I have observed a similar phenomenon with the LFRX daughterboard. It seems
there is often (or always?) a peak at DC in the baseband (USRP output)
spectrum, regardless of the tuned frequency of the USRP. I suspect it is
due to rounding down in the CIC decimation filter. Adding a value of
e*complex(1.0,1.0) where 0.5 <= e <= 0.8 to the USRP output will cancel it.
-- Don W.
----- Original Message -----
From: "Luis Simoes" <[EMAIL PROTECTED]>
[snipped]
As I feed the USRP with a single sine tone with a frequency of 2.444 GHz
and
an amplitude of -50dbm I saw on my plot a nice peak at 2.444 GHZ but also
a
second peak at 2.452 GHZ but attenuated by 15 db's when daughter board is
tuned to 2.452 Ghz.
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