Jesse, You are correct and this is why some large coax have hollow tubing for the inter conductor. Due to skin effect the current density on the outer part of the conductor is higher.
But if a coax has 10 watts with a said current at one freq and the same current at a higher freq the losses will be different. This was my point. 73, ron, n9ee/r >From: Jesse Lloyd <[EMAIL PROTECTED]> >Date: 2007/08/26 Sun PM 02:34:41 CDT >To: Repeater-Builder@yahoogroups.com >Subject: Re: RE: [Repeater-Builder] Re: Duplexers > >I^2R losses do change with frequency because of the skin effect. > > > >On 8/26/07, Ron Wright <[EMAIL PROTECTED]> wrote: >Jeff, > >The low shield coverage is one reason I do not buy cables with pre-installed >connectors unless I know the cable...not just because it says RG8 or whatever. > >I used a piece of 50 ft RS RG8 w/pre-installed connectors for a few years and >finally cut it for other purposes and was so disappointed I had purchased such >a cable with so little shield. > >Guess works for CB and Ham HF bands, but really not good for VHF/UHF. The >same can be said for many PL259 connectors and adapters. > >73, ron, n9ee/r > >>From: Jeff DePolo <[EMAIL PROTECTED]> >>Date: 2007/08/26 Sun PM 12:59:45 CDT >>To: Repeater-Builder@yahoogroups.com >>Subject: RE: [Repeater-Builder] Re: Duplexers > >> >>Coax leakage is different than currents flowing on the shield though... >> >>I remember having some RG8 from Radio Shack with braid openings that you >>could probably fit a pencil through. >> >>> 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... >> >>You could run it up the tower and have a really long antenna. Lots of >>capture area ;-) >> >> > >Ron Wright, N9EE >727-376-6575 >MICRO COMPUTER CONCEPTS >Owner 146.64 repeater Tampa Bay, FL >No tone, all are welcome. > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
