Understanding MUX registers

GNU Radio
1

Hi all.

I’m working on using GNU radio to receive and process GSM signals. In
looking at the usrp_rx_cfile.py program, it appears that the DDC’s MUX
value
is set automatically by probing the USRP. In our case it sets the MUX
value
to 0x1. We think that means that the ADC1 input is wired to the signal
I
value on DDC0 and the ADC0 is wired to the signal Q value on DDC0. Is
this
correct?

Thanks,

Sarah

LT Sarah Boutwell, USN

NPS Student, Computer Science

NIPR: mailto:[email protected] [email protected]

2

On Fri, Oct 29, 2010 at 10:22:27AM -0700, Sarah Boutwell wrote:

Hi all.

I’m working on using GNU radio to receive and process GSM signals. In
looking at the usrp_rx_cfile.py program, it appears that the DDC’s MUX value
is set automatically by probing the USRP. In our case it sets the MUX value
to 0x1. We think that means that the ADC1 input is wired to the signal I
value on DDC0 and the ADC0 is wired to the signal Q value on DDC0. Is this
correct?

Yes, it is.