Category – Airframe Parts – Antennas

The DM N4-7 VOR/LOC navigation antenna is a true center-fed balanced loop antenna with a high sensitivity and low bearing errors. The N4-7 system consists of two center-fed half-loops and a cable which enables a closed loop current flow allowing for improved signal to noise ratio and higher cross-polarized signal rejection. These rugged antennas have proven reliable service on aircraft such as Lockheed Jet-star, P-3A, and C-141 Starlifter, Bell UH1B helicopter, Sikorsky H34 helicopter, Convair 340, Aero Commander, North American Sabreliner, Douglas DC-3, Beech King Air and many other corporate and commercial aircraft.

The DM N4-17 VOR/LOC/Glide slope antenna is designed for general aviation, commercial, and military aircraft that operate up to Mach 1.0. DM N4-17 is designed to provide a low-cost, lightweight, and low-drag antenna for state-of-the-art avionics. This antenna's performance parameters exceeds environmental specifications of MIL-5400 Class 3 equipment; therefore, it can be installed on single engine to jet engine aircraft. The balanced loop design of the DM N4-17/N assures an omnidirectional radiation pattern at the horizon to obtain maximum signal for VOR and area navigation which provides more receiving distance and reliable system performance.

The DM N27 marker beacon antenna features a rugged and lightweight design for receiving 75 MHz marker beacon signals. The DM N27 antenna has a low-drag design that is simple to install. Mounting to the aircraft does not require a any cutting of airframe structural members. Its dielectric foam filled, polyester-fiberglass radome offers resistance excellence resistance to moisture and Skydrol while the metal leading edges offer erosion protection.

The DM C50-17 VHF antenna features a design that provides enhanced corona threshold, corrosion protection, and drag resistance. The C50 series provides a lightweight and strong blade antenna at a lower cost for current commercial jet aircraft. The C50-17 antenna is chosen as original equipment for the Boeing 757, 767, and 777 aircraft, and can also be used on the Boeing 707, 727 737, 747; Douglas DC-8, DC-9, DC-10; Airbus A300 series and other aircraft.

The DM N4-4 navigation antenna is a true center-fed antenna which minimizes bearing errors when receiving VOR and ILS signals. The N4-4  provides considerably more gain at the horizon than fuselage mounted ""deer horn"" or ""vee"" antennas. Improved signal to noise ratio and reduced errors is due to the N4-4 greater discrimination against vertically polarized signals, and when properly installed on helicopters greater rotor modulation rejection is also provided. To obtain maximum performance, the installation location must be carefully considered.