[Elecraft] Using the K3s Tune button causes a growing SWR on my KPA500

[Peder Kittelson]

When on 80 meters, the longer I hold the tune button down the higher the
SWR goes to the point the KPA500 folds back with warnings.  I don't usually
hold down the tune button longer than about 5-6 seconds.

I use a Manual Palstar BT1500A tuner which does a good job of tuning my
EFHW wire antenna.  So the initial tune is very good. I sometimes will hold
down the Tune button on the K3s for maybe 5-6 seconds with the initial tune
at 1-1 SWR.

The KP500 first shows a 1-1 SWR.  Then 1.2-1, 1.3-1 and so on.  I stop when
it reaches 1.5-1.

I suppose that initially the transmitting wire sends out the signal and
over time the current backs up.  I have torroids in place to prevent RFI
coming back down the antenna transmission line.

I only use the system for CW.  So when I send, the problem does not
escalate to the point of a dangerous SWR.

I wonder if this is a normal problem when holding the tuning button
longer?  And since I do not hold down the key for a long period of time it
doesn't develop.

Still, I am looking at solutions. And I am concerned.

Your thoughts?

-- 
Peder Kittelson, W7RPK