[Antennas] " G5RV " TYPE ANTENNA / "CUSHCRAFT MA5V" ANTENNA QUESTIONS

[K6MHE]

Criss,

The 2=BD to 3 times has been around longer than I. However, if you can=20
picture in you mind the magnetic lines of force surrounding a conductor=20
where current is present and then place two conductors side by side spaced=
=20
very close with current flow one way in one and the opposite way in the=20
other you should be able to picture in your mind's eye lines of force an=20
choking one another off. (One going is clockwise direction and the other=20
counterclockwise) Nothing expands very far as they've beaten each other=20
down to almost nothing. A little like Dr. Doolittle's pushme/pullme <grin>.

Not very scientific explanation, but how I've pictured it for years.

I'll stand by and hope George will jump in with a better (and more correct)=
=20
answer.

73
Danny, K6MHE


At 05:45 PM 7/1/2002 -0700, you wrote:
>I think that this is a good point of discussion.
>
>I have read that the spacing should be about 3 times the spacing of the=20
>ladder line.  BUT I have also read that the spacing should be so much of a=
=20
>wave length.  Does anyone know how this spacings were developed?
>
>Chris opr VE7HCB
>
>
>At 05:52 PM 2002-06-30 -0700, K6MHE wrote:
>>At 05:22 PM 6/30/2002 -0700, you wrote:
>>>As far as the G5RV, I would recommend the following:
>>>
>>>[snip]
>>>
>>>3.  The ladder line should be spaced away from the
>>>tower, and any other metal objects, about 15 feet.
>>>This is easily accomplished by strapping a piece of
>>>PVC pipe to the tower.
>>
>>That would be true if the ladder line's conductors had a spacing of 5=
 feet!
>>
>>Ladder line should be keep away from conductive surfaces a distance equal=
=20
>>to 2=BD to 3 times the spacing of the parallel conductors. In other words=
=20
>>the popular plastic window line in which the wires are spaced 0.8 of an=20
>>inch; the spacing should be greater than 2 to 2=BD inches. Great=
 distances,=20
>>of course, won't hurt but are unnecessary.
>>
>>Danny, K6MHE
>>
>>
>>- - -
>>Your moderator for this list is:
>>Larry Wilson KE1HZ antennas-owner@mailman.qth.net
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>
>