostly closed earlier but I transmitted a dozen times with no reply.

Gonna send a picture of 4 chicks in bikinis in the back of a truck a few times here b4 I hit the hay though.

>>2460485
Moshi Moshi, Lukas-kun desu~

>>2461902
I got the clamp kit. I'm gonna try a vertical dipole see what happens. Also saw an idea where the lower leg is lengthend and the leg pulled out 75 degrees from the mast.

>>2453263
>he doesn't know HAMs have access to 2.4GHz

>>2457831
I wonder if they removed the 400-520 MHz illegal Baofengs because they're not supposed to be selling stuff that transmitted out of band since 2018 or so. When I bought my feng, I was surprised that amazon was blatantly selling something that transmitted out of band when it was illegal as fuck to do so, I noticed you can't even find the UV-82HP anymore, because it does the same illegal stuff the BF-F8HP does, all they have now are the regular ham band locked UV-5R and UV-82, but you can unlock them by fucking around with the buttons and twisting the volume knob to unlock it, but it's a shame you can't get the 8 watt bois anymore.

>>2462683
Probably because nobody uses ham radio except rescue ops and truckers

>>2462698
True, but the Basedfengs were being purchased as very high power GMRS walkie talkies that you can put big ass Nagoya Antennas on and get stupid range even when it's not direct line of sight, I've got a 2.8w Midland walkie, but the antenna is so stubby and small, it doesn't get range for shit if you're talking car to car and it gets out of sight, and it can only fit 3 AA batteries, while my Baofeng has the adapter pack for 5x AA batteries, which lasts quite decently on 8 watts, lasts a dumb amount of time if you set the Tx power to 1w.


Thing was too based for its own good, that's why the alphabet bois have a problem with it.

>>2462683
If you are lucky to get one that can transmit out of band right out of the box, it's because it's old stock.

>>2462706
That's where the BF-F8HP and UV-82HP come into play, those were the newest 8 watt Baofengs that were illegally transmitting out of the box, I got mine on July 6 of this year shipped from Amazon, and they were selling those two just until a week or so ago, luckily the UV-5R is still cheaper than a motherfucker and can be unlocked, but they're not 8 watts, and I know 8 watts isn't the end all be all, but it helped get a little bit more transmit range at the expense of battery life, I normally run my BF-F8HP on medium power, still gets mad range and the battery life damn near doubles.

She will be missed.

>>2462710
And so it begins... and here I was thinking I was dumb for stockpiling 4 of them and regretting doing if they might be available forever.

>>2462003
Conditions have gone to the dogs in the last days, I spent a while listening but only received Yuro hams.

Hi
The time has come to buy my first shortwave TRX. I got to chatting with one of the local hams who has a few Yaesu ones and I was thinking about taking him up on the offer - I'd like something that is fixable if (when) it breaks, something that's not full of microcontrollers.
Is getting one of those a good idea, or should I stay away and just get something more modern from someone I don't know?
I'm also a bit lost regarding other hardware I'll need -- how much should I expect to spend on a power supply and tuner?
And finally: I want to get into CW as soon as possible. I still haven't wrapped my head around how much of the work of generating the baseband signal is done by the paddle vs the keyer.
Sorry if these are stupid questions, I'm obviously a noob.

>>2462931
>I'd like something that is fixable if (when) it breaks, something that's not full of microcontrollers
You have to get something pre-frequency displays then or at least pre-menu. Something from the 80s to 90s would suit well, but you can have fun with a hybrid transistor/tube model like pic related too. They come with full service manuals.
Or do homebrew.


>I want to get into CW as soon as possible
>>how do I into Morse code in a good way?
>https://pastebin.com/XwATbRrH
It's in the OP >>2453247

>>2462942
Thanks for the answer!
The ham nearby has FT-7s, FT-747s and an FT-767 which he claims all fit into that category. Am I right in assuming that I need a separate CW keyer for all of those (and the FT-101 too)?
>>>how do I into Morse code in a good way?
Learning morse isn't what baffles me -- that's no different from learning another language which I have done and am doing as well. I'm interested in the technology behind the devices that are typically used for producing morse.

>>2462950
>a separate CW keyer
If you want to use a paddle, yes.
If you want to use a straight key, bug or cootie, no, because you just produce keying/unkeying yourself.
>I'm interested in the technology behind the devices that are typically used for producing morse.
It's just a signal on a specific frequency that's turned on and off.
On the receiving side you just need a beat oscillator, like for SSB. The frequency you see on modern rigs is basically offset by the beat frequency without it showing to you.

