[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss-gnuradio] Sensitivity of USRP to power glitches

From: Marcus D. Leech
Subject: [Discuss-gnuradio] Sensitivity of USRP to power glitches
Date: Sat, 11 Apr 2009 11:16:04 -0400
User-agent: Thunderbird (X11/20090105)

Something I've noticed over the years with the USRP is that it seems
unusually sensitive to power glitches, even tiny ones. Maybe
  ground noise?

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
ground noise.

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

Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium

reply via email to

[Prev in Thread] Current Thread [Next in Thread]