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Your point #1 and the "RF out" BNC are the where the RF modulated by the internal audio frequency exist, as shown on your scope waveform. "MOD" on the control panel stands for "Modulation", not "modulated."
So, as stated above, the EXT MOD IN AF OUT is either external AF in or internal AF out.
Maybe they should have used a slash to indicate "or":
EXT MOD IN / AF OUT
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