QHA-1113

The QHA-1113 design strategy focuses on its role as a High-Power L-Band Jammer and Monitoring Antenna, specifically optimized for the 1100–1300 MHz spectrum. This range is critical for disrupting or protecting GPS L2, GLONASS G2/G3, and Galileo E5/E6 bands. By highlighting its 500W power handling and RHCP circular polarization, we position it as an essential component for mobile electronic warfare (EW) and tactical signal suppression.

Logistics: Tactical Superiority in a Compact Footprint

The QHA-1113 is engineered for rapid integration into high-mobility tactical environments. With an overall length of just 200 mm, its compact and lightweight design allows for easy handling and efficient shipping, ensuring a minimal RF signature on mobile platforms. Arriving factory-calibrated with zero field tuning required, it features a standard NATO 4-hole mounting interface, making it a "plug-and-play" solution for armored vehicles, tactical ground stations, and electronic warfare suites.

Durability: All-Weather Resilience for Combat Zones

Built to endure the most punishing environmental conditions, the QHA-1113 is encased in a high-impact, UV-resistant ABS radome. The internal copper alloy radiating elements are precision-twisted into a helix to ensure mechanical stability in high-vibration vehicular environments. The cylindrical profile is specifically optimized for low wind loading (up to 200 Km/Hr) and the prevention of ice formation, ensuring stable operation from -35°C to +70°C. With marine-grade stainless steel hardware and a 6063T6 aluminum base, the antenna remains immune to corrosion in humid or saline coastal environments.

Efficiency: 500W High-Power Circular Polarization

The QHA-1113 provides a definitive edge in L-band signal dominance through its Right Hand Circularly Polarized (RHCP) radiation pattern. By utilizing a unique quadrifilar helix geometry, it achieves a wide 120-degree vertical beamwidth. This creates a hemispherical "dome" of coverage, ensuring constant signal suppression from the horizon to the zenith—essential for Ground-to-Air jamming. Utilizing a specialized "Teflon Dielectric Transmission Line" technique, the antenna safely manages 500 Watts of RF power, maintaining a smooth VSWR across the entire 1100–1300 MHz band.

Technical Features

• Optimized L-Band Frequency: Continuous high-efficiency performance across the 1100–1300 MHz range (Lower L-Band).
• Extreme Power Handling: Rated for 500 Watts of RF power, ideal for high-intensity broadband jamming and long-range transmission.
• RHCP Circular Polarization: Native RHCP sense ensures 100% polarization coupling with GPS L2 and other satellite navigation signals.
• Hemispherical Coverage: 120-degree vertical beamwidth provides mission-critical signal locks from the horizon to directly overhead.
• Teflon Dielectric Technology: Ensures low-loss power transfer and high-heat stability for continuous high-duty-cycle jamming.
• Ruggedized ABS Radome: High-strength, RF-transparent housing designed for extreme wind resistance and minimal ice accumulation.
• NATO Standard Integration: Features a NATO 4-hole flange for rapid installation on military and armored platforms.
• Marine-Grade Build: Constructed using 6063T6 military-grade aluminum and stainless steel fasteners for superior corrosion resistance.
• Weatherproof Termination: Fitted with an N-Female connector protected below the mounting flange for 100% moisture sealing.
• Maintenance-Free Design: Rugged, fully enclosed elements require no field adjustments or periodic tuning for mission readiness.

Lower L-Band Jamming Guide: GPS L2 & GLONASS G2 Suppression

In tactical electronic warfare, neutralizing the Lower L-Band (1100–1300 MHz) is critical for degrading high-precision GNSS receivers that rely on multiple frequencies to correct ionospheric errors. The QHA-1113 provides a specialized "jamming footprint" designed to saturate this specific spectrum.

1. Forced Polarization Coupling (L2 Target)

Most military and high-end civilian GNSS receivers utilize the GPS L2 (1227.60 MHz) signal for encrypted P(Y) code and C/A code tracking. These signals are natively Right Hand Circularly Polarized (RHCP).

• The Jamming Advantage: By transmitting a native RHCP jamming wave, the QHA-1113 ensures a perfect 1:1 polarization match with the target’s receiving antenna. This prevents the "polarization mismatch loss" (which can be 3dB to 20dB) that occurs when using standard linear jammers, ensuring every watt of your 500W output is directed into the target's circuitry.

2. Creating a "Zenith-Locked" Exclusion Zone

UAVs and guided munitions often fly at high altitudes to stay above the "null" of standard ground jammers.

• The QHA-1113 Advantage: The 120-degree vertical beamwidth eliminates the traditional "cone of silence" directly above the antenna. It creates a hemispherical "exclusion dome" that denies GPS L2 locks to any aerial threat passing from the horizon to 90° (directly overhead). This makes it a superior choice for protecting fixed assets and mobile convoys from top-down threats.

3. Overcoming "Signal Shielding" via Multipath

Lower L-band signals reflect easily off the ground and metallic vehicle bodies. These reflections can sometimes create "pockets" of signal where a linear jammer cannot reach.

• The Penetration Benefit: The rotating nature of the circular wave from the QHA-1113 "fills" the environment more uniformly. It reduces the chance of a target receiver finding a "null spot" in the jamming field caused by ground reflections, ensuring the interference remains dominant across the entire operational area.

4. High-Duty Cycle Thermal Management

Jamming is a power-intensive operation that creates significant heat stress on the antenna's internal transmission lines.

• Teflon Dielectric Reliability: The QHA-1113 uses a specialized Teflon Dielectric system. Unlike standard plastics, Teflon maintains its electrical properties under high temperatures and high voltage. This prevents "VSWR drift" during long-duration jamming cycles, protecting your Power Amplifier (PA) from damage while maintaining a constant 500W output.

Tactical Deployment Checklist

• Frequency Alignment: Ensure your jammer's sweep is centered around 1227 MHz (GPS L2) and 1246 MHz (GLONASS G2) for maximum effectiveness.
• Grounding for Static: The L-band is prone to static build-up. Ensure the 6063T6 Aluminum base is securely grounded to the vehicle chassis to prevent ESD (Electrostatic Discharge) from affecting the jammer's RF output.
• Array Spacing: If using multiple QHA-1113 antennas for an array, space them at least 250mm apart to prevent mutual coupling and pattern distortion.