Vern, Did this problem exist before you had the duplexer tuned? Was anything at all done to your repeater system just before the problem was noticed?
A band reject (notch) duplexer may be incapable of performing even satisfactorily at 2m. Please advise the model number of your duplexer, so we can understand your situation. Are all of your cables double-shielded? It might be a good idea to perform a noise-floor test using an "iso-tee" and a service monitor. Some helpful information about investigating desense problems can be found here: <www.repeater-builder.com/ge/datafile-bulletin/df-10002-02.pdf> 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, September 24, 2007 7:02 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Duplexers I am having some receive problems on my repeater and I am thinking that it might be desense. I am on 2M running a MASTRII repeater with a Decibel Products band reject 6 can duplexer. While I can key the repeater from a pretty good distance the audio that makes it through the repeater drops off pretty quickly. I just had the duplexers tuned and they are tuned very well. So on to my question. If I were to take and separate the recv cans from the xmit cans and run to 2 separate antennas would that mess up the duplexer tuning? will 20' of vertical seperation plus the cans and the fact that I would be running through separate cable, make a difference? Thanks, Vern KI4ONW
