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Really good to know, hell yes I think that I want to goof off with building a bandpass or bandstop filter to see if I can figure out how to knock down some of the FM broadcast and uberpagers here. if I can figure out how to switch a filter in and out of circuit I think I can build a box that would hook up to Raspi GPIO pins to turn them on and off. but first i'd just build a single filter, get it working, then add diode switching, scale up from there
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Mar 17, 2014 18:44
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I finally got my pigtail so i hooked up my UT-106 and i can now dial down the gain to just 22 or so instead of like 40.
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Mar 17, 2014 22:19
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Also I'm listening to an FM broadcast at 863 MHz with some really, REALLY weird stuff when listened out of context. Audio clips from movies or smth???  e: it's Ocean's 13 now.
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Mar 17, 2014 22:20
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spankmeister posted:Also I'm listening to an FM broadcast at 863 MHz with some really, REALLY weird stuff when listened out of context. Audio clips from movies or smth??? somebody's wireless speakers? weird that it's showing up there though. suspecting intermod. is it a clean good signal?
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Mar 17, 2014 22:22
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Jonny 290 posted:somebody's wireless speakers? weird that it's showing up there though. suspecting intermod. is it a clean good signal? Ah that's probably it. It's weak but the signal is solid.
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Mar 17, 2014 22:22
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I checked and Ocean's 13 IS on right now soooo.
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Mar 17, 2014 22:25
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uploading an IQ file you can plug into SDR#, it has 3 signals you can differentiate. 1 is very weak but intelligible, 1 is a commercial, and 1 is ocean's 13.
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Mar 17, 2014 22:33
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https://dl.dropboxusercontent.com/u/78880053/SDRSharp_20140317_212914Z_863962kHz_IQ.wav
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Mar 17, 2014 22:35
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hittin' it. ill take a look isnt amazing that you can do something like that at all?
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Mar 17, 2014 23:27
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wtf that's weird. clean signals, sounds fine. where the hell are you that remote links like this are coming up on 863 mhz? the only other explanation i can give is images/intermod, but you got 3 good carriers there
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Mar 17, 2014 23:35
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Jonny 290 posted:wtf that's weird. clean signals, sounds fine. where the hell are you that remote links like this are coming up on 863 mhz? the only other explanation i can give is images/intermod, but you got 3 good carriers there Yeah, no clue. I'll have to do some triangulation or something. It's probably someone's wireless headphones or something, because i did find out that 863 is used by wireless microphones and headphones here in europe. I do live in a large apartment complex so there's a lot of signal density here anyway. I should really get a transmitter for those frequencies and start loving with people.
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Mar 17, 2014 23:43
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weird poo poo for the day: the world's last remaining non-electronic radio transmitter http://en.wikipedia.org/wiki/Varberg_Radio_Station quote:The transmitter was built in 1922 to 1924;[1] to operate at 17.2 kHz, although it is designed to operate on frequencies up to 40 kHz. The antenna is a 1.9 km (1.2 mile) flattop wire aerial consisting of eight horizontal wires suspended on six 127-metre high freestanding steel pylons in a line, that function as a capacitive top-load to feed energy to six grounded vertical wire radiating elements. hook a loving generator to an antenna and spin it such that it works at 17,200 hertz instead of your normal 50/60. Add a switch in line. Boom, an EMP-proof transmitter that requires more mechanical than electrical engineers to service http://en.wikipedia.org/wiki/Alexanderson_alternator They have a page where you can tune into the thing during its special broadcasts. the process: -hook up an amplifier to a long rear end piece of wire -hook the amp to your computer sound card -that's it it's basically SDR but you're not downconverting the frequency any
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Mar 17, 2014 23:44
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Jonny 290 posted:Really good to know, hell yes When I get home tonight, let me see what I can whip up in ADS. I feel like need to do something useful. Do you have any preference in how quickly the rejection band drops?
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Mar 18, 2014 13:19
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Zap! posted:When I get home tonight, let me see what I can whip up in ADS. I feel like need to do something useful. Do you have any preference in how quickly the rejection band drops? Not at all - just don't want to design something too picky that my gorilla hands can't build it, haha. My main pain is at 103.9 MHz, of course the local powerhouse has to be 'modern country'......
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Mar 18, 2014 14:06
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Jonny 290 posted:of course the local powerhouse has to be 'pop with accents'......
