TM 55-1520-228-10
3-14 Change 11
3-27. VOICE SECURITY EQUIPMENT
(TSEC/KY-58).
a. Description. The voice security equipment is
used with the FM Command Radio to provide secure
two way communication. The equipment is controlled by
the control-indicator (Z-AHP) mounted in the lower con-
sole. The POWER switch must be in the ON position,
regardless of the mode of operation, whenever the
equipment is installed.
b. Controls and Functions. Refer to Figure 3-8.
3-28. OPERATING PROCEDURES. Normal
operation will exist without the TSEC/KY-58 and the
control-indicator (Z-AHP) being installed in the helicop-
ter. Refer to the following procedures to operate the
equipment in any particular mode.
3-29. SECURE VOICE PROCEDURES.
NOTE
To talk in secure voice, the KY-58 must
be “Loaded” with any number of desired
variables.
a. Set to MODE switch to OP.
b. Set the FILL switch to the storage register which
contains the crypto-net variable (CNV) you desire.
c. Set the POWER switch to ON.
d. Set the PLAIN C/RAD switch to C/RAD.
e. If the signal is to be retransmitted, set the DELAY
switch to (ON).
f. At this time a crypto alarm, and background
noise, in the aircraft audio intercom system should be
heard. To clear this alarm, press and release PTT in the
aircraft audio/intercom system. Secure voice commu-
nication is now possible.
NOTE
When operating in either secure or clear
(plain) voice operations, the VOLUME
must be adjusted on the aircraft radio
and intercom equipment to a comfort-
able operating level.
3-30. CLEAR VOICE PROCEDURES.
a. Set the PLAIN-C/RAD switch to PLAIN.
b. Operate the equipment.
3-31. ZEROIZING PROCEDURES.
CAUTION
Instructions should originate from
the Net Controller or Commander as
to when to zeroize the equipment.
To zeroize the KY-58: (Power must be
on).
a. Lift the red ZEROIZE switch cover on the RCU.
b. Lift the spring-loaded ZEROIZE switch. This will
zeroize positions 1-6.
c. Close the red cover.
The equipment is now zeroized and secure voice com-
munications are no longer possible.
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