[Elecraft] [KXPA100] ATU

[Don Wilhelm]

Joel,

If you have the KXAT100 in your KXPA100 then, you should set the KXAT100 
to AUTO while you "train" the ATU.  Move the VFO in 50kHz increments and 
do a TUNE.  Do that for all bands of interest and each antenna of interest.

Then put the KXATU into MAN mode and it will recall the settings for 
each band segment, but will not try to auto-tune.

If you leave it in AUTO mode, it may detect an erroneous bad SWR and 
attempt to auto-tune.  That is more likely during SSB speech than it is 
for CW or data modes.

If you have resonant antennas and do not wish the KXAT100 to tune, put 
it in bypass for those antennas.

In other words, do not leave the KXAT100 in AUTO mode unless you connect 
an antenna that you have not yet trained the antenna to.

73,
Don W3FPR

On 7/20/2016 8:34 PM, Joel Black wrote:
> I am not completely understanding the tuning performed using the KX3 with the KXPA100.
>
> First, I’m not even completely sure which mode I should be in: Byp, Man, or Auto. I have three antennas - one is a vertical which is resonant on 40 - 10 except for 17 and 12 m. I have an OCF that is resonant on 40 - 10 *including* 17 and 12 m. I also have a shortened 80 m inverted vee that I have to tune if I go to 75 m.
>
> Currently, I have the shortened 80 m antenna selected with my antenna switch. No matter which mode I use, I never hear any relays in the KXPA100 ATU and I never get below about 7.4:1 SWR. The KX3’s ATU works just fine with the same antenna. Pressing the ATU TUNE button on the KX3 starts the 25 LED blinking but stopping the tuning does not stop the 25 LED from blinking. It’s blinking right now and I’m not tuning anything.
>
> I’m going to go back and verify all my cabling (I also have a PX3 in the mix) and make sure I haven’t cabled something wrong. Otherwise, what else can I look for?
>
> Thanks,
> Joel - W4JBB
>
>
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