[Elecraft] Feature request K4 ATU - nearest band tuning

[Andrew Moore]

I wonder if the K4 & tuner could a good enough approximation based on RX
signal level or even background noise level.

When I've done this manually, for both outside and within the ham bands,
using the L & C on my external tuner, I can hear the difference and know
generally where a good match is found.

Surely the K4 could do better than my ears. Seems like this would be
possible without even transmitting. Could be a great feature.

73
Andrew NV1B
..


On Mon, Apr 11, 2022 at 9:50 AM Magnus Danielson via Elecraft <
elecraft at mailman.qth.net> wrote:

> Hi,
>
> So, beyond the fun of doing QSOs, I also listen to intermediary bands.
> Sometimes however it is clear that it would be good to have the ATU tune
> up. So the manual procedure I do is to go to nearest band, tune there,
> and go back. This way I will not transmitt out of band, and the tuning
> is not really perfect for my listening, but I have noticed that
> listening condition becomes better so this approximation kind of works.
> Now, it would be great if just hitting the ATU TUNE would do this for me
> in the background, so hence a feature request.
>
> Technically, one wants to use the mid point f2 = sqrt(f1*f3) where f1 is
> the upper side of lower band and f3 is the lower side of the upper band
> from the frequency fVFO. If fVFO < f2, then tune on the upper side of
> lower band, else tune on the lower side of upper band.
>
> The radio will need to know the legal borders of the bands for the
> country to do this. Also, you most likely want to have a configuration
> variable to enable/disable this feature. When disabled, todays behaviour
> of refusing tuning can be used.
>
> Cheers,
> Magnus
>
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