[RTTY] keyed AFSK? - was: Best RTTY rig?

[WA9ALS - John]

> What is keyed AFSK in contrast to AFSK and FSK? Never heard the term.
>
> 73,
> Ekki, DF4OR

Ekki, you're hitting your DELETE key too fast!  This was explained lots and
lots yesterday!  ;-)

FSK - Digital signal shifts main oscillator of rig.
AFSK - Usually external tones generated e.g. by an external TNC like pK232
feeds audio chain of rig, e.g. the mic input.
Keyed AFSK - Digital signal to "FSK INPUT" of rig keys internal AFSK
generator inside the rig to produce tones.  (Think of it sorta like having a
PK232 inside the rig.)

FSK doesn't depend on user having proper audio levels set on
rig/soundcard/TNC.  Even the "FSK" input (really keyed AFSK) on the Yaesu
rigs is subject to the mic gain control.