SD9-450
VHF High Gain Stacked Dipole Array
| Model | Product Description | Frequency | Gain | Download | Enquiry | |
|---|---|---|---|---|---|---|
| SD9-450 | VHF High Gain Stacked Dipole Array | 406 – 512 MHz. | 9 dBd. |  |  |  |
The SD9-450 is a professional-grade UHF stacked dipole array designed for the 406–512 MHz spectrum. Featuring eight vertically stacked folded dipoles, this antenna is engineered for high-density radio sites requiring superior omni-directional coverage and "long-haul" reach. Its high-gain characteristics and robust construction make it a primary choice for regional repeaters, paging systems, and multi-channel UHF communication hubs.
Strategic Gain and Field-Adjustable Patterns
The SD9-450 provides exceptional coverage versatility. When the eight dipoles are arranged 90° apart around the central mast, it delivers a 9 dBd omni-directional pattern for full 360 degrees coverage. For missions requiring targeted sector energy, the dipoles can be aligned collinearly to provide a 12 dBd offset pattern. These adjustments can be made in the field using common hand tools, allowing for real-time site optimization.
Industrial-Grade Structural Hardening
Constructed from high-strength 6063T6 architectural-grade aluminum, the antenna is built to survive punishing environmental theaters, boasting a wind rating of 200 Km/Hr. The 6-meter (19.7-foot) overall length is designed with logistics in mind, shipping in two manageable 3-meter sections. To ensure long-term electrical stability, the phasing harness is sealed with flame-retardant heat-shrink tubing for complete waterproofing.
Operational Resilience and Safety
Designed for high-capacity infrastructure, the SD9-450 handles up to 250 Watts of RF power with a razor-sharp 9-degree vertical beam-width, concentrating signal energy toward the horizon. For electrical safety, the antenna operates at direct D.C. ground, providing an integrated low-resistance discharge path to shield sensitive base station equipment from lightning strikes and atmospheric static.
| Feature | Specification | Tactical Benefit |
|---|---|---|
| Gain | 9 dBd (Omni) / 12 dBd (Offset) | Adaptable coverage for varying terrain requirements. |
| Vertical Beam | 9 Degrees | Maximum horizon reach; high spectral efficiency. |
| Wind Rating | 200 Km/Hr | Stays operational in hurricane-force conditions. |
| Mounting | 1.35m Side Arms included | Easy tower integration with minimal pattern distortion. |
Detailed Technical Features
- Dual-Gain Versatility: Switchable between 9 dBd (Omni) and 12 dBd (Offset) patterns.
- Vertical Precision: 9-degree half-power vertical beam-width maximizes long-distance propagation.
- Power Capacity: Supports continuous RF power handling of up to 250 Watts.
- Phasing Integrity: All eight dipoles are fed in phase to ensure peak gain and pattern stability.
- Null-Fill Coverage: Specifically engineered to provide consistent signal strength to near-field users, eliminating dead zones close to the tower.
Detailed Mechanical Features
- Array Length: 6-meter overall height, collapsible to 3-meter sections for shipping.
- Materials: 51 mm O.D. aluminum support pipe with 12.7 mm O.D. folded dipoles.
- Side-Mount Integration: Supplied with two 1.35-meter (4.5 feet) horizontal side arms to ensure proper clearance from the tower structure.
- Elite Fasteners: All mounting hardware and fasteners are made of Marine Grade Stainless Steel.
- Gross Weight: Manageable at 18 Kgs, reducing tower loading.
Detailed Environmental Features
- Hurricane Resilience: Wind rating of 200 Km/Hr (125 MPH).
- Thermal Hardening: Fully operational in extreme temperature windows from -30°C to +70°C.
- Moisture Defense: Heat-shrink sealed harness ensures performance remains stable in 0 to 95% RH environments.
- Lightning Protection: Direct D.C. ground path integrated into the framework.
Key Advantages
- Tactical Versatility: The field-adjustable pattern allows for easy adaptation between regional coverage and high-gain sectorized links.
- Infrastructure Compatibility: Side-mounting arms allow the antenna to be installed on existing towers without pattern distortion from the tower structure itself.
- Logistical Efficiency: Two-section shipping design reduces transport costs and simplifies handling for remote site deployments.
Primary Applications
- UHF Repeater Base Stations: High-gain backbone for regional UHF voice and data networks.
- Regional Paging Systems: Reliable, high-power signal distribution for mission-critical paging infrastructure.
- Populated Radio Sites: Designed to maintain low-noise performance in crowded RF environments.
- Remote Data & Sensor Backhaul: Ideal for establishing links between core infrastructure and distant remote sites.
Design Features: The SD9-450 high performance UHF stacked dipole array is designed for use with highly populated radio sites requiring long haul omni directional coverage. The SD9-450 is heavy duty stacked dipole array features, wide bandwidth, high gain, high power handling capacity, low VSWR, low noise performance and null filling coverage with omni directional characteristics. This stacked dipole array is highly suitable as base station antennas for Repeater and Paging sites.
| ||||||||||||||||||||||||||||||||||||||||||||||||||
