Re: [Discuss-gnuradio] Re: usrp wfm problem

[Marcus Leech]

It would be useful to have a function that returned the as-aliased 
frequency for
 any given input frequency (up to the maximum input frequency of the A/D).
 Trivial, I suppose, but less opportunity for brain farts that way.


Matt Ettus wrote:

> Quoting mj <address@hidden>:
>
>  
>
> > > Am i missing something obvious?
> > >
> > >      
> > Fixed it. the "freq1 = blah * 1e6" evaded me.
> >
> > Still not sure on how to receive 433Mhz if anyone
> > knows.
> >    
>
>
> As RF frequency rises from 0 to 32 MHz, the "digital" frequency goes from 0 to
> 32 MHz.  As RF frequency goes from 32 to 64, digital frequency goes back down
> to 0.  It the repeats from there.
>
> So you can receive 433.0 MHz at:
>
> 433 - (6*64) = 49 MHz.
>
> 433 appears where 49 would
>
> 49-32 = 17.
>
> 32 - 17 = 15 MHz
>
> So tune to 15 MHz to hear 433.
>
> This will all be much easier once there are proper RF sections available.
>
> Matt
>
>
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