[Elecraft] KPA500 power fluctuations

[Poul Erik Karlshøj (PKA)]

For a while I have noticed that the KPA output indikations on both THE LEDs and the LCD display is fluctuating. The highest LED is flickering and the last two digits of the LCD are also fluctuating (hard to read, but at 500W it varies about 10W I think). It is the same at any power level from 20W to 500W. It is the same with the amp ON and STBY, so it seems to be a problem in the power monitoring circuit.

It is certain that the fault is in the KPA. I had another KPA connected to the K3 and its power indication was steady - just like they were on my own KPA until a few months ago. It is the same whether the amp is connected to a dummy load or an antenna and I dont hear anything unusual listening on a monitoring K2.

I did not yet have an opportunity to look at the power envelope on an instrument. So I dont know if the flickering is random like noise or not.

I thought that may be someone else on this list has seen this fault and might explain what's wrong.

/Poul-Erik
OZ4UN

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