The DM N4-4 navigation antenna systemhas been designed to minimize bearing errors when receiving VOR and ILS signals. It provides increased gain at the horizon, particularly during banks, than fuselage mounted “deer horn” or “vee” antennas. It can discriminates against vertically polarized signals, and when properly installed on helicopters, it rejects rotor modulation which results in better signal to noise ratios with less errors. Constructed from magnesium tubing, this antenna is lightweight and rugged, and ideal for use on light planes and helicopters.
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规格：
Weight:
2 lb, without cable
Connector:
BNC
Mounting:
on opposite vertical surfaces of the aircraft
Frequency Response:
108 MHz to 122 MHz
VSWR:
<5.0:1
Gain:
0 ±2dB
Impedance:
50Ω
Polarization Pattern:
Omnidirectional in the azimuth plane. Approximately cos. q in the vertical plane
Efficiency:
95%
Power Handling:
Receive Only
Environmental:
Military: MIL-E-5400, MIL-T-5422
FAA: TSO-C40a
特征：
Designed to minimize bearing errors when receiving VOR and ILS signals
Provides increased gain at the horizon, particularly during banks
Discriminates against vertically polarized signals
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