0350z it is back and loud again (40dB over s9) and has QSB. This site shows how Codar systems work http://www.ims.uaf.edu/hfradar/how_it_works/
the sound clip on that page has audio that is higher-pitched than the one on 1915 but similar in structure. 73, Doug K1DG On Tue, Dec 9, 2014 at 3:44 AM, Ray Benny <[email protected]> wrote: > Guys, > > I am hearing something between 1910 and 1925. Its a rapid, raspy, pulse > tone, but its coming from the SE in Central AZ (SA direction). It is just > above my noise level, currently S4, so not strong. Do not hear it on my TX > vertical. Don't know if this could be the noise reported or some local > garbage in my area. > > Using a HI-Z RX 4 SQ. > > Ray, > N6VR > > On Mon, Dec 8, 2014 at 7:13 PM, Doug Grant <[email protected]> wrote: >> >> > From: [email protected] >> >> > Monday? 9;45 AM >> > Unable to hear the 1900-1925 Khz. interfering signal this morning. >> > Propagation change, or is the signal gone ? >> > Anyone still hear it? >> >> I checked a few times during the day on Monday and did not hear it. >> >> At 0200z I checked again and it was there and very loud...40dB over >> s9. Definitely louder on my NE antenna, but only by 10 dB or so. Maybe >> it is close enough that it is arriving at a high angle. But 30 seconds >> after I tuned in, it stopped! >> >> The signal characteristics are almost identical to CODAR sea-surface >> radar. There are three of those installations in Maine and VE1 that >> are easy to hear on 4.8 MHz. Maybe they are trying smoethign new >> there. Or maybe is it in TF or even shipboard somewhere off >> Newfoundland...the CODAR system uses fairly small antennas and low >> power, so it is possible. >> >> I placed a phone call over the weekend to the Operations Manager for >> one of the projects using those sites and left a message asking if >> they had something running at 1.9 MHz, but no answer yet. >> >> 73, >> >> Doug K1DG >> Long Island, ME FN43 >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
