[Elecraft] DL1 20W Dummy Load

[W3FPR - Don Wilhelm]

Bruce,

Look in the DL1 instruction manual - there is a graph of power vs. output
voltage properly compensated for the diode curve.

The first page of the DL1 manual provides the formula of P=((Vx1.414)
+0.15)^2/50  -- for those with sharp eyes, there is an extra right paren in
th eequation in the manual.  Simplifying the formula to V^2/25 will work at
higher power levels where the diode drop becomes insignificant (about 2
watts and above).

73,
Don W3FPR

> -----Original Message-----

>
> I was doing a calibration of a KAT2 I just built and had a significant
> error to adjust for Forward power (displayed power was ~30% of
> measured). When I looked closely at the DL1 I noticed the trace to the
> detector comes from the center of the 50 ohm load. That means the
> detected voltage is across 1/2 the load (25 ohms) and changes the power
> calc to V^2/25 = P vs. of V^2/50 = P. Can someone confirm this?
>
> Thanks...
>
> Bruce Bowman NM5B
> Sasnta Fe, NM
>
>
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