Ian Waugh - A Mariner\'s Guide to Marine Communications

Whip antennas usually come in two or three sections, joined together by screw connections at a height that is not easily accessi ...

Antenna radiation hazard In addition to Radio Frequency (RF) burns caused by touching the antenna element and/ or connections at ...

weakest , , , , , , , , " strongest strongest 1 - - - - - - - - - - - - - - - - - - --- -- ------ -- - --~ Figure Z5 (aJ The ele ...

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conditions, because the lower layers have gone and those frequencies penetrate further before being refracted. 6 Signals at 16MH ...

Chapter 8 Mobile Satellite Installations THIS CHAPTER COVERS THE VARIOUS INMARSAT SATELLITE SERVICES that are used for GMDSS pur ...

exchange, connecting calls from ships to shore subscribers and from shore to ship. (Land Earth Station means a station, on land, ...

Network Coordination Station (NCS) The role of the NCS is to allocate a working channel to ships and to LESs, dynamically, call- ...

Inmarsat services The Inmarsat network offers a range of services including SafetyNET and FleetNET; Ship-Shore distress communic ...

Satellite propagation Inmarsat services all use direct wave (line of sight) propagation, so your ship's Inmarsat antenna must ha ...

Inmarsat-C operation and controls The main components (and associated controls) of an Inmarsat-C installation are: 1 The antenna ...

4 The Visual Display Unit (VDU): may be a separate unit or part of a combined communications unit. Keyboard: the main input devi ...

you need to LOGIN to a satellite. This will occur automatically when you switch-on your equipment - but the equipment may not lo ...

Address SPecial Access Code Function/reference Maritime Assistance :~9 Medical Advice 32 Medical Assistance 38 Met Reports 41 ad ...

Reports can be sent to a normal address from your address book, or they can be sent to a particular Data Network Identity (DNID) ...

The radiated power, and the transmitter radio (carrier) frequency. The distance a person is from the antenna at the time of tran ...

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telephone/telex connection and sounds an alarm when a Distress Priority call/message is received from an MRCC. A less sophistica ...

Inmarsat-A/lnmarsat-B Telephone/Telex Procedures Telephone and telex operating procedures for routine communications are covered ...

You are moving out of the footprint of your chosen satellite. Your chosen satellite comes in shadow of buildings or terrai ...