APT-7513

The APT-7513 is a high-performance tactical grid parabolic antenna specifically designed for the 610–960 MHz (NATO Band II) frequency range. This 0.9-meter (3-foot) system provides a powerful directional link for conventional radio relay, combining wideband versatility with a rugged, field-ready construction.

Performance Features

The APT-7513 is engineered to cover the entire NATO Band II, offering a progressive isotropic gain that scales from 13 dBi at the low band to 16 dBi at the high end. Its directional radiation pattern features low side lobes, making it an ideal choice for maintaining high-quality links in crowded electromagnetic spectrums. Designed for rapid field use, it requires only one operator for installation and features a mounting arrangement that allows for a quick change between vertical and horizontal polarization via the rear mounting hardware.

Durability and Construction

Built for the rigors of tactical environments, the APT-7513 is constructed from 6063T6 ultra-corrosion-resistant architectural aluminum alloy. To ensure survival in extreme climates, it is finished with a military green epoxy-based anti-corrosive paint. All mechanical fasteners, including screws, nuts, and bolts, are made of marine-grade stainless steel. The primary feed and radiating elements are crafted from high-quality brass for maximum electrical efficiency. The antenna is fully MIL-STD-810G compliant, rated to operate from -30°C to +70°C and survive wind speeds up to 180 Km/Hr.

Operational Efficiency

Efficiency in the APT-7513 is driven by its ease of deployment and electrical protection. The primary feed is fitted to the center of the 0.9-meter reflector using a quick fastener system, allowing for rapid assembly. For hardware safety and signal purity, the antenna operates at D.C. ground, providing a low-resistance discharge path for lightning protection and immunity to atmospheric noise. At a gross weight of 10 Kgs, it remains highly portable for tactical radio relay teams.

Detailed Technical Features - RF & Electrical Performance

• Band-Specific Optimization: Fine-tuned to cover the entire 610–960 MHz range, ensuring full compatibility with standard NATO Band II radio relay and tactical trunking equipment.
• Progressive Isotropic Gain: The parabolic efficiency scales across the band to provide optimal signal punch:
  • 13 dBi at the Low Band (610 MHz)
  • 16 dBi Typical at the High Band (960 MHz)
• Precision Directivity: Concentrates RF energy into a directional half-power beam-width that narrows from 38° to 24° as frequency increases. This balance provides a robust link that is forgiving enough for rapid manual alignment while remaining highly directional.
• Superior Signal Isolation:
  • Front-to-Back Ratio (>20 dB): Effectively rejects noise and interference originating from behind the antenna, which is critical for maintaining high throughput in "congested" electromagnetic environments.
  • Low Side Lobes: Engineered to minimize parasitic radiation, preventing interference with other co-located communication systems on the same tactical mast.
• High Power & Safety:
  • 250 Watts CW: Robust power handling capacity for high-intensity, long-range microwave and radio links.
  • Direct D.C. Grounding: The radiating element is internally grounded to provide a low-resistance discharge path, offering essential protection against lightning strikes and static noise buildup for a higher Signal-to-Noise Ratio (SNR).

Detailed Mechanical Features - Structural Engineering & Materials

• Architectural Grade Reflector: The 0.9-meter (3-foot) grid parabolic dish is fabricated from 6063T6 aluminum alloy, known for its elite strength-to-weight ratio and resistance to stress-corrosion.
• Aerodynamic Grid Construction:
  • Support Rim: 25.4mm (1") outer diameter aluminum tube for rigid structural support.
  • Grid Members: 12.7mm (1/2") outer diameter aluminum pipes, spaced to allow high-velocity winds to pass through the reflector, significantly reducing "wind-sail" force on the mast.
• High-Conductivity Feed: The radiating elements and the dipole feed are crafted from High-Quality Brass, ensuring maximum electrical efficiency and minimal signal loss at the focal point.
• Marine-Grade Hardware: Every screw, nut, and bolt is manufactured from Marine-Grade Stainless Steel to prevent oxidation and "seizing" in high-salinity coastal or humid tropical theaters.

Tactical Versatility & Logistics

• Single-Operator Deployment: With a gross weight of 10 Kgs, the antenna is designed for rapid manual handling. The quick-fastener system allows for the tool-free attachment of the primary feed to the reflector center.
• Field-Adjustable Polarization: The mounting arrangement at the rear of the antenna permits a 90-degree rotation, allowing the operator to switch between Vertical and Horizontal polarization in the field without disassembling the mount.
• Mounting Interface: Designed to clamp securely onto any standard vertical mast with a diameter of up to 52 mm (2 inches).
• Military Finish: The unit is finished in a matte Military Olive Green epoxy-based anti-corrosive powder paint, providing a low visual signature and a ruggedized shield against UV and chemical exposure.

