USRP as Spectrum

Could anyone kindly advice? Thanks!

I set the center frequency to 942MHz, believe to be the GSM

The spectrum is different from some samples and FM radio spectrums,
the peaks are widely across several MHz instead of spikes.

Then, I set the center frequency to 902MHz, which should be the GSM
frequency. There are some spikes, but with a constant spike at around

I read from the openBTS Manual, there are spikes in the downlink
from the operators’ BTS.
In my case, is there anything wrong in my config?

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