[Elecraft] Per antenna ATU settings for KX3/KXPA100

[Dick Dievendorff]

There are separate ATU memories for ANT1 and ANT2 for each frequency
"segment" (normally 20 kHz except on 160, 10 and 6 meters).

If you clear the memories for ANT2 using the KXPA Utility, put the ATU in
bypass, select ANT2, tune your loop for low SWR at the middle of the band,
then put the KXPA100 into mode MAN. While transmitting, with low SWR because
you tuned the loop, press the ATU  TUNE button.  The KXPA100 will measure
the SWR and find that it's less than 1.2:1  and will store "bypassed" result
as the desired ATU tuning solution for ANT2 on that frequency.  You can
watch this with the KXPA Utility Operate page if you want to make sure that
it's "bypassed".

Repeat this on each band where you use the loop.

Thereafter, keep the ATU in mode MAN, and when you transmit on ANT2 on any
frequency, the ATU will look for a memory nearest the transmit frequency.
If there's only one mid-band tuner solution saved, that's the one it will
find. And because that antenna tuner setting is "bypassed", the ATU will
load the "bypassed" solution.

If the SWR becomes suddenly high because you didn't tune the loop, in mode
MAN, the ATU will not attempt to retune. It'll fault with a high SWR fault.
If the ATU is put in mode AUTO, it will attempt to retune based on a high
SWR.  In your situation, you'd want to stay in mode MAN.

73 de Dick, K6KR


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of David
Orman
Sent: Thursday, March 26, 2015 7:54 AM
To: Elecraft Reflector
Subject: [Elecraft] Per antenna ATU settings for KX3/KXPA100

Is it possible to bypass the ATU on one antenna but not the other? I have a
small transmitting loop on ANT1 and a horizontal wire loop on ANT2. The STL
has an ATU for tuning the loop physically, and thus I should not be using
the ATU on the KXPA100/KX3. I'd like to disable/bypass the ATU for this
antenna, but the ATU is necessary for the horizontal wire loop, so I would
like to have it enabled on the other antenna.

Currently I have to be careful when switching antennas not to short-press
the button as it will tune on the STL if I do, which is non-ideal. I also
have to clear all tuning every time I turn on my radio to make sure I
haven't fat-fingered and tuned up the wrong antenna. Having the ATU setting
by antenna specific would make this significantly easier.

If this isn't currently possible, I submit it as a feature request.

Thanks,
David
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