PuTTY riot posted:ya i started lookin on CL and theres a couple 122 buck on Ebay http://www.ebay.com/sch/i.html?_kw=Tektronix+2247A+Oscilloscope goddam CL rapists
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Feb 26, 2014 04:04
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Tangra posted:122 buck on Ebay ya but theres another day left in that auction
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Feb 26, 2014 04:05
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I have this baseball card that's worth $10,000 cause someone on ebay has one for sale for that much
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Feb 26, 2014 04:05
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maniacdevnull posted:i need to go dumpster diving where you live 57.6kbaud traffic you could spy on with a good sound card
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Feb 26, 2014 04:48
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bloody you are an ee right?
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Feb 26, 2014 05:09
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technically yes
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Feb 26, 2014 05:28
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ive only once debugged a serial port with a sound card it was a funny and awful experience and i dont really recommend it
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Feb 26, 2014 05:30
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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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Crankit posted:incidentally that's manhattan construction, not dead bug. Yeah there's a 6 lead DIP in the upper right corner that is laying the wrong way for a dead bug. Jonny, this thread is awesome.
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Feb 26, 2014 15:02
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Crankit posted:incidentally that's manhattan construction, not dead bug. <--shame you're correct though  i love the angry greybeard thread
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Feb 26, 2014 15:23
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so the US really has everything allocated in terms of radio waves except for the lower 3 kHz range?
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Feb 26, 2014 15:26
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what is a good, relatively cheap (let's say up to $200 used) 2m/70cm radio for a beginner? i got my license almost a year ago and haven't used it at all. i live in dc, so i imagine the longer waves are prob not best for me
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Feb 26, 2014 15:42
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yeah, that doesn't mean they're actually used though. We may have 28 mhz of shortwave bands allocated all told, but there are only like four or five domestic shortwave stations and the only non-religious one, Voice of America, isn't allowed to target US citizens. It's meant for international listeners only. This rule is stupid and backwards.
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Feb 26, 2014 15:42
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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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Jonny 290 posted:poo poo i wish it's clean but you can tell it's basically a DC circuit by all the right angle bends all over the place air-wired over a copper ground plane except for one part I saw in the power supply, don't know what you'd call that
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Feb 26, 2014 17:12
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http://pittsburgh.craigslist.org/ele/4318150290.html i'm guessing by the look of the thing that this would be more of a novelty than a useful tool, what do you guys think 
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Feb 26, 2014 17:20
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also this http://youngstown.craigslist.org/ele/4284528224.html
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Feb 26, 2014 17:21
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Endless Mike posted:what is a good, relatively cheap (let's say up to $200 used) 2m/70cm radio for a beginner? i got my license almost a year ago and haven't used it at all. i live in dc, so i imagine the longer waves are prob not best for me Seems like some people like these BaoFeng cheap HTs as beginner radios/throwaways. For $40, seems like a real cheap way to get hooked until you get a better rig.
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Feb 26, 2014 17:37
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wow nice fuckin WAP site from 2002
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Feb 26, 2014 17:39
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http://hamgear.wordpress.com/2014/01/04/chinas-best-and-worst-of-2013/
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Feb 26, 2014 17:44
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can you get a vanity callsign? do hams east of the Mississippi get W callsigns like radio/tv stations? if possible id really like to have one that starts with whiskey mike even better get whiskey romeo and connect it to an arduino that just blasts out random posts from the reddit pua board on cw
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Feb 26, 2014 17:46
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 that's the yosposest thing i've seen in a while
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Feb 26, 2014 17:53
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Zap! posted:Seems like some people like these BaoFeng cheap HTs as beginner radios/throwaways. For $40, seems like a real cheap way to get hooked until you get a better rig.
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Feb 26, 2014 18:00
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any good resources for studying for license?
