Re: [Discuss-gnuradio] switching between signal and reference source

[Marcus D. Leech]

>
> On Thu, Apr 15, 2010 at 16:52, Marcus D. Leech <address@hidden> wrote:
>
>   
> If you are willing to give up an LSB, you can turn on GPIO streaming
> with enable_gpio_streaming().  Then io_rx[15] will show up in the lsb
> of I, and io_rx[14] will show up in the lsb of Q.  You need to use the
> usrp2.source_16sc source to get the raw samples, then gr_and_const to
> separate the digital bit from the rest of the sample.
>
> The io bits get stuffed as the samples come out of the DDC, so there
> is a fixed offset (you'll need to measure it) based on the group delay
> through the whole analog front-end and FPGA DDC.  The delay is
> decimation dependent, but deterministic.
>
> Johnathan
>
>
>   
OK, so Josh, how do you get access to usrp2.source_16sc from GRC?



-- 
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org