K2 RF power fluctuate

[barry halterman]

Greetings. I just completed my K2 build and the RX works great. Wish I
would have done this years ago. One issue I noticed with the transmitter is
that when I press the tune button, the output power will either be above or
below the power control setting. I found this during the transmitter
alignment phase of the build.
If I have the output power set for 2 watts, I get 2.8 or 1.6. if I have the
output set at 10 watts I get 9 or 5 watts. I am using an external watt
meter and I verified that the voltage to the K2 is around 13.6 volts. This
occurs on all bands by the way.
I have checked RF voltages back to the control board at Q8 Valc and found
that the output voltage , at this point, varies by a few tenths of a mv,
thus changing the drive power down the line, changing the output power that
changes the Valc output..... Round robin situation!!
Anyone have a similar situation?
Thanks
Barry
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[Don Wilhelm]

Barry,

The TUNE power is not as tightly controlled by the firmware as normal CW
keying.
That was done as an aid to those using manual antenna tuners.  The K2
normally tries to keep the power steady at the requested power.

73,
Don W3FPR

On 7/26/2020 11:21 AM, barry halterman wrote:
> Greetings. I just completed my K2 build and the RX works great. Wish I
> would have done this years ago. One issue I noticed with the transmitter is
> that when I press the tune button, the output power will either be above or
> below the power control setting. I found this during the transmitter
> alignment phase of the build.
> If I have the output power set for 2 watts, I get 2.8 or 1.6. if I have the
> output set at 10 watts I get 9 or 5 watts. I am using an external watt
> meter and I verified that the voltage to the K2 is around 13.6 volts. This
> occurs on all bands by the way.
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