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Feb 26, 2014 18:28
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from one traffic cone to another, i bring you this quotePuTTY riot posted:heres what seems to be a pretty good study website, i like that it tracks progress on each subelement so u know what to work on:
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Feb 26, 2014 19:02
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this is probably a better bet. If you want to test to make sure it can at least display a trace, make a little 1/8" plug cable with just stripped wire ends and bring it when you go look, then play some music through your phone through the cable and hit the bare wire with a probe (dont forget to hook up ground too), you should see the music bumpin' on the scope if they don't have a probe and claim it works, tell em to kick rocks
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Feb 26, 2014 19:35
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thanks jonny ur the best <3 e: Jonny 290 posted:if they don't have a probe and claim it works, tell em to kick rocks BK PRECISION 1472C 15 MHz, TRIGGERED SWEEP, Sorry no PROBES Good for Ham Shack. welp
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Feb 26, 2014 19:46
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today i decoded some p2000 emergency services pager signals using my RTLSDR dongle and some software: p. neat
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Feb 26, 2014 19:51
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spankmeister posted:today i decoded some p2000 emergency services pager signals using my RTLSDR dongle and some software: super hot, nice. feel free to kick deetz on the software down, I don't know poo poo about the rtlsdr stuff yet and am ordering a dongle tomorrow
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Feb 26, 2014 19:53
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if i buy that cheap handset you mentioned in the cj thread what can i do with it? the one that whoever the gently caress bought
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Feb 26, 2014 20:03
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Jonny 290 posted:super hot, nice. feel free to kick deetz on the software down, I don't know poo poo about the rtlsdr stuff yet and am ordering a dongle tomorrow ok so i got a DVB-T dongle with the RTL2832U and a RT820 tuner chip. the 820 has a bit less range on the high end than the E4000 (1800 ish vs 2200 is) but the E4000 has a gap around 1.2Ghz or so? I'm not 100% on these numbers but ballpark. then i used SDR# (google for sdrsharp) which is a good program for working with these things. Looks like this:  (not my pic) e: the usb driver is finicky for this setup, the sdr-install on http://rtlsdr.org/softwarewindows takes care of that then you have to have a monitor mode thingy on your soundcard, on some cards it's called "stereo mix", or "what u hear" or something. this is so you get the audio output from SDR# into the decoder software the software to decode pager stuff is called PDW, it does all kinds of pager protocols. the screenshot i posted in my previous post is PDW. it's real finicky to set up right because you have to get the levels properly set up and there's like 5 different places you can set volume. i couldn't get anything to work right until i found this guide: http://www.rtl-sdr.com/rtl-sdr-tutorial-pocsag-pager-decoding/ the thing i was having trouble with was fixed with these settings: Tune to a pager POCSAG/Flex signal. Set the receive mode to NFM, filter bandwidth to 12500 Hz, filter order to 10, and turn squelch OFF, and filter audio OFF. Adjust the RF gain settings under the Configure menu until good reception is achieved. PDW does a whole bunch of protocols. the only thing to remember is that you can only do 2FSK this way, if you want 4FSK you need a "discriminator" or whatever. spankmeister fucked around with this message at 20:09 on Feb 26, 2014 |
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Feb 26, 2014 20:04
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transfatphobic posted:if i buy that cheap handset you mentioned in the cj thread what can i do with it? yeah i reckon you can if the pager freqs in the us are in the range of what the baofeng can receive. all you need then is a sound card and a whole lotta time to mess with a 100 gain sliders
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Feb 26, 2014 20:05
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spankmeister posted:ok so i got a DVB-T dongle with the RTL2832U and a RT820 tuner chip. the 820 has a bit less range on the high end than the E4000 (1800 ish vs 2200 is) but the E4000 has a gap around 1.2Ghz or so? I'm not 100% on these numbers but ballpark. Very informative! We should experiment with the other modulations because a discriminator tap is just a wider signal without any lowpass filtering, i'd imagine we can figure it out. super excited to get that thing now
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Feb 26, 2014 20:15
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Jonny 290 posted:Very informative! We should experiment with the other modulations because a discriminator tap is just a wider signal without any lowpass filtering, i'd imagine we can figure it out. the creator did opensource it a while ago so there are certainly possibilities.
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Feb 26, 2014 20:17
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there's some ERMES signals flying around here which is 4FSK so i can do some testing.
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Feb 26, 2014 20:19
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fuckit i'm emailing about the old tektronix. i don't care if it's less "useful," it is dope
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Feb 26, 2014 20:22
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what else can you do with an rtlsdr? yeah, that's right. motherfucking airplane transponders bitch! next up is plotting them on a map but planeplotter is being annoying
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Feb 26, 2014 21:04
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the google map plugin isn't working but here's a live chart of overhead planes:  i think i'm at the limits of my setup SNR wise because i'm missing data but the standard whip antenna that comes with it has worked so far. it's inside on my desk and i've made no effort on placement or w/e.
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Feb 26, 2014 21:12
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Werthog 95 posted:fuckit i'm emailing about the old tektronix. i don't care if it's less "useful," it is dope dammit ive been eyeballing that thing for like two weeks hemming and hawing over whether i'd buy it although i guess if you buy it that makes the decision for me and its not like i have anywhere to put it right now anyway
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Feb 26, 2014 21:53
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already emailed the guy  asked him about probes and he said he'd send some pics on friday since he's in harrisburg right now
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Feb 26, 2014 21:56
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