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Mar 18, 2014 16:00
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Jonny 290 posted:hook a loving generator to an antenna and spin it such that it works at 17,200 hertz instead of your normal 50/60. Add a switch in line. Boom, an EMP-proof transmitter that requires more mechanical than electrical engineers to service i'm the seventeen zillion poles I wonder if it's possible to carefully tune a tesla coil and transmit via arc antenna
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Mar 18, 2014 16:45
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if the input level to the PSA4 is is less than about -30 dBm you shouldn't need to put filters at the antenna here's some instructions i found on amplitude calibration https://forums.qrz.com/showthread.php?391657-RTL-2832u-R820T-SDR-as-a-Spectrum-Analyser using this my local super strong intermod-generator 80s station reads at about -55 dBm at this end of the coax, if i did my math right then the intermod from this station assuming about -50 dBm into the antenna would appear at -110 dBm (OIP3 at +30 dBm, gain = 25 dB -> IOP3 = +5dBm, delta signal is 55 dBm, intermod appears at -55*2 dBm), which happens to be the noise floor of this receiver but putting a filter before the SDR dongle makes perfect sense since we usually want the maximum gain in the dongle without intermod to overcome the A/D and mixer noise floor
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Mar 18, 2014 17:09
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this thread has got me ordering an sdr dongle from ebay now so i can learn about radio fuckery like you guys hey spankmeister is this like the one you got that works in 'yurp? http://www.ebay.de/itm/DVB-T-USB-2-...=item19c65baba2
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Mar 18, 2014 19:03
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Ripoff posted:this thread has got me ordering an sdr dongle from ebay now so i can learn about radio fuckery like you guys that looks identical to the one i got i just picked whoever had the most sold, or verkauft
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Mar 18, 2014 19:06
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PuTTY riot posted:that looks identical to the one i got i just picked whoever had the most sold, or verkauft ordered it, now gotta figure out if i want to install windows 7 on the mbp to play with the radio waves or if i should just use the old desktop box looking forward to scanning the airwaves and not understanding what the gently caress is going on
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Mar 18, 2014 19:58
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i want to listen to greybeards rant about obama and communism! what do I need to buy to do this?
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Mar 18, 2014 20:15
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in before "a computer"
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Mar 18, 2014 20:15
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Luigi Thirty posted:in before "a computer" i guess one of those dongles like i just bought, burn custom firmware, install software package, listen to guys piss and moan all day i'm looking forward to trying to listen in on some irc chat things and airplane transponders, it just sounds cool as gently caress and has always fascinated me
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Mar 18, 2014 20:21
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a radio
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Mar 18, 2014 20:21
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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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Ripoff posted:i guess one of those dongles like i just bought, burn custom firmware, install software package, listen to guys piss and moan all day oh yeah i read about the digital TV dongles that could be reprogrammed to receive any part of the spectrum worth listening to. i should get one of those though i figured once tech nerds figured that out they'd get expensive
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Mar 18, 2014 20:37
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Luigi Thirty posted:oh yeah i read about the digital TV dongles that could be reprogrammed to receive any part of the spectrum worth listening to. i should get one of those though i figured once tech nerds figured that out they'd get expensive nah mine was like 13 EUR and in the good ol USA you can probably expect around $10 its cheap chinese poo poo that i fully expect to work for no more than 3 months before burning out but that little money for entertainment is well worth it
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Mar 18, 2014 20:44
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Crankit posted:jonny what's the cheapest way to moonbounce? 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 Luigi Thirty posted:oh yeah i read about the digital TV dongles that could be reprogrammed to receive any part of the spectrum worth listening to. i should get one of those though i figured once tech nerds figured that out they'd get expensive 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 Jonny 290 fucked around with this message at 20:50 on Mar 18, 2014 |
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Mar 18, 2014 20:48
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before installing win7 there is a mac port of gqrx which works "ok" except i have to move the mouse cursor in circles as the program opens or there's a good chance the keyboard and trackpad will lock up & i need to hard reset
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Mar 18, 2014 21:03
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Ripoff posted:ordered it, now gotta figure out if i want to install windows 7 on the mbp to play with the radio waves or if i should just use the old desktop box u can put the dongle on ur desktop and run it over ur LAN but idk if theres a mac client.
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Mar 18, 2014 22:49
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atomicthumbs posted:I wonder if it's possible to carefully tune a tesla coil and transmit via arc antenna http://en.wikipedia.org/wiki/Spark-gap_transmitter ???
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Mar 18, 2014 22:55
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Ripoff posted:this thread has got me ordering an sdr dongle from ebay now so i can learn about radio fuckery like you guys Genau wie meine.
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Mar 18, 2014 23:04
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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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Crankit posted:jonny what's the cheapest way to moonbounce? its not moonbouncing but theres a sat w/ a VHF repeater that's fun to try to contact
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Mar 18, 2014 23:51
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Jonny 290 posted:in about two hours we're going to go out and see if we can pick up Saudisat SO-50 dis guy
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Mar 18, 2014 23:52
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yeah i should see if there are any passes tonight, maybe drag the rigs out http://heavens-above.com/ http://www.amsat.org/amsat-new/tools/predict/ oh and http://oscar.dcarr.org/ is the drudge report of ham satellites. once in a while you'll see my call pop up in the thanks list 
Jonny 290 fucked around with this message at 00:41 on Mar 19, 2014 |
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Mar 19, 2014 00:37
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testin the uhf discone i will never attempt to solder eight pieces of brass to copper pipe cap again the top was a bitch and it was still way easier to do its really solid tho 
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Mar 19, 2014 00:42
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Jonny 290 posted:testin the uhf discone im the paint roller mark on the ceiling. my daughter's room has a few
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Mar 19, 2014 00:44
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hahah i was waiting for somebody to say "nice dust bunny, slob" so i could be all "nah i just suck with a paint roller"
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Mar 19, 2014 00:49
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i think u have the same probably-asbestos popcorn ceiling my rental does
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Mar 19, 2014 01:04
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