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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
