Topband: Grounding the ends of radials

[Charlie Cunningham]

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:zr at jeremy.mv.com] 
Sent: Saturday, January 25, 2014 4:43 PM
To: Charlie Cunningham; 'Bob Eldridge'; topband at contesting.com
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" <charlie-cunningham at nc.rr.com>
To: "'Bob Eldridge'" <r.c.eldridge at ieee.org>; <topband at contesting.com>
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:topband-bounces at contesting.com] On Behalf Of Bob
> Eldridge
> Sent: Saturday, January 25, 2014 3:46 PM
> To: topband at contesting.com
> 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
>
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