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Re: [Discuss-gnuradio] benchmark test between two USRPs have different p

From: Weixian Zhou
Subject: Re: [Discuss-gnuradio] benchmark test between two USRPs have different performances in two directions
Date: Wed, 8 Aug 2012 13:31:50 -0400

Hi Josh,
The tone test works. And I have tried to use different antennas. The following is the result:

The results are very different even with same antennas. The n_rcvd/n_right is 626/623, and 289/0 sometimes. What might be the reason?

On Sat, Aug 4, 2012 at 1:53 PM, Josh Blum <address@hidden> wrote:

On 08/03/2012 03:45 PM, Weixian Zhou wrote:
> I run benchmark_tx in USRP A, and benchmark_rx in USRP B:
> A: ./benchmark_tx.py -f 2.46G -r 0.5M --tx-gain=-30
> B: ./benchmark_rx.py -f 2.46G -r 0.5M
> The n_right/n_recvd is 549/628.
> But when I rx in USRP A and tx in USRP B with the same parameters, the
> n_right/n_recvd is always pretty bad: 0/275.
> What might be the reasons?

0/275 doesnt sound like a performance difference. Something is just not
working, or incorrect setup, antenna issues.

Before experimenting with the mac layer examples in gnuradio, it might
be good to verify setup connectivity and signal integrity, etc.

have you verified functionality of your setup with a simple test tone?
Check the the correct antennas are used. correct frequency comes out,
reasonable power level.


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