Something in the antenna system is heating up. Ferrite
baluns/transformers are likely culprits.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 16-Jul-2022 05:53, Peder Kittelson wrote:
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?
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