>>2462958
>If you want to use a paddle, yes.
Thanks, that's what I was wondering about.
Am I right in assuming that the paddle itself only shorts one of two contacts (one for dits, one for dahs) to ground, which the keyer then interprets? While 30€ aren't much, I still feel like that's quite expensive for what are essentially two SPST buttons made of Chinesium, so building a nice one for the same amount of money seems like a decent idea to me.

>>2462960
>only shorts one of two contacts (one for dits, one for dahs) to ground, which the keyer then interprets?
Yes. Modern rigs often have a separate jack for paddles and the keyers built in.

Waiting for the special callsigns

Is NI6GER a valid US callsign?

>>2463085
It's not on qrz at least

>>2463085
There’s no specific rule against it that is publicly specified. It’s not an experimental station call or anything, is what I mean.

>>2458180
>hand held
>150 watts
in front of your face?

>>2463312
Yes, you just key up the radio again to kill your cancer cells.

>>2463312
Yes. Don't worry, you get more RF exposure from other places yet you are fine.

>>2453253
Why?

/ham/ newfag here, I want to have a VHF antenna in my attic, but I also have a lot of my network stuff in there (switches and ethernet cables which run throughout my house). I've got a lot of space in my attic thankfully, so the max distance I can put the antenna from any sort of data equipment is probably a good 10 feet. However, some length of coax will inevitably have to run near or parallel to some ethernet cables/network equipment in order to get down to my room or garage.

This is a terrible idea, right? I can't risk disrupting my network, I have some pretty important servers running that I can't risk disrupting.

>>2463474
You'll likely have problems or be chasing problems.

>>2463466
>>2453311

>>2463474
If your antenna is very, very well matche for the frequency you want to use (144-148 I presume ?) The coax shouldn't be a problem. But the power radiated from the antenna will be. If some of your equipment will be in the radiation pattern (like your antenna is at the same level of the equipment, not above) it's asking for trouble above let's say 5W, I myself wouldn't put anything in proximity of an antenna emitting 10W in VHF and especially not things with cables that are good receiving antennas and can produce high voltages to the equipment it's connected into.
Can you put the VHF antenna somewhere else ? Balcony, at a window, a VHF antenna can be stealthy

>>2463494
>>2463590
Thanks anons, I'll keep that in mind.

Anons, I’ve been studying for about 5 days now and can consistently pass the Technician and General practice exams. I’ve moved on to the Extra and should be done studying that in about 5 days. I’ve learned a lot but now I’m wondering what the point is? Yeah it’s cool to chat with someone far away but to not even be able to use encryption has me wondering what the hell I’m going to actually use this for. AREDN seems cool but with no encryption and low speeds not that cool. I’m just not really sure what I’m gaining when most capabilities have a more capable non HAM counterpart.

>>2463686
I'd just stop and kys now.

>>2463692
If you told me that over any of the ham bands I could have a volunteer boomer showing up at your house.

>>2463686
Then just stop. Why are you tortoring yourself studying when ham isn't going to fit your goals?

>>2453253
>>2453263
/g/ wouldn't tell them anything.

>>2463711
I’m not trying to complain I’m just wondering what makes everyone spend time using their equipment that is worthwhile? I like the ability to communicate without using someone else’s network or infrastructure. I’m just confused on why I have to learn so much when all I need to use much more capable equipment, like Airfiber systems from Ubiquity, is a credit card. I’m not torturing myself I’ve been wanting to learn this for a while and am interested in radios.

>>2453253
i use to provide an open wifi router that transparently proxied everything through tor kind of like this normie project
https://learn.adafruit.com/onion-pi/overview

>>2463749
>transparently proxied everything through tor
Absolutely based. I never thought of that option. Did it work OK?

>>2463474
>slow cooking your network equipment crispy

It's a great idea. Probably the most effective way of running equipment without leaving fingerprints.

Either move your antenna, for invest in some HEAVY shielding.

Coax wont be a problem, with a choke it shouldn't radiate anything noticeable. The antenna however will put out enough to at least reboot all your shit, at worst liberate some blue smoke

>>2463719
>I’m just confused on why I have to learn so much when all I need to use much more capable equipment,
be glad morse isn't required.

it's a combination of legal gatekeeping, and really old rules. designed to keep the riff raff out.

I thought about getting my license but I have no interest in talking to anyone I have ever heard on ham radio. the 80's was the pinnacle of ham radio. there was sstv, hams talking all over the place, the russian woodpecker, numbers stations, teletype, radio fax, and all sorts of stuff, now it's contests and crazy preachers with the occasional radio fax.

there is just nothing there.
even cb is dead.

