[Elecraft] KPA100 another issue

[Don Wilhelm]

Jerry,

Have you done the KPA100 wattmeter balance (C1 adjustment) followed by 
the forward power calibration (R26)?  If not, the KPA100 may be putting 
out a lot more power than indicated by the K2.
If you do not have a good null on the C1 adjustment, you may as well 
stop and resolve that problem before attempting to go any further, it is 
a critical first step.  Most likely causes for a failure to null are a 
problem with T4 or D16, D17 orientation or soldering problems in the 
area of T4.

73,
Don W3FPR

n0jrn wrote:
> Well,   doesn't seem to my weekend.          :-)
>
> While checking the output of the KPA100  ( during test and alignment ) 
> completed the bias adjustment and began the transmit test.
>
> Connected to my 100 watt dummy load with short jumpers.  Watt meter in line 
> and checking the output compared to the meter.   Started on 40 meters and at 
> 20    watts all was good.  Moved the power up and noted the amp kicked out 
> around 35 watts. Started checking other bands at 20 watts and found that on 
> 15 meters,  my current draw went way up and my supplied voltage went way 
> down.up and my supplied voltage went way down.
>   
>