Hi,
A bit more information please...
1. How much power are you putting out?
2. How long in seconds before the SWR starts to increase?
3. What is the native antenna SWR, not what the tuner is showing, but
the real SWR?
4. Are you running with a balun of any kind?
5. What type of antenna?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 7/15/22 19:53, 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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