[Antennas] Phasing Verticals

[Don Havlicek]

Ron,
There is quite a lengthy presentation on this subject in the last few
editions of the ARRL Antenna Handbook.  Using two verticals, spaced 1/4
wavelength and fed with proper phasing, produces the numbers you quote.
Remember, that means 1/4 wavelength FREE-space .. but the coax feedlines
MUST be 'cut' with respect to the velocity factor for the coax used.

I 'manufacture' phasing switchboxes for 3-element vertical arrays [one
'master' vertical, and two 'slave' verticals].  Placing one 'slave' NE
and the other SE of the 'master' allows for remote switching with the
'gain lobe' in one of four directions:  NE, SE, SW, NW.  From most
places in the USA, this covers the primary directions for DX.
These boxes come in 3 sizes:  QRP, 300 watt, and 3 Kw.  Prices and other
details are available upon request.

Contact me directly if you are interested.

Don N8DE

Ron W7MRR wrote:
> 
> Hi Friends (you too Irv):
> 
>    I would like to phase two verticals and have read several articles concerning the theory of operation as well as some engineering data put out by the old Hy-Gain company that was written in the 1970's.
> 
>    It would appear there are two commonly used phasing arrangements.  One uses a 1/2 wave spacing, provides endfire and broadside coverage and will result in 2 dBd and 3.6 dBd forward gain, respectively.  The other calls for 1/4 wave spacing, a narrower (carnoid) radiation pattern and 4.5 dBd forward gain.
> 
>    The one point that isn't enumerated, but seems obvious, is the relationship between spacing and forward gain.  Does anyone have a reference that they could share with me that doesn't require an advanced degree in Quantative, non-linear, advanced electrical engineering?
> 
>    Thanks for reading this and for any help you could offer.
> 
> Ron W7MRR
> 
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