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The BC identifier is a single digit that defines the 600 bps; 1200 bps. If a TACFIRE net is selected, the
broadcast net of which the subscriber (originator) is a only options are 1200 bps and 600 bps. The slower
part. A broadcast is defined as a group of teams with rates for the AIR nets are to be used only if reception is
the same net data and the same broadcast number/ poor at high rates. The slower the baud rate the longer
letter. If a unit had two teams working the same area, the transmission. The baud rate for the TACFIRE nets
or for command and control from the company defaults to 1200 bps automatically.
commander, all aircraft should have the same (d) RADIO Selection. Select between the
broadcast number/letter. If a unit had two teams type of radio desired. The radio numbers (1 thru 4)
working the same area, or for command and control correspond to the same numbers as the intercom
from the company commander, all aircraft should have positions: 1 = FM-1, 2 = UHF, 3 = VHF, 4 = FM-2.
the same broadcast identifier so that all aircraft can ATHS will automatically select the radio for the
receive instructions/notifications at the same time. All transmission to a subscriber by how that subscriber is
subscribers who enter the same identifier in the team defined. ATHS will not select frequency. Prior to an
and/or broadcast address w i l l receive general ATHS transmission the sender should verify that the
transmissions sent to the identifier. The team and radio is tuned to the proper frequency. TACFIRE nets
broadcast identifier must also be placed on a defined are normally set on radio 1. Air nets can be any of the
net prior to entry on Start page 1/2. radio selections.
b. Start Page 2/2. 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 4.0 seconds may be selected.
also the page where the automatic authentication A minimum preamble of 0.4 second 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 ATHS. All
of the permission planning data is entered on this page. (f) Monitor (MON) Select. A time from 0.5
second to 9.9 seconds or OFF may be selected. The
(1) NETS. A successful transmission requires monitor time is the selected time that ATHS listens for
that the sender and receiver be defined by the same interfering traffic prior to transmitting. If more than 15
net data. The net data parameters are a selection of seconds have elapsed after the SEND key has been
TACFIRE or AIR NET, single block, double block, a pressed, the ATHS will reset automatically and SEND
selection of baud rate, the radio, the preamble duration, must be pressed again. Voice transmission has priority
the monitor duration, and what authentication mode will over a digital transmission; therefore, the ATHS will
be used. wait until the airway is clear of voice traffic if a monitor
time has been selected.
(a) Net Selection. Eight nets are available
to be selected as either an AIR NET or TACFIRE NET (g) Authentication (AUTH) Select. Select
(air elements can “talk” on a TACFIRE NET but between MANUAL authentication or NONE. If MANUAL
TACFIRE will not get all required data if defined in an is selected, an operator input of the transmission
AIR NET). All aircraft working together in the same authenticator is required each time transmission is
team/broadcast should select AIR NET. If there is a attempted. If NONE is selected, no authentication is
requirement for an aircraft to “talk” to artillery, the required. This function automatically displays NONE
artillery should be defined in a separate TACFIRE NET. due to use of automatic authentication. Manual
authentication is normally only used in air-to-air or air-
(b) Block (BLK) Selection. Select to-ground communication but not air-to-TACFIRE. If
between single (SGL) block or double (DBL) block type MANUAL is selected, but no manual authentication is
of transmission. Single block sends each segment of desired at the time of transmission, the message will be
data once per SEND. Double block sends each data sent on the second press of the SEND button.
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TM 1-1520-248-10
(2) Subscribers (SUBS). Subscriber net receive automatic authentication table, and transmit
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(129)
