> "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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
