[Elecraft] KPA 100 Low power on 160M

[Don Wilhelm]

Andrew,

If the KPA100 low pass filter were a problem it would misbehave at both 
the low and high power ranges because it is always in the circuit with 
the KPA100 connected.

A "Hi Cur" message means the *base K2* is drawing current in excess of 
the CAL CUR setting, and the power will be reduced to control the current.

If the HI CUR message only shows up when driving the KPA100, then I 
would look for a problem in the input of the KPA100, or mis-calibration 
of the wattmeter in the KPA100.  If you bumped the setting for R26 while 
working on the KPA100, that in itself may be sufficient to explain the 
HI CUR indication.  Did you measure the actual power output with an 
external wattmeter or are you depending on the K2 display?  If the 
internal wattmeter is not properly calibrated, the actual power output 
can be much greater than indicated by the K2.

73,
Don W3FPR


Andrew Lenton wrote:
> Hi Don,
>
> Thanks for that, Putting aside the K2's low power on 160, which no doubt has
> a component error value somewhere, the KPA 100 has been working at 111 Watts
> for two years until I disturbed the PA last week to make way for the DSP
> board. So something has happened to the KPA100. I only get a high current
> warning when the KPA100 is in use. 80 to 10 Metres is fine 11 watts no
> warnings! I think something has happened to the high power low pass filter,
> any thoughts?
>
> 73
>
> Andrew G8UUG
>   
>