>>2463686
>Yeah it’s cool to chat with someone far away but to not even be able to use encryption has me wondering what the hell I’m going to actually use this for.
There are plenty of ways to maintain privacy without encryption. "One if by Land, Two if by Sea"
>AREDN seems cool but with no encryption and low speeds not that cool.
Not everything is about being speedy or cool. There is also efficiency.
>I’m just not really sure what I’m gaining when most capabilities have a more capable non HAM counterpart.
With a license you gain the skills and also permission to build and run equipment that involves very high voltages.

>>2463719
>I’m not trying to complain I’m just wondering what makes everyone spend time using their equipment that is worthwhile?
The FAQ goes into details about this.
>I like the ability to communicate without using someone else’s network or infrastructure. I’m just confused on why I have to learn so much when all I need to use much more capable equipment, like Airfiber systems from Ubiquity, is a credit card.
You need to know how not to kill yourself on your home made high voltage gear. I waas once fried using a badly maintained radio and can attest this is important.
>I’m not torturing myself I’ve been wanting to learn this for a while and am interested in radios.
I have never heard of anyone regretting learning new things.

Anyone here used 3-axis stabilised marine VSAT antenna systems before?

I'm unfamiliar with some of the jargon and electronics involved for moving and stabilizing the antenna.

For example, what is cross-level in relation to Azimuth and Elevation? I assume it's like rolling the antenna side to side if it's installed on a boat.

But then there's terms like 'skew' and 'tilt' which I thought meant the same thing. Though I think skew is a fixed value based on where the satellite is but I'm not sure.

Anyway thought it'd be cool to ask.

>>2464233
Skew as in fixed offset value

>>2464233
>cross-level
it's another axis, no idea what it does

>>2464233
I see, the ship can move on 3 axis so you need 3 axis on the antenna too.
It is to maintain elevation axis horizontal. You put a gyroscope or some gravity sensor in control of that and you are good.

>>2453247
Has anyone built a coiled vertical?
I'm looking to build one for 160m and 80m.
Have a pully about 40 feet up in a tree and wanted to have sloping radials down to the ground.
Figured I'd try and make a coiled vertical 1/4 wave much like the basic homebrew VHF/UHF instructions

>>2462710
ARRL here, just want to remind you it's illegal to do illegal stuff, and if you have a radio on you we're not responsible.
Remember, having a radio is not a license to kill!

Does anyone have their GROL? If so, how was is to get it?

>>2464599
Haha pirate baofeng go beep boop

German hams, how did you prepare for the exam and how much time did you need? It would be nice if you could include your could shortly describe your knowledge prior to the ham radio exam for reference. Are there any good books in addition to an app with the question catalogue?

Seems people use KiwiSDR with the new Beaglebone AI-64 (though there is one hazard).
First off, when will we see an updated KiwiSDR? Some Chinese dudes have already made a clone with an ADC with more bits. 50 MHz support would be nice. There is also room for improvement for the GPS sub system, with L2 and L5.
Secondly, anyone got the user's guide to the C7 DSP on that board? I already searched, just found also others have searched with no success. Yet it would be pretty useless to include a DSP you couldn't program.

>my baby is back on sale again
Thought we'd lost her.

Hi frens, me and my hunting mates got some uv5rs to communicate while in the woods and be a little safer when taking our shots. one simple question:
the radio can operate in both UHF and VHF frequencies, assuming we only care about the best signal clarity and range and that we are in a plains environment with long sightlines, which one of those is better? also, assuming we pick either of those spaces, are there any frequencies which are better to transmit to? Don't worry about interference with other users because we are in a pretty remote place in the middle of Argentina

Shortwave radios…is there a good one that I can get for under $100 that is actually reliable?

>>2466140
vhf will go a bit further in theory. just try some different frequencies when you get out there to find the best one

>>2466149
Receiver or transceiver?

>>2466340
Receiver is fine.

>>2466365
Probably the most authoritative list, continuously updated:
https://swling.com/db/

>>2453790
Of course it's not illegal, but you, as the contract signee, will be held liable if someone downloads pizza through it.
Why would someone go through that hassle?

>>2453336
>April 2012
>playing of rap music
I hope he dies in prison

>>2453789
Based cancermaxxer

>>2456585
>banned in germany
As if I'd ever follow a single fucking law

>>2466400
How do you search by price?

>>2453247
I really hate how expensive HF stuff is guys. It just doesn't make sense. And the worst thing is no matter how long you lurk you will never find a deal on any of it.

