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the transmission. The baud rate for the TACFIRE nets from any defined net may be selected and IDM will
defaults to 1200 bps automatically. automatically set to that net data. However, a
subscriber using another set of net data would not be
(d) RADIO Selection. Select between the
able to establish contact without resetting net data to
type of radio desired. The radio numbers (1 thru 4)
match the originator. Should SUB appear, it signifies
correspond to the same numbers as the intercom
that the subscriber selected as the destination is not
positions: 1 = FM-1, 2 = UHF, 3 = VHF, 4 = FM-2. HF
defined in the subscriber list.
cannot be used with the IDM. IDM will automatically
select the radio for the transmission to a subscriber by
how that subscriber is defined. IDM will not select NOTE
frequency. Prior to an IDM transmission the sender
should verify that the radio is tuned to the proper Because the IDM expands the number of
frequency. TACFIRE nets are normally set on radio 1. subscribers per net to 15 (ATHS supports
Air nets can be any of the radio selections. only 9) two-digit subscriber IDs must be
entered (i.e., - 00 - 0Z, 10 - 1Z, etc.). To
(e) Preamble (PRE) Select. An interval communicate with ATHS or TACFIRE
between 0.1 second and 9.9 seconds may be selected. subscribers, the originator and destination
A minimum preamble of 0.4 second is required when subscriber IDs must be in the range 00-0Z.
transmitting through crypto equipment. The preamble is In other words, i f an ATHS-equipped
used as on-air time for a link to be established between platform has selected a subscriber ID of
the sending and receiving units prior to the message “A”, a subscriber “0A” should be entered in
being sent. The longer the preamble, the longer the on- the appropriate net. In addition, an
air time. originator ID on the IDM-equipped aircraft
(f) Monitor (MON) Select. A time from 0.5 must be within the range 00-09, 0A-0Z. (In
second to 9.9 seconds or OFF may be selected. The the example given “0A” should be the
monitor time is the selected time that IDM listens for originator chosen for the IDM-equipped
interfering traffic prior to transmitting. If more than 15 aircraft since the ATHS-equipped platform
seconds have elapsed after the SEND key has been has this subscriber ID.)
pressed, the IDM will reset automatically and SEND (3) Authentication. Automatic authentication
must be pressed again. Voice transmission has priority tables are accessed from this page. There are two
over a digital transmission; therefore, the IDM will wait tables, one transmit and one receive, that hold 100
until the airway is clear of voice traffic if a monitor time authentications each. In the event the number of
has been selected. authentications remaining reaches 20 or less, the
(g) Authentication (AUTH) Select. Select advisory message AUTH LOW will display on the MFD.
between MANUAL authentication or NONE. If MANUAL This must be loaded prior to each mission if they have
is selected, an operator input of the transmission been depleted or the SOI has changed. As an
authenticator is required each time transmission is authentication is used, it is automatically deleted and
attempted. If NONE is selected, no authentication is the computer steps to the next code. The table can
required. This function automatically displays NONE only be used on nets that have been selected as NONE
due to use of automatic authentication. Manual on the authentication select on the net parameter page.
authentication is normally only used in air-to-air or air- If, when using automatic authentication, usually only
to-ground communication but not air-to-TACFIRE. If with TACFIRE, the transmit or receive line sequence
MANUAL is selected, but no manual authentication is becomes incorrect, transmission of an authentication
desired at the time of transmission, the message will be synchronization message is required (see MSG/FREE
sent on the second press of the SEND button. TEXT). By transmitting this message, the TACFIRE
operator can see the anticipated next table line and
(2) Subscribers (SUBS). Subscriber net adjust the computer. A not acknowledged (NAK) will
assignments are required. Each net can be made up of appear; however, momentarily normal digital
4-191
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
IDM INDEX PAGE
AIR REQ
ARTY REQ
MOVEMENT
REPORTS
RAPID
RCVD MSG
START
STATUS
MSGS/FTXT
VSD HSD MMS COMM
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
PULL
MAN
PULL
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(18)
