Get rid of the rg-8x and get some double shielded cable. Even a couple of feet of single shielded cable can cause much desense. Depending on the sensitivity and power level, a 4 cavity duplexer is just barley enough for a 600 KHz spacing on 2 meters.
--- On Fri, 7/18/08, Mike Besemer (WM4B) <[EMAIL PROTECTED]> wrote: From: Mike Besemer (WM4B) <[EMAIL PROTECTED]> Subject: [Repeater-Builder] Duplexer Tuning / Desense To: [email protected] Date: Friday, July 18, 2008, 10:33 PM most from your Repeater System’, and the one thing I need to do yet is check for internal desense. I had to replace the Teflon-type cable which leads from the Mark IV transmitter to the back panel, and when I replaced it, all I had was some RG-8X. I’m (sort of) hoping that’s the problem, but I won’t know until I check. I can’t see where I’ve missed anything obvious, although tuning these types of duplexers is new to me. I spent 17 years in the Air Force working navigation and comm gear, so I’m pretty well versed in what I’m doing, but since this is a new venture for me, I’m certainly open to suggestions. I’ll check for internal desense tomorrow, but in the meantime if anybody has anything to add, please chime in.
