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The Free Text/Preset Message pages (fig. 4-102) allow 1. IDM switch  Press as required to display
the observer to compose and transmit any message up IDM Index page.
to 36 characters (two lines) at any time. Also, these
pages allow messages to be composed and stored for 2. MSGS/FTXT key  Press.
subsequent recall and transmission at the appropriate
time. The top message page includes a MAYDAY for 3. MSG PRESETS key  Press.
rapid MAYDAY broadcasts, a CHECKFIRE message for
a rapid cease fire broadcast, an authentication 4. Select message to be transmitted by pressing
synchronization message to align the FDC codes to the key adjacent to appropriate message number.
4-206
TM 1-1520-248-10
5. DEST− key  Press and enter subscriber
identifier.
6. SEND key  Press.
7. To return to IDM Index page, IDM switch 
Press.
4 - 2 0 2 . C H E C K F I R E M E S S A G E
TRANSMISSION.
To broadcast a cease fire message to all subscribers,
proceed as follows:
1. IDM switch  Press as required to display
IDM Index page.
2. MSGS/FTXT key  Press.
3. CHECKFIRE key  Press.
4. Broadcast identifier is automatically inserted
to change: DEST− key  Press and enter
identifier using MFK.
5. SEND key  Press.
6. To return to IDM Index page, IDM switch 
Press.
4-203. MAYDAY MESSAGE TRANSMISSION.
To broadcast a MAYDAY message, proceed as follows:
1. IDM switch  Press as required to display
IDM Index page.
2. MSGS/FTXT key  Press.
3. MAYDAY key  Press.
4. To change broadcast identifier, DEST− key 
Press. Enter identifier using MFK.
5. To change present position in UTM grid,
POSITION key  Press. Enter UTM using
MFK.
6. SEND key  Press.
7. To return to IDM Index page, IDM switch 
Press.
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
RAPID
RAPID
IDM INDEX PAGE
AIR REQ
ARTY REQ
MOVEMENT
REPORTS
RCVD MSG
START
STATUS
MSGS/FTXT
MESSAGE TYPE SELECT PAGE
MESSAGE TYPE
FREE TEXT
MSG PRESETS
MAYDAY
AUTH
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
RAPID
XMT
SEND
FREE TEXT MESSAGE SUMMARY PAGE
FREE TEXT-DATA
>
CHECKFIRE CANCKF
> DEST-??
> ANY MESSAGE 36 CHA
RACTERS LONG-
406530-47-13
J2997
Figure 4-102. Free Text/Preset Message Pages
4-207
TM 1-1520-248-10
4-204. AUTHENTICATION SYNCHRONIZATION is received, it will be stored in the RCVD MSGS index
TRANSMISSION. and an IDM MESSAGE advisory will appear on the
MFD. Twelve messages can be stored for review and
To broadcast an Authentication Synchronization deletion when desired, except for situation/status
transmission, proceed as follows: reports which are automatically deleted upon review.
Messages received while the RCVD MSGS index is full
1. IDM switch  Press as required to display will not be accepted, and the received advisory will not
IDM Index page. be displayed. When a message is received an
acknowledge (ACK) is automatically transmitted back to
2. MSGS/FTXT key  Press. the message originator with no operator action
r e q u i r e d . Messages r e c e i v e d w h i c h a r e n o t
3. AUTH key  Press. recognizable, improperly addressed (net data
incorrect), or unprocessable will be ignored. The
4. DEST− key  Press. Enter identifier of originator will not have an ACK displayed, and an IDM
s u b s c r i b e r w i t h w h i c h a u t o m a t i c MESSAGE will not be displayed to the receiver. A
authentication is desired. message received which is acceptable, but from an
originator not defined in the subscriber list, will be
5. When desired, SEND key  Press. stored and an advisory displayed; however, an ACK will
not be transmitted back. A message received
NOTE addressed to the Team or Broadcast identifiers will be
stored and an advisory displayed but an ACK will not
If authentication tables between sender and be sent to the originator. The RCVD MSG index will
receiver are not synchronized, an NAK will show the message number, the identifier of the sender,
be returned. Sender should not retransmit. a three character identifier of message type, a six
Receiver should change table positions and character field indicating the message content, and the
　
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