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Re: [Discuss-gnuradio] Question about tx&rx examples

From: Milo Wong
Subject: Re: [Discuss-gnuradio] Question about tx&rx examples
Date: Mon, 10 Aug 2009 08:10:24 -0700

HI all,
I guess it might be the temperature issue, cause I used a small fan to pump out the heat and the receiving part could come back to work. However, I still have to power cycle to receive in the second example(gnuradio-examples/digital/benchmark_tx&rx.py). Confusing. Anyway, thank you all for the help!

On Sat, Aug 8, 2009 at 5:41 PM, Umair Nasir <address@hidden> wrote:
without changing the whole usrp for recieving, try changing the usb cable only. I had this strange problem with the usb cable that it would transmit but not recieve.

On Wed, Aug 5, 2009 at 12:16 AM, Milo Wong <address@hidden> wrote:
Hi All,

I got problems in running gnuradio-examples when I tested the USRP boards: (Ubuntu9.04/gnuradio-3.2.2)
Example 1) OFDM_Tx&Rx (../gnuradio-examples/python/ofdm/benchmark_ofdm_tx&rx)

By the time so far, I have several different kinds of outcomes by different attampts even I tried with the same command. It seems that it never has a "stable" same outcome. The problems I have met so far include the following (these are different experiences that I have had when running the tests at different times):

   -1, One of the USRPs always can not receive, even though I attempt to power cycled it or stop receiving and restart again without power cycling. I labled it as a "Problem" one.

   -2, Both USRPs can transmitting and receiving for a short time(around 2mins), and then one USRP(the same "problem" one as mentioned in result 1) failed to receive while the other one was still transmitting. The failed one could not get recovered, even though I attempted to power cycled it or stop receiving and restart again without power cycling.
         There's a similar case that if I stoped receiving of the "problem" USRP and restart receiving again without power cycling . The "problem" USRP could receive for the first two or three times, but after I attamped to restart receving for the fourth time(for example). The "Problem" USRP can not receive packges.

   -3, Yesterday morning before lunch time,both USRPs can miraculously transmitting and receiving for a relatively long time(around 10-15mins) without any part of them failed (transmitting and receiving in both direction). While after coming back from lunch, however, the problem came out again exactly same as the first one above. (i.e. transmitting and receiving only in one direction).

Example 2) non-OFDM example (under ../gnuradio-examples/digital/benchmark_tx&rx)
   -1, Yesterday, there's no problems if I kept on transmitting from one to the other without switching the tx&rx parts. If I stoped receiving and restarted to receive without power cycling, the receiver would keep on receiving.

   -2, The problem will come out after I switched the TX and RX role of USRPs. I had to power cycle the USRP which is going to receive, otherwise, it will not work. (Actually, both USRPs exhibit problems depending on which one is the receiver and this USRP has to be power cycled in order to receive packge correctly)

Above are my test results. I was wondering if it might be concluded as the hardware problems. If you have any comments or ideas, please let me know. Thanks in advance!



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