QHA-350

The QHA-350 engineering strategy focuses on its optimized performance in the 300–400 MHz military UHF band, specifically targeting TETRA, public safety, and tactical ground-to-air communications. Its Quadrifilar Helix (QHA) design is highlighted as the professional solution for maintaining a constant signal lock in high-mobility environments.

Logistics: Streamlined Tactical Deployment

The QHA-350 is engineered for logistical efficiency and rapid field integration. Arriving factory-calibrated and fully assembled, it eliminates the need for complex field tuning or adjustments. Its compact, lightweight footprint allows for easy handling and cost-effective shipping, making it an ideal choice for rapid-response units. The antenna features a standard mounting flange designed for immediate installation on fixed masts or tactical platforms, ensuring a "plug-and-play" experience for mission-critical surveillance, scanning, and monitoring operations.

Durability: All-Weather Military-Grade Construction

Built to survive the most punishing environmental conditions, the QHA-350 is encased in a high-strength fiberglass radome. This enclosure provides a high-transparency path for RF signals while offering the structural integrity needed to withstand high wind loads. The cylindrical, aerodynamic profile minimizes the effect of ice formation and wind drag, ensuring stable performance in arctic or coastal regions. Internal components utilize high-class copper alloy and marine-grade stainless steel hardware, providing total immunity to salt spray, UV radiation, and corrosive gases.

Efficiency: Circular Polarized Superiority for UHF

The QHA-350 provides a definitive edge in signal reliability through its Circularly Polarized (RHCP or LHCP) radiation pattern. By twisting two pairs of vertical loop radiating elements into a helix, it achieves a wide elevation beamwidth and true omni-directional properties.

This geometry is uniquely efficient for Ground-to-Air communication, as it effectively eliminates signal fading and cross-polarization losses encountered when aircraft bank or roll. Utilizing a specialized "Teflon Dielectric Transmission Line" technique, the antenna supports high-power handling while maintaining a smooth VSWR and a consistent 3 dBi gain across the entire 300–400 MHz band.

Technical Features

• Optimized UHF Coverage: High-efficiency, broadband performance across the 300–400 MHz frequency range.
• Circular Polarization Excellence: Available in RHCP or LHCP to reject multipath interference and maintain signal locks during target movement.
• Quadrifilar Helix Geometry: Provides hemispherical coverage with a wide elevation beamwidth, perfect for tracking aerial targets and satellites.
• High-Power Handling: Features a specialized Teflon Dielectric system to support high-power transmitting and jamming applications.
• Rugged Fiberglass Radome: High-strength, UV-resistant housing designed for low wind loading and maximum RF transparency.
• Weatherproof Termination: RF termination is strategically placed below the mounting flange for total protection against moisture and dust.
• Superior Materials: Constructed using high-class copper alloy and stainless-steel hardware for total corrosion resistance.
• Zero Field Maintenance: Arrives factory-tuned and requires no field adjustments or periodic tuning for mission readiness.
• Versatile Applications: Highly suitable for TETRA bands, scanning, surveillance, monitoring, and high-power jamming.
• Omni-Directional Stability: Provides a true 360-degree horizontal radiation pattern with consistent gain across the band.