User's Guide

19
Selecting a Suitable Antenna
The ICS NAV5plus receives transmissions on two frequencies. 518 kHz
transmissions are in International English; 490 kHz tranmissions may be in
a local language.
To receive on both frequencies the ICS NAV5plus must be used with a
broadband antenna that covers both 518 kHz and 490 kHz.
Only one antenna can be connected to the ICS NAV5plus, either to the
passive antenna input or to the active antenna input.
Several different antenna types are recommended for the ICS NAV5plus.
The best option will depend upon the receive frequencies required and the
ease of installation.
Choice of Antenna
Antenna 490 kHz 518 kHz
ANT/w
99
NAV-ANT/w *
99
NAV-ACTIVE *
99
Whip antenna with 50 ohm match
99
Long wire with 50 ohm match
99
* recommended options
The ICS NAV5plus must be used with a low impedance 50 Ω antenna
or an antenna with a 50 Ω matching network.
A ‘mis-matched’ or ‘high impedance’ whip or wire antenna should not be
used or the operational range of NAVTEX reception will be greatly reduced.
• If a ‘Wire’ or ‘long whip’ antenna is used with the ICS NAV5plus it must
be fitted with a 50 Ω matching transformer.