Direct sampling mode frequency range?

Adam Nielsen a.nielsen at shikadi.net
Wed Jan 29 12:12:03 UTC 2014


> 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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