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

[Matt Ettus]

Roshan Baliga wrote:
> Hello everyone,
>
> We've run into a problem with the "B" input on the Basic RX board with
> a USRP. Specifically, a test tone running into the "A" input shows up
> fine 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 in 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

use -R A:1 for the "B" input.  It defaults to real-input mode, which
treats the 2 SMA inputs as separate signals.

using -R A is the same as -R A:0

Matt