True, I expect, Carl. Just don't ground it! If you think about it, a more-or-less ideal "image - plane" for the vertical would be a circular metallic sheet a 1/2 wave in diameter ( although "infinite" extent would be better).
73, Charlie, K4OTV -----Original Message----- From: ZR [mailto:[email protected]] Sent: Saturday, January 25, 2014 4:43 PM To: Charlie Cunningham; 'Bob Eldridge'; [email protected] Subject: Re: Topband: Grounding the ends of radials OTOH connecting all the ends together with a wire that can handle the total current would help balance the field......Yes or no? Carl KM1H ----- Original Message ----- From: "Charlie Cunningham" <[email protected]> To: "'Bob Eldridge'" <[email protected]>; <[email protected]> Sent: Saturday, January 25, 2014 3:58 PM Subject: Re: Topband: Grounding the ends of radials >I generally agree with you, Bob - especially with regard to not grounding > the far ends of 1/4 wave radials!! After all what we are trying to > establish is a low-impedance "image plane" for the vertical radiator to be > fed against! A 1/4 wave wire, grounded at the far end would have a high > impedance to ground at the base, or feed-point, of the antenna! Makes no > sense! Would not result in a very favorable "driving-point impedance! > > 73, > Charlie, K4OTV > > > -----Original Message----- > From: Topband [mailto:[email protected]] On Behalf Of Bob > Eldridge > Sent: Saturday, January 25, 2014 3:46 PM > To: [email protected] > Subject: Topband: Grounding the ends of radials > >>I posted this on TowerTalk and I got a couple of responses as to why >>the ends of ground radials should not be grounded. > Isn't it dependent on whether you want the radials resonant or not? And > if you do want them resonant, on the length of the radial? > It doesn't make sense to ground the far end of a quarter wave radial if > you want a low impedance at the base of the antenna. It does make sense > if > you have short radials and want to intercept the "return current". > Bob VE7BS > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2014.0.4259 / Virus Database: 3681/7032 - Release Date: 01/25/14 > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
