> -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Jeff DePolo > Sent: Sunday, July 01, 2007 10:51 PM > To: 'Jeff DePolo'; [email protected] > Subject: RE: [Repeater-Builder] Cable formula > > > You can't "convert" to a perfect 50 ohms using cable lengths > > if the load isn't already 50 ohms. I've said before, and I'm > > saying it again. If your duplexer 50 ohms load, you can pull > > all of the 50 ohm cables you want out of your bag and you'll > > never get it back to 50 ohms at the PA. > > Boy, I really butchered the English language on that one. It's late. > Rewritten: > > > You can't "convert" to a perfect 50 ohms using cable lengths > > if the load isn't already 50 ohms. I've said it before, and I'm > > saying it again. If your duplexer isn't a 50 ohm load, you can pull > > all of the 50 ohm cables you want out of your bag and you'll > > never get it back to 50 ohms at the PA. > > --- Jeff
Heh heh, I followed what you meant anyway Jeff. Yes I agree that you will never get it back to 50 ohms with a 50 ohm cable and I didn't mean to imply that you could although I guess that's what it sounded like as I wrote it. What I meant was that you can usually obtain some impedance that the transmitter likes better than what the duplexer might be supplying with a random length cable. Please note that most duplexer manufacturers recommend trying different cable lengths to cure the type of problems we have been discussing. 73 Gary K4FMX
