Yes - I made that suggestion. I'm no RF engineer, but it seemed like an interesting idea. A circulator configured as an isolator (dummy load on the 3rd port) would be counterproductive, my idea was to hook the 3rd port to the receive chain, adding the reverse port to port isolation of the circulator to the existing isolation of the duplexer, and incidentally splitting a single antenna into separate TX and RX paths. I've got a VHF circulator here, and plan to load it up on my friend's network analyzer tonight and see just how far out in left field this idea is :-)
_____ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Wednesday, October 24, 2007 12:04 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: duplexer isolation and reciever noise budget At 09:51 AM 10/24/2007, you wrote: >OK, I have to comment, > >An isolator/circulator should not be used in a duplexer at the >antenna connector when there are other strong signals floating >around the air that can get into the isolator. <---Uhhhhh...a couple of things here: 1) Did I miss something here? Did someone suggest connecting a circulator to the antenna port of a duplexer? 2) The whole point of a circulator is to act as a "one-way" path for RF. Placing it in the antenna path is a bit counterproductive, no? 3) I disagree with your comments about "strong signals that can 'get into' the circulator. Again, that's the whole point, isn't it? Ken ---------------------------------------------------------- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcon <http://www.arcomcontrollers.com/> trollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp. <http://www.irlp.net> net "We don't just make 'em. We use 'em!"
