USArmy-ApacheLongbow

TM 1-1520-251-10
Table 3-1.
Communication/Navigation Equipment - continued
Equipment
Nomenclature
Use
Range
Control
Location
Remarks
Voice Security
System
TSEC/KY-58
(CIPHER
DEVICE)
Secures
communication for
UHF radio.
Not
applicable
MPD, UFD,
and
EMERGENCY
panel.
The COMSEC subsystem
provides control of the
TSEC/KY-58 from both
crew stations. It has the
capability to store up to 6
Crypto Net Variables.
FM amplifier
Improved FM
(IFM)
Varies power
output of FM1.
Not
applicable
MPD
Is a variable power
amplifier capable of
providing RF output at
four power levels.
Transponder set RT-1836/
APX-118(V)
Transmits a reply
coded to a radar
interrogator
system.
Line of
sight
MPD, EUFD,
and
EMERGENCY
panel.
Includes mode S growth
provisions and embedded
encrypted Mode 4
operation.
Transponder set RT-1471/
APX-100(V)
Transmits a reply
coded to a radar
interrogator
system.
Line of
sight
MPD, EUFD,
and
EMERGENCY
panel.
Optional installation to
RT1836/APX-118
Identification
Friend or Foe
(IFF)
Kit-1C computer
Provides encrypted
mode 4 operation.
Not
applicable
Not applicable
Not reguired for
RT1836/APX-118
Communication
Interface Unit
CIU
P/N
7-513200010
Provides
centralized
processing and
distribution of
communication
data and audio
signals.
Not
applicable
Not applicable
Provides audio switching,
conditioning, and mixing
capabilities; crew monitor
and transmitter
selections; and voice
messages and warning
tones.
Improved Data
Modem
IDM, MD-1295/A
Provides an
interface between
tactical aircraft
radios and data
bus.
Not
applicable
MPD
Provides capability to
transmit and receive data
via Longbow Protocol.
Use or disclosure of this information is subject to the restriction(s) on the title page of this document.
Change 3 3-3