This Triplexer, built to feed three separate transceivers into one triband antenna, is built into a section of old M290 series housing extrusion. The connectors are fitted to the reverse side of a pcb implimentation as shown above.
Ant - 6m port 0.1dB loss
Ant - 2m port 0.3dB loss Return loss on all ports better than 25dB
Ant - 70cm port 0.8dB loss
6m port - 55dB from the 2m source, 40dB from the 70cm source
2m port - 55dB from the 6m source, 28dB from the 70cm source
70cm port - 70dB from the 2m source, 100dB from the 6m source
The 28 and 40dB isolation figures may seem poor, but in each case the apparently endangered transceiver will be further protected by its own antenna low pass filter.
*The coils are all wound with 1.25mm enamelled wire, closewound (Thanks to VE2KBM for pointing out this ommision!).