Tallysman AJ977XF AntiJam Triple Band GNSS Antenna

Tallysman AJ977XF Anti-Jam Triple-Band GNSS Antenna

The housed AJ977XF triple-band GNSS antenna with anti-jam technology from Tallysman offers a novel approach to interference and GNSS jamming mitigation.



The AJ977XF anti-jam triple-band GNSS antenna supports GPS/QZSSL1/L2/L5, GLONASS-G1/G2/G3, Galileo-E1/E5a/E5b, BeiDou-B1/B2/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 will mitigate a 600 Watt jamming signal broadcast at an elevation angle of 10°, 100m or greater away from the AJ977XF antenna.

The combination of Tallysman’s low elevation angle nulling radiation pattern, and eXtended Filtering (deep filters and high IP3 (prevents saturation in the presence of noise)) technologies provides a one-two punch to jamming and radio frequency 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.

Tallysman’s eXtended Filter (XF) antenna technology has been designed to mitigate out-of-band signals and prevent GNSS antenna saturation. 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. Tallysman’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 AJ977XF antenna is ideal for all mission-critical positioning, navigation and timing applications.


  • Great axial ratio (1.0 dB typ.)
  • Low LNA noise (2.5 dB typ.)
  • High-rejection XF Filtering
  • High-gain LNA (40 dB typ.)
  • Low current (26 mA typ.)
  • Wide voltage input range (2.5 to 16 VDC)
  • ESD circuit protection (15 kV)
  • IP67 weather-proof housing
  • RoHS and REACH compliant
  • 20dB attenuation at 0-15° Elevation


  • 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


  • Mission-critical global positioning
  • Timing applications
  • Law enforcement and public safety


Calian GNSS (formerly Tallysman Wireless) offers a warranty of 1-3 years on all of it’s products. The warranty ensures that the products are free from defects of materials or workmanship and conform to Calian’s specifications under normal use. Embedded antennas are covered by a one (1) year standard warranty. All housed antennas and accessories (inline amplifiers, splitters, and bias tees) manufactured after January 1, 2020 are covered by a three-year warranty. The warranty is covered in more detail on the Calian GNSS Warranty page.

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Calian GNSS and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The AJ977XF anti-jam triple-band GNSS antenna is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.