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CONTROL ON CANTED
CONSOLE
HIGH FREQUENCY
RADIO SET
AN/ARC-220 LONG RANGE TWO-WAY COMMUNICATIONS
WITH ALE AND ECCM
CONTROL ON CONSOLE
VHF-FM RADIO AN/ARC-201 TWO-WAY VHF-FM COMMUNICATIONS
AND HOMING
CONTROL ON CONSOLE
TM 1-1520-240-10
3-2-1
SECTION II. COMMUNICATIONS
3-2-1. Interphone System (C-6533/ARC).
The interphone system is a multi-station intercommunication
and radio control system for control of voice
radio communication. It also monitors the output of navigation
radio receivers and warning tones from IFF and
radar warning sets. The basic components of the interphone
system are six control panels (fig. 3-2-1). There is
one panel each for the pilot, copilot, troop commander,
the gunners stations, and flight engineer. in addition,
there is an interphone station for the hoist operator and
two external interphone receptacles. Power for the system
is supplied by the DC essential bust through the
COMM INTPH LH and COMM INTPH RH circuit breakers
on the No. 1 and No. 2 PDP.
3-2-2. Controls and Function, Interphone Control
(C-6533/ARC). (fig. 3-2-2)
CONTROLS/
INDICATOR
FUNCTION
Function Selector
Switch Position
Five position rotary switch
used to select interphone operating
mode.
ICS Connects headset-microphone
to interphone system.
1 Connects headset-microphone
to No. 1 VHF FM or No. 1 VHF
AM/FM radio set.
2 Connects headset–microphone
to UHF radio set.
3 Connects headset-microphone
to No. 2 VHF AM/FM radio set.
4 Connects headset-microphone
to HF radio set.
5 Not used.
NOTE
Pilot/Copilot can transmit on all four transmitters.
Troop Commander can transmit on the
HF and VHF FM transmitters only. Gunners
and Flight Engineer cannot access any transmitters.
Receiver Switches
1-5, AUX, and NAV
Position
Seven two position toggle
switches used to select-headset
audio input as follows:
1 - No. 1 VHF FM or No. 1
VHF AM/FM radio
CONTROLS/
INDICATOR
FUNCTION
2 - UHF radio
3 - No. 2 VHF AM/FM radio
4 - HF radio
5 - Not used
AUX - VOR/Localizer
NAV - direction finder
OFF disables associated audio
input to headset.
ON radio enables associated
input to headset.
HOT MIKE
Switch Position
Two position toggle switch enables
hands-free operation
(PTT/foot switch operation not
required) of headset microphone
for interphone only.
OFF Hands-free operation disabled.
PTT/foot switch operation required
for operation.
HOT MIKE Hands-fee operation enabled.
NOTE
Switch settings are not necessary to receive
marker beacon, radar warning, and IFF audio
tones.
Press to talk (PTT)
Switches Position
Two or three position switches
used to enable the microphone
side of the interphone system
when operator is speaking.
These switches are described
in detail below.
Pilot/Copilot Trigger
PTT Switch (on pilot
and copilot cyclic
stick) Position
Three position PTT switch. Off
disables microphone (not
pressed) enables headset.
Interphone
(First detent)
Enables microphone transmission
to all interphone stations,
regardless of function switch
settings.
Radio transmit
(Second detent)
Enables microphone transmission
over radio set selected by
control panel function switch.
Pilot’s/Copilot’s
Foot Switches (on
cockpit floor next to
heel slide) Position
Two position PTT switch.
TM 1-1520-240-10
3-2-2
Figure 3-2-1. Interphone Stations
TM 1-1520-240-10
3-2-3
CONTROLS/
INDICATOR
FUNCTION
Off Released position disables microphone.
Talk Depressed position: enables
headset microphone.
Hoist Control PTT
Switch (on hoist
control grip) Position
Two position PTT Switch.
Off Released position; disables microphone.
Talk Depressed position; enables
headset microphone
HOT MIKE switch
on HOIST OPERATORS
PANEl
(Chapter 4)
Three position toggle switch
selects hoist operator’s interphone
operating mode.
OFF Requires operation of PTT
switch for interphone communications.
HOT MIKE Operation of PTT switch not
required for interphone communications.
MOM ON Operation of PTT switch required
for interphone communications.
(Spring loaded to
OFF position when released.)
Gunner’s Foot
Switch Position
Two position pressure sensitive
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