Yes it does, if you have an isolator installed at the transmitter. With an isolator on the transmitter the transmitter will always see 50 ohms no matter what the load on the other end of the isolator is. There should be no problems with off frequency reactance when an isolator is used. But any reflected power into the isolators load (from on frequency signal) is lost in heat and never reaches the antenna.
With an isolator, if the duplexer is not presenting a pure 50 ohms (at the wanted frequency) to the output of the isolator you could put a wattmeter between the isolator and the isolator load and change cable lengths between duplexer and isolator or tune a Z matcher if you have one, for minimum power into the isolators load. That will give you maximum power to the antenna and you will have a near perfect 50 ohm load on the transmitter always. 73 Gary K4FMX _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, July 01, 2007 8:30 PM To: [email protected] Subject: Re: [Repeater-Builder] Cable formula Doesn't the isolator typically installed at the transmitter output spin off any anything reflected from the duplexer (or the feedline) into it's load? In a message dated 7/1/2007 5:33:33 P.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: But at some off frequency that is not 50+j0 that impedance is going to get transformed into something yet again by the time the cable reaches the transmitter. _____ See what's free at AOL.com <http://www.aol.com?ncid=AOLAOF00020000000503> .
