[Elecraft] Issue Resolved K3 Voltage on TX

[Jim Brown]

On Tue,10/27/2015 8:46 AM, Bill W4ZV wrote:
> If you operate SSB, you might want to run higher voltage at the K3 terminals
> (e.g. at 14.5V which is below the 15.0V spec) to minimize IMD.

IMD is just as much a factor on CW as on SSB. CW is really 100% AM of a 
carrier by a square wave, which we all know is a lot of AF harmonics, 
the strength of which is dependent on the rise and fall time of the 
keying waveform. IMD is clearly visible in the sidebands of CW signals 
on a spectrum display set for very good frequency resolution -- like a 
P3, and especially a P3 with SVGA.

Take a look at http://k9yc.com/P3_Spectrum_Measurements.pdf

These data are with power supply voltage in the range of 12.5V.

73, Jim K9YC