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locations, etc., for later review or transmission; and MMS Azimuth Indicator.
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messages are automatically addressed to the team and
allow the team leader to effectively control his TEAM.
The BC identifier is two digits that define the broadcast
net of which the subscriber (originator) is a part. A
broadcast is defined as a group of teams with the same
net data and the same broadcast number/letter. If a
unit had two teams working the same area, or for
command and control from the company commander,
all aircraft should have the same broadcast number/
letter. If a unit had two teams working the same area,
or for command and control from the company
commander, all aircraft should have the same
broadcast identifier so that all aircraft can receive
instructions/notifications at the same time. All
subscribers who enter the same identifier in the team
and/or broadcast address w i l l receive general
transmissions sent to the identifier. The team and
broadcast identifier must also be placed on a defined
net prior to entry on Start page 1/3.
b. Start Page 2/3. This page defines all the
parameters for the NETS and subscribers (SUBS). It is
406075-1574-23 also the page where the automatic authentication
J2997
tables (AUTH) can be accessed, enabled, and filled
Figure 4-92. Sample TACFIRE page from the current SOI. The six preset messages (MSGS)
and movements (MVMT) can only be programmed
through the use of this page. Bulk data (BULK) transfer
4-173. START PAGES DESCRIPTION. is also controlled/accessed through this page. This
page is the major programming page for the IDM. All of
The Start pages are used to configure TACFIRE for the premission planning data is entered on this page.
l a t e r u s e . The pages m a i n t a i n t h e f i l e s f o r
communication, location, GO/NO GO test, time, and (1) NETS. A successful transmission requires
authentication. Communication subscriber identifiers that the sender and receiver be defined by the same
are entered as ORIGIN (ORIG), TEAM (TM), and net data. The net data parameters are a selection of
BROADCAST (BC). Additionally, a ZEROIZE key is TACFIRE or AIR NET, single block, double block, a
provided in the Start pages. This ZEROIZE key clears selection of baud rate, the radio, the preamble duration,
all data and table entries from IDM. Also included in the monitor duration, and what authentication mode will
these pages are the six message presets, the six be used.
movement presets, and the bulk data load.
(a) Net Selection. Eight nets are available
to be selected as either an AIR NET or TACFIRE NET
4-174. START PAGES OPERATION. (air elements can “talk” on a TACFIRE NET but
TACFIRE will not get all required data if defined in an
a. Start Page 1/3. There are several fields AIR NET). All aircraft working together in the same
requiring entries on this page: ORIG, TEAM, AND BC. team/broadcast should select AIR NET. If there is a
The originator (ORIG) is the aircraft/observer/crew requirement for an aircraft to “talk” to artillery, the
subscriber identifier and is in the SOI. It is a two-digit artillery should be defined in a separate TACFIRE NET.
identifier (from 00 to 31). The TEAM identifier consists
of two digits that define the team of which the originator (b) Block (BLK) Selection. Select
is a part. A team is a group of subscribers having the between single (SGL) block or double (DBL) block type
same NET data and the same team number/letter. A of transmission. Single block sends each segment of
team can be as few aircraft as two, the team leader data once per SEND. Double block sends each data
and another digital communication type aircraft, or a segment twice per SEND and can be used when
team could be platoon or company size. Several atmospheric conditions or reception are poor.
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15 common subscribers (a section or platoon for
(c) BAUD Rate Selection. Select between example). Team and broadcast identifiers must be
transmission rates of data bits (BAUD rate). Range: 75 included in a subscriber net for the IDM to recognize
bits per second (bps) very slow; 150 bps; 300 bps; them, i.e., team and broadcast cannot be entered on
600 bps; 1200 bps. If a TACFIRE net is selected, the Start page 1/3 until defined in the subscriber nets. The
only options are 1200 bps and 600 bps. The slower originator is automatically in all of the defined
rates for the AIR nets are to be used only if reception is subscriber nets. A TACFIRE subscriber must be in a
poor at high rates. The slower the baud rate the longer TACFIRE net. As the message originator, a subscriber
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(17)