>>2466564
yep, even used rigs are expensive, because boomers.
I know a lot who have multiple FT-450D, or similar rigs and are just sitting on them, igs who fit a beginner use well

>>2466564
One advantage of living in a small apartment with an insane noise floor.

>pulled old yaesu 2m mobile out of the closet
>display flashing, no tx/rx. people on the internet are saying something about a PLL unlock
Should I even bother trying to ship this out to someone or just accept that this thing is a brick now?

>>2466591
what model, anon ?

>>2466592
FT-1500M. The polite lady at Yaesu told me my serial number dates back to 2001 so they wont touch it but sent me a list of a bunch of 3rd party guys.

>>2466596
too old to be serviced but too recent to go in h=its entrails with a soldering iron, that's unfortunate, sorry anon

>>2466562
I didn't see any way to do that, you will have to look up each entry yourself. That list will help you in avoiding garbage tier stuff.

>>2466568
>boomers not selling their gear is why HF rigs are expensive
>but baomemes are cheap so everything else should be too
You fucking fags are something else.

>>2466568
>>2466630
Just get a truSDX or RadioBerry.

>>2466598
That's what I was fearing. Oh well, this could be a good excuse to finally get a proper base station dual bander.

I did modify the thing for MARS a few years ago but at the time it still ran perfectly fine. It'd probably cost more than what it's worth to diagnose and repair it now I imagine.

>>2466635
Is the radioberry a transceiver or just an SDR?

>>2466635
The truSDX looks interesting. Why would someone go with a Yaesu FT-818 over a truSDX? They're both the same transmit power.

>>2466652
quality of the radio and audio part, robustness, but I want both (I already have a FT-818) they don't have the same usage

>>2466660
Really? What would you consider their two use cases to be? I'm thinking this truSDX is a much easier way into sota than the FT-818

>>2466662
If I go for a walk and might try a bit of radio, I'll bring the truSDX or another thing like that, because radio would be a secondary activity, for SOTA, flora fauna, IOTA, I'll bring the FT-818 cause I'll stay one entire day listening to noise and I want that noise to be comfortable, plus I'll bring a battery and maybe the little amplifier.
The truSDX would go with me when I visit my parents for the weekend too
I have a 20m kit that is really lightweight that has this role but it's only 20m...

>>2466624
Okay so it doesn’t answer my question then, but thanks just the same.

>>2466643
>radioberry
It is a transceiver, but without a PA the output power is weak.

>>2466652
FT-818 also does VHF/UHF. Also most brands are more polished than a 3D printed enclosure and minimalistic user interface. However, it is just a matter of time before someone takes the concept of truSDX and adds more bands and a more polished user interface, possibly a waterfall.

>>2466687
It really feels like these things are only expensive just because they've always been expensive. You can get much more complicated that have much lower tolerances, like wifi routers, for significantly cheaper

>>2466695
Yeah, same thing for houses and cars too. You see my wifi router cost $150 so I should be able to buy a plane for, like, $500 because it's only metal panels with an engine, wires and spinney bits, right? Gee, I had to get a new cell phone and it was like a grand, but I could already buy a cordless phone for $15, you know, so clearly it was so expensive because of the stock traders in the 80s kept the price high. Man, it must have been quite a coke fueled fight to maintain that premium price once the WRT54g came to market.

>>2466695
They charge what the market can accept, that is probably the main reason.
Secondly brands use old tech such as triple conversion, while truSDX et al use modern DSP tech plus a clever Si5153 hack. There is a huge tech distance between mass market mobile phone and ham transceivers that exist only because of tradition, a gap that is bound to be closed soon.

>>2466810
>I had to get a new cell phone and it was like a grand, but I could already buy a cordless phone for $15
So you're saying that HF transceivers are significantly more advanced than a wifi router? Get out of here. Those radios haven't changed in decades (unless you're talking about the new touch screen ones)

I wonder if I've ever heard any of you Euro lads when I'm sniffing around the ham bands late at night all comfy in bed.

>>2467059
I made a few contacts outside Europe but with a end fed, 100W and in the middle of small mountains, it's difficult. The horizon is at least at 15° of elevation
When the propagation was awesome I contacted a US East coast net on 40m once.
Did Asia but it's easy as the path is through the north pole, waves can bounce against auroras and all that ionized shit there.
Where are you, roughly, anon ? 27 here, locator is JN26

>>2467055
NYA but I just had a look at the latest stuff:
https://qrznow.com/q900-version-3-all-band-all-mode-hf-vhf-uhf-transceiver/
>Compared with the first version (HS2) and the second version (qr20), the third generation has optimized all previous problems.
Yeah, right. I think I'll give this advanced problems rig a miss.

