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.
CONTROL/INDICATOR FUNCTION
1 ZEROIZE switch ... Zeroizes the KY-58; clears any encoding in the system (two-position
momentary toggle under spring loaded cover).
2 DELAY switch... Used when signal is to be retransmitted. two-position toggle
3 PLAIN-C/RAD In the PLAIN position, permits normal (unciphered) Switch rotary communications on the associated FM radio set.
two-position In the C/RAD position, permits ciphered selector switch communications on the associated r adio set. 4 C/RAD2 ... Location of stop for C/RAD2 on front panel.
Switch stop
5 FILL switch ... Permits pilot to select one of 6 storage registers for
six-position filling.
rotary switch
6 MODE Switch ... In the OP position KY-58 normal operating. three position In the LD position for filling.
rotary
In the RV position KY-58 in Receive-Variable Filled from another external source.
7 POWER ON switch ... Connects power to the associated TSEC/KY-58
two position cipher equipment in the ON (forward) position,
toggle and disconnects power from the equipment in the OFF (aft) position Turns on power to TSEC/KY-58.
206075-262
Figure 3-8. Voice Security Equipment T/SEC KY-58
NOTE
Automatic Remote Keying (AK) causes an "old" crypto-net variable (CNV) to be replaced by a "new" CNV. Net Controller simply transmits the "new" CNV to your KY-58.
a. 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.
b. Several beeps should now be heard in your headset. This means that the "old" CNV is being replaced by a "new" CNV.
c. Using this "new" CNV, the Net Controller will ask you for a "radio check."
d. 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."
3-33. MANUAL REMOTE KEYING PROCEDURES.
The Net Controller will make contact on a secure voice channel with instructions to stand by for a new crypto-net variable (CNV) by a Manual Remote Keying (MK) action. Upon instructions from the Net Controller:
a. Set the Z-AHP FILL switch to position 6. Notify the Net Controller by radio, and stand by.
b. When notified by the Net Controller, set the Z- AHP MODE switch to RV (receive variable). Notify the Net Controller, and stand by.
c. When notified by the Net Controller, set the Z- AHP FILL switch to any storage position selected to receive the new CNV (may be unused or may contain the variable being replaced). Notify the Net Controller, and stand by.
NOTE
When performing Step c. the storage position (1 through 6) selected to receive the new CNV may be unused, or it may contain the variable which is being replaced.
(1) Listen for a beep on your headset. (2) Wait two seconds.
(3) Set the RCU MODE switch to OP. (4) Confirm.
e. If the MK operation was successful, the Net Controller will now contact you via the new CNV.
f. If the MK operation was not successful, the Net Controller will contact you via clear voice (plain) transmission; with instructions to set your Z-AHP FILL selector switch to position 6, and stand by while the MK operation is repeated.
3-34. KY-58 AUDIO TONES. It is important to be
familiar with certain KY-58 audio tones. Some tones indicate normal operation, while others indicate equipment malfunction. These tones are:
a. Continuous beeping, with background noise, is cryptoalarm. This occurs when power is first applied to the KY-58, or when the KY-58 is zeroized. This beeping is part of normal KY-58 operation. To clear this tone, press and release the PTT button on the Z- AHQ (after the Z-AHQ LOCAL switch has been pressed). Also the PTT can be pressed in the cockpit.
b. Background noise indicates that the KY-58 is working properly. This noise should occur at TURN ON of the KY-58, and also when the KY-58 is generating a cryptovariable. If the background noise is not heard at TURN ON, the equipment must be checked out by maintenance personnel.
c. Continuous tone, could indicate a "parity alarm." This will occur whenever an empty storage register is selected while holding the PTT button in. This tone can mean any of three conditions:
(1) Selection of an empty storage register. (2) A "bad" cryptovariable is present.
(3) Equipment failure has occurred. To clear this tone, follow the "Loading Procedures" in TM 11- 5810-262-OP. If this tone continues, have the equipment checked out by maintenance personnel.
Change 11 3-17 d. Continuous tone could also indicate a cryptoa-
larm. If this tone occurs at any time other than as indi- cated in paragraph 3-34.c. above, equipment failure may have occurred. to clear this tone, repeat the “Load- ing Procedures” in TM 11-5810-262-OP. If this tone con- tinues, have the equipment checked out by maintenance personnel.
e. Single beep, when RCU is not in TD (Time Delay), can indicate any of three normal conditions:
(1) Each time the PTT button is pressed when the KY-58 is in C (cipher) and a filled storage register is selected, this tone will be heard. Normal use (speaking) of the KY-58 is possible.
(2) When the KY-58 has successfully received a cryptovariable, this tone indicates that a “good” crypto- variable is present in the selected register.
(3) When you begin to receive a ciphered mes- sage, this tone indicates that the cryptovariable has passed the “parity” check, and that it is a good variable.
f. A single beep, when the RCU is in TD (Time Delay) occurring after the “preamble” is sent, indicates that you may begin speaking.
g. A single beep, followed by a burst of noise after which exists a seemingly “dead” condition indicates that your receiver is on a different variable than the distant transmitter. If this tone occurs when in cipher text mode: Turn RCU FILL switch to the CNV and contact the trans- mitter in PLAIN text and agree to meet on a particular variable.