[Elecraft] RF Probe measurments - K1

[James C. Hall, MD]

Hello:

Today I built an RF probe to calibrate power output on my K1 after adding
the antenna tuner unit.  In the instructions for calibration, the 5.0 watt
setting on the meter is to corrolate to a DC volt reading of 14 volts using
the probe on the center pin of the dummy load.  My question is how does one
come up with that corrolation, since the equation is P= E^2 / R .  Plugging
the numbers in : (14 v)^2 / 50 ohms = 3.92 watts.  Where is the missing
volts ?

My probe saw 19 volts at max output which corrolates to 7.2 watts out - and
that's what the meter shows as well.

Neat beginner project - the RF probe !

Jamie
WB4YDL