Your mention of routers made me think about the user interfaces. Most routers have a web interface and it can be customised at server or client side (greasemonkey etc.). Ham radios have normally really clunky interfaces. Pic. related could have simplified a lot with that big screen, but decided to go for buttonmania plus big screen, plain insanity.
A left plus screen for waterfall and RF data plus a right screen for data and decoding with buttons around the periphery would have been far simpler.

>>2467106
>Knobs are bad
kys

>>2467074
27 (UK). I only listen on my shortwave radio.

>>2467118
I never claims that. I just find it messy when knobs are scattered all over the front. You can only realistically handle 2 knobs at a time. And that beast has 20+ plus about 40 buttons. It is a mess.

>>2467185
>messy knobs
Learn how to operate a HF radio correctly. Using someone else's config for a SDR doesn't count.

>>2467307
>learn to deal with unnecessary clusterfucks instead of applying the KISS principle

>>2466630
>but baomemes are cheap so everything else should be too
Yes.

There is nothing wrong with Baofengs other than the spurious emissions.

>>2467307
>Learn how to operate a HF radio correctly.
I have.

t.Mil spark

>>2467318
700 layers of sub-menus is not KISS

>>2467389
>messy knobs
>mil spark
airsoft doesn't count as service

Bored newfag here. Just bored out of my mind and looking for a hobby.
Is HAM radio basically a chat for old people or some shit? What exactly is the whole idea behind just talking to randos around you or on the other side of the globe with equipment costing several thousand dollars when you can do similar shit online.
Obviously I'm not accounting for some "apocalypse" that would bring down all communication.
What's the "thrill"?

Sorry if I sound condescending but I just don't get it, is there something I'm not seeing?

>>2467483
>What's the "thrill"?
Communicating great distances without infrastructure reliance.
>Just bored out of my mind and looking for a hobby.
For you, I'd recommend gas station glory hole beneficiary.

>For you, I'd recommend gas station glory hole beneficiary.

Yup, seems like it's not something for me. I don't expect some global apocalypse to happen anytime soon that would make infrastructure to current modes of communication inaccessible.

>>2467487
>Communicating great distances without infrastructure reliance.
This, I was parkedon top of a mountain with the boys over looking the city, and I just whip out the Baofeng on 2M 146.520 and tried calling, actually hit somebody over 50 miles away near the ocean who with a 20 watt station, that's how ridiculous this medium of communication can reach.

>>2467477
I was not aware of any airsoft that was a service, did HF radios or even Morse code.

>>2467522
>I was not aware of any airsoft that was a service, did HF radios or even Morse code.

>>2467483
It's an awesome hobby to learn and understand so much about your surroundings from a scientific standpoint, especially with the nonstop proliferation of wireless technology nowadays. signal propagation, wavelengths, antenna and transceiver design, (ab)using the minute differences between certain frequency bands (HF vs UHF), you name it. Before getting into buying all kinds of expensive equipment of having to deal with getting your ham radio license, you could start with a simple RTL-SDR receiver, the genuine one from the RTL-SDR blog should run about 40 bucks and does 24-1700MHz, receive only, so no license needed. You can start exploring the airwaves and play with decoding pager systems, P25/DMR radios, etc.

If you want to get a simple transceiver, look at the different Baofeng or Retevis offerings and experiment on license-free frequencies such as FRS/GMRS/PMR446 depending on where you live

It greatly helps if you know how to solder and basic electronics first. To make your own antenna's and coaxial cable, you'll need an SWR meter or Vector network analyser (nanoVNA) and a coax crimping tool

>>2467487
>>What's the "thrill"?
>Communicating great distances without infrastructure reliance.
this, plus eavesdropping on stuff is pretty cool

>>2467541
>gottem

>>2467541
to add
there is so much stuff to do without a ham license, and even if you do, there is so much more to it than sitting behind your desk and fiddling with knobs. Other license free ideas is setting up a private off-grid lora mesh with friends and have pager service. I haven't played with meshtastic, but it looks interesting and is licensefree as well.

Talking on repeaters('ragdolling') with other hams is usually boring as fuck. If you have a license, you could do POTA/SOTA, hike up a hill and try to hit a repeater from a large distance, getting a quick signal report and not much else. Doesn't work? make your own yagi antenna or try a different frequency band

Unless you have the real estate at home to get a decent dipole or end fed antenna for shortwave transmitting, you'll be stuck to field work with HF radio's like the Xiegu X6100 and such. Digital modes are awesome on HF btw

>>2467548
>('ragdolling')
Thanks wikipedia boy

not realy HAM related question, more on radiofreqs. Asking here since some of you may have great knowledge to share :)

I have interest into learning about potential health effect of Radiofrequency under high voltages. Can someone points me informations on that ?

