[Elecraft] K3S Power Issue

[Walter Underwood]

If you don’t have a 100 W dummy load, I recommend this one. For $40 and an hour or so of soldering, you’ll have one. I built this just before assembling my KXPA100.

http://www.ohr.com/rfl100.htm <http://www.ohr.com/rfl100.htm>

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 27, 2017, at 5:39 PM, Edward R Cole <kl7uw at acsalaska.net> wrote:
> 
> Normally, I do not respond to most of these issues; Don is an expert and gives great advice.
> 
> What you last wrote shows that you NEED to do a TX Gain Calibration.  Your external power meter shows full output, so the K3s meter ckts need to be re-calibrated to agree with the ext. meter reading (assuming you trust the external meter).
> 
> Be sure that you use a 50-ohm non-reactive load (translation: a good dummy load).  If you measure into an antenna with any SWR > 1.05 the output power will not read accurately.  Power meters (SWR meters) are actually RF voltmeters and require a "perfect" 50-ohms to read correctly.
> 
> GL sounds like you are close to "fixing" your issues.
> 
> 73, Ed - KL7UW
> 
> Date: Mon, 27 Mar 2017 14:17:24 -0700 (MST)
> From: Serge_VA3SB <smbertuzzo at bell.net>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3S Power Issue
> 
>  Thank you very much for your prompt response Don. 
>  I have conducted a couple of additional tests and with an external power meter, even though the K3S indicates a power output of 75-80W, my external meter shows a power output of 100W. 
>  I will tighten all of the connections and my try some other cables as I only have the equipment connected on my desktop in the interim. 
>  Thanks again for your assistance.
>  73
>  Serge
>  VA3SB
> 
> 
> 73, Ed - KL7UW
>  http://www.kl7uw.com
> Dubus-NA Business mail:
>  dubususa at gmail.com 
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