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Re: [Discuss-gnuradio] Problem with USRP2 continuous transmission at >10

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Problem with USRP2 continuous transmission at >10MHz
Date: Fri, 09 Oct 2009 13:40:26 -0700
User-agent: Thunderbird (X11/20090825)

hanwen wrote:

We use tx_samples.cc to transmit a file with 16bit-short complex samples at 10MHz and 20MHz. We use another USRP2 to receive the signal and store on disk. We observed there are some unexpected gaps in the received samples. Using usrp2_fft.py with the osiliscope view, we also observed such kind of gaps. We guess this might be caused by underrun at the transmitter side. We use the delievered ethernet cable, so this shouldn't be the problem of bad cable. Anyway, how can we transmit samples contineously and stably without underrun at 20MSamples/s??

1 -- Make sure you have realtime scheduling enabled
2 -- Use a very fast computer

are you sure you are seeing underruns? Have you connected to the debug serial port on the USRP2 and seen it send "U"?


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