I assume you have the two clocks synchronized. There is a 10 MHz reference clock input on the front of the USRP2. But on the USRP you need to get a soldering iron and modify the hardware a little (I think you need to remove a resistor, or something like that) to add a 10 MHz reference input.
You could also the use the 1 PPS input for your two USRPs.
Let me know if this helps.
Steve
--- On Mon, 1/10/11, Thomas H Kim <Thomas.H.Kim@aero.org> wrote:
From: Thomas H Kim <Thomas.H.Kim@aero.org>
Subject: [Discuss-gnuradio] Benchmark scripts
To: discuss-gnuradio@gnu.org
Date: Monday, January 10, 2011, 3:55 PM
All,
I am testing 2x USRP1 with RFX2400 daughter
cards with benchmark_rx and benchmark_tx scripts and have questions.
When I set the MCS to dbpsk, error rate
I got was close to zero.
When I set it to dqpsk, d8psk, error
rate is 100%.
When I set it to gmsk, certain daughter
cards had close to 0 error rate, but certain swung from 0% to 100%.
I asked about it to Ettus research,
they told me that it's likely to be due to frequency offset between the
two boxes I have.
If it is true,
1) how can I compensate the offset?
2) Has someone used dqpsk, d8psk in
2.4MHz ISM band before? If so, what extra step is necessary?
Thanks,
Thomas
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