NSPL-500 Antenna Splitter

The Navico NSPL-500 antenna splitter is a compact and lightweight solution designed to allow an AIS transponder and a VHF radio to share a single antenna. This device eliminates the need to install a second VHF antenna, saving space, reducing weight and windage—particularly on sailboats. Its robust design and performance make it a preferred choice for new installations or refits.

Performance and Reliability

The NSPL-500 stands out for its very low insertion loss, a critical factor to avoid degrading VHF and AIS performance. In transmit mode, the loss is typically 1 dB, preserving the range of your communications. In receive mode, the loss is zero (0 dB), ensuring maximum sensitivity for receiving AIS targets and VHF calls. The splitter features a "failsafe" design that gives absolute priority to the VHF radio; in the event of a splitter power failure, the VHF remains connected to the antenna to maintain safety communications. Its very low power consumption, under 150 mA at 12 VDC, minimizes the impact on the vessel’s energy budget.

Installation and Integration

Measuring 152 x 98 x 52 mm and weighing 260 g, the NSPL-500 can be discreetly installed in any technical space. It is compatible with 9.6 to 31.2 VDC power, making it suitable for both 12V and 24V systems. The housing is fully waterproof to IP67 standards, providing total protection against dust and immersion. The device has dedicated connectors for the antenna, VHF radio, AIS transponder (Class B compatible up to 12.5 W), and even an output for an FM radio receiver. LED indicators display power status and transmit activity for both VHF and AIS.