Jay, I am curious how long the LMR-400 (feed-line up the tower)has been in service?
mike -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Jay Urish Sent: Friday, January 06, 2006 11:52 AM To: [email protected] Subject: Re: [Repeater-Builder] Repeater Assistance in Michigan. Just as a point of reference, I have a UHF machine Moto MSF5000 pumping out 90watts going up 170 ft of LMR400 coax and I get great results. To make it more interesting, I have a comet duplexer at the feedpoint (in my station) so I can use the VHF part of the fiberglass dual band wonderstick as RX for my vhf repeater till I get a duplexer that will tune to 144.630(my DB duplexer wont) [EMAIL PROTECTED] wrote: > At 1/6/2006 01:34, you wrote: > >>Bob, >> >>Sorry if I didn't get it right but now I am really confused .... and open to >>learn. >> >><Snip and paste> >> >>>Shielding percentage of the antenna feedline has nothing to do with duplex >>>suitability. >> >>Somewhere I am missing something.... If shielding doesn't play a part in the >>suitability factor of selecting feedlines, why do we use hardline (other >>than less loss) or double shielded jumpers for connections etc.in a duplex >>operation? > > > Double-shielded jumpers are needed where isolation is needed between TX & > RX (duplexer jumpers & RX/TX connections to the duplexer). From the > duplexer antenna connector onward to the antenna, the TX & RX are already > combined. What's important there is linearity. RG-214 is double-shielded, > but it's also silver plated (or supposed to be, some '214-type' cable > isn't). Hardline has a solid outer conductor with no intermittent/point > contacts to generate IMD, so it's also extremely linear. > > Bob NO6B > > > > > > > > Yahoo! Groups Links > > > > > > > -- Jay Urish Systems Engineer Unixwolf Enterprises LLC. http://www.unixwolf.net 972.691.0125 972.965.6229 Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
