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Let us not forget that that 150% or 200% modulation pertains to ONLY the positive peaks and NOT the negative peaks.It is negative modulation in excess of 100% that causes carrier cut-off and distortion/splatter. Commercial AM broadcast stations routinely run asymmetrical modulation of 120% positive while maintaining 100% negative mod. I had a problem with the modulator in a Nautel Amphet-1 transmitter one time and tested it to 100% neg/200% pos modulation when I was done repairing it. The 'scope sure looked weird and that SOB was LOUD as hell on the air..........errrrr......make that the dummy load ......... but clean.

<blockquote data-quote="Captain Kilowatt" data-source="post: 404942" data-attributes="member: 39"><p>Let us not forget that that 150% or 200% modulation pertains to ONLY the positive peaks and NOT the negative peaks.It is negative modulation in excess of 100% that causes carrier cut-off and distortion/splatter. Commercial AM broadcast stations routinely run asymmetrical modulation of 120% positive while maintaining 100% negative mod. I had a problem with the modulator in a Nautel Amphet-1 transmitter one time and tested it to 100% neg/200% pos modulation when I was done repairing it. The &#039;scope sure looked weird and that SOB was LOUD as hell on the air..........errrrr......make that the dummy load <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f617.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":whistle:" title="Whistling&nbsp; &nbsp; :whistle:"&nbsp; data-smilie="29"data-shortname=":whistle:" />......... but clean.</p></blockquote><p></p>

[QUOTE="Captain Kilowatt, post: 404942, member: 39"] Let us not forget that that 150% or 200% modulation pertains to ONLY the positive peaks and NOT the negative peaks.It is negative modulation in excess of 100% that causes carrier cut-off and distortion/splatter. Commercial AM broadcast stations routinely run asymmetrical modulation of 120% positive while maintaining 100% negative mod. I had a problem with the modulator in a Nautel Amphet-1 transmitter one time and tested it to 100% neg/200% pos modulation when I was done repairing it. The 'scope sure looked weird and that SOB was LOUD as hell on the air..........errrrr......make that the dummy load :whistle:......... but clean. [/QUOTE]

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