Sometimes you’ll have two antennas available for your KX2 or KX3, for example different whips (my situation the other day) or a whip and a wire, etc. In both cases you might be using the internal ATU.
Q: Do you need to retune the ATU each time you swap antennas?
A: No. Both rigs have a menu entry added last year called “ATU DATA” (SET 1 and SET 2). If you select SET 1 for one antenna and SET 2 for the other, tuning up the ATU on each separately, you’ll then be able to recall the appropriate ATU settings using this menu entry. This can be done very quickly using the programmable switch feature. On the KX3, assign MENU:ATU DATA to either PF1 or PF2. On the KX2, there’s only one PFn switch but this gives you access to four programmable functions.
Further information on ATU DATA sets, from the firmware release notes:
* TWO ATU DATA SETS: The KX2/KX3 will now store two full sets of per-band data for the internal ATU (KXAT2 or KXAT3). Use the ATU DATA menu entry to select which set to use. Typically SET 1 is used at a home location, and SET 2 for field operation. They can also be used in cases where more than one antenna is available for a given band. (Note: The ATU DATA menu entry has no effect on KXAT100 ATU data, which is already stored separately for each of the KXPA100 amplifier’s antenna jacks. The KX2/KX3 can remotely switch KXPA100 antennas using the radio’s ANT.X SW menu entry.)
If you need to A/B test antennas often during operation, you’ll need an external manual switch of some kind. Flip the switch, then swap the ATU DATA set at the rig.
73,
Wayne
N6KR
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