KPA500 Low Power on 6M

[Terry Burkholder]

I have a new KPA500. It works well on all HF bands but on six meters
with any more than 280 watts out I get a "PA DISS" fault. This is into a
500 watt dummy load. External Diawa CN 801 power meter power reading
agrees with the KPA500 wattmeter.

At 280 Watts out the drive, from the K3, on six meters is 20 Watts, HV
74 volts no load, 60 volts loaded, current 13.6 A SWR 1:1

Any suggestions?

Thanks, Terry N4TB

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[Michael Eberle]

I was having similar problems with my KPA500 on 6 meters.  I originally
had it set up for 240 volt operation.  Changing it over to 120 volt
operation seems to have helped quite a bit.  Also I changed transformer
taps because the HV pulled a little low on TX.  I still get a fault now
and then but believe it may have to do with some SWR on my 6 meter antenna.

Mike
KI0HA

On 3/30/2015 13:55, Terry Burkholder wrote:

> I have a new KPA500. It works well on all HF bands but on six meters
> with any more than 280 watts out I get a "PA DISS" fault. This is into
> a 500 watt dummy load. External Diawa CN 801 power meter power reading
> agrees with the KPA500 wattmeter.
>
> At 280 Watts out the drive, from the K3, on six meters is 20 Watts, HV
> 74 volts no load, 60 volts loaded, current 13.6 A SWR 1:1
>
> Any suggestions?
>
> Thanks, Terry N4TB
>

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