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Re: [Discuss-gnuradio] DBSRX: Tune the LO from python

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] DBSRX: Tune the LO from python
Date: Fri, 16 Mar 2007 13:35:40 -0700
User-agent: Mutt/1.5.9i

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.

> 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

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.


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