Re: [Discuss-gnuradio] VHF Transmitter

[Ed Criscuolo]

Dimitris Symeonidis wrote:
> What about BasicTX, which does 1-250MHz?


The 250 MHz spec on the BasicTX is somewhat misleading.
Although the analog portion (basically the transformer)
is rated to that, the D/A converter is only running at
128 Megasamples/sec. Nyquist says I can only use that
to synthesize up to a 64 MHz signal.  Beyond that, I would
have to under-sample and use one of the aliases.  Essentially,
to get 145 MHz, I would have to run at a lower frequency
and try to use one of the upper aliases and a high-pass
filter to get 145 MHz.

Is this practical?  Is there enough energy there to have
a decent S/N ratio after filtering?

@(^.^)@  Ed