SD-312
UHF Aviation Band Stacked Dipole Array
| Model | Product Description | Frequency | Gain | Download | Enquiry | |
|---|---|---|---|---|---|---|
| SD-312 | UHF Aviation Band Stacked Dipole Array | 225-400MHz | 3 dBd. |  |  |  |
The SD-312 is a professional-grade, high-gain stacked dipole array designed for the UHF Aviation Band (225–400 MHz). Built from high-grade anodized aluminum and featuring a versatile phased design, it provides superior omnidirectional or offset coverage for mission-critical military and aeronautical ground-to-air communication.
High-Gain Versatility
The SD-312 utilizes two folded dipoles stacked vertically and fed in phase to achieve a powerful 3 dBd (5.15 dBi) omnidirectional pattern. Its unique design allows for field reconfiguration: by aligning the dipoles collinearly, the antenna can produce a 6 dBd (8.15 dBi) offset pattern to focus energy toward a specific sector. This "null-filling" capability ensures consistent signal strength throughout the intended coverage area, eliminating the communication dropouts often found in standard vertical antennas.
Industrial-Grade Durability
Constructed for longevity in high-salinity coastal environments, the SD-312 is manufactured from high-grade anodized aluminum further protected by an epoxy powder coating. This dual-layer defense shields the array from corrosive saline weather and UV radiation. The phasing harness is meticulously sealed with heavy-duty heat-shrink tubing, ensuring a completely waterproof RF junction. With a robust wind rating of 220 Km/Hr, this antenna is engineered to maintain structural and electrical integrity during hurricane-force events.
Operational and Tactical Efficiency
The SD-312 prioritizes ease of use and long-term reliability. It handles high RF power levels up to 500 Watts, making it suitable for high-traffic strategic base stations. Despite its 1.8-meter length, the system is designed for simple installation on top of towers or masts using the supplied stainless steel mounting brackets. The ability to change the radiation pattern in the field using common hand tools provides operators with the tactical flexibility to adapt to changing mission requirements without replacing hardware.
Detailed Technical Features
- Adjustable Radiation Pattern: Switch between 360° Omni (3 dBd) or Focused Offset (6 dBd) coverage.
- Optimized Beam-width: A 40-degree vertical beam-width concentrates energy toward the horizon while providing enough elevation for aircraft communication.
- Low-Noise Architecture: Stacked folded-dipole design ensures high sensitivity and a low noise floor for receivers.
- High Power Capacity: Rated for 500 Watts continuous power handling.
- Phasing Precision: Elements are fed in phase to ensure maximum gain and pattern stability.
Detailed Mechanical Features
- Corrosion-Proof Materials: Anodized aluminum support pipes (51 mm) and dipole elements (12.7 mm).
- Marine-Grade Hardware: All mounting brackets and fasteners are made of Stainless Steel.
- Weatherproof Termination: N-Female input with heat-shrink-sealed phasing harness for absolute waterproofing.
- Structure: 1.8 meters overall length with two 4.5-foot horizontal side arms for dipole spacing.
- Mounting Interface: Clamps to standard support pipes up to 52 mm (2 inches) in diameter.
Detailed Environmental Features
- Superior Wind Rating: Certified for speeds up to 220 Km/Hr (137 MPH).
- Thermal Range: Operational from -30°C to +70°C.
- Saline Resilience: Powder-coated finish specifically designed for coastal/maritime theaters.
- Humidity Tolerance: Operational in 0 to 95% RH environments.
Key Advantages
- Dual-Mode Pattern: Offers the flexibility of two antennas in one (Omni or Directional/Offset).
- Null-Filling Coverage: Advanced stacked design ensures there are no "dead spots" within the vertical signal footprint.
- Waterproof Reliability: Phasing harnesses are sealed at the factory to prevent water ingress and cable rot.
Primary Applications
- Military UHF ATC: Reliable ground-to-air communication for tactical and permanent military airfields.
- Aeronautical Ground Stations: High-power base station antenna for strategic flight information regions.
- Coastal Surveillance: Salt-resistant omni-link for naval-to-air coordination.
- Search and Rescue (SAR): High-gain coverage for emergency response hubs in the 225-400 MHz band.
| Feature | Specification | Tactical Benefit |
|---|---|---|
| Gain (Omni) | 3 dBd (5.15 dBi) | Extended circular coverage for ATC sites. |
| Gain (Offset) | 6 dBd (8.15 dBi) | Focused signal for specific flight corridors. |
| Wind Rating | 220 Km/Hr | Extreme stability in coastal storm zones. |
| Construction | Anodized Aluminum | High durability with a lightweight 7 Kg profile. |
Design Features: The SD-312 Aviation Band Antenna is manufactured using high-grade anodized aluminum. Powder coating of the complete aviation band antenna provides extra protection against corrosion in saline weather present in coastal areas. The SD-312 is heavy duty stacked dipole array features, high gain, high power handling capacity, low VSWR, low noise performance and null filling coverage with omni directional characteristics.
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