[Elecraft] Re: KX1 PSK31? [how about FSK?]

[Lyle Johnson]

David Kearns wrote:
> I would find the idea of a small RTTY rig an excellent
> idea.  Obviously PSK is a no go because its an audio
> signal from a computer hence needing SSB. 

Actually, the only requirement is that the RF amplifier be biased to be 
linear.  PSK31 can easily be generated at RF by applying a shaped 
baseband signal to a balanced modulator which is then used to get the 
required phase reversals.

It is normally done using SSB audio, but this is not a requirement.  A 
KX1 would need more than a firmware change to do this, however.

In fact, at these power levels, the balanced modulator could conceivably 
be *between* the RF output and the antenna tuner!  Doubt that this is 
practical, though...

Lyle KK7P