Anyone have a guess as to the source of this noise? I'm hearing it on HF in SSB mode. Loudest on 160, loud on 80, 40, & 20. Starts to fade in 15 & 10. There, but really weak, on 6m. If I turn on the
kd4e For my purposes, I need it demodulated with an "envelope detector", this means in AM mode. SSB is too narrow to really do noise sources justice. Thanks. 73 de AA5CT Jim . . On Thursday, February
Good point ... How about this? AM mode on 14.256 "http://nevils-station.com/stuff/sounds/20feb2020-14256-radiostatic2.m4a" kd4e For my purposes, I need it demodulated with an "envelope detector", thi
kd4e, To my trained ear that sounds like a power line arc. Also, given your description of how broad-banded it is. Also, noise blankers in most rigs work on low rep-rate, narrow impulse noise (like a
Looking at it on Audacity, you can see regular narrow pulses of 12 per tenth of a second. Also other (maybe 4 more) wider pulses of 12 per tenth of a second. So 120hz, it looks like maybe several pow
The most useful "picture" of RF noise is a spectrum and waterfall, at least 200 kHz wide. Wider views can also be quite useful. Study NK7Z's website. 73, Jim K9YC ____________________________________
In the "olde days", Jim, we would tune across the band and note any similar buzzes at xx kHz apart IF indeed we could find any more 'buzzes'. With powerline arcs, the spectra is continuous, there ar
How much simpler SDR has made this sort of thing... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Reso
Dave, When one only really need *one number* (the spacing between the carriers that one is observing ) we've actually taken a bit of a step back. The question to be asked when observing un-ID'd spect
Jim, The advent of SDR has placed tools in the hands of folks that never could afford the tools you speak of... Most folks I know can't afford a spectrum analyzer, hence why SDR has made a very subst
This is not the "olde days," Jim. This is 2020, and there are new tools available to diagnose problems. I've been contesting since my high school days (the late '50s) when I logged on paper, kept pap