It's for a sailboat (all this has been hashed over in
rec.boats.electronics - I mistakenly cross-posted to
rec.radio.antenna, rather than rec.radio.amateur.antenna, so you guys
missed the thread there). The general consensus is it would be easier
to use two antennas, but I'd have to enlarge the holes in the
compression post under the mast and the mast itself in order to run
another cable. If I could find a pair of diplexers, then at least both
radio/antenna combos could share the same feedline up the mast...

Anyone know of a 2m/70cm diplexer with tight enough filter slope to
put the marine band on the same side as the 70cm, or one specific to
2m/marine?

Jon KB1HTW



John, I know that some duplexer manufacturer such as Tx/Rx (
http://www.txrx.com ) make a pretty small repeater duplexer for VHF that
would handle the split between amateur and marine band.... if you were to
separate the cavities and use them in your manner... but not sure if they
would still be frequency broad enough, or small enough if space is really
cramped in the cabin. Something to research, anyway.

QUESTION, though. What size or type of cable is currently run up in
the mast?

Ed