Julian G4ILO wrote:
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 must be missing something. I thought AFSK was an FSK signal produced
by feeding an audio tone which is switched between mark and space
frequencies to an SSB transmitter, resulting in a single RF carrier
whose frequency changes.
This signal, if the tones are clean sine waves and the transmitter has
good carrier and opposite sideband suppression, should be *identical* to
a 'true' FSK signal, which is produced by varying the frequency of a VFO
in the exciter.
If you mean that it's easier to tune an AFSK signal that has some
residual carrier, that's a poor signal.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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