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In theory, say you have a radio that is only low level modulation such as many current day HF radios that can only provide lets say 70% modulation, and you run an amp behind and the combination is set up to run 1:4 ( or 4:1 I can't remember how that is stated) does that in any way make up for the low level modulation and provide more usable AM operation.  The whole low level modulation is confusing so I am not sure what the end result is when using an amp...