Re: [Discuss-gnuradio] Benchmark scripts

[Steve Mcmahon]

Hello Thomas H Kim:

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 <address@hidden> wrote:

From: Thomas H Kim <address@hidden>
Subject: [Discuss-gnuradio] Benchmark scripts
To: address@hidden
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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