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

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] HELP! Is it a defective USRP1?
Date: Tue, 09 Nov 2010 18:02:36 -0500
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On 11/09/2010 05:34 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!
> Rachel
My suggestion is that you use a more basic diagnostic.  Do both USRPs
have roughly the same
  sensitivity and output power?

If you transmit on one, and receive on the other with a FFT, with an
attenuator between them,
  can the Rx side "see" the other side, use increasing levels of
attenuation until the Rx can't
  see the transmitted signal anymore.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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