The AJ977XF+ supports GPS/QZSS-L1/L2/L5, GLONASS-G1/G2/G3, Galileo-E1/E5a/E5b, BeiDou-B1/B2b/B2a, and NavIC-L5 frequency bands, including the satellite-based augmentation system (SBAS) available in the region of operation [WAAS (North America), EGNOS (Europe), MSAS (Japan), or GAGAN (India)].

The AJ977XF+ Anti Jam antenna is designed to mitigate interference and jamming signals broadcast from near ground-based transmitters. The radiation pattern of the Low Elevation Angle Nulling Antenna (LEANA) provides 20 dB (typical) wideband suppression for all GNSS band signals received at an elevation angle of 0° through to approximately 15°. This level of attenuation was demonstrated to mitigate jamming signal broadcasts at an elevation angle of 10° such that the AJ977XF+ can be up to 10 times closer, compared to a standard HC977XF helical antenna, to the source of interference without being jammed. The combination of Calian’s low elevation angle nulling radiation pattern and eXtended Filtering (deep filtering and high linearity) technologies provides a one-two punch to jamming and RF noise. At the same time the AJ977XF+’s radiation pattern above 20° elevation angle provides excellent gain and a phase center that supports accurate and precise positioning.

Calian’s eXtended Filtering+ (XF+) technology features > 80 dB of out-of-band rejection from 700MHz to 2500MHz and separates the LNA’s upper and lower signal amplification channels; if one channel is jammed the other remains usable. In North America, Ligado signals at 1525 – 1536 MHz can especially impact GNSS antennas that support space-based L-band correction services (1539 – 1559 MHz). New LTE signals in Europe [Band 32 (1452 – 1496 MHz)] and Japan [Bands 11 and 21 (1476 – 1511 MHz)] have also been observed to interfere with GNSS signals. In addition, Inmarsat satellite communication (uplink: 1626.5 -1660.5 MHz) can also affect GNSS signals. Calian’s custom XF filtering mitigates all existing signals and new Ligado and LTE signals, enabling the antennas and attached GNSS receivers to perform optimally.

The Tallysman AJ977XF+ antenna is ideal for all mission-critical positioning, navigation and timing applications.

Why Choose the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna?

• Great axial ratio (1.0 dB typ.)

• Low LNA noise (2.5 dB typ.)

• High-rejection XF+ Filtering

• High-gain LNA (40 dB typ.)

• Wide voltage input range (2.5 to 16 VDC)

• ESD circuit protection (15 kV)

• IP67 weather-proof housing

• RoHS and REACH compliant

• 20 dB attenuation at 0-15° Elevation

Benefits of the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna

• Operates under ground-based jamming

• Circular polarisation throughout the full bandwidth

• Superior multipath signal rejection

• Excellent signal-to-noise ratio

• Excellent out-of-band signal rejection

• Increased system accuracy

• Ideal for noisy RF environments

What Is the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna Used For?

• Mission-critical global positioning

• Timing applications

• Law enforcement and public safety

Frequently Asked Questions

What is the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna?

The AJ977XF+ supports GPS/QZSS-L1/L2/L5, GLONASS-G1/G2/G3, Galileo-E1/E5a/E5b, BeiDou-B1/B2b/B2a, and NavIC-L5 frequency bands, including the satellite-based augmentation system (SBAS) available in the region of operation [WAAS (North America), EGNOS (Europe), MSAS (Japan), or GAGAN (India)].

Where is the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna available?

The AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna is available through Leo Drive in the following region: Turkey. For other regions, please contact Leo Drive.

How can I get the datasheet and technical specifications for the AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna?

The manufacturer’s datasheet is attached to this page and carries the full specification table, including gain and axial ratio per band. Please contact Leo Drive for ordering options and integration support.

Explore More at Leo Drive

The AJ977XF+ Anti-Jamming Multi-Constellation Triple-Band Antenna is part of the GNSS Antennas range at Leo Drive. Browse all autonomous vehicle sensors and components, or talk to our engineering team about integration in your project.