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DMN4-4 Navigation Antenna System
Frequency 108-122 MHz
(DAI Part# DMN4-4)
The DMN4-4 Antenna System has been designed to minimize bearing errors in the reception of VOR and ILS signals. It provides considerably more gain at the horizon (particularly during banks) than do fuselage mounted "deerhorn" or "vee" antennas. It has substantially greater discrimination against vertically polarized signals; and when properly installed on helicopters, it provides much greater rejection of rotor modulation than can be obtained with these other antennas. As a result, it provides better signal to noise ratios and smaller errors than is otherwise available.

The DMN4-4 Antenna consists of two (approximately semicircular) center-fed half-loops and a cable harness. Because the DMN4-4 has been designed specifically for light planes and helicopters, lightweight rugged construction has been stressed. It is built of round magnesium tubing and weighs only 2 pounds.
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SPECIFICATIONS
Electrical
Frequency Range 108 to 122 MHz
VSWR < 5.0 to 1
Gain 0 ± 2 dB
Impedance 50 OHMS
Polariztion Horizontal
Efficiency 95%
Radiation Pattern Omnidirectional in the azimuth plane.
Approx. cos. Ø in the vertical plane.
Mechanical
Weight (without cable) 2 lbs.
Connectors BNC
Military MIL-E-5400
MIL-T-5422
FAA TSO-C40a
Harris (D&M/EDO)
Antennas, Couplers, Diplexers
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