Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 249)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
NAVTEX ON/OFF Mode: Navtex Default:OFF
Parameters:
ON
Navtex receive mode is enabled.
OFF
Navtex receive mode is disabled.
NAVTEX is an immediate command. The NAVTEX command must be issued under the
"a_cmd:" Amtor command prompt. Under the "a_cmd:" command prompt, type NAVTEX
or the abbreviation to put your MFJ-1278B into NAVTEX receive mode. While in
NAVTEX receive mode the signals on 518 KHz are available to the MFJ-1278B to receive.
Tune your radio to 518 KHz.
To receive NAVTEX, MFJ-1278B must first receive the ZCZC start message, followed by
the four character preamble described above. If this is not received intact, the message will
not be received. At the end of the message, NNNN will be received and the MFJ-1278B will
stop receiving the Navtex message.
The MFJ-1278B will remember the last 200 four character preambles received with less than
1/8 of its characters received in error. The MFJ-1278B will not reprint any of these messages
when they are re-transmitted from that Navtex station. If you exit the "a-cmd:" command
prompt, the preamble memory is erased.
Emergency messages are numbered 00 and will always be printed regardless of whether they
have already been received.
NAVSTN Text
Mode: Navtex Default: ALL
To prevent your MFJ-1278B from receiving certain Navtex stations, just type "NAVSTN
XXXXXXXXXXXXX", where each X is the identifying letter of the station you want to
receive. Your list of stations to receive may contain up to 26 letters, each representing a
station.
For example, if you want to receive only stations A, C and P, then you type "NAVSTN
ACP". Only signals from these three stations will be received by your MFJ-1278B.
If you want to prevent certain stations from being received, leave then off the list. Then,
those stations will not be received while others within the receiving area will.
You may also type "NAVSTN ALL" (the Default value) to receive all Navtex stations.