Re: [Discuss-gnuradio] benchmark_ofdm_rx not working

[Tom Rondeau]

Archana Ragothaman wrote:
> Hello,
>
> I am using two USRPs rev 4 and two RFX2400. I am basically trying to 
> make the USRPs communicate with each other using the 
> benchmark_ofdm_tx.py and benchmark_ofdm_rx.py scripts. The commands I 
> am executing are
>
> ./benchmark_ofdm_tx.py -f2.4e9 -T A (at one USRP connected to laptop)
>
> ./benchmark_ofdm_rx.py -f2.4e9 -R A (at the other USRP connected to 
> another laptop)
>
> The benchmark_ofdm_tx.py script is working as I can see the packet 
> number displayed(I wrote a print pktno in the script)
>
> However the benchmark_ofdm_rx.py script does not give any output. I 
> don't think the rx_callback function is being executed(as the packets 
> are printed in that function).
>
> Can anyone please help me out and give suggestions as to what the 
> problem could be?
>
> Thank you.

First, try running the benchmark_ofdm_tx on one side and tht usrp_fft to 
display the received power at the receiver. What does this look like?

The problem is likely that you are not transmitting enough power. There 
is a --tx-amplitude flag to adjust this. Set it to 2000 - 4000.

Tom