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Re: [Discuss-gnuradio] Problem with USRP2 continuous transmission at >10
Re: [Discuss-gnuradio] Problem with USRP2 continuous transmission at >10MHz
Fri, 09 Oct 2009 13:40:26 -0700
Thunderbird 220.127.116.11 (X11/20090825)
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
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"?