[Elecraft] RTTY filter for K3

[David Woolley]

Alan Bloom wrote:

> It might be possible to use separate Nyquist filters and detectors for
> the two tones, treating each one as if it were a separate on/off-keyed
> signal.  If the transmitted signal is not filtered too heavily (i.e.
> jumps quickly from one tone to the other) it seems like that should
> work.

My impression was that that was the expected way of handling RTTY signals.

Transmitter circuits from 1968 simply switched between two oscillators 
to key the signal; they didn't try to make a smooth transition in the 
frequency domain.


-- 
David Woolley
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