Yes, there are some forms of QRM that will confuse a busy frequency
detector. When that's the case, the frequency is often not usable
anyway, so the "false positive" is actually helpful. And when the
situation is uncertain, good amateur practice would lead one to QSY
than risk QRMing an ongoing QSO.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, "mulveyraa2" <[EMAIL PROTECTED]> wrote:
>
> --- In digitalradio@yahoogroups.com, Bill Turner <dezrat@> wrote:
> >
> > ORIGINAL MESSAGE:
> >
> > At 08:57 AM 6/22/2006, mulveyraa2 wrote:
> >
> > >The software would need to be able to determine whether any of
> > >*dozens* of possible signals are present in the passband. In
the case
> > >of some of the more exotic ( and even less exotic modes ), it
needs to
> > >try to decode multiple bandwidths and bitrates. This takes
quite a
> > >bit of time.
> >
> > *********** REPLY SEPARATOR ***********
> >
> > The software doesn't need to "decode" anything. The presence of
a
> > coherent signal means the frequency is busy. In this context,
> > "coherent" means any non-white noise, repeating signal,
including
> > those that change frequencies within the channel.
> >
> > Coherent signal detected = no transmit.
> >
> > No jailhouse lawyers, please. We all know what the above means
in the
> > real world.
> >
>
>
> So your "busy detector" would not allow transmissions on the HF
> bands in the presence of static crashes, localized QRM from dimmers
> switches, motors, electric fence chargers, faulty power line
> insulators... does that seem like an effective solution to you?
> Becuase, in my real world, all of those things are present at one
time
> or another.
>
> - Rich
>
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