Coax losses are mainly due to LC values. If just I^R then losses would be same for low and high frequencies. One finds little R in most coax although there are some and yes some losses due to it.
The losses of parrallel lines with small wire are much less due to much less C between the conductors due to much less surface area between the conductors. 73, ron, n9ee/r >From: Jesse Lloyd <[EMAIL PROTECTED]> >Date: 2007/08/26 Sun PM 01:08:49 CDT >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] Re: Duplexers > >Braided coax does radiate a little, there is no such thing as 100% braid. >Thats why in the cable TV industry they have to use double braided coax in the >headend, otherwise you can have a hell of a mess of stray RF in there. > >Coax loss is due to I^2R losses and radiation (and connector loss but thats >not really part of the cable). > > >On 8/26/07, skipp025 <[EMAIL PROTECTED]> wrote: >> "Jeff DePolo" <[EMAIL PROTECTED]> wrote: >> Line losses go up with VSWR, but coax doesn't radiate unless >> there are currents flowing on the shield, and those aren't >> a function of VSWR on the line. > >Wait a minute Jeff... what about that crappy low cost silver jacket >Super-flex Columbia branded coax I bought back in the 70's during >the CB boom... > >Some of the cheaper coax brands have less than about 70% shielding >making them pretty leaky to rf. It works just killer for adding a >little extra signal horse-power to a carrier current broadcast >station. Radiax without trying... > >:-) > >cheers, >skipp > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
