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can also be passed to, and received from, handheld ORIGIN (ORIG), TEAM (TM), and BROADCAST (BC).
data message devices (DMD’s). This system provides Additionally, a ZEROIZE key is provided in the Start
the ability to format complex messages such as artillery pages. This ZEROIZE key clears all data and table
f i r e requests, reports, emergency broadcasts, entries from IDM. Also included in these pages are the
automatic reporting of status, movement commands, six message presets, the six movement presets, and
and general free text messages with automatic or the bulk data load.
manual authentication.
4-132. START PAGES OPERATION.
4-129. OPERATIONAL DESCRIPTION.
a. Start Page 1/3. There are several fields
To select the IDM mode of operation, the CPG presses requiring entries on this page: ORIG, TEAM, AND BC.
the IDM switch on the CPG auxiliary panel (fig. 4-77). The originator (ORIG) is the aircraft/observer/crew
This causes the MFD to display any waiting messages, subscriber identifier and is in the SOI. It is a two-digit
4-151
TM 1-1520-248-10
identifier (from 00 to 3I). The TEAM identifier consists of transmission. Single block sends each segment of
of two digits that define the team of which the originator data once per SEND. Double block sends each data
is a part. A team is a group of subscribers having the segment twice per SEND and can be used when
same NET data and the same team number/letter. A atmospheric conditions or reception are poor.
team can be as few aircraft as two, the team leader
and an other digital communication type aircraft, or a (c) BAUD Rate Selection. Select between
team could be platoon or company size. Several transmission rates of data bits (BAUD rate). Range: 75
messages are automatically addressed to the team and bits per second (bps) very slow; 150 bps; 300 bps;
allows the team leader to effectively control his TEAM. 600 bps; 1200 bps. If a TACFIRE net is selected, the
The BC identifier is two digits that define the broadcast only options are 1200 bps and 600 bps. The slower
net of which the subscriber (originator) is a part. A rates for the AIR nets are to be used only if reception is
broadcast is defined as a group of teams with the same poor at high rates. The slower the baud rate the longer
net data and the same broadcast number/letter. If a the transmission. The baud rate for the TACFIRE nets
unit had two teams working the same area or, for defaults to 1200 bps automatically.
command and control from the company commander,
all aircraft should have the same broadcast number/ (d) RADIO Selection. Select between the
letter. If a unit had two teams working the same area type of radio desired. The radio numbers (1 thru 4)
or, for command and control from the company correspond to the same numbers as the intercom
commander, all aircraft should have the same positions: 1 = FM-1, 2 = UHF, 3 = VHF, 4 = FM-2. HF
broadcast identifier so that all aircraft can receive cannot be used with the IDM. IDM will automatically
instructions/notifications at the same time. All select the radio for the transmission to a subscriber by
subscribers who enter the same identifier in the team how that subscriber is defined. IDM will not select
and/or broadcast address w i l l receive general frequency. Prior to an IDM transmission the sender
transmissions sent to the identifier. The team and should verify that the radio is tuned to the proper
broadcast identifier must also be placed on a defined frequency. TACFIRE nets are normally set on radio 1.
net prior to entry on Start page 1/3. Air nets can be any of the radio selections.
b. Start Page 2/3. This page defines all the (e) Preamble (PRE) Select. An interval
parameters for the NETS and subscribers (SUBS). It is between 0.1 second and 9.9 seconds may be selected.
also the page where the automatic authentication A minimum preamble of 0.4 seconds is required when
tables (AUTH) can be accessed, enabled, and filled transmitting through crypto equipment. The preamble is
from the current SOI. The six preset messages (MSGS) used as on-air time for a link to be established between
and movements (MVMT) can only be programmed the sending and receiving units prior to the message
through the use of this page. Bulk data (BULK) transfer being sent. The longer the preamble, the longer the onis
also controlled/accessed through this page. This air time.
page is the major programming page for the IDM. All of (f) Monitor (MON) Select. A time from 0.5
the permission planning data is entered on this page. seconds to 9.9 seconds or OFF may be selected. The
(1) NETS. A successful transmission requires monitor time is the selected time that IDM listens for
that the sender and receiver be defined by the same interfering traffic prior to transmitting. If more than 15
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(2)
