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I'm wondering why anyone would use a com radio antenna diplexer in the first place.  There's plenty of room in the tail for 2 com radio antennas (one toward the front of the vertical and the other in the rudder) and, on the 2-place airplanes you can put one in the vertical and one in the tail cone.  Use of a diplexer limits one's flexibility with communications.  If the diplexer should fail in just the right way, maybe you wouldn't have any communications at all.  Of course the cost of a second antenna is less expensive than a diplexer in the first place.  With only one antenna what would you want with an audio panel either?

Pete Cavitt - N320PL
619-283-7473

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