3.8 VOICE SECURITY SYSTEM TSEC/KY-58.
The TSEC/KY-58 (RCU), located in the right console, in-
terfaces with the AN/ARC-186 and AN/ARC-201 radios to
provide secure voice (ciphony) for these radios. The
TSEC/KY-58 receives 28 vdc from the 28 vdc emergency
bus through the KY-28 circuit breaker on the pilot over-
head circuit breaker panel.
Two operating modes are available: PLAIN mode for in-
the-clear voice transmission or reception, and C/RAD 1
(cipher) mode for secure radio transmission or reception.
The RCU POWER switch must be set to ON
and the KY-28 circuit breaker must be IN be-
fore AN/ARC-186 or AN/ARC-201 radio
communication (plain or ciphered) is pos-
3.8.1 Controls and Functions.
Voice security system
controls that require adjustment by the pilot include those
on the Z-AHQ Power Interface Adapter, TSEC/KY-58 (lo-
cated in the aft avionics bay), and the Z-AHP KY-58 RCU
(located in the pilot right-hand console). Each of these de-
vices are shown in figure 3-6. The function of each control
and indicator is described in tables 3-5 through 3-7.
Z-AHQ Power Interface Adapter Control and Indicator Functions
Control or Indicator
BBV, DPV, BBN,
Set according to type of radio being secured. Set to BBV for pilots VHF FM radio.
Clears crypto alarm that occurs upon power up. Alarm can also be cleared by pressing any
push-to-talk switch in the pilot compartment.
Prevents adjacent channel interference when using radios with channel spacing of 25 kHz.
Must be set to IN for pilots AN/ARC-186(V) VHF-FM radio.
Sets the Z-AHQ to the local mode. Switch returns to REM (remote) position upon release,
but equipment remains in local mode until any PTT is keyed.