[Elecraft] K2 power output measurement accuracy?

[Stewart Baker]

100 MW now that's what I call QRPP !

When is the next Elecraft QRO amp due ?

:)

73
Stewart G3RXQ

On Wed, 24 May 2006 07:45:19 -0700 (PDT), Curt wrote:
> I tried TWO good watt meters on the K2 and I found that the K2 is NOT
> accurate. The ONLY place I found it to be accurate is at exactly two watts. I
> also found that my K2/100 will go down to 100 Mw then jump to just over one
> watt, then to over to three and etc, it's not a smooth transition. I wish it
> would go from zero all the way up smoothly,  but no way.  My Icom is a lot
> smoother but will only go down to 1 1/2 watts. Working QRPP with my K2
> requires 100 MW and thatâ€â„¢s all because it's too jumpy to set anywhere 
else.
> I don't have RF problems as far as I know but it sure is acting like it with
> the K2 but NOT on the Icom. That is my only beef with the K2 because my Icom
> acts more like a real QRP rig that the K2 does.
>
>
> k3ey
>
> k2/100 s/n 5417
>
> "Darwin, Keith" wrote: My K2 and my watt meter do
> not agree.  When I set the K2 power output at
> 5 watts I get almost 10 according to the external watt meter.  Setting
> K2 power output at about 12 watts gives something between 15 and 20 out
> on the external meter.  At settings above about 13 watts on the K2 knob,
> I get the high current warning.
>
> This is all driving a 1.2 : 1 or lower SWR, btw.
>
> It leads me to believe the K2's power output is fine but it's ability to
> measure and report it is off.
>
> How accurate is the power output control knob supposed to be?  I don't
> recall doing any calibration steps or alignment steps that affect that
> part of the rig.
>
> I have not (yet) measured voltage into a 50 ohm dummy load but am
> seriously considering dragging the rig, PS, dummy load & cables into
> work to have access to a scope.
>
> - Keith KD1E -
> - K2 5411 -
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