Good catch! I should have emphasized that the length of a 50-ohm connecting cable is irrelevant if both the source and load impedances are 50 ohms resistive. That happy coincidence is, of course, unlikely in the real world.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, June 29, 2007 11:58 AM To: [email protected] Subject: [Repeater-Builder] Cable formula Why would the presence or absence of +/- J affect the determination of whether or not the feedline is functioning as an impedance transformer? When the source and load impedances are different, even though purely resistive, won't the connecting cable still act as a line transformer? In a message dated 6/29/2007 11:39:44 A.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: If the output of the PA and the input of the duplexer were purely resistive, the cable length would be irrelevant.
