Installation manual

Page 34
After connecting the printer, set the 'Printer port' parameter to 'NMEA port' on the
Setup mode : Serial options page and ensure that the 'Bridge port' and
'Alarm port' parameters are set to either 'IBS' or 'None'. Set the ‘NMEA port speed’ to
4800.
The printer is powered by the mains adaptor supplied and must be configured for
correct operation. The standard default settings for the printer should be used, except
for the following:
SW-1 Set for serial interface (not parallel)
SW-2 Set for English (not Japanese)
SW-3 Set for XON/XOFF control (not H/W BUSY)
SW-3 Set for 4800bps (not 75bps)
Refer to the DPU-414 manual for details of how to set these parameters.
The compass safe distance for the printer is 1.0 m.
The printer should be secured to prevent it moving during operation. The use of
adhesive foam pads is recommended.
ANTENNA INSTALLATION
Selecting a suitable antenna
The NAV-7 receives transmissions on three frequencies. 518 kHz transmissions are
in International English; 490 kHz and 4209.5 kHz transmissions may be in a local
language.
To receive on all frequencies the NAV-7 must be used with a wide frequency
(400 kHz to 5 MHz) antenna that covers 518 kHz, 490 kHz and 4209.5 kHz.
If you have purchased the NAV-7 receiver without an antenna then a suitable active
NAVTEX antenna should be used. McMurdo recommends the 905-05 as described in
the following section.
If an alternative antenna type is used it must be a low impedance 50 ohm
antenna or an antenna with a 50 ohm matching network. A mis-matched or high
impedance whip or wire antenna should not be used as the operational range of
NAVTEX reception may be greatly reduced; it is also important that the antenna is
capable of reception over the frequency range specified above.
Wire or long whip antennas must be fitted with a 50 ohm matching transformer.
Important, disable the NAV-7 antenna power setting – refer to Setup – Receiver
mode for details. If in any doubt a qualified GMDSS installer should be consulted.