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Nav radio di-plexers are just antenna splitters since nav radios only receive.

Com radios connected to the same antenna must have a "transmit" activated switch (relay) to shut off the antenna feed to the non-transmitting radio so the 5 or 10 watts of power sent by the transmitter doesn't blow up the other receiver.  This type of di-plexer is expensive, but not as expensive as the repair work to a burnt up radio.

Scott Krueger
N92EX

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