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Most don't have the filter width to pass the audio, that's the main reason.  Have to add the optional AM filters and even most of those are just 8kHz so that's a 4kHz audio pass band...which certainly sounds decent, but not like the ridiculous 20kHz that the transformer modulated setups a lot of the class E guys use, which gives you a 10kHz audio pass band width.


You can certainly talk to people on AM with a 25W carrier rig, if the conditions are decent...that's the key.  The band has to be pretty short and not noisy, but it's certainly possible and fairly often doable.


Just be sure you have something to add to the conversation if you jump in or you'll take a beating.  The AM crowd tends to be highly technical and they don't spare much time for people with nothing to add to the conversation that is going on either.