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Re: [Discuss-gnuradio] HELP! Is it a defective USRP1?

From: Josh Blum
Subject: Re: [Discuss-gnuradio] HELP! Is it a defective USRP1?
Date: Tue, 09 Nov 2010 15:29:37 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Thunderbird/3.1.6

Try a higher rate (spectrally wider symbols). Maybe its an issue of frequency offset. -Josh

On 11/09/2010 02:34 PM, Rachel Li wrote:
Hi All:

I am experiencing something strange with USRP1 and already tried a lot of
approaches to diagnose where the problem is, but no luck so far.

We have two USRP1, each of which has a RXF 2400 daughter board and an
antenna connected to the Tx/Rx port. When we run benchmark (benchmark_tx.py
and benchmark_rx.py), the packet loss/corrupted rate is very random (from 0%
to 99%).

We've tried several approaches to diagnose where the problem, including
(1) connect the Tx/Rx ports of two USRP by a SMA connector
(2) try both sides of the mother board (A and B) ,
(3) use different central frequency from 2.4G to 2.48G,
(4) adjust the carrier threshold (20 to 50), tx amplitude (0 to 1) and rx
gain (0 to 90),
(5) place the radios in different locations,
(6) use different versions of gnuradio (stable release version 3.3.0 as well
as the latest repository code)
(7) place a fft sink at the rx to observe the spectrum, I can see the signal
spectrum showing up when tx is transmitting something.

Unfortunately, nothing really helps.

Is it possible that it is a defective USRP?

I really appreciate if anyone of you could guide me with this problem
because I have a deadline to make in around 2.5 weeks.

Thanks very much!


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