[Discuss-gnuradio] Stepping and Tuning USRP Source

[Yan Huang]

Hi all,

 

I want to ask some questions about gnuradio:

 

1.I want to use UHD: USRP Source to receive signal with 60MHz bandwidth, and I divide it into 30 channels, and each time the usrp source receive 2MHz bandwidth signal, and then improve the center frequency with step=1.5MHz. I know I need to set the USRP center frequency as:

uhd.tune_request(center_freq, rf_freq=(center_freq + lo_offset),rf_freq_policy=uhd.tune_request.POLICY_MANUAL)

But I don’t know how to change the center frequency from the min_frequency to max_frequency with each step.

 

2.And then I connect the USRP source ->steam to vector->FFT->vector to stream->file sink, if FFT length is 256, sample rate is 2MHz, the sample number in the file sink is also 256(if I use overwite)? If not, how many number is in the file sink?

 

Is anybody familiar with these? Thanks in advance.

 

Best Regards,

 

Yan

 

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