Alaris Antennas manufactures Naval rated monitoring antennas. There are two approaches: Omni directional (OMNI-A0205) vs rotating high gain directional antennas (SYST-A0005).
This vertically polarised omni-directional antenna consists of an active antenna array, covering 20 to 6000 MHz. The antennas are combined under 1 compact radome and output in either a single (OMNI-A0205-01) or two connectors (OMNI-A0205-02). The active part of the antenna protects the system from excessive field strengths and boosts low level signals.
The active version of this antenna relies on DC power injection on the output port of the antenna. The antenna is best utilised with the MISC-A0022 power supply for this purpose. The OMNI-A0205-01 features a passive-bypass mode which is engaged when the antenna is not powered. In this mode, the antenna is completely passive, allowing for low distortion measurements in the presence of high incident fields.
Based on the OMNI-A0098, the antenna is mechanically hardened to withstand the harsh environments experienced in maritime applications.
The SYST-A0005 is a shipborne rotatable antenna system used for wideband detection and monitoring of communication signals. It consists of two LPDA antennas fitted to a single vertical mast, mounted on a rotator. The rotator can be aimed at all angles and is controlled via software.
The LPDA-A0083 is a large LPDA for 30 to 1000 MHz and is mounted on top of the mast. The LPDA-A0084 is a small LPDA mounted at the base of the mast. The SYST-A0005 features low-loss internal cables, a rotary joint for unlimited continuous rotation and a protected cable exit system.
It is designed for shipboard use above deck and has been tested to withstand a 200 km/h wind speed. All components are stainless steel and aluminium for complete protection from salt. The antenna has ample power capability for immunity from nearby communications and jamming. The mast has an integrated fold-away hoisting boom to facilitate installation with a crane.
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