--- In [email protected], "Dave Bernstein" <[EMAIL PROTECTED]> wrote:
>
> The simple rebuttal to this post is "its already been done". SCAMP
> demonstrated a highly-effective busy frequency detector running on a
> PC and soundcard more than a year ago.
>
>
OK, now you're verging into the ridiculous. Especially when you
claim something that the SCAMP developers themselves say is not
currently possible.
You're leaving out the part where is failed to work on anything
other than a limited set of modes, and required extremely high signal
strengths in order to function correctly.
I direct your attention to KN6KB's SCAMP paper from last year. In
particular, his statement:
--------------
2.10 Busy detector
The SCAMP protocol contains several mechanisms to help make it a
friendly neighbor in
the shared spectrum of amateur radio. One of these mechanisms is a
busy detector to
determine when a channel is free to use. Fail-safe busy detectors for
all modes of
operation and modulation schemes are currently beyond the state of the
art. However it is
possible with available DSP techniques to build reasonable detectors
for some modes and
these can significantly reduce possible QRM due to hidden transmitter
effects. In
semiautomatic operation (where a control operator initiates a
connection to a remote
automated station) the control operator must of course not rely on the
busy detector but
also listen to insure there is a free channel.
-------------------
Note: "Fail-safe busy detectors for all modes of operation and
modulation schemes are currently beyond the state of the art."
Note: "it is possible with available DSP techniques to build
reasonable detectors for some modes and
these can significantly reduce possible QRM due to hidden transmitter
effects"
I.E: It's extremely limited in actual utility, in case that isn't
crystal clear.
- Rich
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