Tallysman TW3500

Tallysman TW3500 Permanent Mount Globalstar STU Antenna

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The TW3500 by Tallysman Wireless is a professional grade, permanent mount, passive left hand circularly polarised antenna for the 1610 to 1620 MHz frequency band, specifically designed to maximise the performance of the Globalstar STU (Simplex Transmit Unit) Modem.



The TW3500 features a high performance dual-feed patch element that provides great axial ratio (3 dB max) over the entire Globalstar frequency band, thus signals at the band edges remain truly circular, unlike the response of single feed antennas.

The TW3500 is housed in a permanent mount industrial-grade weather-proof enclosure and comes with a TNC Jack (female) connector, allowing for the Globalstar modem to be mounted out of the elements and reach, and still providing excellent Globalstar signal coverage.


  • Simplex Transmit Unit (STU) Applications
  • Sea & Land Container Tracking
  • Military & Security
  • Fleet Management & Asset Tracking
  • Marine & Avionics Systems
  • Law Enforcement & Public Safety


  • Custom high gain, 4.25 dBic dual-feed patch
  • Great axial ratio, 3 dB over full bandwidth
  • 15 KV ESD circuit protection
  • IP67 weather proof housing
  • Robust Industrial grade enclosure
  • Surface, bracket or mast mount


  • Excellent circular polarized signal transmission
  • Industrial temperature range
  • Rugged design
  • Ideal for harsh environments
  • RoHS compliant
  • Remote STU antenna

Ordering Information

Legacy Part Number:

  • TW3500 – Globalstar antenna, TNC Female – 32-3500-0

As a result of a growing product portfolio, Tallysman has rationalized its part number system. No changes have been
made to the mechanical or electrical properties of these products. Where administratively possible, please use the following part numbers.

  • TW3500 – Globalstar antenna – 33-3500-xx-yy-zzzz

Where xx = connector type, yy = shape and colour of radome and zzzz = cable length in mm (where applicable)