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INTRODUCTION
The Target navtex V2.0 is a dual frequency navtex receiver allowing
reception of either the navtex national (490kHz) service or the
international (518kHz) service. Facilities are provided to program
the receiver for both stations and messages on each of the two
frequencies.
The receiver is simple to use with all instructions clearly displayed
on the screen.
A compact stubby antenna is supplied with the receiver.
Whilst the receiver is designed to operate from the vessel's 12 volt
system, it can be powered by domestic mains using a regulated 12
volt power supply (not a battery charger). A custom power supply
is available from the Nasa Marine spares department. When used
in a domestic environment it is important that the negative supply
wire is connected to a good ground (e.g. Mains ground or a
suitable water pipe) to avoid interference.
NAVTEX Transmissions
NAVTEX is information broadcast as radio signals by coastal navigation
authorities world-wide. The signals can travel long distances under
favourable circumstances, and so stations within hundreds of miles
of each other in each region of the world transmit at different times
of the day. Doing so prevents their transmissions interfering, and
producing unintelligible signals at the receiver.
Each transmitting station has an identifying letter (known as the
"station ident"), which is allocated by the authorities to ensure that
no nearby station in each region of the world shares the same letter.
A selection of Navarea 1 (United Kingdom) transmitter station idents
is shown in Table 1. World-wide station idents and transmission
times are listed in the Admiralty List of Radio Signals, Volume 3,
published by Her Majesty's Stationery Office (HMSO).
1
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