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“It is recent news to hear that AM antennas have been diplexed. So, what’s in it for us? I mean, can Part 15ers diplex?”
Remember our discussion in answering your question about taking two or more CC stations into a single coupling point?
The answer is through a diplexer. This is a device very common in all kinds of multiple transmitter/receiver installations where a “community” antenna or tower is used for everything.
Very old technique and not anything one could say is “new news”.
A Part 15 station can do the same thing. Grab a copy of any ARRL handbook publication and look at how a repeater station’s receiver and transmitter is combined to use a single antenna and feed line. Those use a duplexer unit, which is basically the same thing as a diplexer.
Just change the numbers for the frequency/s your working with
and you can make a diplexer or a duplexer for a Part 15 station.