The MAS-3 multiport antenna system is designed for installations where space is at a premium and the communication requirements is for several circuits simultaneously having a variety of path lengths. It provides five independent antenna modes. Two of these modes are NVIS modes for short range skywave circuits; two are low angle modes for medium range circuits; and the fifth mode is a high gain rotatable log periodic antenna for long range circuits. The relatively small installation area together with the five independent antenna ports makes the MAS-3 ideally suited for congested antenna fields or sites where space is severely limited.
The MAS-3 multiport antenna system combines the four omnidirectional port capability of the SPQ-330 with the rotatable log periodic array (RLPA) features of the LPH-1A to provide a truly five port antenna system occupying the space normally required for a single antenna. All five ports may be used independently for transmit or receive. The RLPA has high gain, azimuth selection and permits communication between a fixed site and mobile stations such as ships and aircraft. It also features a torque tube and base-located rotator thereby providing high reliability and easy accessibility for inspections and maintenance. The spiral is a four-arm equiangular design wound on a pyramidal structure formed by the center support tower and four catenaries. It is fed using an AP four-port hybrid as protected under US Patent 5189434.
Obstruction lights, erection kit, repair kit with winch, safety climbing equipment. Coaxial cable, connector adapters and mating adapters. Computer controller with RS-232 interface. A 230V 50Hz unit is also available.