[Elecraft] W1

[John Oppenheimer]

I performed some additional research, Johnny, VR2XMC, measured TP1 V at
4.82 back in December 2006. Maybe the 4.5 is a typo and should be 4.8:
http://elecraft.365791.n2.nabble.com/some-questions-of-W1-td442330.html

John KN5L

On 12/31/2015 06:22 AM, John Oppenheimer wrote:
> Hi Ed.
> 
> The W1 DC voltage calibration resulted with incorrect reading with my
> W1. My hunch is that components have changed since Elecraft established
> the TP1 DC calibration voltage almost a decade ago.
> 
> I have a KX3F with unchanged factory power calibration. Based on
> comments from Wayne, the KX3 is calibrated at 7.0 watts.
> 
> My W1 TP1 voltage is 4.812 using a Fluke 87V
> 
> Setting up a test bench with KX3 -> W1 -> DL1
> 
> Using W1 Utility to display W1 power:
> http://www.elecraft.com/software/W1/elecraft_w1_software.htm
> 
> TP1 V = 4.812
> KX3 power = 7.0 W
> W1 power = 7.02
> DL1 V = 12.91 = 6.93 watts
> 
> The W1 20 dB directional coupler does absorb power, at 7 watts, the
> directional coupler will absorb 0.07 watts. Adding 0.07 to the DL1
> measurements equals 7.00 watts.
> 
> John KN5L