http://elecraft.85.s1.nabble.com/KPA-1500-ATU-operation-tp7656949p7656961.html
> I understand that the ATU uses 10 kHz segments on 80, which was at
> some point changed from 20 kHz. That means the center points are 3505,
> 3515, etc. There is some hysteresis when tuning, but I'm not sure that
> consistently explains where it switches. It also won't switch until
> you stop tuning for 1/2 second, or so.
>
> Another factor is that the ATU only measure frequency to, I think, 8
> kHz. The net result may be that sometimes it's not in the frequency
> segment you think it should be in. Unless you have a very narrow band
> antenna, it shouldn't make much difference.
>
> 73,
> Scott K9MA
>
>
>
> On 12/10/2019 17:03,
[hidden email] wrote:
>> After saving my KPA-1500 ATU impedance matching parameters on 80M at
>> 20 Kc intervals (3.510, 3.530, 3.550, 3.570, etc, etc), I expected
>> that the KPA-1500 ATU would automatically switch to the next set of
>> L/C values at the midpoint of the 20 Kc segments (like 3.520, 3.540,
>> 3.560, etc, etc), but I find that it switches randomly, sometimes
>> just 2 Kc away from the main tuning frequencies. Does anyone have
>> information on how the ATU is supposed to work when it is polling the
>> xcvr for frequency?
>>
>> Thanks, K5UA
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