[TowerTalk] How Helically Wound Verticals Really Work (was : Vertical dipoles)

[Gene Fuller]

"Smart" is good, but remember "there's no free lunch"
Gene / W2LU


----- Original Message ----- 
From: "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net>
Cc: <towertalk at contesting.com>
Sent: Thursday, November 19, 2009 10:55 PM
Subject: Re: [TowerTalk] How Helically Wound Verticals Really Work (was : 
Vertical dipoles)


>
>
> Rick Karlquist wrote:
>> Roger (K8RI) wrote:
>>
>>>> But a center loaded vertical has a high profile, high wind drag, and is
>>>>
>>> more fragile than the helically wound vertical.
>>>
>>
>> This is a straw man argument.
> Hardly. I'm comparing a lumped inductance in the center to turning the
> entire antenna (or most of it) into one long linear loaded antenna.
>>   You are comparing a 1 1/2 inch diameter
>> HWV with a center loaded vertical using, say, a "bugcatcher" type coil.
>>
>>
> Yes, that's what center loaded does to get the required inductance. Now
> you could make the coil increasingly smaller and longer, but you'd
> eventually end up with the helically wound antenna.
>> Suppose the center loading "coil" is constructed just like the
>> "helical" windings,
>>
> Then it becomes a helically wound antenna. The smaller you make the
> diameter the longer it has to be.
>
>
> 73
>
> Roger (K8RI)
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