[Elecraft] K2 power output measurement accuracy?

[Don Wilhelm]

Curt,

The base K2 power reading is quite accurate if (and only if) the load is 50
ohms pure resistance.  See my other post on the subject.

Since you have a K2/100, the included wattmeter should be as accurate as
your calibration of it.  Prhaps you should re-do the calibration - or
possibly both your external wattmeters are not properly calibrated (see my
other post for more info)

73,
Don W3FPR

-----Original Message-----

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 that’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" <Keith.Darwin at goodrich.com> 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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