Aircraft Spruce Australia
Melbourne, VIC Australia
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DM N4-4 Antenna
MFR Model# DM N4-4
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Overview
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VOR/LOC BAL LOOP "TOWEL BAR" (DM N4-4) Frequency Range 108-122 MHz The DM N4-4 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 DM N4-4 Antenna consists of two (approximately semicircular) center-fed half-loops and cable harness. Because the DM N4-4 has been designed specifically for light planes and helicopters, lightweight rugged construction has been stressed. It is built of round magnesium tubing and weigs only 2 pounds. |
Specifications
- Frequency Range: 108 - 122 MHz
- VSWR: Less than 5.0 to 1
- Polarization: Horizontal
- Radiation Pattern: Omnidirectional in the azimuth plane.
- Approx cos. 0 in the vertical plane.
- Gain: 0 +/- 2 dB
- Impedance: 50 Ohms
- Efficiency: 95%
- Weight: (without cable) 2 lbs
- Military: MIL-E-5400
- MIL-T-5422
- FAA: TSO-C40a
- Connectors: BNC
Q&A
Please note, Aircraft Spruce Australia's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Australia assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Per supplier: We do not recommend painting of any of our antennas as it may affect the electrical performance of the antenna.
Unfortunately the manufacturer does not provide the gasket part # here.