Remember that the RF field flows *around* the conductor in addition to the RF current *in* the conductor. Having wires of different lengths in close proximity means that the RF field will tend to act as though the conductor simply changes its thickness rather than being two conductors of different lengths.
The old "rule of thumb" in the ARRL books was to be sure the last "several feet" of each wire is well separated from the others. 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Friday, March 10, 2017 6:45 PM To: stan levandowski; Elecraft@mailman.qth.net Subject: Re: [Elecraft] (OT) - portable radial idea? Stan, It can be made to work, but will be a real "bear" to adjust to resonance unless you separate the ends. If you are feeding with 300 ohm twinlead, why not make a 66 foot long center fed dipole out of it. Alternately if this is for portable work, us no feedline at all - just a BNC to binding post adapter at the KX1. Use 2 lengths of wire as is shown on page 10 of the KXAT1 manual. 73, Don W3FPR On 3/10/2017 7:14 PM, stan levandowski wrote: > I found the plans (June 2010 Elecraft Reflector) to build a 40/30/20 > meter "linear loaded" portable antenna for my KX1 (using a crappie > rod, > 300 ohm twinlead for the radiator, a BL2 balun, and ribbon cable > radials cut to 1/4 wavelength for each of the bands (16, 25 and 33 feet). > > My question is how terrible would it be to use a piece of that thin > computer ribbon cable cut to the three lengths but NOT separated? > This would make it easier to deploy and roll back up. > > Has anyone ever tried using unseparated ribbon cable counterpoises? > The materials are on order and I'm sort of anxious to know. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r...@elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
