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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There's a uhd "helper function" that gets imported to allow you to do this:
Where the UHD block takes frequency, you can replace it with:
uhd.tune_request (target_freq, lo_ffset)
The RF upconversion happens after the DSP on the TX side. It may be
beneficial to move the LO on the TX side as well.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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