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AIS transceivers use two different frequencies, VHF maritime channels 87B (161.975 MHz) and 88B (162.025 MHz), and use 9.6 kbit/s Gaussian minimum shift keying (GMSK) modulation over 25 kHz channels using the high-level data link control (HDLC) packet protocol. Although only one radio channel is necessary, each station transmits and receives ...
A ready-to-use module is a complete system with a transceiver, and optionally an MCU and antenna on a printed circuit board. While most of the modules in this list are Zigbee , Thread , ISA100.11a , or WirelessHART modules, some don't contain enough flash memory to implement a Zigbee stack and instead run plain 802.15.4 protocol, sometimes with ...
A operator of a global network of low orbit AIS satellites which use technology such as ABSEA to receive transmissions from Class B and Identifier type AIS VMS transceivers. Thrane & Thrane Dedicated computer with voice and email Inmarsat-C Geosynchronous satellite Honeywell or Skywave: Low-cost, small transceivers with integrated GPS Inmarsat-D+
This contrasts to the Automatic identification system (AIS) used globally on ships that transmit continuously. A short post-transmission message is sent by the radio with the vessel identity and is in the form of an encoded call sign or Maritime Mobile Service Identity , starting with number "9" and the three country-specific maritime ...
A communications satellite’s channels are called transponders because each is a separate transceiver or repeater.With digital video data compression and multiplexing, several video and audio channels may travel through a single transponder on a single wideband carrier.
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.