> -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Eric Lemmon > Sent: Thursday, March 22, 2007 11:15 PM > To: [email protected] > Subject: RE: [Repeater-Builder] LMR feedline revisited and revised! >
> Where the impedance is > not > constant, unwanted parasitic oscillations can occur, which means that > intermodulation and spurious signals have a fertile breeding ground. > I wouldn't say that a non constant impedance will cause parisitics or intermod. Many times deliberate impedance changes are made in transmission lines. For example a piece of 75 ohm line can be used in a 50 ohm system with an impedance transformer on each end. At the junction of the 75 ohm cable and the transformer there is a large non constant impedance in the line. Works fine. 73 Gary K4FMX
