Hmmmm-- what about the case where your single shielded cable runs past a high power paging antenna, or your own repeater tx antenna? Seems that leakage INTO your receive antenna coax could be a consideration here.
About RG213, I've witnessed desense in a duplex situation when using this cable while it is being flexed..... Bottom line-- using solid shield coax is almost never a bad choice. Laryn K8TVZ --- In [email protected], Dan Hancock <[EMAIL PROTECTED]> wrote: > Why do you believe that double shielded cable is > necessary for an antenna run? What are you trying to > keep the signal out of? > Inter-cabling within the cabinet needs to be double > shielded to prevent interaction between the TX and RX > portions, but once those signals are merged at the > output of the duplexer they are both on the same > feedline anyway and double shielding is expensive and > unnecessary. > For short antenns runs, RG213 is actually an excellent > choice. > The only exception to this is if there is no duplexer > being used and the repeater is operating on split > antennas with parallel feedline runs, then 100% > shielding is necessary. Under these circumstances > LDM400 or 9913 would be a good choice if heliax is not > available affordably since the cables are not being > used in a duplex setting. > > Dan N8DJP > > > > Date: Tue, 11 Nov 2003 15:38:12 -0500 > From: Jim <[EMAIL PROTECTED]> > Subject: Re: Static / desense problems > > Gene Colson wrote: > > > And I am going to once again proclaim that with > proper > connectors, LMR 400 > > is as good as it gets.No more noisy that RG213. I am > > using it on 900 , 440 > > and VHF duplexers and assure you , there are no > problems, > > Gene W7UVH > > > > Of course not-RG213 is unsuitable for duplex as well, > as it > is NOT > double shielded!!! Or do you mean RG-214, which IS > double-shielded? > And Andrews LDFwhatever-50 is as good as it gets for > feedline for ANY > application!!!!! (well, maybe a few exceptions, like > if you > need > radiating feedline, or plenum-rated...) > > -- > Jim > > > __________________________________ > Do you Yahoo!? > Protect your identity with Yahoo! Mail AddressGuard > http://antispam.yahoo.com/whatsnewfree Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