By instance, could radiofrequencies going in 400V 3phase cables be dangerous for health when you sit all days 8 feet away from them ?

Last question, I'm setting up a FM/AM radio tuner and the reception is bad. I'm behind a big middle age castle and the area Antenna is on the other side.
I'd like to put an antenna on my rooftop to have good AM listening, FM is a second zone interest. Which Antenna/solution would you recommend ?

my tuners are:
Technics ST-9030, Technics ST-X302L

I'd also like to receive on lower kHz freqs, like 20kHz-250kHz, any tuner with RCA outputs to recommend ?

>>2467602
reddit, go there

>>2467602
Mains operate on 50, 60 or 400 Hz and are hardly radio frequencies by normal understanding of the term. People work with high power systems at swichng stations at thousands of volts, and at power stations, and no health issues have been found.

If you want to listen to low frequencies, the simplest, cheapest and fastest way is to point your web browser to any of the KiwiSDR receives on the net.

>>2467702
I'd like to listen to the buzz coming out from those 400A cables, carrying PLC freqs on and see if it's just phasing with the discrete rythme trouble I feel in the ground of my office, even electricity cut off from the whole room.

>>2467602
to receive AM you can just get a bunch of wire and make your own loop antenna, you can just stick a portable radio inside the loop and it'll wirelessly couple with the radio's built-in antenna

https://swling.com/blog/2018/08/bill-tweaks-his-am-loop-antenna-for-optimal-mediumwave-performance/

>>2467584
Shut the fuck up bitch boy, I don’t see you writing out proper reply to encourage fellow anons to take up an interest in ham radio. Go suckstart a Cummins 4BT.

>>2467734
thank you glad for the tips, I will dig around this.

>>2467903
Stop giving advice about things you don't have a clue about. You obviously know how to suck on large things, maybe stick with that.

>Nagoya 771: $21
>This shit: $8.99 and it's longer
Can someone red pill me on the measuring tape antennas? These things don't look like they can possibly be tuned for anything but they're so cheap and you can get them in retard lengths. If it's like a stock Baofeng antenna that does 136-174/400-520 but huge, that might be ideal for me because I just got a Baofeng and it transmits out of range.

>>2467996
Imagine being this mad because I accidentally called it ragdolling instead of ragchewing. Are you gonna comment on my grammar next, you fuckwad?
My posts are fucking legit and factual, faggot.

You need to stop offering your boy pussy to every geezer on the local repeater. You ain’t shit.

>>2468408
this fag might give you some answers regarding the length that will suits you the best :
https://www.youtube.com/watch?v=KDBC0azUa50
48cm seems to be the best compromise for VHF/UHF
the longer the better for VHF
48 and 88 are the best for UHF
Also don't bother buying Nagoya, you want some cheap antenna, go for the Abbree or another chink stuff, you want quality go for Diamond

>>2468464
Thanks anon, I'm looking at abbree and they have some cheap ass whips that are specifically tuned for I can do GMRS with the boys.

>>2468443
>listen to me 'cause I'm hecking valid

>>2453247
WHY I CANNOT FIND ACTUAL REAL SDR THAT ISN'T JUST FAKE "SDR" WITH HARDWARE FREQUENCY DEMODULATION REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Are there any good products? I just want FUCKING AETHER

>>2468653
>chinkshit cope

>>2468660
huh, that's industry standard for some reason, easier

Rate my poverty HF setup that is in the mail:

102" whip
generic $100 antenna tuner 1-30mhz
Xiegu G90

>>2468408
Just bought 3 and they are great. Much better clarity compared to stock Baofeng antennas. Did require trimming rubber on the base to fully screw in.

>>2468692
>CB antenna
>mystery tuner
>HF radio with built-in tuner
>3 chink tape ruler antennas

>>2453280
>my legal low power non-licensed AM broadcast station
>>2453280
tell me more

>be me
>take the ham radio exam in a class with driver's license exam takers
>finished 50 questions in 5 minutes cuz it's pretty easy in my country
>while leaving
>someonecryingatthedoor.jpg
>I asked the exam supervisors about what's going on
>they explained to me that when I finished it, the system automatically shuts down any new entrants from getting in
>mfw my success is somebody's suffering

>>2468989
Basically Part 15 authorizes license-free transmissions in the MW broadcast band as long as you adhere with certain technical restrictions. There is a power limit and a very restrictive antenna length limit. You DIY if you want or you can purchase a certified transmitter. The range is typically a few city blocks, up to maybe a mile under very ideal circumstances. It's a unique and interesting way to get on the air with no licensing and no content restrictions. And it's a way to provide services to your local community that would not make sense in a commercial broadcast context.

