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frequency, manually select
or preset, to include offsets
of + 5 or +10 kHz. It has a second
function on initiating an
ERF Transmission if a Hopset
or Lockout.
Set is in the holding memory
and the Mode Switch is in the
FH-M position.
TIME Used to display or change the
time setting maintained within
each RT.
FILL Used to fill ECCM parameters
from an external fill device.
Entry of ECCM parameters is
initiated by the H-LD button on
the keyboard with the FUNCTION
switch in LD or LD-V.
Figure 3-2-6. VHF/FM Radio Set (AN/ARC-201)
3-2-18. Voice Security Equipment TSEC/KY-58.
The voice security equipment is user with the FM band
of the No. 1 VHF AM/FM radio to provide secure two-way
communication. The equipment is controlled by the remote
control unit (RCU) Z-AHP mounted on the right side
of the console. The POWER switch must be at ON, regardless
of the mode of operation, whenever the equipment
is installed. Power to operate the voice security
system is supplied by the No. 2 DC bus through the
COMM KY-28 circuit breaker on the No. 2 PDP.
TM 1-1520-240-10
3-2-14
3-2-19. Controls and Functions. (fig. 3-2-7)
CONTROLS/
INDICATOR
FUNCTION
ZEROIZE Switch
(under springloaded
cover)
Momentary contact toggle
switch used to clear (ZEROIZE)
any crypto-net variables
stored in the TSEC/KY-58.
Delay Switch Two position toggle switch;
DELAY position used when received
signal is to be retransmitted.
PLAIN/C/RAD1
Switch
Two position rotary switch
used to select TSEC/KY-58 operating
mode. A third position
(C/RAD 2) is covered and
locked out.
PLAIN Permits normal (unsecured)
communications on associated
FM radio set.
C/RAD1 Permits secured communications
on associated FM radio
set.
FILL Switch Six position, rotary switch,
used to select any of six storage
registers for storage of
crypto-net variable (CNV).
MODE Switch Three position rotary switch
used to select the operating/
loading mode of the TSEC/
KY-58.
OP Allows normal operation of
KY-58.
LD Allows normal loading of CNV.
RV Allows remote loading of CNV.
POWER ON Switch
Position
Two position toggle switch
used to apply power to TSEC/
KY-58.
3-2-20. Normal Operation.
a. Operating procedures for secure voice.
NOTE
To talk in secure voice, the KY-58 must be
loaded with any number of desired variables.
(1) Set the MODE switch to OP.
(2) Set the FILL switch to the storage register
which contains the required CNV.
Figure 3-2-7. Remote Control Unit TSEC/KY-58
(Z-AHP)
(3) Pull out and lift up the POWER switch to ON.
A beeping tone and background noise will be heard in the
headset. Before the set can be used, the tone must be
cleared by momentarily keying the No. 1 VHF AM/FM
radio with the PTT switch.
(4) Set the PLAIN C/RAD1 switch to C/RAD1.
(5) If the signal is to be retransmitted, pull out
and lift up the DELAY switch to (ON).
(6) Clear voice procedures: To operate in
clear voice (plain text) simply:
(a) Set the PLAIN-C/RAD switch to
PLAIN.
(b) Operate the equipment.
b. Zeroizing procedures.
NOTE
Instructions should originate from the net controller
or commander as to when to zeroize
the equipment.
(1) Lift the red ZEROIZE switch cover.
(2) Push the spring-loaded ZEROIZE switch
up. This will zeroize position 1-16.
(3) Close the red cover. The equipment is now
zeroized and secure voice communications are no longer
possible.
c. Automatic remoter keying procedures.
NOTE
Automatic remote keying (AK) causes an old
CNV to be replaced by a new CNV. Net controller
simply transmits the new CNV over the
air to your KY-58.
(1) The net controller will use a secure voice
channel, with directions to stand by for an AK transmission.
Calls should not be made during this stand-by action.
TM 1-1520-240-10
3-2-15
(2) Several beeps will be heard in the headset.
This means that the old CNV is being replaced by a new
CNV..
(3) Using this new CNV, the net controller will
ask for a radio check.
(4) After the radio check is completed, the net
controller instructions will be to resume normal communications.
No action should be taken until the net controller
requests a radio check.
d. Manual remote keying procedures. The net controller
will make contact on a secure voice channel with
instructions to stand by for a new CNV by a manual
　
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