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Part Number -- OE-418A(V)1/SRC |
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| Name: | HF Twin 18-Ft Whip Antenna System |
| Category: | HF Antennas |
| Photo(s): | OE-418A |
| NATO Stock Number (NSN): | 5985-01-383-8463 |
| Height: | 421 in ± 1 in (1069.3 cm ± 2.5 cm) (repeated below) |
| Frequency Range: | 4 MHz to 12 MHz (repeated below) |
| Features: | * Power
handling to 10 KW * Minimum maintenance * Meets MIL-A-29519(EC) * High reliability * Shipboard applications * Broadband * Weatherproof |
| Description: | The
OE-418A(V)1/SRC antenna group is a twin-whip antenna system which
provides broadband coverage in the 10-30 MHz frequency range for shipboard transmitting and receiving systems. The antenna system consists of
two 18 foot spun aluminum antennas, an impedance matching network
and an interconnecting wire-rope feed assembly. The system is intended for use on either the CG or DDG class naval vessels: - CG class vessel - the impedance matching network is CU-2241C/SRC and antenna is an AS-3770B/U - DDG class vessel - the matching network is CU-2416A/SRC with antenna AS-3773B/U The antennas used in the system are self supporting tapered aluminum tubes with a fibreglass insulator and mounting base. The impedance matching network contains a variable inductor/capacitor to enable optimal VSWR characteristics over the entire 10-30 MHz band. A VSWR of 3:1 or less on 50 Ohms can be achieved over the entire frequency band. The system has been qualified to MIL-S-901C for shock, MIL-STD-167 for Type 1 vibration, and all the service conditions of MIL-E-16400. |
| Notes: | 1.
NATO Stock Number 5985-01-383-8463. 2. Specifications subject to change without notice. |
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Electrical Characteristics |
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| Frequency Range: | 10 MHz to 30 MHz |
| Polarization: | Vertical |
| Power Handling: | 10 KW average |
| Azimuth
Coverage [Radiation Pattern]: |
Omni-directional |
| Impedance: | 50 Ohms |
| VSWR: | 3:1 maximum for typical installations |
| Input Connector: | 1-5/8 EIA flange (or customer order) |
| Output: | Bowl Insulator with 1/2 -13 UNC-2A Threaded Rod |
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Mechanical Characteristics |
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| Height / Length: |
AS-3773B/U - 218 in ± 1 in (554 cm ± 2.5 cm) AS-3770B/U - 218 in ± 1 in (554 cm ± 2.5 cm) |
| Weight: | AS-3773B/U
- 140 lbs ea (63.5 kg) AS-3770B/U - 78 lbs ea (31.5 kg) |
| Matching Network Enclosure: | GC
Class Ship Enclosure -- 28 in (71.1 cm) long, 20 in (50.8 cm) high,
28 in (71.1cm) wide, 110 lbs (49.8 kg) DDG Class Ship Enclosure -- 30 in (76.2 cm) long, 13 in (33 cm) high, 13 in (33 cm) wide, 80 lbs (36.2 kg) |
| Mounting (Each Antenna): | AS-3773B/U
- Base
flange with 8 holes, 0.690 in (1.75 cm) diameter, equally spaced on
a 10.750 in (27.30 cm) diameter bolt circle. AS-3770B/U - Base flange with 8 holes, 0.530 in (1.34 cm) diameter, equally spaced on a 7.25 in (18.4 cm) diameter bolt circle. |
| Mounting (Matching Network): | CG
Class Ship Enclosure -- Top flange welded to topside of
customer-furnished platform. DDG Class Ship Enclosure -- 6 mounting holes, 0.53 in (1.34 cm) diameter. |
| System Configuration: | CG
Class Ship Enclosure -- Antennas
spaced 96 in (243.8 cm) apart
DDG Class Ship Enclosure -- Antennas spaced 10 ft (3.04 m) apart |
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