WBX - only real signal after some time

GNU Radio
1

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.

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.

Ruben
(using USRP1)

2

On 01/20/2011 11:40 AM, Ruben U. wrote:

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

3

Thanks

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.

Ruben

2011/1/20 Marcus D. Leech [email protected]

4

It’s working wonderfully now after I moved it to side B. More
investigation
is needed to find the problem…
But for the moment I’ll just enjoy the working set-up!

(btw: the loss of the complex signal is apparently not the only problem
when
it’s in slot A. It is also unstable and hangs after a while… However,
when
it’s in slot B, everything’s fine)

Ruben

2011/1/20 Ruben U. [email protected]