If adjacent hardlines have excessive mutual coupling, I'd look into decoupling RF currect flowing on the outside of the shields.
----- Original Message ----- From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Saturday, July 19, 2008 10:41 AM Subject: [Repeater-Builder] Re: Duplexer Tuning / Desense I have seen at least one clearly demonstrated case where even adjacent hard-line runs have had excessive mutual energy coupling. Go figure... **** As an optimist I hope for the best using the supplied cables. As a skeptic I'm pleasantly surprised when the supplied cables work as described. As a pessimist I'm not surprised when a gremlin or a train-wreck finds its way into a time critical duplexer - antenna system project. cheers, s. > And I would add to the rule of thumb that the cable MUST be *silver* > plated braid, which much or most of RG214 brands and probably all of > RG142 is composed of. Or, my favorite is 1/4" Superflex, solid copper > shield.
