29 Jan
2014
29 Jan
'14
12:27 p.m.
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.
Mmm, AFAIK, the rtl ADC work at 28.8 MHz and then the IF tuning is
done by an internal digital DDC (which will also decimate down to 2MHz
or so to ship via usb).
Cheers,
Sylvain