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Re: [Discuss-gnuradio] WBX - only real signal after some time

From: Ruben Undheim
Subject: Re: [Discuss-gnuradio] WBX - only real signal after some time
Date: Thu, 20 Jan 2011 20:51:58 +0100


I am using the traditional driver. Maybe I can try to use another computer or to put the board in the other slot,
and see if the problem remains the same.


2011/1/20 Marcus D. Leech <address@hidden>
On 01/20/2011 11:40 AM, Ruben Undheim wrote:
> Hello.
> I just wondered if anyone else has experienced that the WBX stops
> sending the quadrature component of the complex signal after a while.
> This happens especially if I have sliders for setting the frequencies
> or the gain, and the sliders are slided. (so that a frequency change
> control signal is sent several times successively)
> In an FFT-sink, this is observed as a display mirrored around the base
> frequency.
> I have not found any other solution to fix this than to restart the
> whole program every time it happens. This has never happened when
> using the TVRX board.
The TVRX isn't actually a quadrature front-end, so quadrature is
synthesized within the FPGA.

> I wonder if this is normal for these daughterboards, and that one just
> has to ensure that they do not get a lot of frequency setting control
> messages successively, or if there is a workaround.
I don't think it's normal.  Something definitely wonky.   Are you using
UHD, or "traditional" ??

There was something *similar* in UHD a couple of months back, but it was
for USRP2, so I don't
 think that's it.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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