Yes. This was well-demonstrated in SCAMP, a soundcard-base protocol
that was beta-tested but never operationally deployed. For protocols
like Pactor-2 and Pactor-3 whose implementation evidently requires
an outboard modem, busy detection could be implemented either with
additional hardware, with modifications to the embedded software, or
both.
Steve K4CJX has said that some SCS modems provide busy frequency
detection, but I don't know what models provide this function, or
what sorts of signals can be detected. I do know that no automatic
station control software currently uses busy frequency detection to
refrain from transmitting when the frequency is in use.
73,
Dave, AA6YQ
--- In [email protected], Bill Turner <[EMAIL PROTECTED]> wrote:
>
> ORIGINAL MESSAGE:
>
> At 07:30 AM 6/21/2006, Dave Bernstein wrote:
>
> >the automatic station control software
> >immediately responds to an incoming request whether the frequency
is
> >locally clear or not.
>
> *********** REPLY SEPARATOR ***********
>
> Couldn't this be cured by software? The automatic station should
only
> respond to an incoming request if the channel is free of other
signals.
>
> Bill, W6WRT
>
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