[Discuss-gnuradio] Setting the DSP frequency in the UHD blocks

[Wallace, Frank L CIV NSWCDD, Q41]

In gnu radio companion for a UHD block, how do I set the DSP frequency as well 
as the RF frequency.  I have done this in my C code which doesn't use gnuradio 
using the tune_request_t structure.  From the comments in the python code, it 
appears that there is some way to do it.

I understand that I want to use the DSP LO so that the DC component from the 
ADC is moved outside the baseband.  Is there a good value or is  anything 
outside my receive bandwidth is ok?

Is there a reason to use the DSP LO on the transmit side? Does the up 
conversion happen before or after the DSP LO?

Thanks,
Frank Wallace

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