Something I’ve noticed over the years with the USRP is that it seems
unusually sensitive to power glitches, even tiny ones. Maybe
For example, removing an RF connector while the USRP is powered up can
sometimes cause it to go into “Protocol Error -71” in and
endless loop, and other things that might introduce small amounts of
This morning, my wife started the vacuum cleaner outside my office. The
USRP had been running entirely fine for 24 hours, and
then as soon as the vacuum cleaner started (causing a small AC
glitch), the USRP crashed with “Protocol Error -71”.
Is this an USRP thing, or is it that the USB is rather noise sensitive,
and you normally don’t see it because 99% of USB devices
are powered from the PC, rather than independently, as the USRP is.
Have other people seen this effect? I know at least one other person
who sees “sensitive USRP” issues, and I wonder if it’s
Principal Investigator, Shirleys Bay Radio Astronomy Consortium