Tallysman expands TW3900 Accutenna antennas with eXtended filtering

The TW3967-XF antenna. (Photo: Tallysman)

Tallysman Wireless has added new eXtended Filtering (XF) functions to the Accuntena precision antennas of the TW3900 series. Tallysman developed the XF feature to reduce interference from all near-band signals and ensure that the antenna is delivering the purest GNSS signals.

Tallysmans TW3972XF, TW3972EXF, TW3972LGXF, TW3967XF and TW3967LGXF are three-band antennas that support GPS / QZSS (L1 / L2 / L5), GLONASS (G1 / G2 / G3), Galileo (E1 / E5ab), BeiDou (B1 / B2.) / B2a), NavIC L5 and L-band correction services.

The radio frequency spectrum is overloaded worldwide, as many new LTE bands have been activated and their signals or harmonic frequencies can affect GNSS antennas and receivers. In North America, the proposed Ligado service, which will be broadcast in the 1526-1536 MHz band, may affect GNSS antennas receiving space-based L-band correction service signals (1539-1559 MHz).

The TW3972-XF antenna. (Photo: Tallysman)

New LTE signals in Europe [Band 32 (1452–1496 MHz)] and Japan [Bands 11 and 21 (1476–1511 MHz)] also affected the GNSS signals. Finally, the Inmarsat satellite communications uplink (1626.5–1660.5 MHz) often used on ocean-going vessels can also affect nearby GNSS antennas.

Tallysman’s custom XF filtering has been tested to attenuate new (Europe and Japan) and existing LTE signals so that the XF antennas can produce clean and pure GNSS radio frequency data. Deep XF filter technology is applied to all Tallysman product lines.

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