[Discuss-gnuradio] spectrum repeats at 64MHz

[cesar]

Hello

Im new in GNUradio and I am trying to build a spectrum analyzer using a 
USRP, to sweep the spectrum from 0 to 112 MHz. In order to scan the 
total 112 MHz window, I see individual 8 MHz bandwidth windows at a 
time. But I see that at 64 MHz the spectrum repeats.

My question is why the spectrum repeats at 64 MHz? and how can I solve 
it?

Somebody can help me please?

The features of the USRP are:

ADC sample rate = 64 MS/s
clock frequency = 64 MHz
daughterboard = BasicRX with range 1-250 MHz

I attach the spectrum of the 0-8 MHz and 64-72 MHz windows to example 
the case and my flowgraph in GRC.

Thanks for the help

--
César I. V. Ceballos
IRYA-UNAM, Campus Morelia
Michoacán, México

spectral_windows.pdf
Description: Adobe PDF document

flowgraph.png
Description: PNG image