[Elecraft] Power Measurements with question

[Francis Belliveau]

I have completed my attempts to measure the power output from my K2 using an
o'scope.  I must say that my attempts were not successful.  For some reason
when set to 10 watts I get about twice the voltage as when set for 5 watts.
At 15.2 I get about 3 times.  This does not make sense because of the V*V
term would indicate 9 times the 5 watt output when set for 15 watts.  I know
that this cannot be true!

Now I do have a KAT2 installed and as I understand it this should improve
the accuracy of the power output because of the more accurate power
measurement.  I set the K2 to display output power and got the following
results:

    MHz  Req=5.0  Req=10.0  Req=15.2
     3.6        6.4         12.6          16.1
     7.1        6.2         10.7          15.6
    10.1       5.5         11.5          15.5
    14.1       5.6         11.0          16.6
    18.1       5.2         11.1          14.8
    21.1       5.7         10.8          14.1
    24.9       5.7         11.0          14.4
    28.1       5.7         11.0          14.1


It certainly makes sense that when requesting 15.2 watts I get only 14 watts
at higher frequencies, but why would I ever get readings that are
significantly above the requested output power?
I thought that this reading is what tells the controller how much power to
output.

This is certainly a puzzle to me.

Fran