MAS-2
2-30 MHz Multifunctional


Applications:
The MAS-2 multiport antenna system is designed for installations where space is at a premium and multiple communication circuits are needed. 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 make the MAS-2 ideally suited for congested antenna fields or sites where space is severely limited.
Features:
The MAS-2 multiport antenna system combines the four omnidirectional port capability of the SPQ-330 with the rotatable log periodic array (RLPA) features of the LPH-30 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 and 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 mounted rotator thereby providing 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 and is protected under US Patent 5189434.
Optional Equipment:
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.

Photos | Printable PDF File

SPECS. PORT 1 PORT 2 PORT 3 PORT 4 PORT 5
Application Short Range Medium Range Medium Range Short Range Long Range
Mode NVIS Low Angle Low Angle NVIS RLPA
Polarization Elliptical Vertical Horizontal Elliptical Horizontal
Frequency Range, MHz 2-30 MHz 4-30 MHz 4-30 MHz 2-30 MHz 6-30 MHz
Impedance, Ohms 50 50 50 50 50
VSWR 2:1 3.5:1 Max
2.5:1 Typical		 2:1 2:1 2:1
Directive Gain 7 dB 7 dB 7 dB 7 dB 12 dB
Input Power 10 kW 10 kW 10 kW 10 kW 10 kW
Input Connector 1-5/8 Inch EIA 1-5/8 Inch EIA 1-5/8 Inch EIA 1-5/8 Inch EIA 1-5/8 Inch EIA
Azimuth Patter Omni Omni Omni Omni Directional
Typical Isolation, dB 25 Typical 25 Typical 25 Typical 25 Typical 25 Typical
Dimensions Height 106 Feet; Length 100 Feet; Width 100 Feet
Wind 120 MPH, no ice; 80 MPH, 1/4 Inch ice
Temperature -60 Degrees Fahrenheit to + 160 Degrees Fahrenheit
Humidity 0 to 100 Percent
Elevation Sea Level to 12,000 Feet
Sand and Dust MIL-STD-810 Method 510.2 PRO II
Salt Fog MIL-STD-810 Method 509.2
Fungus MIL-STD-454K Req. 4
Rain 4 IN/HR., 40 MPH Winds
Lightning MIL-E-4158E
Corrosion Protection MIL-STD-454K