[Antennas] Multiple dipole spacing

[David W Sher]

I have made several parallel dipoles, most recently a 40/80 using
ladder-line for the elements and a 20/40/80 with PVC tubing for spacing. 
It has been my experience that the latter arrangement suffers from
flipping over on itself in a wind, potentially shorting out elements if
you are using bare wire, unless you restrain the lower elements with
additional guys.  The ladder line parallel works fine.

Howevwer, why don't you save yourself grief by putting up a single dipole
fed with open-wire or ladder-line, with a tuner at the transmitter end. 
I found this a better deal all around.

Dave          W9LYA
What wrought doG hath?

On Mon, 12 Aug 2002 06:10:14 -0700 "R Goodspeed (W7DGX)"
<rollyg@earthlink.net> writes:
> Gentlemen,
> 
> I want to build a multiple dipole arrangement with one single feed
> point, and the higher frequency dipoles hanging below the lowest
> frequency dipole. The desired bands are 20 meters, 17 meters, 12 
> meters,
> and 10 meters.
> 
> What separation spacing is required to assure no flashover or 
> melting
> will occur using legal limit power. Is PVC pipe good enough to be 
> the
> spreaders to maintain the dipole separation spacing. Ten foot 
> lengths of
> schedule 40 pipe is $1.44. Are one or two feet separations 
> sufficient??
> 
> From my reading, the spacing must be greatest at the ends of the
> dipoles, because it is the highest voltage point. Is that true with 
> the
> other dipoles being connected at the same time???
> 
> How much interaction should I expect? How would that affect the 
> �normal�
> length of a dipole?
> 
> Present plans involve hanging the dipole ends from trees with a rope 
> and
> pulley arrangement that will allow lower the antennae for 
> adjustments
> (and repairs if needed).
> 
> Thanks for reading this.
> 
> Thanks for any information you folks may provide.
> 
>            Rolly W7DGX
> 
> 
> - - - 
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ antennas-owner@mailman.qth.net
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