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Instrument Landing System (ILS) Antennas

dBs 300A Glide Slope Antenna (P/N 300300-100)

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The dBs 300A is a premium performance Glide Slope (Path) Antenna. Built by dB Systems Inc. a worldwide leader in aircraft navigation antennas. Engineered and built on the legacy of all dBs products, this antenna delivers consistent phase stable RF signal in the world's most severe locations such as Cold Bay, Alaska. FAA approved and certified for use in all Instrument Landing Systems (ILS). Each antenna is phase matched and tested to meet the current FAA standards for low ceiling and limited visibility landings. It is the only glide slope antenna with a removable dipole channel assembly. This feature minimizes the need for adjustment following antenna replacement, as the corner reflector assembly can remain in place on the tower while the channel assembly is removed and replaced. When used with the appropriate transmitter system, the dBs 300A antenna transmits specially formed radio frequency (RF) beams in the frequency range of 328 to 336 MHz. Aircraft equipped with the proper airborne receiving equipment can follow the glide slope signal (provided by the dBs 300A) and can lock on and follow appropriate decent angle safely down to the runway.

The glide slope antenna assembly consists of three collinear dipoles mounted in front of a 90 degree corner reflector, which together form the shaped horizontal and vertical patterns of the antenna.

Radiating elements are heated to prevent ice formation and have 100% radome coverage to minimize environmental effects.

The assembly includes a temperature stabilized RF Distribution System as well as individual antenna element integral monitors and monitor combining device providing a single monitor output. The entire RF Distribution System as well as the integral monitor are constructed using low loss, phase stable, semi-rigid coaxial cable which provides less sensitivity to environmental changes.

The heater input is 240VAC using a MS-3102-22-9P circular mil connector interface.

The RF input (J1) and the monitor output (J2) connectors are both type "N" female receptacles.

Glide Slope Support Bracket (P/N 300500-100)

Optional Position Adjusting Mounting Bracket. Allows 18 inches of continuous adjustment of antenna physical position in vertical and horizontal axis.

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