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what percentage of hams are sperglords?
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Feb 25, 2014 16:58
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| # ¿ May 4, 2024 17:49 |
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Shaggar posted:i think it would just be kind of interesting to play w/ radio gear to send digital signals for funsies. getting licensed sounds like a pain tho. In the US it's an easy exam and it costs about $15.
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Feb 25, 2014 17:07
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did jonny mention homebrew radios? that probably would interest some guys. i think the amateur radio service is the only licence that lets you build your own radio and operate it, that's what interested me, not the thing that old guys tend to mention: you can talk around the world using the same power aas a lightbulb.
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Feb 25, 2014 23:19
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Jonny 290 posted:dead bug is still a valid construction method for RF circuits incidentally that's manhattan construction, not dead bug.
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Feb 26, 2014 13:14
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Zap! posted:Yeah there's a 6 lead DIP in the upper right corner that is laying the wrong way for a dead bug. and all the other components too, with dead bug the majority of component legs would be joined up in the air, but that board has little islands of copper plated board which i guess are like manhattan? here's a vid of a dead bug circuit being made https://www.youtube.com/watch?v=cQs8W9FaoTU and manhattan circuit https://www.youtube.com/watch?v=7qXnRevkVw0 skip to 2 minutes in on both Zap! posted:Jonny, this thread is awesome. yes
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Feb 26, 2014 17:09
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Bloody posted:whats a qrper qrp is a morse code abbreviation that means reduce power, qrp guys use low power transmitters. <10W for voice <5W for morse
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Mar 11, 2014 16:06
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jonny what's the cheapest way to moonbounce?
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Mar 18, 2014 20:29
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Jonny 290 posted:the easy answer is 'build a moderate station and set up a schedule with a famous big gun EME operator'. technically? i wouldnt even try without four high-gain yagi antennas (like 20+ foot booms at 2 meters), $3.00 a foot coaxial cable, between 500 and 1000 watts of RF power, low noise preamps and a lot of planning and patience. and even then you're pretty much back to the above, schedule contact attempts with a big dude and see if his superior antennas can make up your shortcomings. figure no less than five grand to get yr feet wet gently caress Jonny 290 posted:on the contrary it's introduced a shitload of people to radio and the factories are openly packaging them as "DTV/SDR stick" devices. nooelec is 100% on board. i think we hit that critical mass point where its sensible for them to scale up the chip fabs, and the manufacturers dont care if we're watchint dtv or sticking them up our butts the stick at least partially got me into radio.
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Mar 18, 2014 23:47
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ah'm touchin mah ham right now
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Mar 19, 2014 04:05
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don't get those, get a kx3 instead
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Mar 30, 2014 17:59
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so why is it clear, so inmates can't hide things in them, or so they no people aren't using it as a science kit that will help them escape?
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Apr 2, 2014 17:44
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Jonny 290 posted:so i just learned that there's a narrow band around 13500 khz that is Part 15 okay. We can have a shortwave station with like 10 mV/m field strength, which is about 2 milliwatts into a full size dipole. Isn't there an ISM band from something like 6765 to 6795kHz, are you allowed to transmit there too? Not sure if that would be easier to pull a crystal down to?
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Dec 22, 2014 07:19
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A Yolo Wizard posted:Really because I asked you three times in irc last week and pasted it in and you never responded hello is this like a fpv thing, what do you use it with, tell me about it
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Dec 23, 2014 09:37
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i think it's a cloverleaf antenna that produces circularly polarised radiowaves
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Dec 27, 2014 05:52
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for crystal radios i think you can often hook a dds up to the crystal socket which then makes the rig frequency agile.
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Jan 8, 2015 23:26
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Jonny 290 posted:Adding to wishlist: the kit price doesn't seem too bad but what does it do, is it an fsk tnc for tx and rx
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Jan 9, 2015 19:24
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can it do psk or qam, i'd be very interested if it did them
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Jan 9, 2015 19:48
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what's the diff between a tcxo and an ocxo
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Jan 9, 2015 21:30
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Cocoa Crispies posted:is this a police/emergency radio or something that transmits on multiple frequencies? I think you're slope detecting an FM signal there, does your SDR software have an NFM or NBFM option? Can you try that and also record it see if it's any different.
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Jan 13, 2015 22:12
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Doesn't the AFEDRI sdr do a very similar thing to the utwente sdr
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Jan 14, 2015 02:00
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PuTTY riot posted:idgi but cutting the fan out to wire them in series was a bad idea. its so loud tho. good thing ive got 3 of these fuckers. can you really wire them in series? i'd a thought the negative would be connected back to ground.
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Apr 21, 2015 11:37
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oh the fan! for some reason i was thinking wiring server PSUs in series
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Apr 22, 2015 23:21
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PuTTY riot posted:yeah it def seems shady sorry if it sounded like i was suggesting doing it. idk what use radio folk would have for 24v unless they're using weird military radios or chargin bat-trees well, there's military, but also some transistors like IRF510s work better at 28V like in the WA2EBY amplifier. also some telecom amps work off of 28V like the ones they use in cell towers based off the MRF21090(I think) etc transistors. MRF21xxx transistors on ebay are probably the cheapest wat to get 30/90/110W at 2.3GHz
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Apr 23, 2015 11:55
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oh poo poo in 2 years we might have two geostationary birds?
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Apr 26, 2015 12:43
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BANME.sh posted:i was driving the other day and i realized how weird it is that vehicles still come with a giant antenna on them for FM radio, but you can get little bitty electronics with FM capabilities that work fine. for example my old zune had FM and no big honking antenna on it. why are the big ones still needed. range i guess? normally when phones or mp3 players can tune an fm radio they use the headphone cable as an antenna
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May 25, 2015 23:25
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Jonny 290 posted:though two radios is strongly suggested for satellite work i was thinking about this the other day, you only need 1 for transmit right, the other is rx only? so would a 857 and an rtl-sdr be a good combo? assuming you're in a situation where you can use rtlsdr and a computer
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May 27, 2015 13:29
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| # ¿ May 4, 2024 17:49 |
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Jonny 290 posted:and THEN there's the elecraft koolaid drinkers i think elecraft radios are pretty neat personally, if you don't want a panadapter, don't buy one, if you don't want neato crystal filters, don't buy em v0v what you're paying for is cw performance, the filters are p good, the phase noise is good, the key clicks are good afaik the big3 don't really compare for cw performance what i wouldn't do is buy their amps quote:also how do you know if somebody's an elecraft owner? LOL JUST WAIT lol 110% true
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Jun 7, 2015 22:15
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