Duplexer or Diplexer

Confused?

Essentially there is no difference, be it a Diplexer that has the capability to handle power isolating the RX, or the design allowing the split of the ports to handle power in both directions.
To the purists, the definition stated in the linked site is correct, but in practice a device that either combines two differing frequencies to one antenna, or two antennas to one dual band radio, is essentially the same device, no matter what you call it.

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Rob VK2YMU