DME-1100

The DME-1100 is a professional-grade Fiberglass Omnidirectional Collinear Antenna specifically engineered for Distance Measuring Equipment (DME) within the 960–1215 MHz frequency range. This high-performance phased array delivers a consistent 9 dBi gain across the entire L-band spectrum, ensuring reliable navigational data for aeronautical ground stations. Built with 6063T6 architectural aluminum and housed in a ruggedized radome, the DME-1100 is designed to survive extreme environmental stressors, from high-salinity coastal spray to abrasive desert sandstorms.

Design: Precision Phased Array for Aviation

The DME-1100 utilizes a sophisticated center-fed collinear dipole phased array design. This architecture is vital for aeronautical precision as it eliminates radiation pattern distortion and ensures a true, symmetrical 360-degree horizontal pattern. By vertically stacking large-diameter brass radiating elements and feeding them in phase, the antenna achieves an 18-degree vertical beamwidth. This concentrated aperture focuses RF energy toward the horizon, providing a constant 9 dBi gain that ensures reliable signal interception for aircraft across the broadband frequency range.

Construction: Aero-Ruggedized & Maintenance-Free

Engineered for ultimate mechanical integrity, the DME-1100 features fully welded internal junctions to prevent RF inter-modulation (PIM) and maintain signal purity. The radiating structure is completely protected within a high-tech ruggedized fiberglass radome, specifically designed to control friction-induced static created by wind and dust—a critical feature for preventing noise in sensitive navigation receivers. All exposed metallic parts are finished with an epoxy-based powder coating, providing total protection against corrosive gases, UV radiation, and acid rain.

Reliability: Advanced Monitoring & Environmental Shielding

This antenna is an all-weather powerhouse rated for wind speeds up to 200 Km/Hr. For mission-critical navigation hubs, the antenna supports an optional coupler and dual monitoring probes. These probes allow real-time sampling of the radiated signal at -25 dB ± 1 dB below the input power, ensuring the station's navigational output remains within strict safety tolerances. With marine-grade 316 stainless steel mounting hardware, the DME-1100 provides a robust, "set-and-forget" solution for essential distance measuring infrastructure.

Technical Features

• High-Intensity 9 dBi Gain: Optimized 18-degree vertical aperture delivers superior signal reach for ground-to-air navigational links.
• Broadband 960–1215 MHz Coverage: Designed for the entire DME frequency spectrum without the need for field tuning.
• Friction Static Control: Specialized radome architecture dissipates static buildup from wind and dust, protecting receiver electronics.
• True Omnidirectional Pattern: Center-fed architecture ensuring symmetrical 360° horizontal coverage without pattern distortion.
• Fully Welded Internal Junctions: Eliminates Passive Inter-Modulation (PIM) for a cleaner, high-fidelity navigational signal.
• No Ground Plane Required: Provides peak electrical performance regardless of the mounting surface or mast type.
• Optional Signal Monitoring: Available coupler and probes provide precise -25 dB feedback for automated system health checks.
• Marine Grade 316 Stainless Steel: High-quality hardware ensures maximum resistance to rust and salt fog in coastal climates.
• High-Power 150W Capacity: Robust electrical design handles the continuous power requirements of distance measuring equipment.
• Tactical Military Finish: Supplied with an Olive Green epoxy coating for durability against UV radiation and physical impact

DME Site Optimization Guide: Navigation Reliability in Harsh Environments

In the critical 960–1215 MHz aeronautical band, Distance Measuring Equipment (DME) must provide 24/7 precision, often in isolated or extreme locations. The DME-1100 is engineered to address the specific physical and electrical challenges of ground-to-air navigation, specifically focusing on signal purity and environmental hardening.

1. Mitigating Friction-Induced Static (E-Field Management)

In desert environments or high-wind coastal areas, airborne particles (sand, dust, or salt) rubbing against a standard fiberglass radome can create a massive buildup of static electricity, known as P-Static.

• The "Quiet" Radome: The DME-1100 features a specialized radome design that allows for the controlled dissipation of friction-induced static.
• Receiver Protection: Without this feature, static discharges can create "RF noise bursts" that interfere with the delicate pulse-pair timing of DME signals. By draining this charge safely, the antenna maintains a low noise floor, ensuring the ground station can accurately "hear" distant aircraft interrogators even during sandstorms.

2. Center-Fed Phased Array: Ensuring Pulse Integrity

DME relies on precise timing between transmitted and received pulse pairs to calculate distance. Any distortion in the radiation pattern can lead to "distance errors" or loss of lock.

• True Omni-Directional Symmetry: The Center-Fed design ensures that the 9 dBi gain is perfectly symmetrical. Unlike end-fed antennas that may have a signal "tilt" at different frequencies, this phased array maintains a rock-solid 18-degree vertical beam across the entire 255 MHz bandwidth.
• Constant Timing: This stability ensures that the signal phase and amplitude remain constant for an aircraft regardless of its bearing to the station, which is essential for the high-precision requirements of modern aviation.

3. Integrated Signal Monitoring (Coupler & Probes)

For high-reliability sites (Category I/II/III ILS/DME), the ability to monitor the "near-field" radiated signal is a safety-of-life requirement.

• Real-Time Health Checks: The optional -25 dB monitoring probes provide a direct sample of the actual radiated energy. If the antenna’s performance degrades due to physical damage or internal failure, the ground station monitor can detect the shift immediately via the probe output.
• Redundancy: By using dual probes, site technicians can cross-reference signal health, ensuring that the navigation data being broadcast to aircraft is always within the strict tolerances required by aviation authorities.

4. Environmental Hardening: Salt, Sand, and Ice

DME stations are frequently located in exposed areas, from salt-heavy shorelines to freezing mountain peaks.

• Welded Reliability: All internal brass elements are fully welded. This prevents "mechanical noise" (PIM) caused by vibrations in 200 Km/Hr winds, which could otherwise corrupt the digital pulse data.
• Corrosion Resistance: The combination of 6063T6 aluminum, marine-grade 316 stainless steel, and epoxy powder coating ensures that the antenna will not degrade electrically due to oxidation, even after years of exposure to acid rain or salt spray.

DME Deployment Checklist

• Clearance and Siting: The DME-1100 does not require a ground plane, but it should be mounted at the highest possible point on the mast to ensure a clear "Radio Horizon."
• Probe Calibration: If using the optional monitoring probes, ensure the cables connecting the probes to the monitor are phase-stable and high-quality to maintain the ± 1 dB accuracy of the feedback signal.
• Lightning Protection: While the antenna is rugged, ensure the 51mm aluminum support pipe is bonded to a dedicated lightning ground. The fiberglass radome protects the elements, but a direct strike to the mast requires a low-resistance path to earth.
• Connector Weatherproofing: The N-Female termination is protected at the base. Always use a professional weatherproofing kit (butyl rubber and UV-resistant tape) to prevent moisture wicking, which is the most common cause of DME system failure.