At 08:39 AM 1/10/2006 -0500, you wrote:
Attached, y'all will find a plot of the total power detected with my
receiving setup:
21cm feedhorn--->LNA->DBS_RX->USRP
This is with the feedhorn covered with aluminum foil.
The 40-minute cycle is something that appeared in my other receiver a
couple of years ago, so I suspect
it may be due to the heat cycling in the house.
Very interesting - of course the Y scale is a really mangified range
of only 0.04, which may or may
not be significant. There's always batteries for ultimate isolation - I
run the USRP off a 7ah 6v
sealed lead/acid battery. Also you could make your setup portable and
take it out away from
civilization. Believe me, there's nothing like explaining shortwave or RA
antennas to a park ranger
an hour after dusk, who just stopped by to check up on you. ;))
--Chuck
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