a doppler fox hunt antenna system would get the direction also. Joe WB9SBD
The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 2/8/2011 5:49 PM, Bob Bruninga wrote: >> Has anybody else heard this -- >> http://mysite.verizon.net/vzeqe0l7/Signal_436MHz.wav >> The signal strength is not constant - >> and peaks about every 10 seconds - - >> A new radar perhaps? > The 10 sec rotation rate nails it as an E6C Radar plane. Probably operating > off the East Coast. I have been hearing it periodically for years, and > getting ready for a satellite receive lab this week, it would have > completely spoiled the lab. So I spent over an hour on the web and on the > phone and finally got in touch with the right folks and when I said "10 > seconds" they didn't need any more. That nailed it to an E6. > > They are not supposed to operate on the UHF channel that overlaps the > 400-420 MHz band anywhere near land, but it is unclear what the guidance is > for the band 430-450 where HAMS ARE SECONDARY. > > The above is my understanding, might not be exact. > > To locate it would be hard... Swinging the beam doesn't help much, because > the radar is rotating at the same time and giving all kinds of fluctuations > per second... which would mask your attempts at peaking on it. > > My best guess to locate it would be to get two hams on the phone separated > by several hundred miles and to TIME the difference between the peak. That > would establish an angle from the radar between the two hams. Then both > hams compare signal strengths to an OMNI antenna (must be omni) and both > must be calibrated for equal S meter readings. The difference in peak > signal strength would get an idea of range ratio between the two stations. > That and the angle (and ignoring the mirror solution over land) would get > you a good idea where he is operating. (Maybe?) > > Bob, WB4APR > > _______________________________________________ > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
