The unit consists of four broadband radiating elements mounted equidistant from a central mast and equally spaced from each other. They are fed inphase through an integral corporate feed-system to produce omnidirectional azimuth coverage.
The feed-system, consisting of coaxial transmission lines and impedance matching sections is enclosed and sealed within an aluminum framework. The array is fed from a single 50 ohm input connector. It handles average RF powers to 1 kW, with an input VSWR of 1.8:1 or less over the entire operating band.
The standard antenna configuration is intended for use on masts ranging from 4 to 11 inches in diameter. It is fabricated in two sections, using weatherproof, breakaway flanges, for simple, rapid installation. Mounting adapters (CA-3230 Series) are available to meet customer’s specific mast requirements.
Modification Kit, Model CA-3260, is also available for special applications where the mast diameter exceeds 11 inches. This kit, which increases the separation between the two antenna sections, is useful for mast diameters ranging from 11 to 15 inches.
Prime consideration has been given to providing a rugged, weatherproof, high-performance antenna capable of prolonged operation in severe shipboard environments. The inherent design provides a high capacity drain path to ground for lightning protection and to prevent static charge buildup. A balun feed system and isolation traps limit RF current flow on the central mast, preserving optimum pattern characteristics.
CA-3018 has been fully qualified to meet MIL-S-901C for Grade A Shock; MIL-S-167, Type I Vibration; and the Service Conditions of MIL-E-16400F for Class 2 equipment.
