If you see several db difference with a 12.5 KHz frequency shift then your duplexer is also distorting your audio on the transmitted signal. It would induce unwanted phase shifts and also unwanted amplitude changes in the transmitted signal.
73 Gary K4FMX > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of skipp025 > Sent: Monday, June 30, 2008 1:49 AM > To: [email protected] > Subject: [Repeater-Builder] Re: Frequency Change do I retune duplexer? > > Hi Paul, > > I go the other way where multiple Duplexer High-Q Series Cavities > have a deep sharp reject notch and a 12.5 KHz shift from F-center > results in a quite noticeable performance change. > > cheers, > s. > > > > > "Paul Plack" <[EMAIL PROTECTED]> wrote: > > > > The answer also needs to account for the fact that the duplexer > > might already be imperfect in its tuning, especially if it's > > old or has been moved around. 12.5 kHz one way might be > > fine...12.5 kHz the other direction might be noticeable. > > > > 73, > > Paul, AE4KR > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
