[Elecraft] W1

[Gary Smith]

Because accuracy is or isn't.

73,

HNY 

Gary
KA1J

> Just wondering. Why is an accuracy within less than 1dB important?
> 
> Happy New Year.
> 
> 73,
> 
> Bob Nobis - N7RJN
> n7rjn at nobis.net
> 
> 
> > On Dec 31, 2015, at 09:42, Ed Lambert <g_e_lambert at comcast.net> wrote:
> > 
> > John,
> > 
> > Thank you for your response.
> > My original K3s test setup was per the manual: good quality dummy load (not
> > the DL1 because of its 20 watt upper limit) with the ATU off. My high
> > quality dummy load does not have a test point.
> > After reading your results, I decided to take the DL1 as my "truth model". I
> > found that the W1 display was 0.8 dB high and the K3s power display was 0.9
> > dB low. Each one was at the opposite end of the error budget. (sort of like
> > winning the "losers" lottery).
> > So, I set up the W1 to match the DL1 up to 20 watts and, surprise, the W1 TP
> > voltage is now 4.87 volts.
> > I don't have the W1 software and cabling installed yet. At that time I can
> > fine tune all of this.
> > It seems as though a consensus is building that the W1 manual specification
> > of 4.5 volts is no longer correct, unless there is something "off" with the
> > W1 internal algorithm.
> > Good stuff. Thank you everyone for your comments and help.
> > 
> > -----Original Message-----
> > From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John
> > Oppenheimer
> > Sent: Thursday, December 31, 2015 7:22 AM
> > To: elecraft at mailman.qth.net
> > Subject: Re: [Elecraft] W1
> > 
> > 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
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