ISO 9001:2015 and AS9100D Certified
Serving the Aviation Industry since 1973
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DMN25-1
Glide Slope Antenna
Frequency 329-335.3 MHz
(DAI Part# DMN25-1)
The DMN25 series of glide slope antennas employ a grounded, center-fed loop as the radiating element. The resulting radiation patterns are symmetrical. The DMN25-2 is a dual connector version which incorporates a hybrid. This circuitry effectively isolates the two associated receiving systems providing protection against disablement of both systems in the event of failure in one system. The radiation pattern associated with each DMN25-2 antenna port is identical, so that no coupler drop-out problem during automatic landing occurs.

All DMN25 series antennas provide complete lightning protection for the associated receivers. They are suitable for mounting either externally, or within a nose radome. The inherent 180° pattern beam may be modified slightly by the geometry surrounding the installation. The DMN25 antennas are recommended for installations in close proximity to radar dish installations since the antenna's (glide slope) sensitivity is relatively unaffected by dish motion.

SPECIFICATIONS
Electrical
Frequency 329 to 335.3 MHz
VSWR 5:1 DMN25-1
3:1 DMN25-2
3:1 DMN25-3 (AT-983)
Gain 0 dB
Impedance 50 OHMS
Polarization Horizontal
Mechanical
Weight (0.23 Kg) 8 oz. DMN25-1
(0.39 Kg) 14 oz. DMN25-2
Connectors (0.23 Kg) 8 oz. DMN25-3 ( AT-983)
TNC (female) DMN25-1
C (female) DMN25-2
N (female) pressurized
Type of Construction All aluminum with dielectric sealed feed point.
Military Qualified for vibration, humidity, temperature-altitude shock & salt spray per MIL-T-5422E
FAA TSO C35b
Harris (D&M/EDO)
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