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

[Juha Vierinen]

This is probably unrelated, but I once had random errors similar to
this when I used an under-rated power supply with USRP. Another
possibility is a loose power supply jack connector.  But I guess you
have pretty much ruled these out already.

juha

On Feb 17, 2008 7:56 AM, Casey Tucker <address@hidden> wrote:
>
>  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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