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NU9N has it correct. High level meaning high power modulator in series with DC supply to class C R.F. stage. The one polarity of the AC will cut the carrier off if the AC voltage exceeds the DC supply voltage to the R.F. amplifier.

Low level assumes a balanced modulator in his pictures. You can't cut off the carrier with a balanced modulator. It simply starts modulating in the positive direction.

[QUOTE="HiDef, post: 150660, member: 7734"] NU9N has it correct. High level meaning high power modulator in series with DC supply to class C R.F. stage. The one polarity of the AC will cut the carrier off if the AC voltage exceeds the DC supply voltage to the R.F. amplifier. Low level assumes a balanced modulator in his pictures. You can't cut off the carrier with a balanced modulator. It simply starts modulating in the positive direction. [/QUOTE]

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