[Elecraft] KX1 losing its match

[g4ilo at qsl.net]

I had an identical problem a few years ago with an SGC-239 autotuner that I 
originally used to tune my attic loop at the feedpoint. It was worst on 10 
metres. It was suggested to me that RF could be getting in to the tuner. I 
thought that was a bad joke, because an ATU ought to be pretty immune to 
RF, especially if it is capable of being used at the antenna feedpoint.

I thought about this when I ordered the T1. I seem to recall Wayne saying 
that one reason the T1 doesn't automatically retune if it senses a mismatch 
is because this can sometimes cause problems. Because of my experience with 
the SGC-239, this seemed like a definite advantage to me.

SGC sent me a new controller for the 239 that greatly reduced the incidence 
of this trouble, presumably by reducing the threshold at which it did a 
re-tune. I'm guessing that if there is an issue with the KX1, Elecraft 
could resolve it with a firmware change too, by making it work more like 
the T1 and only retuning if you change band or specifically tell it to.

Julian, G4ILO
G4ILO's Shack: http://www.tech-pro.net/g4ilo

"Trev - K6ESE" wrote:

>From my point of view it sounds like an RF on the rig problem...high 
voltage at the antenna connector may be triggering the ATU into some wierd 
tune state? It's just a guess, but in the past I've had similar problems 
with other rigs when this was the case, a voltage node at the rig...