http://elecraft.85.s1.nabble.com/K3-LPA-power-level-accuracy-tp5688027p5688038.html
There's also an adjustment that you can make manually to move the power up or down from what the meter is reflecting on the K3, have you tried that too?
> Date: Fri, 29 Oct 2010 17:00:21 -0400
> From:
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> To:
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> Subject: [Elecraft] K3: LPA power level accuracy?
>
> Hello fellow Elecrafters,
>
> Quick question - I've noticed that when using the LPA, output power is
> always slightly off compared to the reading given off by two fairly accurate
> meters. For example, a constant carrier output of 5 watts always reads
> about a half-watt less on the external meters. The output power from the
> KPA3 however has always been on the dot - 80 watts drive reads 80 on the
> meter, 100 watts output reads 100W on the meter, etc. etc.
>
> I'm not really concerned, but was wondering if this was typical? I've
> calibrated several times in the past using the K3 utility, but the results
> are usually the same.
>
> --
> 73 de James K2QI
> President UNARC/4U1UN
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