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Navtex Navigational Alert Receiver

Navtex Navigational Alert Receiver

 

Navtex is a maritime teletype system belonging to the Global Maritime Distress and Safety System (GMDSS).

It is used for transmitting navigational alarms, weather alarms and emergency safety, search and rescue information. Shore

Important information on navigational safety is gathered by shore-based authorities and broadcast to ships in the main maritime areas.

The relevant authorities on shore gather important information on navigational safety into coastal radio stations and broadcast it to ships in major maritime areas.

navtex2

The international common frequency used by Navtex system is 518KHz, while some regions use 490KHz and 4209.5 KHz.

The international common frequency used by Navtex system is 518 KHz, while some regions use 490 KHz and 4209.5 KHz, and 486 KHz is the exclusive frequency for Chinese Navtex.

Navtex signals are broadcasted using the FEC method of Narrow Band Direct Printed Telegraph (NBDP), and the modulation type is F1B (2FB).

The Navtex signal is broadcasted by FEC method of Narrow Band Direct Printed Telegraph (NBDP), modulation type is F1B (2FSK, 100bps), and it broadcasts maritime safety information to the coastal vessels.

The signal coverage of each shore station is about 200 nautical miles. Vessels equipped with Navtex receivers will

Vessels installed with Navtex receivers will automatically receive and display (or print) the corresponding maritime safety messages.

Figure 2 Navtex messages displayed on a Navtex receiver.

The Navtex system divides the globe into 16 regions, each of which contains a number of shore stations.

The Navtex system divides the world into 16 regions, each region contains a number of shore stations, which transmit Navtex messages in the corresponding time slots according to the protocol, usually every 4h for each station.

In general, each station transmits every 4h and one transmission lasts for 10min, which ensures that there is only one Navtex message for each time slot in any region.

This ensures that there is only one station transmitting in each time slot in any one area, effectively avoiding interference between stations.

navtex receiver

NAVTEX Receiver product .

Xinuo  NT-7001 ,

Sealink ,HX-2600

CNFT : FT-7600

Chiyang :  NTX-100B

navtex 1    HX-2600  Sealink    FT 7600 pic6                  NTX 100 navtex receiver 500 2

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