Direct sampling mode frequency range?

Richard Koch n1gp at hotmail.com
Wed Jan 29 12:25:38 UTC 2014


Ah yes, that makes sense now.  Tnx everyone.


> Date: Wed, 29 Jan 2014 22:12:03 +1000
> From: a.nielsen at shikadi.net
> To: osmocom-sdr at lists.osmocom.org
> Subject: Re: Direct sampling mode frequency range?
> 
> > Can someone clarify what the frequency range is in Direct sampling
> > mode.
> 
> In direct sampling mode you can "tune" by setting the IF between 0 and
> 30MHz.
> 
> > So can the dongle in "direct sampling mode" (with appropriate antenna
> > connection) receive > 14.4 Mhz (Nyquist) ?
> 
> Yes, and it has nothing to do with Nyquist because the sample rate you
> receive is only 2MHz or so as per normal.  Direct sampling mode does not
> capture a wider band than normal, it just uses a different method to
> tune the receiver.  So the oscillator frequency is irrelevant, and
> Nyquist doesn't come into it any differently with direct sampling than
> with normal sampling.
> 
> Cheers,
> Adam.
> 
 		 	   		  
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