@SCS: I was wondering, is it realistic that the 50/60hz machinery line is the "loudest," and not some sort of prop noise (maybe the 125hz?)?. That way, we could get DEMON for NB contacts on the appropriate line...which would bring back manual TMA and help classification.[/quote]
Lower frequencies travel much further while higher ones die off more quickly and will appear more faint over a longer distance.
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