The AS350 Antenna Splitter from Comar Systems allows an AIS Class B transponder or AIS receiver to share the vessel’s main VHF antenna with the onboard VHF radiotelephone. This eliminates the need and cost of installing a separate VHF antenna for AIS equipment.

The AS350 automatically routes signals to ensure reliable operation of both AIS and VHF systems, giving priority to VHF transmissions. Housed in a compact, durable ABS enclosure with carbon-reinforced connector panels, it combines strength with a premium, technical finish while maintaining the performance of connected AIS and VHF radio equipment.

FEATURE

Suitable for AIS Class B transponders and AIS receivers
Enables AIS and VHF to share a single antenna installation
Automatic switching between AIS and VHF transmissions, with VHF priority
Rugged ABS housing with carbon-reinforced side plates for durability
Operates on 12 V DC supply
Quick and easy to install

APPLICATIONS

Enables AIS operation using an existing VHF antenna
Reduces cost and complexity by avoiding a second antenna installation

Technical Specification

Specification	Details
Part Number / SKU	AS350
Model	Comar AS350 Active AIS / VHF Antenna Splitter
Primary Application	Antenna Sharing for AIS Transponders, VHF Radios, and FM Receivers
Operating Frequency Range	156 MHz to 163 MHz (VHF Marine Band)
Insertion Loss	0 dB (Active amplification maintains standard antenna gain)
VHF Priority & Fail-Safe	Auto-sensing VHF TX priority (Full fail-safe bypass to VHF radio on power loss)
Supply Voltage	12 V DC to 24 V DC (9.6 V DC to 31.2 V DC)
Power Consumption	< 1.5 W (120 mA @ 12 V DC)
RF Connectors	• VHF Antenna: SO239 (PL259 Compatible) • VHF Radio Port: SO239 (PL259 Compatible) • AIS Port: BNC Female • FM Radio Port: BNC Female / Motorola Adapter
Country of Origin	United Kingdom (UK)
Operating Temperature	-15°C to +55°C (5°F to 131°F)
Waterproof Rating	IP40 (Indoor / Below-Deck Installation)
Dimensions & Weight	140 mm x 120 mm x 37 mm; 260 g