{basic,lf}rx

GNU Radio
1

Hi Matt,

I was wondering why the BasicRX and LFRX daughterboards seem to have 3
instead of 2 subdevices? This seems to be coming from
usrp/host/lib/db_boards.cc

Thank you

Dimitrios S.
“If you think you’re too small to make a difference, try sleeping with
a mosquito!” - Amnesty International

2

Subdevice0 is the antenna A, Subdevice1 is the antenna B. You can use
both subdevice 0 and 1 at the same time on two different ddc inputs and
tune them separately. These subdevices are used as real inputs, and the
Q inputs to the ddc are set to zero.

The third possibility is to use subdevice2 which treats the antenna A
and B as a single complex input (I and Q), and connects them to the I
and Q inputs of the DDC input0. When using subdevice2, you cannot use
subdevice 0 and 1.

-Josh

3

Great, thanks. Added it to the wiki

Dimitrios S.
“If you think you’re too small to make a difference, try sleeping with
a mosquito!” - Amnesty International