[Elecraft] KAT3 ATU Problem

2021-12-15 Thread Tom Boucher
Mike K8CN wrote *< It wouldn't have occurred to me to look atthe LPA stage as a source of trouble, but ifthe TX power is ramping up slowly, then I cansee where the ATU control algorithm isconfused by the change in power levels bothforward and reflected. My ATU seems tochang

Re: [Elecraft] KAT3 ATU Problem

2021-12-12 Thread Michael Carter
Tom, Glad that the MotherShip is helping out directly! It wouldn't have occurred to me to look at the LPA stage as a source of trouble, but if the TX power is ramping up slowly, then I can see where the ATU control algorithm is confused by the change in power levels both forward and reflected. M

[Elecraft] KAT3 ATU Problem

2021-12-11 Thread Tom Boucher
Mike (K8CN) and others - thanks for your inputs. I'm talking to Paul at Elecraft Tech Support who, by the way, is being most helpful. He reckons I have a problem with the Low Power Amplifier which takes a few seconds to come up to full output power. I'm not at all sure how that affects the SWR mea