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VOBA-III |
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Applications:
The VOBA-III antenna is suitable for skywave propagation from medium to long range circuits. This antenna design can be used for short range groundwave circuits up to approximately 100 miles, and is well suited for naval shore-to-ship communication. Features: The antenna is ruggedly designed and will withstand harsh environments such as high wind, ice, and snow. The broadband frequency capability does not require tuning. Characteristics: The antenna is designed in accordance with the U.S. Navy specifications MIL-A-28768B (EC) and MIL-A-28768/1B (EC). The antenna is a fixed station antenna which covers various frequency bands without requiring any frequency tunings or frequency adjustments. Equipment Supplied: Prefabricated alumoweld curtain, galvanized steel tower with built-in ladder, safety climbing equipment, guys, base insulator, embedment hardware, ground screen, antenna matching unit, and spare hardware. Optional Equipment: Repair kit, repair tool kit, and erection kit. Coaxial cable, connector adapters and mating adapters. |
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| Gain | 2 dBi Between 0 and 15 Degrees above the Horizon |
| Input Impedance | 50 Ohms Unbalanced |
| VSWR | 2:1 Maximum |
| Polarization | Vertical |
| Azimuth Pattern | Omnidirectional +/- dB |
| Power | 25 kW avg/50 kW PEP, 100 kW Peak Instantaneous |
| Input Connector | 3-1/8" EIA Flange |
| Environmental Conditions |
125 MPH Wind, no ice 90 MPH Wind, 1/2 Inch radial ice |
| Frequency Range | 3-30 MHz |
| Height (H) | 61.5 Feet |
| Diameter (D) | 315 Feet |
| Ground Screen Radius | 82 Feet |
| Shipping Weight (LBS) | 5, 287 |
| Shipping Volume (Cu. Ft.) | 418 |