[600MRG] ground

[D.J.J. Ring, Jr.]

Bill,

Larry sees no changes in feedpoint impedance because his ground
conductivity is naturally very poor.

You are exactly correct when you say if you had his dense large radial
field, the antenna would ignore whatever is on the other side ESPECIALLY
when it is very poor ground.

Poor ground and elevated ground systems eliminate earth ground variables.

W3BC FCC engineer Ben Wolf used an elevated ground plane on 7 MHz and would
be working very distant DX before sunset, I heard him do it while in the
middle North Atlantic at sea.

73

David
On Feb 7, 2015 12:10 PM, "Bill Cromwell" <wrcromwell at gmail.com> wrote:

> Hi Larry,
>
> On my mail client your post appears just after Rudy's post. This reply
> appears to be in part a response to his post.
>
> You may have missed the part about the trees. You definitely missed the
> part about his lot size. Your radials are each 100 feet long. The radial
> field then is a little over 200 feet. Can you see from simple arithmetic
> that is not going to work for those of us who have lots smaller than 200
> feet?
>
> If you have a dense, large radial field your antenna no doubt ignores
> whatever is on the other side. The rest of us make do with whatever we can
> get to work for us. I wonder how large the trees are on top of that basalt
> 30 inches down.
>
> Does this help?
>
> 73,
>
> Bill  KU8H
>
>
>
> On 02/07/2015 10:45 AM, Larry wrote:
>
>> OK, what am I missing here?
>>
>> My 630 meter vertical antenna system shows no measurable difference in
>> feed point impedance between bone dry dirt and soggy wet dirt.
>>
>> For that matter neither does my 160 meter vertical.
>>
>> My dirt is composed of volcanic ash, sand, and rock. The so called top
>> soil averages 30 inches deep over cliche and basalt. It is so bad during
>> summer that electric fences are no longer effective unless the pasture is
>> irrigated!
>>
>> The 160 vertical is over a radial system composed of 82x 100 foot
>> symmetrically positioned buried wires in a clear 1.5 acre area. I. E. no
>> trees, no towers, no houses, etc.
>>
>> The 630 meter vertical is over 16x 25 foot buried wires but the area is
>> more cluttered with nearby conductive objects like metal buildings and
>> towers.
>>
>> So can anybody tell me why I NEVER see variations in feedpoint impedance
>> due to ground changes on ANY vertical antenna system I have used?
>>
>> 73,
>>
>> Larry - W7IUV / WH2XGP
>>
>
>
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