6 Commands
73
time the message will be counted as valid. If a message is received containing the same
four figure message identifier as a previously stored message, then the message is classed
as a repetition when it is received within the latency period. If received outside the
latency period, then the NAVTEX processor interprets the new message as a different
one, and stores it without checking for errors as an independent message. The setting
cmd: NAV DAYS 0 <Return>
turns off the NAVTEX processors automatic update, all messages are written
consecutively in the NAVTEX directory, even when message identifier duplication is
present. The default setting
cmd: NAV DAYS 3 <Return>
is a practical value for continuous operation, and needs not normally be changed. The
command
cmd: NAV DAYS <Return>
without argument displays the present āNAV DAYSā parameter.
6.65.5 AMTEX
The use and configuration of the AMTEX processor takes place using the NAVtex
command. There now exists an additional parameter "AMTEx". By using this parameter,
one can switch between normal NAVTEX operation (AMTEx 0) and AMTEX
configuration (AMTEx 1). The default AMTEx parameter is 0. The PTC-IIIusb is thus
preconfigured for normal NAVTEX operation.
One switches to the AMTEX configuration with the command:
cmd: NAVtex AMTEx 0 <Return>
As usual, it is only necessary to type the letters given in capitals, as well as the argument.
When the AMTEX configuration is switched on, the PTC-IIIusb uses an entirely separate
set of area codes and message types to those used by NAVTEX. The appropriate
NAVTEX parameters are NOT changed in any way by activating the AMTEX
configuration, and are stored separately. They remain untouched until the AMTEX mode
is turned off, at which point they become available as usual for NAVTEX reception.
When the AMTEX configuration is active, the AMTEX message types and area codes
can be changed as usual (e.g. "NAV XYZ" or "NAV AREA XYZ"). In AMTEX mode,
the valid message types are from A to Z (NAVTEX allows only A - L). The
AMTEX/NAVTEX processor uses the directory "AMTEX" instead of "NAVTEX" when
in AMTEX configuration.
The following default values are valid for AMTEX:
Selected AMTEX station identifier(s): AS
Selected AMTEX MESSAGE TYPES:
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E: DX News Bulletin
G: General News Bulletin
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