[Elecraft] KX3 auto tuner solution available after tune?

[Wayne Burdick]

Michael Blake <k9jri at outlook.com> wrote:

> Does the KX3’s internal auto tuner have the ability to provide the tuned solution like the Elecraft T1 QRP tuner does? 

Hi Michael,

You can use the "AK;" command to get the KXAT3's relay states.

The response format is

   AKaabbcc;

where:

aa = inductance IO bitmap in ASCII hex
bb = capacitance bitmap in ASCII hex
cc = misc relays bitmap in ASCII hex

The <aa> and <bb> bitmaps can be equated to L and C values by looking at the KXAT3 schematic. For example, a value of "01" would represent the smallest L or C value in the network.
 
At present only bit 0 of byte cc is defined:

00 = capacitors on antenna side
01 = capacitors on antenna side

If the ATU is not installed, or is in one of the Lx/Cx test settings, “AK000000;” is returned.

In BYP mode, on some bands L and C are set to fixed non-zero values in order to cancel the ATU's own reactance when working into a 50-ohm load.

In AUTO mode, the working auto-tuned values are shown.

73,
Wayne
N6KR