Re: [Discuss-gnuradio] A longish-term drift study of the USRP/DBS_RX combination

[Chuck Swiger]

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