On 6/5/07, FISCHER,GREG <[EMAIL PROTECTED]> 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: ???
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