Re: [Discuss-gnuradio] Modifications in benchmark_rx.py for USRP2

[Tom Rondeau]

Smith L. wrote:
> Hi,
>
> I have been trying to use USRP2 as a receiver and USRP1 as a transmitter.
> The benchmark_tx.py file is working well for USRP1 but I did some
> modifications to benchmark_rx.py so that it can work on USRP2. But it didnt
> worked out. Can anyone help me with this modifcations so that I can
> establish communication between USRP1 and USRP2. Thanks in advance.
>   

You have to watch out for the different sample rates. When you set the 
sample rate in benchmark_tx/rx, it finds the closest sampling rate it 
can get through the interpolation/decimation factor in the USRP. Since 
the USRP and USRP2 have different speed DACs/ADCs, the exact values are 
going to be different.

Run both with the -v option to see what the actual sample rate both the 
tx and rx side are using. To fix this, either try to find a rate that 
works for both USRP and USRP2, or, and this is a better solution, use a 
blks2.rational_resampler_ccf to resample to achieve closer sampling 
rates in both tx and rx.

Tom