We're going to build a 6m repeater in a place where space is very limited, which means that building a full-size cavity duplexer is not an option.
Of course there's the heliax duplexer, but I would also like to evaluate other possibilities, i.e. the helical duplexer or even a hybrid ring duplexer with helical resonators. I have got some theoretical info about them, but very few info about actual built units. Has anyone (successfully or not) built a helical or hybrid ring duplexer for 6m? Any info appreciated! 73 Martin
