DME-1100-8-180

The DME-1100-8-180 is a professional-grade DME High Gain Directional Antenna System engineered for precision Distance Measuring Equipment applications in the 960–1240 MHz frequency band. Featuring a specialized 180-degree wide horizontal beamwidth, this antenna is designed to provide sectorized navigational coverage with an impressive 8 dBi gain. Built to handle extreme pulse power up to 5,000 Watts, the DME-1100-8-180 is the definitive choice for high-traffic aeronautical hubs and tactical navigation sites requiring ruggedized, all-weather directional performance.

Design: Precision Sectorized Navigation

The DME-1100-8-180 features a sophisticated center-fed collinear dipole phased array combined with a high-performance reflector. This innovative design eliminates radiation pattern distortion and ensures a true 180-degree directional horizontal pattern. By vertically stacking large-diameter brass elements fed in phase, the antenna achieves a 38-degree vertical beamwidth. This optimized aperture focuses RF energy exactly where needed for ground-to-air links, providing a constant 8 dBi gain across the entire broadband aeronautical navigation spectrum.

Construction: Engineered for Extreme Environments

Built for ultimate mechanical and electrical integrity, the DME-1100-8-180 utilizes fully welded internal junctions to prevent RF inter-modulation and ensure long-term signal purity. The radiating structure is completely protected within a high-tech ruggedized fiberglass radome specifically designed to control friction-induced static created by high-speed wind and dust. All exposed metallic components are treated with an epoxy-based powder coating, providing total protection against corrosive gases, salt spray, and acid rain in coastal or desert environments.

Reliability: Tactical Pulse Power & Monitoring

Designed for the demanding duty cycles of standard DME equipment, this antenna handles a massive 5,000 Watts of peak pulse power. It operates at D.C. ground, providing a low-resistance discharge path for lightning protection and immunity to electrical noise. For mission-critical sites, the antenna offers optional coupler and dual monitoring probes for real-time radiated signal feedback at -25 dB ± 1 dB. With marine-grade 316 stainless steel mounting hardware and full MIL-STD-810G compliance, the DME-1100-8-180 is a robust, maintenance-free solution for critical aviation infrastructure.

Technical Features

• Ultra-Wide 180° Horizontal Beamwidth: Optimized for sectorized navigation and broad directional coverage in the 960–1240 MHz band.
• Massive 5KW Pulse Power Capacity: Robust electrical design specifically rated for standard high-intensity DME pulse duty cycles.
• Friction Static Control: Advanced radome design dissipates static buildup from wind and dust to protect sensitive navigation electronics.
• MIL-STD-810G Compliant: Certified for extreme high/low temperatures, humidity, shock, vibration, rain, and salt fog.
• True Directional Phased Array: Center-fed architecture ensuring stable horizontal patterns without pattern "squint" or distortion.
• Fully Welded Internal Junctions: Eliminates passive inter-modulation (PIM) for cleaner signal transmission and pulse integrity.
• Optional Signal Monitoring: Available coupler and probes provide precise -25 dB signal feedback for automated health monitoring.
• Marine Grade 316 Stainless Steel: Supplied with high-quality hardware for maximum corrosion resistance in high-salinity coastal zones.
• Compact 0.5-Meter Profile: Extremely lightweight and low-profile design minimizes wind loading and simplifies tower installation.
• Integrated Lightning Protection: D.C. grounded design shunts atmospheric discharges safely through the high-strength aluminum structure

DME Sector Coverage Guide: Optimized Navigation with the DME-1100-8-180

In aeronautical navigation, particularly for Distance Measuring Equipment (DME), providing a broad but controlled signal is often more efficient than a full 360-degree omni-directional broadcast. The DME-1100-8-180 is engineered to provide a massive 180-degree horizontal beamwidth, making it the ideal "sector antenna" for specific geographical and tactical challenges.

1. Navigational Corridors and Coastal Links

Many DME stations are located on coastlines or at the edge of mountain ranges where providing a signal "behind" the tower is unnecessary or even counterproductive due to reflections.

• Focused 180° Energy: By concentrating all RF energy into the forward hemisphere, the DME-1100-8-180 provides an 8 dBi gain that reaches further into the flight corridor than a standard omni antenna of the same size.
• Coastal Efficiency: For shoreline installations, this antenna pushes the "Radio Horizon" further out to sea, ensuring that approaching aircraft lock onto the DME pulse pairs much earlier in their descent profile.

2. Managing the 5,000 Watt High-Power Pulse

DME systems operate using high-intensity pulse pairs. The ability to handle 5,000 Watts (5KW) of peak pulse power is a critical reliability factor.

• Thermal and Electrical Hardening: At 1 GHz frequencies, high power can cause internal arcing if the antenna junctions are not perfectly stable. The fully welded brass junctions of the DME-1100-8-180 ensure that these 5KW pulses are transmitted with zero internal "chatter" or PIM (Passive Inter-Modulation).
• Pulse Integrity: The center-fed phased array ensures that the pulse shape—the most critical part of a DME signal—remains sharp and undistorted, preventing timing errors that could lead to incorrect distance readouts in the cockpit.

3. Overcoming Static Interference in Arid Zones

DME receivers are highly sensitive to "impulse noise." In desert or high-wind environments, friction between air particles and the antenna radome creates static electricity (P-Static).

• Friction Static Control: The DME-1100-8-180 uses a high-tech radome designed to bleed off this static buildup. This ensures the antenna remains "electrically quiet," allowing the ground station to detect the weak return pulses from aircraft interrogators even during sandstorms or high-altitude wind events.

4. Redundant Monitoring for Safety-of-Life

For Category I/II navigation sites, the integrity of the radiated signal must be constantly verified by an internal monitor.

• The -25 dB Monitoring Probes: The optional dual probes act as "mini-receivers" inside the antenna's near-field. They provide a precise sample of the actual radiated 180-degree signal back to the station’s monitoring computer.
• Immediate Fault Detection: If the 180-degree pattern is distorted by ice or physical damage, the probes will detect a shift in the -25 dB signal level, allowing the system to automatically switch to a backup or alert air traffic control.

Sectorized Deployment Checklist

• Orientation and Aiming: The 180-degree beam is wide, but the 6063T6 aluminum reflector must be aligned precisely with the center of the required flight corridor. A 10-degree misalignment at the tower can result in a significant loss of signal at the extreme edges of the sector.
• Vertical Aperture Management: With a 38-degree vertical beamwidth, this antenna is extremely "forgiving" for aircraft at different altitudes. It is excellent for "high-site" installations where the aircraft may be significantly below the antenna's physical horizon during the final approach.
• Pulse Power Cabling: To handle 5KW pulses at 1200 MHz, use LDF4-50A (1/2" Heliax) or LDF5-50A (7/8" Heliax). Standard braided cables may experience "voltage breakdown" or excessive heat when subjected to continuous high-power DME duty cycles.
• D.C. Grounding: Ensure the mounting pipe is bonded to the tower’s primary lightning ground. The D.C. grounded design of the antenna provides the first line of defense, but the mast must have a low-resistance path to earth to protect the 5KW transmitter.