>>2469391
youd still need to license copyrighted content, tho

>>2469210
Congrats on going for your Extra, Patrick! Have you gotten any free pizzas since you were doxxed on here?

>>2469476
Okay? I am not transmitting copyrighted content.

>>2468699
>CB antenna
chad 8.5 foot whip flexing on antennalets

>mystery tuner
something simple enough even the chinese can do it right

>3 chink tape ruler antennas
It's literally a piece of wire with SMA connector on the end

PRC VERU HONORABRU

>>2469520
It's funny how ham guys wanna dis the measuring tape antennas like the ABBREE, but then they go compare it to an expensive as fuck nagoya, and it does just about as good as the nagoya on VHF, but it destroys it on UHF because it's so wide-banded, it's the Baofeng of antennas, I've even returned my NA-771 back to Amazon and switched back to the 18.9 inch ABBREE because the thing is just so goddamn strong on UHF at $8, and it will still hit that simplex really far away on 146.520.

>>2469525
Ham guys aren't flexing with nagoya antennas, literally made by baomeme, dimwit. If you need to flex you should be using something like Vertex, Diamond, or Larsen.

>>2469770
They partnered with Baomeme, but they're their own manufacture of quality stuff, I've seen Nagoyas put on all kinds of quality radios, and I've even seen ABBREE antennas put on Kenwood radios.

I know nothing about antennas but I want to make an AM and FM antenna for a HiFi system I have. For the FM, I was planning on making a Dipole, I have lots of speaker wire.

For the AM, I was hoping I could put a long wire in my attic, I have an infinite supply of 24 gauge cross connect wire from work, I'm assuming I can't zig-zag the wire back and forth across my attic to increase the length because that's not how radio waves work.

When making the dipole for FM, How do I know how long to make each end? I know it should be half wavelength from end to end, but where do I put it on the FM band? Just "in the middle"? The wavelength of FM is anywhere from 3.4 meter to 2.77 meters ish, how do I know my antenna will then match the numbers on my tuner?

Sorry for the noob questions that I'm sure you get spammed with endlessly.

>>2469905
>The wavelength of FM is anywhere from 3.4 meter to 2.77 meters ish
This is not high precision stuff, both a 2 m and a 4 m dipole will work, just not as well. FM is close to line of sight so most likely the stations you want to listen to are fairly close, so switching length as you tune across teh FM band is hardly needed.

>>2469905
seems good, a long wire of random length for HF will be good, you don't want a resonant antenna that will be deaf on some frequencies. you can reasonably zigzag the wire, like just a Z with short ends, or a big U, you don't care about parasitic capacitance here as it is to receive and folded dipoles are a thing in HAM world
a vertical piece of metal from 50cm to 2m will be ok for FM, not sure if a resonant antenna will help but it's easier to go near 1/2 wavelength maybe consider putting up together some kind of proper FM antenna like picrel

>>2469945
>>2469950
Thanks for the info. I appreciate it. For the AM antenna, I should do a Zig zag like a Z, not going back and forth over and over across my attic, right?

>>2469952
>not going back and forth over and over
exact, that doesn't really make your antenna longer if you do that anyway.
The way to make an antenna longer is winding it up in a circle like picrel, it's a coil

most american antenna ever

>>2453247
Any gnu radio chads? Does anyone have any experience in making sweeping spectrum analysis in gnu radio? I can make something that sweeps, but I fail how I can integrate it in the plotting part of gnu radio companion.
>tl;dr how to turn shit usb dongle with 2mhz bw into a poorfag spectrum analyzer

>>2469955
yeah I saw that people made coils, but most of the stuff I found online are for non-direct connections to equipment, like putting a portable radio into the coil. I am going to connect it to a tuner hooked to my HiFi system.

Is there a special way to make the lead wire to the device? It needs to go up about 30-40 feet

>>2469819

>>2469957
>Didn't use an Eagle to lift the cord up the chimney
This is merely Canadian.

