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5100A-D/90° HPBW, Uni-Directional Antenna

5100A-D/90° HPBW, Uni-Directional Antenna

Part Number: 500300-101

The dBs 5100A-D is a uni-directional broadband, 10 element, higher performance, collinear dipole phased array designed specifically for use as a Distance Measuring Equipment (DME) antenna. It exhibits very low side lobe levels and negative angle radiation (minimizes multipath). The above-the-horizon null-filled pattern minimizes the radiated cone of silence. The antenna handles input power to 5,000 watts at the standard DME pulse duty cycle and operates over its entire frequency range with an input VSWR at 50 ohms of less than 2.5:1.

This antenna provides vertically polarized, uni-directional coverage with the main beam of radiation tilted upward to minimize the effects of ground reflections. The horizontal HPBW is a nominal 90°. The array has two integral monitor probes which constantly sample the RF signal delivered to the antenna.

The array is enclosed and effectively weatherproofed within a 6.25″ O.D. filament wound, ground smooth fiberglass radome for prolonged trouble-free use under severe environmental conditions. The uni-directional radiation pattern is produced by a full-length pattern shaping element within the radome. Mounting is made by means of an integral base flange with 6 each mounting bolt holes. All RF input/output ports are Type N receptacles.

Obstruction light power is fed through the array and a provision is made for mounting an obstruction light and/or lightning arrestor at the top of the array.

Lightning rod kit, obstruction light, pipe adapter (with or without cover), and plate adapter are available option items.

The model dBs 5100A-D DME antenna has been designed for ruggedness, lightweight, minimum size, long life, and in accordance with FAA-E-2754 and FAA-G-2100. Exceeds the requirements of the UK CAA specification.

dBs 5100A-D/90º with Marine Option: The dBs 5100A-D/90º Marine Version antenna is an optional upgrade from the base model. The RF transmission assembly is completely sealed and weatherproofed to protect in harsh environments such as salt water, extreme humidity, wind, sand, snow, and ice. Contact our factory for more details.

dB Systems Inc. offers DME repair and DME refurbishment at our facility. Contact us for a quotation.


Net Dimensions and Weight: 77.8” long, 6 1/4” O.D. radome, has top cap and base flange; 38 lbs.

Gross Dimensions and Weight: 82″ x 8″ x 8″; 51 lbs.


Inches is denoted by (“)

Outside Diameter is denoted by (O.D)

Pounds is denoted by (lbs)