Tallysman TW165 1-to-4 Port Smart Power GNSS Signal Splitter

Tallysman TW165 1-to-4 Port Smart Power GNSS Signal Splitter

The TW165 is a professional-grade full GNSS band signal splitter that connects one antenna up to four receivers, and supports GPS/QZSS L1/L2/L5, QZSS L6, GLONASS G1/G2/G3, BeiDou B1/B2/B2a/B3, Galileo E1/E5a/E5b/E6, NavIC L5 and L-Band correction services.



GNSS has become a critical component in safety, security, timing, and infrastructure applications, all of which require very high availability. As a result, resilient fault-tolerant components are essential to avoid service interruptions.

The design of first-generation GNSS signal splitters suffered from a single point of failure: only one attached receiver powered the splitter and the antenna. If this receiver failed or was unplugged, all attached receivers also failed.

Tallysman’s current-generation TW165 Smart Power GNSS signal splitter provides two additional key features:

First, it accepts power from all attached GNSS receivers and selects power from a receiver using the following protocol. Port #1 is given priority if its voltage is within the specified range (3.3 – 12.5 VDC). However, if port #1’s receiver is disconnected or if its receiver power goes below the under-voltage or above the over-voltage specification, the TW165 will switch to the next port in numerical order, as long as its power and voltage are within the expected range. The switching and port selection is, therefore, deterministic.

Second, if the antenna fails and does not draw current, the TW165 will provide all connectors with a current draw lower than 1 mA, indicating an antenna fault.

The TW165 offers the best in-class performance in terms of noise figure, isolation, and linearity. In addition, it is packaged in a robust, compact, lightweight, and water-proof (IP67) corrosion-protected aluminum housing.

The TW165 is available with either TNC or type-N connectors and offers 10 dB gain over the splitting-loss.


  • GNSS signal distribution
  • GNSS receiver testing
  • High-availability applications
  • Network and infrastructure timing


  • Accepts power from all attached receivers
  • Automatically switches on power failure of one receiver
  • Antenna failure detection/indication
  • Rugged military-grade aluminum enclosure
  • Amplification to compensate for signal-splitting loss
  • Very low noise figure
  • IP67-compliant


  • Allows up to four GNSS receivers to share a single antenna
  • Fits in-line with antenna cable
  • Robust package
  • Ideal for harsh environments


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 TW165 1-to-4 port smart power GNSS signal splitter 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.