[Elecraft] K2 automatic tuner

[ab2tc]

Hi all,

I can think of one other *possible* explanation, although far fetched. If
the K2 transmitter has excessive harmonics or parasitics, this could happen.
The out of band energy is readily absorbed by the dummy load but not by the
tuned load presented by the LDG tuner. The antenna analyzer should easily
resolve this.

AB2TC - Knut



Don Wilhelm wrote
> William,
> 
> That indicates that either you have a bad coax between the K2 and the 
> tuner, or the tuner's SWR meter has a problem.
> 
> If you have an antenna analyzer, connect it to the same coax that you 
> connect to the K2 and see what it indicates.
> 
> It may be that the KPA100 wattmeter could stand some refinement, but 
> that would take some special dummy loads - I use a 25 ohm and a 100 ohm 
> dummy load to refine the setting of capacitor C1 - the SWR indication 
> should be the *same* for each of these loads if C1 is set to exactly the 
> null point.  That is more precise than finding the voltage null.
> After doing that adjustment, I set R27 to show SWR at the 2.0-1 point 
> and then set R26 to indicate the power while driving a 50 ohm dummy load 
> and an external wattmeter that I know is properly calibrated.
> 
> 73,
> Don W3FPR
> <snip>





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