[Elecraft] K2: Power calibration?

[Jay]

Randy,

Don said:
> 
> The WM2 must be calibrated and verified before it can be trusted, and
> similarly the wattmeter section of the KAT2, KAT100 and KPA100 must be
> calibrated before they can be trusted.  After any of these instruments
> have been calibrated, the dependency on the precise 50 ohm dummy load
> goes away. but some instruments will indicate forward power and reverse
> power, and the two must be subtracted for the net power, while others
> will do that calculation automatically.  As a user, you must know the
> characteristics of your measuring instrument before you can correctly
> interpret its readings.
>

Don is very correct in this.  

I have a WM-2 and found it to be "way off" when adjusted according to the
instructions and working into a 50 ohm load.  I finally hung a scope on the input to
the dummy load and set my K2 to 40m and 5 watts.  I adjusted the WM-2 to read the
calculated input power at the dummy load based on the pk-pk signal.  The K2 and WM-2
were then "close enough" with each other on 40m.  Since then, I have relied on the K2
power output.

Vy 73
Jay
AJ4AY
Mobile, AL 
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