SHIPBOARD CA-3018, AS-1735/SRC OMNIDIRECTIONAL AROUND-THE-MAST ANTENNA Model CA-3018 is a high-power, broadband UHF antenna which provides vertically polarized, omnidirectional coverage over the 225 - 400 MHz frequency band. The unique design allows it to be installed on existing Navy ship masts without degrading its electrical performance. 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 adaptors (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 equipments. ELECTRICAL SPECIFICATIONS Frequency Range 225 - 400 MHz Polarization Vertical Impedance 50 Ohms VSWR 1.8:1 max Gain +2 dBi Azimuth Coverage Omnidirectional within 1 1/2 dB Zenith Coverage Figure - eight dipole pattern/ with MECHANICAL maximum at horizon Power Handling Capability 1 kW average Input Connector Type LC receptacle Weight 31 lbs Finish Grey Enamel All data contained herein is subject to change without notice. 1000-243 (M135) SHIPBOARD CA-3018, AS-1735/SRC OMNIDIRECTIONAL AROUND-THE-MAST ANTENNA OUTLINE DIMENSIONS Inches 29.50 4 ALUMINUM FLANGES, EACH WITH (4) 0.40" DIA HOLES FOR 0.37" BOLTS ON A 2.00" x 4.00" BOLT PATTERN 28.00 4 RADIATORS AIL Systems Inc. 455 Commack Road * Deer Park, NY 11729-4591 631-595-6000 Fax 631-595-6180 http://www.ail.com