Yes Chuck, that is a better measurement, because the ARRL dipoles in their testing were probably? not the shortened fatter folded dipoles currently made commercially, which would increase the ideal space length to perhaps 0.5 wavelength end-to end.
The ARRL graph does show that it is better to err on the long side, but in practice the coax harness may be the limiting factor.
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John
On 03/09/2025 9:42 AM EDT Chuck Kelsey via groups.io <wb2edv@...> wrote:
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From the engineering section of an old Decibel catalog:
For optimum gain and performance, the centers of the antennas (radiator center) should be physically separated a given distance. This distance is not too critical but should be held to within 10%. For most vertically stacked arrays optimum spacing will occur around 0.85 to 0.95 wavelength as measured between centers.
Chuck
WB2EDV
On 3/8/2025 10:53 PM, Bob KK6RQ via groups.io wrote:
So it looks like nobody conclusively recognizes this array;? Can anybody offer any generic advice with regard to element spacing when it comes to an unknown 4-bay dipole array? The horizontal mast-element spacing is fixed; all I've got to work with is the vertical inter-element spacing.
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ps.? There's nothing on the phasing harness to ID what kind of coax it is, either.
