AC3-75
High Gain Fiber Glass Collinear Antenna
| Model | Product Description | Frequency | Gain | Download | Enquiry | |
|---|---|---|---|---|---|---|
| AC3-75 | High Gain Fiber Glass Collinear Antenna | 66-88MHz. | 3 dBi. |  |  |  |
The AC3-75 is a professional-grade, low-band VHF fiberglass omnidirectional collinear antenna designed for the 66–88 MHz spectrum. Engineered for high-reliability base station applications, this model utilizes a specialized center-fed design to ensure a true 360 degrees horizontal radiation pattern. With its ruggedized construction and tactical Olive Green finish, it serves as a robust foundation for regional low-band VHF networks, particularly in challenging environmental conditions.
Precision Low-Band Coverage
The AC3-75 utilizes vertically stacked, large-diameter brass radiating elements fed in phase to achieve a stable 3 dBi gain. Its center-fed architecture is a critical engineering feature; unlike base-fed antennas that often suffer from pattern distortion or "beam tilt," this design ensures a perfectly symmetrical horizontal footprint. With a wide 72-degree vertical beam-width, the antenna provides excellent regional coverage, making it ideal for maintaining links over varying terrain.
Strategic Structural Hardening
Constructed from high-class brass and 6063T6 architectural aluminum alloy, the antenna is built for long-term survival. All internal junctions are fully welded to prevent RF inter-modulation (PIM), ensuring signal purity even at sites with high RF density. The entire internal array is protected within a high-tech ruggedized fiberglass radome, which is RF-transparent and strong enough to withstand wind loads up to 200 Km/Hr.
Maintenance-Free Reliability
Designed for "set-and-forget" operation, the AC3-75 requires no field tuning or adjustments. Factory-optimized stub matching ensures a smooth VSWR of better than 1.5:1 across its operational bandwidth. The antenna termination is enclosed at the bottom for total weather protection, while the marine-grade stainless steel mounting hardware ensures a secure, oxidation-free installation.
Performance Summery
| Feature | Specification | Tactical Benefit |
|---|---|---|
| Gain | 3 dBi | Reliable regional omni coverage. |
| Vertical Beam | 72 Degrees | Wide vertical aperture for stable terrain coverage. |
| Wind Rating | 200 Km/Hr | Stays operational in hurricane-force conditions. |
| Power Handling | 250 Watts | Supports high-capacity regional transmitters. |
Detailed Technical Features
- Balanced Gain: Constant 3 dBi gain for reliable low-band VHF signal penetration.
- Vertical Directivity: Wide 72-degree half-power vertical beam-width ensures signal stability across diverse topography.
- Stable VSWR: Maintains a VSWR of better than 1.5:1 across the 2.5 MHz operational window.
- Power Capacity: Supports high RF power handling of up to 250 Watts.
- Phasing Integrity: Center-fed design ensures a distortion-free, circular horizontal radiation pattern.
Detailed Mechanical Features
- Radiating Elements: High-grade, large-diameter brass elements stacked for peak aperture efficiency.
- Structural Length: 3.0-meter (approx. 10 feet) overall length provides a significant profile for low-band propagation.
- Premium Materials: 51 mm O.D. aluminum support pipe and high-strength 45 mm O.D. fiberglass radome.
- Elite Fasteners: Supplied with Marine Grade Stainless Steel mounting hardware for masts up to 51 mm (2 inches).
- Logistics: Manageable gross weight of 5 Kgs, allowing for relatively easy handling despite its 3-meter length.
Detailed Environmental Features
- Hurricane Resilience: Wind survival rating of 200 Km/Hr (125 MPH).
- Thermal Hardening: Operational in extreme climates from -30°C to +70°C.
- Climate Defense: High-tech radome and specialized materials provide a hermetic seal against ice, rain, and corrosive pollutants.
- Humidity Tolerance: Certified for operation in 0 to 95% RH environments.
Key Advantages
- Pattern Purity: The center-fed design guarantees a perfectly circular footprint, essential for central network nodes in the 66-88 MHz band.
- Tactical Finish: Standard military Olive Green finish supports concealment for defense and secure government infrastructure.
- Maintenance-Free Build: Fully welded internal junctions and air-sealed radome prevent performance drift and corrosion over time.
Primary Applications
- Low-Band VHF Base Stations: Reliable master antenna for regional voice and data networks.
- Public Safety Infrastructure: Consistent omnidirectional coverage for emergency services and first responders.
- Tactical Command Posts: Rugged, 10-foot design is perfect for establishing permanent or semi-permanent command nodes.
- Industrial Monitoring: Ideal for wide-area SCADA and telemetry links in harsh environmental conditions.
Design Features : AC3-75 Fiberglass Omni-directional Collinear Antenna is VHF lower band, rugged all weather models uses high class brass and aluminum alloy and does not require any field tuning or adjustments. All junctions are fully welded to prevent RF inter-modulation and antenna is completely protected within a high-tech ruggedized radome to ensure survivability in the worst environments. The compact size of fiber glass collinear antenna allows easy handling and shipping.
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