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:[email protected]] 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
