Fw: Re: Fw: Re: [Antennas] More Ladder Lines and Beams
Don Havlicek
[email protected]
2002年1月27日 12:59:19 -0500
If you want a 'balance' to ground, then it requires 'splitting' the AB
winding into two windings, each with 1/2 the turns as below:
c---- A
c winding #1 [1/2 the turns]
c---- B
c---- C
c
c winding #2
c
c---- D
c---- E
c
c winding #3
c
c---- F
c---- G
c winding #4 [1/2 the turns]
c---- H
again: connect B to C, D to E, F to G, attach 450 ohm balanced load to
A and H, coax to either B/C or F/G with shield/ground to D/E ... voila!
9:1 ... balanced .. grounded midpoint of windings!
OH ... about those rocks .. my 'burying jig' simply plows right through
them .. [my 'blade' is 1/4" stainless steel .. not 1/8" aluminum] and I
put about 100# of weight on the 'bed' of the 'sled' .. have lots of
rocks here, too .. no problem.
Don
N8DE
Sandy and Kees Talen wrote:
>> >Why do you feel you have to 'dig a trench' ? I bury my coax with a
> >device that I built that I pull behind my garden tractor....
>> ...we have lots of rock right below the surface. You plant small trees
> with a pick and shovel. Most of the backyard was built by bringing
> dirt in.
>> toroid windings.......
>> c---- A
> c
> c winding #1
> c
> c---- B
> c---- C
> c
> c winding #2
> c
> c---- D
> c---- E
> c
> c winding #3
> c
> c---- F
>> Connect B to C, D to E ... 50-ohm coax to F, shield/ground to D/E ..
> 450-ohm balanced line to A and F.
> Voila!
>> ....I don't think that is balanced because one side is two windings
> from ground and the other is one winding away. The turns ratio is
> right (3x) for 9:1.
>> 73s Kees K5BCQ
>> - - -
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