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

[Tom O]

Eric A. Cottrell wrote:
> 
> 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
> 
> Eric,
> 
> I notice the interference at 1088 MHz also.  What have you done to
> mitigate the interference?  Did you modify the caps as stated by Matt?
> 
> Tom
> 
> 
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> 

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