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A good amplifier that is linear does not change the modulation percentage. If you have 70% modulation going in that's exactly what should come out. In reality there are slight variations but not much.

Just because you have a (low level) ssb rig with a balanced modulator doesn't mean it can't achieve 100% mod or more. The manufacturers sometimes do a half fast job in the AM dept.

The difference between high level and low level is how the modulation is mixed with the carrier. High level modulates the carrier at the finals. Can be more efficient because the final runs in class C but requires more modulator power. Low level modulation happens at an earlier stage. Requires less modulator power but the finals are less efficient. The finals in the rig are just a linear amplifier.

[QUOTE="543_Dallas, post: 737294, member: 21044"] A good amplifier that is linear does not change the modulation percentage. If you have 70% modulation going in that's exactly what should come out. In reality there are slight variations but not much. Just because you have a (low level) ssb rig with a balanced modulator doesn't mean it can't achieve 100% mod or more. The manufacturers sometimes do a half fast job in the AM dept. The difference between high level and low level is how the modulation is mixed with the carrier. High level modulates the carrier at the finals. Can be more efficient because the final runs in class C but requires more modulator power. Low level modulation happens at an earlier stage. Requires less modulator power but the finals are less efficient. The finals in the rig are just a linear amplifier. [/QUOTE]

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