Forum: GNU Radio DBSRX: Tune the LO from python

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815d7689c14621a2a5ed60b8bcde29b8?d=identicon&s=25 Chris Stankevitz (Guest)
on 2007-03-16 09:18
(Received via mailing list)
Is it possible to set the DBSRX's LO frequency and the FPGA DDC
independently?  Currently you can set the single quantity (LO - DCC)
using the USRP's "tune" member function.

When f = 1.57542GHz, I do not like GNURadio's choice of
LO = 1.5755 GHz
DDC = 80KHz

The board seems to put out a signal at 1.5760 GHz when the LO is tuned
to 1.5755 GHz which is not present when the LO is tuned to slightly
higher freqs.  I would like to tune the LO to the higher freq and use a
larger DDC.

Thanks,

Chris
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2007-03-16 21:31
(Received via mailing list)
On Fri, Mar 16, 2007 at 01:17:27AM -0700, Chris Stankevitz wrote:
> Is it possible to set the DBSRX's LO frequency and the FPGA DDC
> independently?

Yes it is.

> larger DDC.
>
> Thanks,
> Chris

You have all the source available to you.

The source to "tune" is in gr-usrp/src/usrp.py
gr-usrp/src/db_dbs_rx.py may also be relevant.

Eric
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