Submarine Antenna Systems
Designs and manufactures communication and navigation antenna systems and equipment for submarines and aircraft
Provides a submarine with communication reception and transmission over a wide range of frequencies. The antenna can be erected above the seawater surface from its normal storage area within the submarine fin. Once clear of the water, communications in various bands, IFF transpond and GPS reception can be accomplished. The system consists of an Antenna/Radome, Mast Raising Equipment, Outboard Cable, Hull Penetrator, Junction Box, and Antenna Control Unit. The Outboard Cable, Hull Penetrator, and Junction Box provide connectivity between the Antenna/Radome and the Antenna Control Unit in radio. The Antenna Control Unit provides the interface point between the Antenna/Radome and the shipboard transceivers and transponders.
The ability to effectively copy VLF/LF broadcast, while submerged, has long been a requirement for submarines. The high performance, crossed-loop VLF/LF antennas needed to accomplish this have been designed and manufactured by Lockheed Martin Sippican for many years. Our antennas are military quality units designed to operate in the submarine environment and to interface directly with standard VLF/LF communication receivers. These antennas can be configured in varying sizes and shapes which makes for easy mounting to the submarine. All of the VLF/LF loop antennas offered by Spears/Sippican contain integral low noise preamplifiers are provided with an Antenna Coupler (located in the ship's radio room) which interfaces the active antenna to a standard 50 ohm receiver. Our systems are also offered with the Outboard Antenna Transmission Line, Hull Penetrator, and Inboard Antenna Transmission Line.
The Emergency HF Communication Antenna is used when the submarine's normal HF antenna systems are inoperable. The system consists of a manually erectable Antenna, an Antenna Base Unit, an RF Transmission Line, and a Hull Penetrator. The telescoping antenna is approximately 11 meters in length when fully extended and is capable of progressive adjustment and being locked to any desired length. The Antenna collapses to approximately two meters in length which allows for easy stowage inside the submarine when not in use. The Antenna Base Unit is a pressure-proof assembly that is permanently located outside the hull of the submarine in the vicinity of the bridge. This unit contains broadband matching networks which allow for direct connection of the ship's HF transceiver to the Antenna Base Unit, thereby eliminating the need for radio personnel to operate an antenna tuner. These broadband networks provide a match to the antenna such that the nominal SWR at the inboard end of the transmission line is less than 3:1. The Antenna Base Unit also houses integral electromagnetic pulse (EMP) and lightning surge protection and is totally compatible with the seawater environment.
Buoyant wires are long, towed antennas that provide a submarine with the ability to communicate while remaining deeply submerged. The system consists of a buoyant wire antenna, a reeling machine which deploys, tows, and retrieves the antenna, reeling machine controls, a transmit/receive switch, and an antenna coupler. When the submarine wishes to communicate, the buoyant wire antenna is deployed via the reeling machine which can be mounted either inboard or outboard of the pressure hull. A portion of the antenna floats at or near the sea surface and receives radio signals. An antenna that allows both transmit and receive in the HF band is also available. Signals received on the Buoyant Wire Antenna are filtered and amplified in the Antenna Coupler located in the radio room. This coupler is a broadband device that provides the interface between the special antenna and the standard submarine radio receivers. Because the system is broadband, it is LINK Eleven compatible.
Towed Communication Buoy Systems
Towed Communication Buoys have been employed by the major submarine navies of the western world for many years. These systems allow for maximum operational flexibility by placing minimal restrictions on ship's speed and depth while offering a wide range of communications capabilities. Today's towed buoys offer a stable platform that can be outfitted with communications antennas and electronics that will allow a wide range of frequency coverage. Non-communication type sensors can also be mounted in the buoy. Lockheed Martin Sippican manufactures all of the towed buoy systems used by the US Navy submarine fleet. We can offer several system configurations to suit any size and type of submarine and can offer a full range of communication/navigation capabilities.