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  TM 55-6930-214-10
Table 3-1. Avionics Systems
Nomenclature
Class
Use
Intercommunication
Intercomnunication System
Intercommunication between
C-11746(V)/ARC
crewmembers and control of
Remote Transmit Select
navigation and communica-
Switch Indicator
tion radios.
ID-2403/ARC RTSS
Remote transmit select
switch.
Radio Set AN/ARC-186(V)
FM/AM Communication
Two-way FM voice communica-
VHF-FM/AM No. 1
tions: FM and continuous-
wave homing in the freq-
uency range 30 - 87.975 MHz
plus AM 118 - 152 MHz.
FM/AM Comnunication
Radio Set AN/ARC-186(V)
Same as No. 1 VHF-FM set
VHF-FM/AM No. 2
except no homing capability.
Radio Set AN/ARC-164(V)
Two-way voice comnunication
UHF Communication
UHF-AM
with Have Quick function of
in the frequency range 225
through 399.95 MHz.
Voice Security System
TSEC/KY28 C-8157/ARC
Secure communication for
pilot FM radio.
Automatic Direction
Direction Finder Set
Radio range and broadcast
reception; automatic
direction finding and
homing in the frequency
range of 100 to 3000 kHz.
Lightweight Doppler
Doppler Navigation Set
Provides present position
Navigation Set (LDNS)
AN/ASN-128
or destination navigation
information in latitude and
longitude (degrees and
minutes) or universal
transverse mercator (UTM)
coordinates.
Identification
Transmits a specially coded
Transponder Set
AN/APX100(V)
Friend or Foe
reply to a ground-based IFF
radar interrogator system.
Absolute Altimeter
Measures height above ter-
Radar Altimeter
AN/APN-209
rain or above ground level
(AGL).
LR-80 HARS
Heading and Attitude
Senses helicopter attitude
and motion to define roll,
Reference Set
pitch, heading, and flight-
path.
3-2
Change 2
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