[Elecraft] K2 and kpa100

[Don Wilhelm]

Scott,

That problem is caused by a failure of the power output from the KPA100 
to be reported back to the K2 microprocessor.

Check the wattmeter section of your KPA100.  First check to be certain 
T4 is installed correctly (check the color of each lead), and be certain 
that the leads are well tinned.

Be certain D16 and D17 are oriented correctly (check the KPA100 parts 
placement diagram).

Check the setting of R26 and R27 - the trimmer should be near the 
center.  The usual setting results in a resistance from the wiper to 
ground equal to about 43k.

If those things do not correct the problem, you will have to do some 
detailed measurements.

73,
Don W3FPR

Scott McDowell wrote:
> Hello
> 
> I have a kpa100 installed on my K2 and the pka100 seems to work fine 
> except for one thing.
> When I turn the power output knob past 10 watts the rig immediately goes 
> to 100 watts out.
> Going the other way it stays on 100 watts until  the power output knob 
> gets down to 10
> watts.
> I feel that it's a setting that I don't have right but have been unable 
> to find out which one.
> Has anyone ever had this kind of problem?
> Thanks
> Scott N5SM