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
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