[Discuss-gnuradio] USRP internally generated signal at 1088 MHz

[Eric Cottrell]

Hello,

I got the DBSRX board back working but noticed if I run the USRP_FFT program a 
20 db above the noise signal appears at 1088 MHz.  It is there if the antenna 
is disconnected and moves up and down with the gain.  It will decrease and go 
away as the gain is moved from about 26 down to zero but then so does the 
desired signals.  The 1088 MHz signal goes away if I set the decimation to 16.  
I changed the VCO divider from x4 to x2 with no change.  It seems to be a 
signal generated on the USRP board that is getting into the frontend of the 
DBSRX.

I noticed it before the board broke but did not think anything of it until I 
realized that it is increasing the noise level and decreasing performance.

I have the board in the RX B slot.  I will try it over on the RX A Slot tonight.

73 Eric