[amsat-bb] Re: Strange Signal - 436Mhz - (sample provided)
nss at mwt.net
Tue Feb 8 16:01:57 PST 2011
a doppler fox hunt antenna system would get the direction also.
The Original Rolling Ball Clock
On 2/8/2011 5:49 PM, Bob Bruninga wrote:
>> Has anybody else heard this --
>> 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 at 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
More information about the AMSAT-BB