[Elecraft] K3 and Datamodes

[Julian G4ILO]

On 6/5/07, FISCHER,GREG <ab7r at cablespeed.com> wrote:

> I believe the only time you will need some other external
> interface would be for true FSK.  The line for this is on
> the ACC connector and should be keyed via an open
> collector at less than 5 volts.

Why would one want to use true FSK if you are using for receive a
modern datamode program that is capable of AFSK anyway? With AFSK you
can net on a station by clicking on the waterfall. With FSK you have
to tune the radio to the exact frequency.

I know FSK keying was useful in the days before PCs had sound cards.
Actually, I can probably claim to have written the first PC RTTY AFSK
software, 20 years ago for MS-DOS. It's not something I normally shout
about, though. It used the PC's internal speaker to generate the
audio. Knowing more about computers than I did about radio, I didn't
realise that the audio was rich in harmonics and I was transmitting 3
or 4 copies of my signal. Well, they say the best lessons are the ones
you learn the hard way. :)
-- 
Julian, G4ILO
G4ILO's Shack: www.g4ilo.com
K2 s/n: 392  K3 s/n: ???