AC4990TXF

Overview

The AC4990TXF is a high-performance GNSS antenna featuring Accutenna® 4 technology for exceptional precision across all major constellations and frequency bands. It supports:

• GPS/QZSS: L1, L2, L5, QZSS-L6
• GLONASS: G1, G2, G3
• Galileo: E1, E5a, E5b, E6
• BeiDou: B1, B2, B2a, B3
• NavIC: L5
• SBAS: WAAS (North America), EGNOS (Europe), MSAS (Japan), GAGAN (India)
• L-band Corrections

Advanced Design for Superior Accuracy

The AC4990TXF incorporates a precision-tuned twin circular quad-feed stacked patch element. Signals from four orthogonal feeds are combined through a feed network, amplified by a wideband LNA, then band-split for narrow filtering and further amplification before recombination at the output.

This quad-feed architecture delivers:

• Excellent axial ratio for multipath mitigation
• Phase center variation tightly grouped within ≤ 2 mm from zenith to 15° above horizon

Ideal for:

• Surveying
• Autonomous vehicle navigation
• Precision agriculture
• Any application where accuracy is critical

Engineered for Interference Mitigation

As the RF spectrum grows more congested with LTE and emerging signals, GNSS performance faces new challenges. Interference sources include:

• Ligado signals (1525–1536 MHz) in North America
• LTE Band 32 (1452–1496 MHz) in Europe
• LTE Bands 11 & 21 (1476–1511 MHz) in Japan
• Inmarsat uplink (1626.5–1660.5 MHz)

The AC4990TXF leverages Calian XF filtering technology to block out-of-band signals, including Ligado and LTE, preventing antenna saturation and ensuring optimal GNSS receiver performance.

Built for Durability

The antenna features:

• Rugged through-hole metallic base
• Weatherproof housing for permanent outdoor installations