[Elecraft] L1 vs W1 Power Reading

[Bryan, ZL1NI]

Thanks Don.

The only calibration I did for the W1 was the procedure in the manual.

Bryan, Zl1NI


> Brian,
> 
> Unless you used a very accurate wattmeter to calibrate the W1, I
> would
> believe the DL1.
> HOWEVER:  The formula in the DL1 manual is not correct.  8.97 volts
> measured from the DL1 properly indicates 3.44 watts.
> The correct formula for the DL1 is (Vdmm + Vdiode)^2/25.  You can
> measure the actual forward voltage drop of you diode in the DL1 and
> substitute into the formula above, or assume the diode drop is 0.3
> volts.
> 
> I believe an updated DL1 manual may be due with the corrected power
> formula - I submitted the power formula derivation to Bob Friess (he
> designed the DL1) and he accepted it.
> 
> 73,
> Don W3FPR
>