DME-1100-14-180

The DME-1100-14-180 is an elite-tier DME High Gain Directional Antenna System engineered for superior navigational accuracy in the 960–1240 MHz aeronautical band. Delivering a substantial 14 dBi gain coupled with a unique 180-degree horizontal beamwidth, this antenna provides intensive sectorized coverage for Distance Measuring Equipment (DME). Built to handle a massive 5,000 Watts of peak pulse power, it is the definitive solution for high-traffic aviation hubs and mission-critical navigational corridors requiring maximum signal reach and survivability.

Design: Intensive Sectorized Signal Propagation

The DME-1100-14-180 utilizes an advanced center-fed collinear dipole phased array integrated with a high-performance 6063T6 aluminum reflector. This architecture ensures a true 180-degree directional horizontal pattern while eliminating radiation pattern distortion. By vertically stacking large-diameter brass elements fed in phase, the antenna achieves a razor-sharp 9-degree vertical beamwidth. This extreme concentration of RF energy along the horizon provides a consistent 14 dBi gain, allowing the DME signal to maintain lock with aircraft at significantly greater regional distances.

Construction: Engineered for Aeronautical Survivability

Constructed for long-term structural integrity, the DME-1100-14-180 features fully welded internal junctions to prevent RF inter-modulation and maintain signal purity during high-power operation. The radiating structure is completely protected within a high-tech ruggedized fiberglass radome, designed to ensure survivability in the worst environmental conditions. The antenna operates at D.C. ground, providing a low-resistance discharge path for lightning protection and immunity to electrical noise—a critical feature for maintaining the timing accuracy of DME pulse pairs.

Reliability: Tactical Pulse Power & Signal Monitoring

Designed to meet the rigorous duty cycles of aviation navigation, this antenna handles 5,000 Watts of RF input power at standard DME pulse rates. For mission-critical sites, an optional coupler and dual monitoring probes are available, providing real-time radiated signal feedback at -25 dB ± 1 dB below the input level. With marine-grade 316 stainless steel mounting hardware and an olive green tactical finish, the DME-1100-14-180 is a robust, maintenance-free choice for coastal corridors and high-exposure mountain-top navigation hubs.

Technical Features

• Elite 14 dBi High Gain: Concentrated 9-degree vertical beam maximizes signal reach for long-range aeronautical navigation.
• Wide 180° Horizontal Sector: Optimized for corridor-specific navigation, directing all power into the forward hemisphere for increased efficiency.
• Massive 5KW Pulse Power Capacity: Robust electrical design specifically rated for high-intensity DME ground station transmissions.
• Center-Fed Phased Array: Eliminates pattern "squint" and distortion, ensuring stable pulse shapes across the entire 960–1240 MHz band.
• Fully Welded Brass Junctions: Prevents Passive Inter-Modulation (PIM) and ensures reliable performance under vibration and wind stress.
• Integrated Lightning Protection: D.C. grounded design provides a safe path for atmospheric discharges and reduces background noise.
• Optional Signal Monitoring: Available probes allow for automated near-field signal health checks and Category-certified monitoring.
• Marine Grade 316 Stainless Steel: Includes high-quality mounting hardware for maximum corrosion resistance in high-salinity environments.
• Rugged Fiberglass Radome: Provides 360-degree protection against ice, UV radiation, and physical impact.
• Factory Tuned Readiness: Arrives pre-calibrated for immediate deployment without the need for field adjustments.

DME Sector Coverage Guide: Long-Range Navigation with the DME-1100-14-180

In the 960–1240 MHz aeronautical band, Distance Measuring Equipment (DME) ground stations must provide high-integrity pulse pairs to aircraft at extreme distances. The DME-1100-14-180 is a "high-gain sector antenna" designed to push the boundaries of the radio horizon by focusing RF energy into a razor-sharp 9-degree vertical beam.

1. The Precision of the 9-Degree Vertical Beam

High-gain antennas achieve their range by compressing the signal into a thin "disk." While an omnidirectional antenna spreads power in all directions, the DME-1100-14-180 concentrates its 14 dBi gain almost entirely toward the horizon.

• Regional Reach: A 9-degree vertical beamwidth ensures that the 5,000-watt pulses are directed where they are needed most—at distant aircraft. This prevents "wasting" power on the ground near the tower or into the upper atmosphere.
• Stable Long-Range Lock: This narrow aperture provides a massive link budget, allowing aircraft to achieve a stable DME lock much earlier in their flight path, which is critical for high-speed transition and approach phases.

2. 180-Degree Sectorized Efficiency

For many navigational corridors—such as those following a coastline, a valley, or a specific international airway—providing a 360-degree signal is inefficient.

• Front-Loaded Power: The 6063T6 aluminum reflector forces all radiated energy into the forward 180-degree hemisphere. This doubling of effective power (compared to an omni antenna) ensures that the forward sector is saturated with a high-strength signal.
• Rear-Axis Rejection: With a 10 dB Front-to-Back ratio, the antenna significantly reduces multi-path interference and "clutter" from signals reflecting off mountains or structures located behind the tower.

3. Managing 5KW Pulses & Pulse Integrity

DME is a pulse-ranging technology. The accuracy of the distance measurement depends entirely on the ground station's ability to mirror the aircraft's interrogation pulse with microsecond precision.

• Center-Fed Phased Array: The Center-Fed design ensures that the signal reaches all brass elements simultaneously. This prevents "phase jitter" and ensures the pulse shape remains sharp and undistorted.
• High Peak Power Handling: At 1.2 GHz, 5,000-watt pulses generate significant electrical stress. The fully welded junctions and high-quality brass radiating elements prevent internal arcing and Passive Inter-Modulation (PIM), which could otherwise "blur" the pulse timing and cause distance errors.

4. Safety-of-Life Monitoring (Optional)

For Category-rated navigational aids, the antenna must be "self-aware." If the radiation pattern is distorted by heavy ice or physical damage, the system must shut down or alert the technician.

• The -25 dB Monitoring Probes: The optional dual probes act as internal monitors. They provide a precise -25 dB sample of the 180-degree radiated wave back to the ground station's monitoring unit.
• D.C. Grounded Safety: Because these antennas are often mounted on high, exposed towers, the D.C. grounded design is essential. it provides a low-resistance path to earth for static buildup and atmospheric discharges, protecting the 5KW transmitter from lightning damage.

High-Gain Sector Deployment Checklist

• Tower Plumb and Verticality: With a 9-degree vertical beam, mounting accuracy is critical. A tilt of just 3-4 degrees can send your primary signal into the ground or over the top of the intended flight corridor. Use a high-precision digital level during installation.
• Horizontal Alignment: The 180-degree beam is wide, but the center of the reflector must be pointed precisely at the center of the required navigational sector to maximize the 14 dBi gain.
• High-Power Feeders: To handle 5KW peak pulses at 1200 MHz, use only high-grade corrugated coaxial cables like LDF4-50A (1/2" Heliax). Standard braided cables may degrade rapidly under the high-voltage stress of DME pulse pairs.
• Connector Weatherproofing: The N-Female termination is enclosed at the bottom. Always use a professional weatherproofing kit (butyl rubber and UV-resistant tape) to prevent moisture wicking. In DME systems, even a small amount of moisture in the connector can cause pulse timing "drift" and system failure.