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RE: [Discuss-gnuradio] B input on BasicRX not working

From: Bahn William L Civ USAFA/DFCS
Subject: RE: [Discuss-gnuradio] B input on BasicRX not working
Date: Fri, 26 Jan 2007 18:42:46 -0700

If I understand you correctly, you are trying to receive a signal sent
in to the "RX-B" input of a BasicRX board, as opposed to the "RXB" slot
of the USRP (gotta love the completely clear and unambiguous labeling). 

If that is the case, then to get input from the B side you need to use
A:1 as the source (if the BasicRX is plugged in to RXA) and B:1 if it is
plugged in to RXB.

Where, might you ask, is this and other things like it documented? As
near as I can tell, it isn't. On about the third time that I asked the
same question someone on this board finally let me in on the secret.

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On
> Behalf Of Roshan Baliga
> Sent: Friday, January 26, 2007 6:09 PM
> To: address@hidden
> Subject: [Discuss-gnuradio] B input on BasicRX not working
> Hello everyone,
> We've run into a problem with the "B" input on the Basic RX board with
> USRP. Specifically, a test tone running into the "A" input shows up
> in the fft application, as well as in a captured file. However, a test
> tone running into the "B" input doesn't have any power in the FFT or
> the captured file. Digital sample values on the 'bad' input are all
> either 0,1, or 2.
> We've tried tones at 250 MHz and 1 MHz, and we've tried two basicRX
> boards as well as 2 USRPs. We've also looked at the BasicRX boards to
> verify that the input signal actually makes it to the high density
> connector.
> Any thoughts?
> To capture I'm using:
> ./usrp_rx_cfile.py -R A -d 8 -f 0 -s -N 1000000 filename.dat
> (Of course, that's the example when the BasicRX is in the A slot.)
> -Roshan
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> Discuss-gnuradio mailing list
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