RE: DL1 20W Dummy Load
Posted by
Don Wilhelm-3 on
May 14, 2005; 3:29pm
URL: http://elecraft.85.s1.nabble.com/DL1-20W-Dummy-Load-tp378360p378361.html
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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