----- Original Message ----
From: Stefan Brüns <address@hidden>
To: address@hidden
Sent: Thursday, October 9, 2008 2:11:15 PM
Subject: Re: [Discuss-gnuradio] a question about benchmark_rx.py and benchmark_tx.py
On Thursday 09 October 2008 19:47:10 Bill Stevenson wrote:
> Hello, everyone!
>
> I am just running a demo program to realize communication between two usrps
> using benchmark_rx and benchmark_py under the Python/digital dir. But when
> I am trying to use dqpsk modulation scheme, the packets received are
> totally wrong. What's wrong with the programs? I am really confused. Could
> anybody give me a hint or help me out? Thank you!!!
>
> Bill
I had a problem with different oscillator frequencies on two boards, not much
but enough for the digital pll in the receiving gnuradio block to lose
tracking.
As a workaround, I used the
usrp_fft.py programm as a receiver, and on the
sending side just a carrier. This way, I could determine the frequency offset
between the two boards.
Stefan
--
Stefan Brüns
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Hello, Stefan
I am sorry but I cannot quite follow your instructions, could you please give me more specific instructions on this problem? Is loosing tracking related to my problem? What do you mean, using usrp_fft.py as a receiver and sending side just a carrier? Thank you!
Bill
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