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Re: [Discuss-gnuradio] Failed to tune to low frequency with usrp.tune

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Failed to tune to low frequency with usrp.tune
Date: Wed, 22 Aug 2007 14:09:04 -0700
User-agent: Mutt/1.5.9i

On Wed, Aug 22, 2007 at 01:46:06PM -0700, Matt Ettus wrote:
> Bahn William L Civ USAFA/DFCS wrote:
> >   
> >> That is because the onboard VCO typically won't tune below 2.3 GHz.  You
> >> can change line 456 in gr-usrp/src/db_flexrf.py to allow you to try
> >> going lower.
> >>
> >> Matt
> >>     
> >
> > Is there someplace where the (nominal) tunable ranges of each of the 
> > daughterboards is available?
> >
> >   
> In that same file

Given an instance of the daughterboard in question, you can ask it:




for the valid gain ranges

>From the abstract daughterboard base class db_base.py:

    def freq_range(self):
        Return range of frequencies in Hz that can be tuned by this d'board.

        @returns (min_freq, max_freq, step_size)
        @rtype tuple
        raise NotImplementedError

    def gain_range(self):
        Return range of gain that can be set by this d'board.

        @returns (min_gain, max_gain, step_size)
        Where gains are expressed in decibels (your mileage may vary)
        raise NotImplementedError


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