Art,
It may be as simple as bad diodes in the wattmeter portion D16 and D17.
To easily check, set the power to 1 or 2 watts and measure the power
output into a dummy with an external wattmeter. If the power output is
12 to 17 watts on the external wattmeter (much greater than 1 or 2
watts), then replacing diodes D16 and D17 will restore things to normal.
73,
Don W3FPR
Arthur Lewis wrote:
> ----- Original Message -----
> From: Arthur Lewis
> To:
[hidden email]
> Sent: Wednesday, December 30, 2009 11:02 AM
> Subject: KPA 100
>
>
> I have a KPA100 with a problem. I have two K2/100 and if I exchange the KPA100s the rig works fine. Therefore the problem is not with the K2. The problem KPA100 was built in 2000 and was a good working unit until recently. Both of these units are top cover KPA100s.
>
> Problem:
> It seems to draw Hi Cur as soon as I start bringing up the power level and the output goes to something above 10 watts. After the relay clicks on the KPA100 the output on an external watt meter goes above 100 watts and the SWR on the external watt meter goes high. The power adjustment has little effect and the rig is drawing about 22 amps.
>
> Again if I exchange the KPA100 with one that is working properly, everything works normal. The rig draws about 13 amps at full power with the good KPA100 and at the low end, before the relay clicks, has full adustment and low current draw. The K2 seems to be working well on receive.
>
> Looking for seggestions. Is this self oscillation or perhaps a LPF problem?
>
>
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