Broken WBX?

GNU Radio
1

Hi Guys,
I have recently received a WBX and am struggling to get it to work.

Please see the following screenshots:

http://www.flickr.com/photos/47218579@N06/sets/72157623341034652 shows a
very strong GSM base station at 940.2MHz. As you can see, the DBSRX
works
perfectly but the WBX (using the same antenna) receives nothing.

http://www.flickr.com/photos/47218579@N06/sets/72157623341037644 shows
my
WBX receiving nothing over 930-960Mhz using the same antenna as the
DBSRX.
The spikes seen on the WBX are drifting signals which don’t go away.

The 88-108MHz FM broadcast band cannot be received by the WBX either,
although my TVRX receives it fine. Changing the gain, frequency and
antenna
port doesn’t do anything apart from alter background RF levels.

I have compiled from the latest trunk using the git repository, running
ubuntu 9.04 32 bit.

Here are the commands I have been using:

DBSRX: ./usrp_fft.py -R B -f 940.2M -d 64 -g 35
WBX (TX/RX antenna): ./usrp_fft.py -R A -f 940.2M -d 64 -g 35 -A TX/RX
WBX (RX antenna): ./usrp_fft.py -R A -f 940.2M -d 64 -g 35 -A RX

Have I received a broken WBX or am I missing something obvious?

Thanks,

Mike
M0MIK

2

Mike,

Doe your USRP have a serial number below 500? I know you’ve been a
longtime user, so yours may be that old. If so, the WBX won’t work for
you since USRPs under #500 do not send a clock to the daughterboard, and
the WBX needs one.

Also, note that in the following command:

WBX (RX antenna): ./usrp_fft.py -R A -f 940.2M -d 64 -g 35 -A RX

it should read “-A RX2” on the end.

Matt

3

Hi Matt,

Thanks for your reply.

My USRP1 serial number is 134 :frowning:

“-A RX2” was used, I clearly can’t copy and paste correctly!

Is there a clock you could recommend that will fit inside the USRP1
enclosure to fix this issue?

Fingers crossed!

Cheers,

Mike
M0MIK

4

Hello Matt

Matt E. wrote:

Mike,

Doe your USRP have a serial number below 500? I know you’ve been a
longtime user, so yours may be that old. If so, the WBX won’t work
for you since USRPs under #500 do not send a clock to the
daughterboard, and the WBX needs one.

I seem to have the same problem (USRP Ser #371 + WBX). Is there any
solution to this (can we add the connection from clock to dboard
ourselves)?

Regards, Andreas