The AS300 Antenna Splitter from Comar Systems is designed to allow an AIS Class ‘B’ Transponder or an AIS Receiver to share the main VHF Antenna used by the VHF Radiotelephone, which removes the need and expense of installing an additional VHF antenna. Comar Antenna Splitters are built to the highest standards to ensure that the performance of the connected AIS and VHF Radio equipment is not compromised.


  • Allows use of a single VHF Antenna installation shared between AIS and VHF Radiotelephone
  • Automatic Routing of AIS or VHF Transmissions
  • VHF transmissions have priority over AIS
  • Works with an AIS Transponder (Class ‘B’) or AIS Receiver
  • FM Antenna Connection for receiving Public Radio Broadcasts
  • Rugged, Marinised Housing
  • 12 V dc

Technical Specifications


  • Weight: 600 g
  • Dimensions: L 135 x W 128 x H 50 mm (excl. connectors & bracket)
  • Mounting: To flat surface with supplied trunnion mount
  • Connections: Power: 2-core captive cable, 1 m
  • Antenna: SO239 UHF Connector
  • GPS Antenna: TNC Connector
  • Data In/Out: 9-pin D-sub Connector
  • NMEA 2000: 5-pin; 2x Data; 2x 12 V dc Power; 1x Shield
  • USB: USB 2.0 Type B Connector
  • Construction: Extruded aluminium alloy
  • Finish: Black paint


  • Power Supply: 12 V dc (9.6 – 15.6 V dc); 500 mA; 4 W nominal
  • Peak Power: 2 A
  • Data Output: NMEA 0183: 38,400 and 4,800 Baud


  • VHF Receiver: Transmitter x1; Receiver x2
  • VHF Antenna Impedance: 50 Ω
  • Frequency Range: 156.025 – 162.025 MHz in 25 kHz steps
  • Channel Bandwidth: 25 kHz
  • Channel Steps: 25 kHz
  • Display: Discrete Indicator LEDs
  • Data Received:
  • Class A and Class B AIS Transmissions
  • Safety messages
  • Aids to Navigation
  • Data Transmitted: Name of Vessel
  • MMSI Number
  • Position
  • Speed (SOG)
  • Course (COG)
  • Type of Vessel
  • Call Sign
  • Heading
  • Vessel Dimensions
  • GPS Antenna Impedance: 50 Ω
  • Indicators: On, TX, RX, Status, TX Timeout, Error, TX Off


  • IP Rating: IP40
  • Operating temp: -15°C to +55°C
  • Compass: Safe Distance 50 cm


  • Conforms with: IEC 62287-1 Class B; EN-60945; IEC 61162-1; IEC 61108-1; EN 301 843-1 v2.1; EN 50383; EN 60950-1; ITU-RM.1371-1; CE European; BSH Germany


  • Supplied: CSB200 Transponder; trunnion bracket; power, data and programming cables; installation software
  • Required: GPS Receive Antenna AG100 for AIS re-transmission of Vessel Position
  • Required: AIS Antenna


 AS200 Datasheet