RE: [Discuss-gnuradio] USRP and gnuradio errors - seems to disconnectoften

[Casey Tucker]

I acquired another USRP with the same configuration yesterday and tested it,
and I had the exact same results with it as I did with the first one. I also moved
the power supply to an isolate circuit, and it had no effect. I do have powered
speakers in my room, but I don't understand how they would have any effect
on the stability of my USB device. I use other USB and FireWire devices in my
computer with a good amount of reliability on all of them. I've also tried
disconnecting these devices as well; nothing changes. BTW, I'm using
gnuradio-3.0.2 on windows, and 3.1.1 on linux.

> From: address@hidden
> To: address@hidden
>
> Casey Tucker wrote:
>
> > I've been doing some testing with a new USRP (manufactured 12/2007). My
> > configuration is an Intel USB interface on a P965-S motherboard. I
> > dual-boot XP
> > SP2 and Arch Linux. In XP I've used Cygwin and MinGW. I've tried removing
> > all
> > but the TVRX board (which is mainly what I'm attempting to test), and my
> > problems persist. I've also switched to another USB cable just to be sure.
> >
> > What seems to be happening, is at random intervals while running the test
> > scripts
> > (mainly usrp_wfm_rcv.py and usrp_tv_rcv), the GUI hangs, and when I exit
> > the
> > GUI, I get messages as follow:
> >
> > uOuOuOuOuOuOread: usb_reap_async: usb_reap_async: error: A device
> > attached to the system is not functioning.
>
> I am familiar with this message. In my case, it occurs often (with Cygwin
> or MinGW) when I turn on (or sometimes off) any of several devices (desk
> lamp, power supply, amplified speakers) in my computer room. Using a
> constant-voltage isolation transformer on either the USRP or desk lamp makes
> no difference. The desk lamp, USRP, and computer are plugged into separate
> surge suppressors or outlet boxes. Devices elsewhere in the house have no
> effect.
>
> My guess is that it is a hardware problem, but not necessarily in the USRP
> hardware. It would be interesting to see if other USB 2.0 devices that run
> continuosly at high data rates see similar disruptions, but I don't have any
> other such devices to test.
>
> -- Don W.
>

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