[Elecraft] [K2] Erratic power control with base cw K2

[Don Wilhelm]

  Al,

Try it with regular keying - say a string of dots.  The LED bargraph is 
a good indicator of the instantaneous power output up to 10 watts - 1 
bar per watt.

The power control is intentionally more "sluggish" in TUNE than in 
normal keying as an assist to those who use a manual tuner.

The resolution on the 8 bit DAC controlling the VPWR level will produce 
about a +/- 0.5 watt variation from the power level that is set.

Moving the power control during a TUNE may produce some slightly erratic 
power level changes because there is a lot going on when you turn that knob.

What I am suggesting is that there may be no problem at all - check with 
normal CW keying.

73,
Don W3FPR

On 6/27/2011 4:05 AM, Alastair Couper wrote:
> I have a base K2 sn 1056, with a to b mods, including cw shaping mod, and
> the latest firmware. I have removed all options to ease troubleshooting.
> Turning the power control gives erratic power output, varying widely and
> randomly as I turn the control. If I turn the power control to max, then
> power is also max, but other positions are random. This happens on all
> bands, into 50 ohm load, and also using the antenna tuner option. Max
> power out is normal at about 15w, more or less. The rig works in all other
> aspects. Power supply shows 13.0 to 13.5 while transmitting.
>