Two points:
1. An effective busy detector was released with SCAMP more than a
year ago
2. the ARRL proposal (RM 11-306) eliminates the subband restrictions
on semi-automatic operation.
73,
Dave, AA6YQ
--- In [email protected], "mulveyraa2" <[EMAIL PROTECTED]> wrote:
>
> --- In [email protected], "Dave Bernstein" <aa6yq@>
wrote:
> >
> > Your software has access to the entire transceiver pass band --
it
> > can hear what you would QRM if you transmitted. If there is no
> > signal within the transceiver pass band, then the range of
> > frequencies on which you will transmit is clear, and you can
> > transmit with confidence that you aren't QRMing an ongoing QSO.
> >
> >
>
> You're missing the point entirely.
>
> Start out with this: Define "signal." You must define it so
that
> it can be *unambiguously* differentiated from atmospheric noise,
> geomagnetic noise, static crashes, etc. You must also define it so
> that it encompasses all modes - past, present, and future - without
> requiring that thousands of stations constantly update themselves
when
> a new mode comes out.
>
> Can you do that? Some of the best software and hardware
engineers
> out there have been trying for years, without notable success. Do
you
> have some secret method that you just haven't gotten around to
publishing?
>
> I don't intend to be snarky, but when someone says "Just look
for a
> signal", they obviously haven't the slightest idea about how
difficult
> it actually is. Commercial and military systems get around the
issue
> by using strict channelization and mode requirements - something
we in
> the Amateur service won't do.
>
> So, in the meantime, we're stuck with stations in the automatic
> sub-bands, which is the best solution so far. Yes, yes, I know,
some
> people will start crying out about how "I can operate anywhere I
> please", and "Nobody owns a frequency!" But guess what? The
amount
> of bandwidth they take up is very small, and it is very, very easy
to
> avoid them. And until someone comes up with that fabled universal
> signal detector, that's the best compromise we have.
>
> - Rich
>
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