[Elecraft] Which wattmeter do I believe?

[Paul Gates]

John, you will have a lot of fun with the KX1. I am getting ready to go on 
the Auto Train next Sunday to Fla and getting my KX1 ready to go. I have 
26ft of #26 Silky wire for a antenna and 32 ft wire for counterpoise... Also 
have the Super Antennas MP1 Vert. that I will take with me.
Paul Gates
K1  #0231
KX1 #1186
XG1
kd3jf at hotmail.com


----- Original Message ----- 
From: "John Pfeifer" <jpfeifer at gci.net>
To: <elecraft at mailman.qth.net>
Sent: Sunday, July 17, 2005 9:00 PM
Subject: [Elecraft] Which wattmeter do I believe?


> Just finished building KX-1 #1207 with 30m board and ATU.  Nice little 
> rig!
>
> After adjusting C9 on the KXAT-1 per the manual, I decided to compare the
> power output measurements obtained via the internal power sensor, a DL-1
> dummy load + DMM, and using my OHR WM-2 QRP wattmeter.  BTW, the supply
> voltage is 12.5v and I substituted a 33-ohm resistor for R30.  Output 
> before
> I changed R30 was about 1-watt lower across the board.  Here are the final
> measurements, as built:
>
> Band     DL-1+DMM     Internal      WM-2
> 20m        2.6           3          3.7
> 30m        3.7           4          4.7
> 40m        3.4           4.1        4.3
>
> Which wattmeter should I believe?  I tend to think the DL-1 plus my Fluke
> digital multimeter would give me the most accurate reading, but....
>
> Also, no matter how I fiddle with the spacing on L3, 20m output is always
> 1-watt less than on 30 and 40m.  I guess this is in line with what other
> folks have reported.
>
> tnx & 73,
> John Pfeifer - WL7M
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