The Tallysman TW164 is a professional-grade full GNSS band signal splitter that connects one antenna 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.
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
Allows up to four GNSS receivers to share a single antenna
Fits in-line with antenna cable
Suitable for harsh environments
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 TW164 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 (3.0 V – 12.5 V). 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 TW164 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 TW164 will provide the receiver powering the antenna with a current draw lower than 2 mA, indicating an antenna fault.
The TW164 offers the best in-class performance in terms of noise figure, isolation, and linearity. In addition, it is packaged in a corrosion-protected housing made of military-grade aluminum (6061-T6), which is robust, compact, and lightweight. The splitter has also passed the IP67 water ingression test.
The TW164 is available with either TNC or type-N connectors and offers standard gain to compensate for signal-splitting loss.