One of the interesting things about having a panadaptor is being able to "see" rather than just "hear" what's going on in a small spectral region. I see all kinds of things racing across the screen, noise-floor bumps, etc. But, now that I can "see," I'd never willingly give it up. I can find holes in wall-to-wall contest-related signals to plop down and run Qs, I can see activity level in a 50 KHz segment of a band and move from signal to signal instead of slowly tuning through the dead air from one to another. I hope I never get jaded by it :-).
Rob K6RB > On 12/4/2011 1:08 PM, Fred Jensen wrote: >> A group of very narrow noise pulses, not terribly strong, run >> through the display at maybe 5 or so KHz/sec, usually from high to low >> frequency. I might have heard them once or twice, generally there's no >> audio indication. I disconnect my antennas when I'm not using the radio >> but leaving it on, and I've never seen them then. > > Signals like this are quite common here in northern California. I don't > know their source, don't know if they are intentionally "signals" .or > unintentionally radiated noise. I find that I can often hear this stuff > in my headphones. > >> >> 2. A more broadband, bump in the reference level runs across the >> screen, maybe 20-25 KHz/sec, again usually down in frequency but not >> always. It's definitely some sort of broadbandish signal coming in on >> the antenna. I've never heard anything as it goes by. I'm about 25 mi >> from Beale AFB with the PAVE PAWS radar and numerous other electronic >> systems the USAF never talks about. I'm a bit suspicious, but it's >> certainly not a problem. > > This sounds like typical trash from electronics equipment and their > switching power supplies. Can be anything from battery chargers to 12V > switching PSUs for low voltage lighting to computers to various > microprocessor-based equipment of all sorts. The fact that stuff like > this is not audible is largely due to AGC smoothing out the increased > noise level when we tune across it. > > 73, Jim K9YC > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
