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Instructions:

INTRODUCTION

The construction instructions and dimensions contained in this Manual are intended

primarily for use with the basic SKYMASTER QUAD KIT. The design data and dimensions

can, however, also be used with other quad support structures.

There are two basic design concepts for the Quad with respect to the method of

determining reflector and driven element lengths. One method provides for making both

the reflector and director element(s) physically equal to the driven element. In this case

they are electrically lengthened or shortened through the use of stubs or inductors. The

other method calls for a determination of the proper physical length of the elements (usually

plus and minus 3% respectively) prior to cutting them. This manual will present data for

both methods but a choice should naturally be made prior to measuring and cutting the re-

flector and (if used) the directors as the case may be. A choice should also be made

regarding the orientation of the element assemblies themselves with respect to ground, i.e.

a diamond or a square configuration. (The Square configuration is recommended, and the

data presented is in reference that orientation).

The book Cubical Quads Antennas by William Orr and Stuart Cowan is also an excellent

source of dimensions and information about quad antennas and is a great addition to your

library. This book is available at most amateur radio stores.

Some Quad "experts" feel that the square position results in a slightly higher forward gain.

While others favor the diamond configuration, because it offers a convenient anchor point

for the element termination, as well as a support for the feedlines in routing them up to the

boom. The physical dimensions given in this manual can be used for either configuration,

note however it is not possible to use a single feed point or the matching transformer in the

Diamond configuration.

The SKYMASTER spreader arms are a three piece design and require assembly (Refer to

Assembly Drawing Attached). The three pieces of telescoping fiberglass tubing that when

completed will produce a robust spreader arm about 13 feet long (4m). Each arm is

identical in its assembly and construction regardless of the function, Reflector, Driven or

Directors. However the holes for the element wires are unique and those dimensions must

be carefully measured and positioned per the drilling chart found later in these instructions.

48"

Base

Butt end

1. The spreader arms may now be drilled for the element wires using a 3/32 inch

Reinforcement – pre-

installed at factory

(2.38mm) drill bit (or other size suitable for wire being used). Naturally the 3 holes in

each arm should be drilled in the same plane. The spreader arm drilling data maybe

Cubex Co., Inc.

ASSEMBLING SPREADER ARMS

Extension

Drill 3/16" hole through both

15"

pieces 1" from end

82"

13'-0"

Pg. 2

Cubex SkyMaster Series

48"

Tip

05-06 Rev 0