The APT-7513 is engineered to meet the rigorous demands of global defense and industrial standards, ensuring it remains operational in the world’s most hostile environments. By adhering to international military and environmental protocols, this antenna guarantees interoperability and long-term reliability for NATO and allied forces.

Military Standard Compliance (MIL-STD-810G)

The antenna is designed to withstand the following environmental stresses as defined by MIL-STD-810G:

• Low Temperature (Method 502.5): Reliable operation in arctic or high-altitude conditions down to -30°C.
• High Temperature (Method 501.5): Sustained performance in desert environments with ambient temperatures up to +70°C.
• Humidity (Method 507.5): Tested to withstand up to 95% relative humidity without degradation of the epoxy finish or electrical performance.
• Vibration & Shock (Method 514.6 / 516.6): Ruggedized construction using 6063T6 aluminum and stainless steel prevents structural failure during transport in tactical vehicles or exposure to nearby blast overpressures.
• Salt Fog/Corrosion (Method 509.5): Utilization of marine-grade stainless steel and anti-corrosive epoxy paint protects the grid and feed from salt-air corrosion in coastal deployments.
• Wind Loading: Structural integrity maintained in high-velocity winds up to 180 Km/Hr.

Global Regulatory & Environmental Compliances

• NATO Band-II Compatibility: Fully compliant with NATO frequency standards (610 - 960 MHz), ensuring seamless integration into international joint-force communication networks.
• RoHS Compliant: Manufactured in accordance with the Restriction of Hazardous Substances directive, ensuring the materials used (including the high-quality brass and aluminum) are environmentally safe and free from lead, cadmium, and mercury.
• REACH Standards: Adheres to the Registration, Evaluation, Authorisation, and Restriction of Chemicals to ensure all materials used in the epoxy coating and structural components meet high human health and environmental safety levels.
• ISO 9001:2015 Quality Management: Produced under strict quality control protocols to ensure every unit meets the exact electrical and mechanical tolerances required for mission-critical radio relay.
• Lightning Protection (IEC/IEEE Standards): Features a direct D.C. ground path to provide high-level immunity against atmospheric discharge, meeting international safety standards for outdoor electronic equipment.
• IP-66 Ingress Protection: The primary feed and electrical terminations are designed to prevent the ingress of dust and high-pressure water jets, ensuring the antenna operates through heavy monsoon rains and sandstorms.

Key Advantages

The APT-7513 stands out in the tactical communication market due to its balance of portability and high-tier electrical performance. Below are the primary advantages of this system:

• Superior Signal Isolation: With a front-to-back ratio exceeding 20 dB and a design optimized for low side lobes, this antenna is exceptionally "quiet" in crowded spectrums. It allows multiple antennas to be co-sited on the same mast or ridge without causing mutual interference, which is critical for complex command centers.
• Rapid Field Deployment: Time is a luxury in tactical scenarios. The antenna features a quick-fastener system and is lightweight enough (10 Kgs) to allow a single operator to assemble and align the unit in minutes. The ability to switch between vertical and horizontal polarization without dismantling the entire structure provides immediate tactical flexibility.
• Ruggedized Survival Profile: Unlike commercial-grade antennas, the APT-7513 is built for "deploy and forget" reliability. The combination of 6063T6 aluminum, marine-grade stainless steel, and brass ensures it will not corrode in coastal or humid jungle environments. Its 180 Km/Hr wind rating ensures the link stays active during severe storms.
• Enhanced Electrical Safety: The integrated D.C. ground path serves a dual purpose: it acts as a built-in lightning arrestor to protect expensive radio equipment and serves as an immunity shield against static noise, ensuring the highest possible Signal-to-Noise Ratio (SNR).

Key Applications

Designed specifically for NATO Band-II operations, the APT-7513 is a versatile tool for both military and specialized civilian sectors:

• Tactical Radio Relay (Point-to-Point): The primary application is establishing high-capacity "backhaul" links between mobile command posts. It acts as a bridge to carry voice, data, and video over long distances where satellite or fiber infrastructure is unavailable or compromised.
• Fixed-Station Military Infrastructure: Due to its high gain (16 dBi) and anti-corrosive epoxy finish, it is ideal for permanent installation at border outposts, airbases, and naval stations to provide reliable long-range communication links.
• Crowded Electromagnetic Environments: In modern warfare or urban disaster zones where the spectrum is saturated with signals, the APT-7513’s directional grid design is essential. It focuses energy precisely on the intended target, cutting through the "noise" and resisting electronic jamming or unintentional interference.
• Emergency Disaster Recovery: Because the antenna can be mounted on a variety of mast sizes (up to 2 inches) and requires only one operator, it is a perfect solution for rapid-response teams needing to restore communication networks in regions where cell towers have been destroyed.
• NATO Band-II Interoperability: As it covers the full range of 610–960 MHz, it is fully compatible with a wide array of standardized NATO radio equipment, allowing for seamless multinational joint operations.