[Elecraft] 80 Meter Verticals

[Bill Johnson]

Wes, thanks for posting this great reference.  Certainly turns a bunch of stuff I have read on its ear and will help with my antenna building underway.

73,
Bill
K9YEQ

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wes Stewart
Sent: Wednesday, March 1, 2017 10:18 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals

Now that I provided the succinct answer, allow me to provide an in-depth answer.

But rather than me doing it, I will take the easy way out and simply provide a link to the fine explanation done by Tom, W8JI:

https://www.w8ji.com/radiation_resistance.htm

Wes  N7WS


On 3/1/2017 7:27 AM, Wes Stewart wrote:
> No truth at all.
>
> On 3/1/2017 6:25 AM, Charlie T, K3ICH wrote:
>> Is there any truth in the theory of making the vertical radiator out 
>> of multiple wires such as ladder line and even adding a third wire 
>> woven through the ladder sections and fed on one wire?  The physical 
>> result is three parallel wires but electrically connected so as to form and "up, down and up
>> again" element.   This supposedly raises the radiating element impedance 
>> relative to the fixed ground loss resistance. The idea I'm told, is 
>> that since the ground resistance (loss) is fixed at whatever it is 
>> but as the actual radiating element impedance is raised, the antenna 
>> becomes more efficient since the ground loss percentage of the 
>> overall feed point impedance is lowered.  This impedance change 
>> happens in much the same way as a folded dipole feed is a higher 
>> impedance than a conventional dipole using a single wires.
>> I saw this written up a few years ago as a means of increasing the 
>> overall efficiency of an inverted L for either 160 of 80 M.
>>
>> I had an "L" made of the smaller ladder line on 160 with only four ¼λ 
>> radials on the ground that seemed to work fairly well. My plan was to 
>> install elevated radials, but that would have been a LOT of wire around the yard.
>> Something broke on it after a year or so, and I never re-installed it.
>>
>> 73, Charlie k3ICH

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