I had a similar issue, and received this reply from Dick Dievendorff. I hope it helps you, as it did me. Forwarded with Dick's permission.
73 Eric WD6DBM On Wed, Nov 13, 2019 at 6:14 AM, Dick Dievendorff <d...@elecraft.com> wrote: Hi, Eric! There is an ATU MODE SWITCH menu setting that might influence this. With "ALL BANDS", the ATU Mode doesn't change from band to band. If you change the ATU Mode to BYP on one band, it should stay bypassed as you switch from band to band. If you have ATU MODE SWITCH set to "PER BAND" and turn the ATU to Bypass on 20 meters, then band switch to 30 meters, the ATU should return to the last-used ATU MODE on the new (30-meter) band. That might enable the ATU on band switch. I did exactly what you said you did with 2.38; I set the amp to STBY, ATU mode to BYP, turned the K3 ATU on and pressed ATU TUNE on the K3. The amp's SWR bar shows SWR, but the amp's ATU didn't change from its bypassed setting and it didn't start tuning. If the KPA1500 ATU Mode is "Bypass", (ATU IN LED dark) it shouldn't start tuning on its own. If both ATU IN and BYP are lit, that means the ATU Mode is "IN" (meaning "ATU function enabled"), but the current ATU setting is bypassed. Then it should change ATU settings when needed. It's a fine point on ATU MODE bypass versus ATU MODE IN with ATU setting currently bypassed. The ATU, when in, can set relays for a number of inductors and capacitors. During ATU tuning it might find that "all relays bypassed" is the best setting to choose. The ATU then uses its "bypassed" relay settings, but the ATU MODE is still "in", meaning "ATU function enabled". I didn't initially show both LEDs when the ATU is both "enabled" and the current ATU setting is "bypassed", but in Field Test it was suggested that we indicate when the ATU is currently set to its bypassed setting. I didn't do that in KAT500. So if the "IN" LED is lit, the ATU is not in ATU MODE BYP, even if the ATU BYP LED is also lit. If the amp is in Mode STBY, and the ATU is *not* bypassed, the ATU should retune if its "ATU HiSWR" setting is on for 30 meters. The intent is that the KPA1500's ATU should be available at 100W, with the KPA1500 in STBY, perhaps some don't have an ATU in their exciter and can use the amp's ATU without using the amp's PA. If you want the amp's ATU available on 30 meters, but don't want it retuning on its own, turn off ATU HiSWR RETUNE for 30 meters. Hope I haven't made this more confusing... We're trying to satisfy a lot of differing situations. 73 de Dick, K6KR On Sun, Aug 2, 2020, 6:38 AM N4ZR <n...@comcast.net> wrote: > Last night in NAQP I noticed that on 80 meters my tuner would hunt > endlessly, calling for tune power, then finishing, then asking again > with the ATU IN LED blinking. <snipped> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
