[Elecraft] KX2, KX3, and supply voltage vs. power output

[Wes]

Wow two experts and they're both wrong.

Fortunately CW is neither an unmodulated carrier nor is it 100% modulation by a 
square wave.  Dots with no waveform shaping would be a square wave; dashes are 
never a square wave.

Keyed CW is none of the above.

On 5/24/2016 9:37 AM, Jim Brown wrote:
> On Tue,5/24/2016 8:23 AM, Wayne Burdick wrote:
>> In CW mode, there's no issue with doing this, since it's just an unmodulated 
>> carrier.
>
> Not true, Wayne. CW is 100% modulation of a carrier by a square wave, the 
> square wave includes harmonics, which produce IMD. THAT'S what clicks are. You 
> should know that -- your spectacularly good waveshaping of the keying waveform 
> in your radios is a major reason why they're so clean on CW!  But they DO get 
> wider when supply voltage drops, and as power output increases, BECAUSE IMD 
> increases.
>
>> In voice and data modes, we strongly recommend using higher voltages at full 
>> power output. This will result in much better suppression of IMD products 
>> (unwanted higher-order sidebands).
>
> Yes.
>
> 73, Jim K9YC