SD3-150
VHF High Gain Stacked Dipole Array
| Model | Product Description | Frequency | Gain | Download | Enquiry | |
|---|---|---|---|---|---|---|
| SD3-150 | VHF High Gain Stacked Dipole Array | 136 – 174 MHz. | 3 dBd. |  |  |  |
The SD3-150 is a professional-grade VHF stacked dipole array designed for the 136–174 MHz band. Featuring two vertically stacked folded dipoles, this antenna is engineered for high-density radio sites requiring dependable regional coverage. With its high power handling and MIL-STD-810G environmental hardening, it serves as a robust base station solution for PMR, repeater, and paging sites, especially in corrosive coastal or industrial environments.
Field-Adjustable Radiation Patterns
The SD3-150 provides excellent operational flexibility. Technicians can optimize coverage in the field using common hand tools:
- Omni-Directional (3 dBd / 5.15 dBi): Arrange the two dipoles 180° apart around the central mast for 360 degrees coverage.
- Offset Directional (6 dBd / 8.15 dBi): Align both dipoles collinearly (facing the same direction) to focus energy toward a specific sector.
Tactical Construction and MIL-SPEC Hardening
Constructed from 6063T6 architectural-grade aluminum, the antenna is further protected by a powder-coated finish to withstand saline coastal weather. It is fully compliant with MIL-STD-810G standards, ensuring survival against salt fog, fungus, heavy rain, and extreme thermal stress. The 3.6-meter (12-foot) central mast is shipped in two sections of 1.8 meters for logistics efficiency and easier handling during transport.
Operational Resilience & Safety
Designed for "always-on" infrastructure, the SD3-150 handles up to 500 Watts of RF power with a stable VSWR of better than 1.5:1. Its 36-degree vertical beam-width provides a balanced capture area for both near-field and long-haul signals. For electrical safety, the antenna operates at direct D.C. ground, providing a dedicated path for lightning discharge to protect sensitive base station electronics.
| Feature | Specification | Tactical Benefit |
|---|---|---|
| Gain | 3 dBd (Omni) / 6 dBd (Offset) | Adaptable coverage for varying terrain. |
| Environmental | MIL-STD-810G Certified | Maximum durability in extreme operational theaters. |
| Wind Rating | 200 Km/Hr | Stays operational in hurricane-force conditions. |
| Power Handling | 500 Watts | Supports high-power, multi-channel transmitters. |
Detailed Technical Features
- Dual-Gain Modes: Switchable between 3 dBd (Omni) and 6 dBd (Offset) patterns.
- Vertical Reach: 36-degree half-power vertical beam-width for balanced regional propagation.
- High Power Reserve: Supports continuous RF power handling of up to 500 Watts.
- Signal Integrity: Low noise performance and null-fill characteristics for consistent site coverage.
- Phasing Accuracy: Center-fed harness ensures both dipoles are fed in phase for maximum efficiency.
Detailed Mechanical Features
- Sectional Design: 3.6-meter overall length, collapsible to 1.8-meter (6 feet) sections for shipping.
- Industrial Materials: 51 mm O.D. aluminum support pipe with 12.7 mm O.D. folded dipoles.
- Elite Fasteners: Supplied with two high-grade Marine Grade Stainless Steel mounting brackets.
- Weight Profile: Lightweight and easy to install at just 10 Kgs.
- Mounting Interface: Clamps securely to vertical masts up to 52 mm (2 inches) in diameter.
Detailed Environmental Features (MIL-STD-810G)
- Theater Hardening: Certified against Salt Fog (Method 509.5) and Fungus Resistance (Method 508.6).
- Mechanical Rigidity: High resistance to Shock (Method 516.6) and Vibration (Method 514.6).
- Climate Defense: Advanced sealing for driving Rain (506.5) and Humidity (507.5).
- Thermal Endurance: Maintains operation in extreme High/Low Temperatures (Methods 500.5 & 502.5).
- Hurricane Resilience: Wind survival rating of 200 Km/Hr.
Key Advantages
- Pattern Versatility: Easily switch between regional omni-coverage and sectorized gain in the field.
- Coastal Defense: The combination of anodized aluminum and powder coating ensures maximum survival in salt-rich environments.
- Logistical Ease: Two-section mast design simplifies shipping and site delivery.
Primary Applications
- PMR and Repeater Sites: Reliable backbone for private mobile radio and VHF repeater networks.
- Coastal Monitoring: Specialized hardening makes it ideal for maritime and port authority communications.
- Paging Infrastructure: High power handling for mission-critical paging distribution.
- Remote Field Command: Balanced weight and sectional design for rapid-deployment command centers.
Design Features:The SD3-150 high performance VHF stacked dipole array is designed for use with highly populated radio sites requiring long haul omni directional coverage. The SD3-150 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.
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