I was looking at the same general idea for combining a 2m repeater with 2 simplex radios (APRS and WinLink) on the same antenna - it MIGHT have worked - but I got the repeater on 440 which eliminated a lot of problems trying to work 4 frequencies within a 1mhz span.
In general though - a hybrid ring isn't going to get you much more than 25-30db of isolation, so you will still need band pass filters between the RX/TX and the ring.. as much as needed to achieve the isolation needed based on your TX power . hehehe what do you make a cavity filter for 10 meters out of ?? two stacked beer kegs ??? hi hi :-) Note also that using a ring duplexer like this will pump any reflected power from the feed/antenna right back into the RX path. so everything needs to be extremely well matched. Feeding 100w into a 1.2:1 VSWR will pump nearly 0.1w back into the RX path, where the only thing slowing it down is your RX filters _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of DCFluX Sent: Tuesday, January 29, 2008 1:04 PM To: [email protected] Subject: Re: [Repeater-Builder] 10 Meter Repeater What about a Hybrid-Ring style duplexer? With 1 5/8 hardline and copper water pipe variable sections for tuning?