>>2453316
>the art of war
more like the art of onions

I have an idea and I need confirmation or denial. Synthetic-aperture radar uses a comparatively short antenna to receive radio waves, but moves it over the landscape to create the "synthetic aperture", essentially a virtual antenna much longer than the actual one. Imagine stitching together several photographs to obtain a high-fidelity image of a larger area.
Could you do the same with other radio transmissions? That is, could you theoretically move a small antenna across the wave length of a larger carrier wave to receive it "piecemeal"? Naturally it would only be good for data tranmission, no real time voice ofc. I'm thinking of people using VLF/ULF to send very long distance text/data with comparatively short antennae.

Buying my first non-HT soon. Opinions on Yaesu FTM-400XDR?

Why can't i get ham radio with my sdr dongle?!

>>2470825
>No activity in area
>Poor antenna
>High noise floor
>Operator ignorance

>>2470303
>Not a naked drunk chasing a scared dog up the tower.
This is clearly british

Anyone having success on 80m yet?
Still shy 41 countries for a 80M DXCC

>>2471318
>Still shy 41 countries for a 80M DXCC
Not bad

>>2470674
Imaging is a bit different but using multiple antennas and keeping the phase information does work. Essentially you have redicovered MIMI and wavefront antennas such as circular arrays like pic. related.
I just hope your back yard is spacious.

I've joined a club at my uni that is designing an RF Ion Thruster. A large part of the design is a helical coil of wire that's going to have a shitload of RF frequency current pumped through it.
It's effectively a high power (~1000W) helical (spiral?) antenna.
I've done low-power ham stuff before, but I never got super far. Even then, I evidently still have the most experience with it on the team. High power RF is an entirely new ball game for me. I'm taking an EMF class this semester but we're still on electrostatics, nothing on electrodynamics (and I doubt we'll touch anything like antenna theory in a class like this).

I know impedance matching is important in antennas to maximize power transfer to the electromagnetic field. What would happen if an RF antenna flowing 25 amps through it wasn't properly impedance matched?
For a helical/spiral antenna, is it safe to say that the majority of the radiation is contained "within" the helix itself?

>>2471983
correction, it's apparently not a helical antenna but an "RF Coil"

>>2471983
>I've done low-power ham stuff before, but I never got super far. Even then, I evidently still have the most experience with it on the team.
Lel. Tons of money is going in to propulsion research right now but the knowledge base isn't really there yet. Seek out a knowledgeable mentor and try not to toast your nuts off or otherwise injure yourself. You are going to be operating without any guard rails until your university learns some safety lessons the hard way.

>>2471993
>but the knowledge base isn't really there yet
A lot of this is classified. I worked at a lab where we had a device vaguely related to this tech and there was a lot of work to get the device exported from the US to another NATO country.

>>2472153
>>2471993
so I'm pretty much going to have to start from basic principles in designing some kind of antenna/coil that can output enough concentrated EMF/ionizing radiation to ionize argon?

tobh I don't think my ARRL antenna book has a section on that

>>2465386
>not saving $5
>supporting amazon
ngmi

>>2472189
I hate Amazon but those motherfuckers give free shipping if it's over $35 and that's very hard to compete with, I also saved $55 when buying a pair of Baofengs for my stash on prime day.

>>2471973
>MIMI and wavefront antennas
Thank you for giving me more interesting words to google anon, i appreciate it

>>2453247
5 to go

>>2472163
I think that's the basic idea. I briefly worked in a lab with one of these however I did not work with that thing at all. All I know is that grad students were constantly at work iterating on the design over many many years. If you can learn some details about how other people have solved the problem, that might be a better place than starting from base principles. There should be some info online but you'll have to dig for it. And don't be afraid to reach out to other universities just in case they have anything to share.
Oh and and I witnessed the questionable/terrible safety practices. And a lab accident that resulted in disability and was covered up. Hence my earlier warning.
>>2472153
There are export regulations. But it's not necessarily all secret. You should be able to find a bit of info online and in research papers.

>>2472189
Bought that very radio from Amazon two days ago for $45.

>>2472191
>I hate amazon, but
>but
really nigga?
>>2472228
>supporting amazon
assuredly codsworth?

What do you think about the Lora Protocol. I just made a TinyGS setup and i found it pretty cool. I can transmit as well, but they say i need a loicense, i live in a 3rd world country so im not sure if they care too much about that.

>>2472273
>assuredly codsworth?
Wut? I buy from Amazon anytime it meets at least two the following criteria. (Which is probably 95% of the time.)
- Lowest price
- Quickest shipping

>>2472163
antenna book no, but maybe Balanis, Cheng, or Griffith has some insight

NEW THREAD >>2472452
SWITCH CHANNEL >>2472452
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