[Elecraft] KPA500 Low Power on 6M

[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
>