AH-280

AH-280 High-Gain UHF SATCOM Helical Antenna

The AH-280 is a military-grade Circular Polarized High-Gain Helical Antenna precision-engineered for the 240–325 MHz or 243-318MHz UHF spectrum. Delivering a robust 12 dBic gain and a standard 500-Watt power handling capacity (up to 2KW optional), this directional aperture is a premier solution for SATCOM ground stations and tactical long-range communications. By utilizing advanced helical winding and circular polarization (RHCP/LHCP), the AH-280 provides superior signal penetration through atmospheric obstructions and effectively mitigates multipath interference. Its wideband design eliminates the need for multiple narrowband antennas, providing a unified solution for modern satellite links and terrestrial communication.

Battlefield Durability: Built to survive the most punishing environmental extremes

The AH-280 is encased in a high-strength, 400 mm diameter fiberglass radome that shields the precision copper radiating elements from physical impact, ice loading, and corrosive atmospheres. Featuring an epoxy-based electrostatic powder coating and marine-grade stainless steel hardware, the antenna is built to exceed MIL-STD-810G standards and carries an IP66 rating. This ensures mission-readiness in everything from arctic freezes at -40°C to desert heat at +70°C, maintaining structural integrity in winds up to 200 Km/Hr.

Operational Efficiency: Maximum power projection and signal integrity achieved through advanced RF engineering.

Efficiency is maximized by securing heavy-duty enameled copper winding directly to the radome wall, which prevents geometry shifts and eliminates internal RF inter-modulation. Its optimized 50-degree beamwidth and stable 20 dB Front-to-Back ratio ensure that the high-power RF energy is concentrated exactly where it is needed, maximizing link distance for satellite tracking while providing extreme isolation from ground noise and rearward interference.

Detailed Technical Features

• Broadband UHF Performance: Operates across the entire 240–325 MHz window without the need for field tuning or multiple apertures.
• High-Gain Directional Output: Provides a consistent 12 dBic gain, outperforming significantly larger and more expensive linear Yagi arrays.
• Extreme Power Scaling: Standard handling of 500 Watts, with factory options for 1KW, 1.5KW, and 2KW configurations for high-intensity missions.
• Circular Polarization (CP) Mastery: Available in RHCP or LHCP to virtually eliminate Faraday rotation and mitigate signal fading.
• Dual-Axis Tactical Steering: Supplied with a specialized mounting arrangement for 360° Azimuth and 90° Elevation tracking.
• Advanced Inter-Modulation Protection: High-strength enameled copper elements are secured to the radome wall to maintain precise electrical geometry.
• Wide Sector Coverage: Features a 50-degree HPBW (Half Power Beamwidth), facilitating easier satellite acquisition and tracking for mobile assets.
• Ruggedized Termination: Features a high-quality N-Female connector for 500 watts and DIN-Female for high-power option 1KW, 1.5KW, and 2KW
• Scalable Array Architecture: Supports DUAL or QUAD stacked formations for ultra-high-gain requirements using custom phasing harnesses.

MIL-STD-810G Compliances

The AH-280 is rigorously tested to MIL-STD-810G protocols, ensuring 24/7 survivability in the most hostile tactical environments:

EW, SIGINT & Monitoring Compatibility

• Electronic Warfare (EW): Acts as a high-intensity directional jammer for UHF satellite links. Its circular polarization ensures the jamming signal is not rejected by the target's polarization-diversity filters, while the high power capacity (up to 2KW) allows for overwhelming signal saturation.
• Signals Intelligence (SIGINT): The high Front-to-Back ratio (20 dB) and clean noise floor allow operators to intercept weak, long-range UHF telemetry and tactical satellite communications with high fidelity.
• Persistent Monitoring: Serves as a high-gain electronic "tripwire" for the discovery and characterization of rogue UHF emitters in high-reflection environments like urban centers or littoral zones.

Global & Environmental Compliances

• MIL-STD-810G Certified: Rigorously tested for High/Low Temperature, Humidity, Shock (Procedure IV), Vibration (Procedure I), Rain (IP66), Fungus, and Salt Fog.
• IP66 Ingress Protection: Fully sealed against dust and powerful water jets, ensuring longevity in coastal and tropical climates.
• ISO Quality Standards: Manufactured under strict quality control to ensure repeatable RF performance in tactical deployments.

EU, RoHS, WEEE & REACH Compliance

• RoHS (Restriction of Hazardous Substances): 100% compliant with EU Directive 2011/65/EU, ensuring the absence of lead, mercury, cadmium, and other restricted materials.
• REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals): All materials used in the fiberglass radome and epoxy coatings are registered and certified safe for human health and environmental impact.
• WEEE Directive: Supports high-end lifecycle management with a design focused on the recyclability of the 6061T6 aluminum reflector and high-purity copper components.

Key Advantages: AH-280 Tactical Superiority

• Ultimate Multipath Immunity: The Circular Polarization (CP) technology inherently rejects reflected signals, providing an ultra-stable link in high-reflection environments like urban canyons, metallic corridors, and coastal zones where linear antennas suffer from signal fading.
• Broadband Single-Antenna Solution: A single AH-280 covers the entire 240–325 MHz spectrum, replacing the need for multiple narrowband Yagi antennas. This reduces the logistical footprint and simplifies the RF architecture of tactical ground stations.
• Superior Power Density: While rated at a standard 500 Watts, the industrial-grade build quality allows for factory upgrades to 1KW, 1.5KW, and 2KW, making it one of the most powerful directional UHF apertures in its class for long-range satellite tracking.
• Precision Acquisition: The 50-degree Half Power Beamwidth (HPBW) provides a generous "window" for satellite acquisition, making it easier to maintain a lock on moving tactical satellites or aerial assets even during high-vibration events.
• Zero Field Tuning: Fully factory-tuned and moisture-sealed, the AH-280 is a "plug-and-play" asset that requires no manual calibration or impedance matching in the field.

Radome Feature Advantages

• Aerodynamic Cylindrical Profile: The 400 mm diameter cylindrical radome minimizes wind drag (200 Km/Hr rating) and prevents the "sail effect," ensuring the antenna remains bore-sighted on the target during high-velocity storms.
• Ice and Snow Shedding: The smooth fiberglass exterior prevents the accumulation of ice and snow, which typically detunes or damages exposed radiating elements in arctic or high-altitude theaters.
• Corrosion-Proof Shielding: Coated with an epoxy-based electrostatic powder finish, the radome is immune to the corrosive effects of salt spray, acid rain, and UV radiation, making it ideal for permanent coastal or naval installations.
• Mechanical Integrity: The radome serves as a rigid structural skeleton, securing the heavy-duty copper winding in a fixed geometry to prevent RF inter-modulation caused by mechanical vibration or wind-induced swaying.
• High RF Transparency: Engineered from specialized high-strength fiberglass, the enclosure ensures near-zero signal attenuation, allowing the full 12 dBic gain to be projected without loss.

Key Applications

• Military SATCOM Ground Stations: High-reliability Ground-to-Space links for UHF satellite constellations, providing a primary communication path for tactical theater commands.
• Electronic Warfare (EW) & Jamming: Strategic Electronic Attack (EA) against UHF data links. The high-power capacity allows for the saturation of enemy receivers at significant standoff distances.
• Flight Termination Systems (FTS): Reliable directional command-to-destruct links for aerospace, missile testing, and range safety operations in the 400 MHz window.
• SIGINT & Spectrum Surveillance: Precision interception and triangulation of weak, long-range UHF telemetry and rogue tactical emitters.
• UAV Command & Control: Directional command links for long-range tactical drones and aerial platforms requiring high link margins and interference rejection.