I would look for some of the 12" VHF pass cans. You want the true pass cavities that have two connectors. Motorola, GE, DB Products and possibly others made them. They show up surplus every so often and for a 600 KHz close spaced 2 Meter repeater they really shine.
>From past experience with a good preselector type receiver front end and a >pair of these cavities 30 feet may be very do-able. Heliax is a must and you >may have to be careful of how much preamp you may or may not be able to get >away with on the receiver. Isolation is what you are after here and it can come in many different ways. Isolation in a repeater system is just like speed with a fast car, you can never have too much of it. Good Luck, Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, "kc0mlt" <kc0...@...> wrote: > > Ok just kicking this idea around the other day and the question came up about > antenna separation. I know the basic 2 meter antenna separation is 50ft. (I > am thinking 60ft to be safe) But is it possible to get them closer if I place > some cavities on either the receive or transmit sides. Sounds dumb from some > certian points of view, but I am waiting on the arrival of a decent duplexer > (could be some time out though)so in the mean time I would like to get this > up and going with a split antenna system for now. I was thinking maybe a 30ft > separation... Would this idea work? If so does it need to be modified from > what I was thinking? >
