[TowerTalk] Fw: Fw: Why radials improve radiation!

[Al Williams]

----- Original Message ----- 
From: "Al Williams" <alwilliams at olywa.net>
To: "WA8JXM" <wa8jxm at gmail.com>
Sent: Monday, May 23, 2011 9:43 AM
Subject: Re: [TowerTalk] Fw: Why radials improve radiation!


> No, it doesn't help me understand because it just rephrases what I tried 
> to say in 2b of my question.
>
> In case of the dipole, if the two sides are of equal length then it would 
> seem there is a place for the charge and discharge to be identical. 
> However if the feedpoint is moved off-center the radiation according to 
> EZNEC remains the same. Where is the current to charge/discharge the 
> shorter side (to make up for the shorter wire) going?
>
> k7puc
>
>
> ----- Original Message ----- 
> From: "WA8JXM" <wa8jxm at gmail.com>
> To: "Al Williams" <alwilliams at olywa.net>
> Sent: Monday, May 23, 2011 9:26 AM
> Subject: Re: [TowerTalk] Fw: Why radials improve radiation!
>
>
> I don't know if this will help or not, but I'll try (at least according to 
> my thinking):
>
> If you take a light bulb and run one wire to it from a battery, obviously 
> the bulb will not light up.   Why?  because there is no place for current 
> to go to.
>
> Likewise with an antenna.  If you only have one connection (the center 
> conductor), where will the current flow to?   It needs either another 
> element (such as the second side of a dipole), or a ground connection . 
> Then you have two wires to accept your power.
>
> A good set of radials provides a good place for the rest of the circuit to 
> send it's current.
>
> Does that help any?
>
> Ken WA8JXM
>
> On May 23, 2011, at 11:55 AM, Al Williams wrote:
>
>>
>> ----- Original Message ----- 
>> From: Al Williams
>> To: SteppIR at yahoogroups.com
>> Sent: Wednesday, May 18, 2011 8:23 AM
>> Subject: Why radials improve radiation!
>>
>>
>> Help, Help!
>> There have been many, many postings on how to set up the radials but 
>> never a discussion on why or how radials actually effect the radials as 
>> it seems to be "beyond the scope....".
>>
>> It is pretty easy to understand why from a circuit current loop viewpoint 
>> i.e. the transceiver power output is divided between the radiation 
>> resistance and the ground resistance (ignoring connector, coils, and wire 
>> resistance).
>>
>> 1. However the radiation resistance is a make-believe or psuedo 
>> resistance apparently derived from calculations of subtracting ground 
>> system power (system loop current x ground resistance)    from the 
>> transceiver power output. Thus, since the loop current is known and the 
>> remaining power is known, then the radiation resistance can be 
>> calculated?
>>
>> But his seems analagous to lifting oneself up by pulling up on ones 
>> bootsraps!
>>
>> 2a. For vertical antennas, it is said that there is no reflection 
>> (radiation) from the ground system.
>> It isn't very clear why, horizontal or vertical polarization or ?
>> 2b. It is also that radiation is a result of the changing state of the 
>> electrons in a material, caused by the changing current intensity. Thus 
>> the material is acting like a capacitor (charging and discharging as the 
>> current changes. For the material to charge/discharge there must be an 
>> opposite charge/discharge somewhere?
>> 2c. Is this "somewhere" the ground or the radials? Do the radials allow 
>> the antenna material to charge/discharge to greater amounts? Why and how?
>> 3. If 2c is true then "heating up the ground comments" hides what is 
>> really happening?
>>
>> help help
>>
>> k7puc
>