transceiver is powered through a 7.5-ampere circuit breaker placarded UHF , located on the mission control panel
3-8. VOICE SECURITY SYSTEM TSEC/KY-58 (COMPLETE PROVISIONS ONLY).
Complete provisions only are provided for a TSEC/KY-58 voice security system. This system provides secure
(ciphered) two-way voice communications for the pilot and copilot in conjunction with the #1 UHF, VHF-FM (SINC-
GARS), and #2 (BU VOW) transceivers. The system will be located in the left equipment rack behind the pilot.
System circuits are protected by the UHF , VHF-FM , and BU VOW circuit breakers on the overhead circuit breaker
3-9. BACK-UP VOICE ORDER WIRE (BU VOW) (AN/ARC-164).
A transceiver identical in type and performance to the UHF transceiver (Fig. 3-2) is located on the left equipment
rack, to serve as a back-up voice order wire. The transceiver can only be controlled by the ASE/ACS. Standby control
is not available. The transceiver is selected on the audio control panel (Fig. 3-1) by transmitter-intercom selector
switch position number 5 and by radio audio monitor control number 5. This set provides for secure communications
through interfacing with a voice security system. The back-up voice order wire set is protected by the 7 1/2-ampere
BU VOW circuit breaker in the overhead circuit breaker panel (Fig. 4-1). The back-up voice order wire shares an
3-10. VHF COMMUNICATIONS TRANSCEIVERS (VHF-22B).
The VHF communications transceivers provide airborne VHF communications on 1360 channels from 118.00
through 151.975 MHz. The solid-state transceiver includes capture-effect automatic squelch to help prevent
missed radio calls, plus audio leveling and response shaping to ensure audio quality. Transmitter side tone comes
from detected transmitter signal, and is therefore a reliable check of transmission quality. Each VHF transceiver
is powered through its respective circuit breaker, placarded VHF #1 or VHF #2 , located on the overhead circuit
breaker panel (Fig. 2-12). The AVIONICS MASTER POWER switch on the overhead control panel controls power.
The Radio Control Unit (RCU) (Fig. 3-3) provides frequency management to the crew.
3-11. ADVANCED COMMUNICATIONS SYSTEM (AN/ARC-210).
secure (anti-jamming/electronic protection) 2-way voice communications over the 30 to 400 MHz frequency range,
including 2-way voice and data communications in the UHF satellite communication (SATCOM) band. ARC-210 can
be controlled by either ARC-210 control unit or through CDU 7000 with ARC-210 control switch. The TRANSCEIVER
15A circuit breaker, on the Mission Control Panel provides power to the transceiver and the CONTROL PANEL
3A circuit breaker provides power to the control unit. Turn On, Test, Normal Operations, and Shutdown will be in
accordance with the vendor s operator manual.
b. ACS Transceiver Control-Display Unit Controls and Functions.
(1) VOL/SQ OFF (PULL). The VOL potentiometer adjusts audio output level. SQ OFF push-pull switch
disables main receiver squelch in the out position and enables main receiver squelch when pushed in.
(2) CHAN/FREQ/NET/TIME display. Liquid crystal module display.
Displays channel, frequency, net,
time, mode, or built-in test (BIT) results.
(3) CHAN/FREQ CRSR (PUSH) selector. Channel/Frequency cursor pushbutton rotary switch. Each time
the switch is pressed, the cursor position changes. Rotating the switch changes channel or frequency value
depending on mode selected and cursor position.
(4) LOAD/OFST pushbutton. When pressed, enables the loading of various data and/or operating fre-
quencies depending on the mode selected.