http://elecraft.85.s1.nabble.com/Scanning-and-channel-hopping-question-tp7595522p7595549.html
thoughts on Wayne's explanation: IMPRESSIVE. Makes me want to buy another
K rig. The openness of explanation and willingness to hear the thoughts of
legendary. Hope that this company stays around forever so my grandson can
> > "Scanning while muted (normal scanning mode)
> > allows the K3 to ignore stable carriers, unmuting
> > only when "interesting" signals are found."
>
> If the signal appears to be an unmodulated carrier, i.e. with little
> amplitude variation over a period of about 1 second, then it is skipped.
> Noise can fool the algorithm sometimes, of course.
>
> There's actually a variable in the source code called "scanWorthy" that
> accrues intel about the signal :)
>
>
> > ...from the K3 manual - which appears to be a close DSP cousin to the
> KX3,
> > and I've also found some scattered bits about the KX3 that refers to
> > stopping when a "modulated signal" is found. So, what exactly triggers a
> > stop scan?
>
> It stops on any signal with a certain S+N/N ratio, then evaluates it as
> described above.
>
>
> > Is the scan signal detection
> > done after signal processing like noise blanking, noise reduction, notch,
> > etc? That would make it REALLY good at scanning HF !
>
> Yes and yes. It's really useful for discovering signals on a "dead" band
> (they seldom are truly dead, you will discover).
>
>
> > After scan stops on a signal, does it pause until the signal stops, or
> does
> > it continue after some fixed time?
>
> The latter. If the signal is "interesting" it will unmute the receiver and
> pause a lot longer.
>
>
> > I see that in VFO scan you can make it
> > effectively slow or fast by changing the increment step - , but in
> channel
> > hop, the "increment" is one hop - just not clear on the hops per second.
>
> I believe it's two hops per second if you use "live scan" (continuous, and
> unmuted) and 5 hops per second with regular scanning/hopping (muted).
>
>
> > And finally....how does the scanning stop/resume sequence work?
> > When a signal is detected, the scanning pauses for some interval, then
> > resumes when the signal stops? Or after a time interval if the signal is
> > still there it continues scanning until it hits the active channel again?
>
> All of the above. It's not using AI or anything -- just simple rules --
> and it will produce consistent results most of the time.
>
>
> > I've used (channel) scanning on HF quite a bit. Very useful
> > now that VFOs are rock solid and tune in milliseconds.
>
> As the guy who wrote the firmware, I'm happy to find that someone else
> finds it useful, *and* is curious about how it works. Thanks.
>
> The K2 has the same scanning feature, by the way.
>
> Wayne
> N6KR
>
>
>
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