[Elecraft] Low Power Output on 160 and 6 meters

[Don Wilhelm]

Everett,

What is your power supply voltage during transmit at 100 watts as 
measured with the Alternate VFO B display?

With a solid 13.8 volt power supply voltage, you should see no lower 
than 12.7 volts (there is a diode drop inside the K3).

If lower, check the connections in the power cable for tightness.
The K3 power cable should run direct from the power supply.  Rigrunner 
and other DC power distribution boxes can be reason for excessive 
voltage drop.

You can increase the power supply voltage up to above 14 volts to help - 
do not exceed 15 volts.

73,
Don W3FPR

On 6/24/2019 6:51 PM, EVERETT SHARP via Elecraft wrote:
> I have three K3S and over the week-end I connected each of them to my Bird watt meter, with a Dummy load. Each of K3S were updated to the current Firmware and each had the 5 and 50 watt calibrations run.
> 
> What I found was all 3 showed from 80 to 90 watts output on 160 meters and on 6  meters I saw 75 to 90 watts. All other bands showed typically
> 105 to 110 watts. However, one of the K3S showed exactly 100 watts on all bands except for the lower power on 160 and 6 meters.
>