HT-30
2-30 MHz Tactical Antenna  


The HT-30 3 to 30 MHz antenna is used for short and medium range skywave propagation circuits. It is designed to handle 14 kW transmitters. The antenna is designed for field operations where transportability is essential and erection and disassembly must be accomplished in a minimum time by a minimum number of personnel. The equipment is stored in transportable two-man carry containers. The antenna consists of two orthogonal broadband dipole elements supported by a 30 ft. telescoping mast at the center of the structure. The elements slope radially outward and toward the ground. Each element is made of five phosphor-bronze wires in a fan shaped configuration that terminate to a resistive load to ground. The telescopic mast is pneumatically operated and is designed for rapid deployment of tactical antennas. It is a PM-456 mast that is modified to provide a 30 foot erection height for the antenna matching unit (AMU). The AMU consists of four identical RF units that match the fan dipole elements to 50 ohms.

The elements are fed using a broadband quadrature hybrid which enables the antenna to radiate either right-hand circular or left-hand circular polarization. The hybrid locate at ground level near the base of the mast. The hybrid outputs connect to the AMU by means of four RG-393 coaxial transmission lines

Photographs

 Specifications

 Performance
 Frequency Range

 3 To 30 MHz
 Polarization

Right-Hand Circular Or  Left-Hand Circular
 Input Impedance

 50 Ohms
 VSWR

 2:1 Maximum
 Power

 14 kW Average
 Communications Range

 Short to Medium Range Skywave
 Number of RF Inputs

 2
 Operation Modes

 Transmit
 Gain, 3-4 MHz, dBi

 -4 dBi Minimum
 Gain, 4-30 MHz, dBi

 0 dBi Minimum
 Azimuth Pattern, 3-15 MHz

 Omni +/- 1.5 dB
 Azimuth Patterns, 16-30 MHz

 Omni +/- 3.0 dB
 Elevation Patterns, Below 8 MHz

 Beam Max At The Zenith
 Elevation Patterns, Above 8 MHz

 Beam Max No Lower Than 12 Degrees Above The Horizon
 Height, feet

 30 Feet
 Radius, feet

 104 Feet
 Weight, pounds

 700 Pounds
 Installation Time

2 Technicians 90 Minutes Not Including Anchors 
 Disassembly Time

 2 Technicians, 2 Hours
 Storage Temperature Range

 -40 Degrees F to 160 Degrees F
 Operational Temperature Range

 -22 Degrees F to 155 Degrees F
 Rain

Mil-Std-810 Method 506.2, Procedure I, 6.6 Inches/Hour
 Relative Humidity

 Up to 100%
 Wind and Ice

 90 MPH, No Ice
 Snow

 40 PSF
 Salt Fog

 Mil-Std-810 Method 509.2, Procedure I
 Altitude

 Up To 40,000 feet
 Solar Radiation

 Mil-Std-810 Method 505.2, Procedure II
 Fungus

Mil-Std-810 Method 508.3
 Vibration, Packed

Mil-Std-810 Method 514.3, Procedure II
 Shock, Packed

Mil-Std-810 Method 516.3, Procedure II 
 Sand and Dust

 Mil-Std-810 Method 510.2, Procedure II
 Lightning

 All Housings And Dipole Elements Have A DC Path To ground