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HT-25A
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Applications:
The HT-25A is a predominantly horizontally polarized, dual input antenna with a full 2 to 30 Mhz instantaneous bandwidth at each input. The antenna is formed using crossed fan-type sloping dipoles. A sectionalized mast is used to elevate the center to 21 feet. The mast also supports the unit that houses the hybrid and impedance matching devices. The antenna elements are made of vinyl coated galvanized cable to protect the elements from corrosive environments and to minimize high voltage hazards. Features: The HT-25A is a militarized, transportable HF antenna designed specifically for short range (0-300 miles) near vertical incident skywave circuits. The horizontal polarization permits operation over all soil types without the need for a ground screen. A hybrid feed provides two isolated broadband RF inputs suitable for receive and/or transmit applications up to 1 kW average power. Additionally, the two crossed dipoles provide polarization diversity for receiving. This lightweight antenna is rugged and easy to erect. The antenna may be erected by two men in less than one hour. The elements are stored on winder boards that contain the terminations, the permanently attached guys, grounding wires and interconnects. Equipment Supplied: The antenna comes equipped with radiating elements containing terminations, a dual input hybrid, a sectional mast, guys, a pivot base, anchors, ground rods, hammer, two transit cases, and two coaxial cables that provide interface connectors at the bottom of the mast. Optional Equipment: A crank-up or pneumatic telescoping mast, foot pump and electric compressor. |
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| Frequency Range | 2 to 30 MHz |
| VSWR, 2 to 5 MHz | 2.3:1 Max |
| VSWR, 5 to 30 MHz | 2.0:1 Max |
| Impedance | 50 Ohms Unbalanced |
| Power | 1 KW Average / PEP |
| Input Connectors | Type N |
| Polarization | Horizontal and Vertical |
| Isolation | 40 dB Typical, 22 dB Minimum |
| Gain, 2 to 30 MHz | -3.2 dBi Minimum, 0 dBi Average |
| Azimuth Patterns, 2 to 16 MHz | +/- 1.0 dB Omni |
| Azimuth Patterns, 16 to 30 MHz | +/- 2.4 dB Omni |
| Elevation Patterns, Below 8 MHz | Gain Max at Zenith |
| Elevation Patterns, Above 8 MHz | Not lower than 20 degrees |
| Deployed Size | 260 Ft. diameter |
| Stowed Size, #1 Transit Frame, Inches | 38L x 15W x 13.62H |
| Stowed Size, #2 Transit Frame, Inches | 76L x 15W x 13.62H |
| Weight | 200 Pounds |
| Finish | MIL-P-53039, Green 383 Carc Paint |
| Wind Without Ice | 86 MPH Operational |
| Snow and Ice | 115 MPH Survival |
| Altitude, Operation/Storage, Feet | 12000/40000 |
| Solar Loading | 360 BTU/HR/FT2 AT +650C |
| Fungus | MIL-STD-810, Method 508.3 |
| Vibration | MIL-STD-810, Procedure I |
| Shock, Stowed | 33g, 33ms, ½ sine |
| Send | MIL-STD-810, Method 510.2, Procedure II |
| Rain | 4 IN/HR, 40 MPH Winds |
| Temperature, Storage | -62C to 71C |
| Temperature, Operation | -54C to 65C |
| Humidity | MIL-STD-810, Procedure III |
| Salt Fog | MIL-STD-810, Method 509.2, Procedure I |
