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MODE switch Set to P (Plain) to operate pilots VHF-FM radio in the clear. Set to C (Cipher) to operate
pilot’s VHF-FM radio in the ciphered (secure speech) mode. Set to LD (load) when
installing (CNVs) in the TSEC/KY-58 (TM 11-5810-262-12&P). Set to RV (receive
variable) during manual remote keying (TM 11-5810-262-12&P).
FILL connector Used to load (CNVs) into the TSEC/KY-58 registers (TM 11-5810-262-12&P).
FILL switch Pull knob and set to Z1-5 to zeroize (delete) (CNVs) in TSEC/KY-58 registers 1-5. Set to
1, 2, 3, 4 or 5 to select desired CNV. Pull knob and set to Z-ALL to zeroize (delete) (CNVs)
in all TSEC/KY-58 registers. Zeroizing all registers renders TSEC/KY-58 unusable.
Power switch Set to OFF to turn off both the TSEC/KY-58 and the pilots VHF-FM radio. Set to ON to
operate the TSEC/KY-58 and pilots VHF-FM radio. The TD (time delay) position is not
used.
3-21
TM 1-1520-236-10
Figure 3-6. Voice Security System Equipment
3-22
3.8.2 Operating Procedures.
TM 1-1520-238-10
b. Cipher Mode.
a. Preliminary Operation.
NOTE
Before the pilot VHF-FM radio may be operated
in ciphered (secure voice) mode, it
must be loaded with one or more (CNVS).
Refer to TM 11-5810-262-12&P for complete
details on loading these variables.
1. KY-58 POWER switch - ON.
2. KY-58 MODE switch - C (cipher).
3. KY-58 VOLUME control -As desired.
4. KY-58 Fill switch - Any numbered storage
register position (1-6).
5. Power Interface Adapter 4- Position switch to
BBV
6. Power Interface Adapter FILTER selector -
IN.
7. RCU DELAY switch - Down (off) position.
8. RCU C/RAD l-PLAIN switch - C/RAD 1.
9. RCU MODE switch - OP.
10. RCU Fill switch - Set to the proper (CNV).
11. RCU POWER switch - On.
NOTE
At this time you should hear an intermittent
tone and background noise. The background
noise is normal. The tone is a crypto
alarm that must be cleared before the
radio can be used. If step 12 does not clear
the intermittent tone, double check steps
1 through 11. If necessary, refer to
TM 11-5810-262-12&P.
12. RADIO/ICS switch - RADIO press and release
(or the pilot push-to-talk floor switch).
This should clear the crypto alarm.
1. After steps 1 through 12 are complete, the radio
is ready to transmit and receive secure
speech in ciphered mode.
2. To transmit, press any push-to-talk switch.
You may begin speaking following the beep.
c. Plain Mode.
1. C/RAD 1/PLAIN - PLAIN.
2. To transmit, press any push-to-talk switch.
You may begin speaking immediately.
d. Automatic Remote Keying (AK).
NOTE
AK causes an old CNV in one of the registers
to be replaced by a new one, or an
empty register to be filled. Your net controller
simply transmits the new CNV to
your TSEC/KY-58.
1. Your net controller will contact you by using a
secure voice channel, and tell you to wait for
an AK transmission. You must not transmit
during this period.
2. You will hear one or two beeps in your headset
when the AK occurs.
e. Manual Remote Keying (MK).
NOTE
MK requires you to use the RCU to change
CNVs.
1. The net controller will contact you by using a
secure voice channel. He will tell you to stand
by for a new or replacement CNV and that you
will use an MK action.
2. Fill switch -6. Notify the net controller by radio
when you have done this and stand by.
3. The net controller will tell you to set the
MODE switch to RV. Notify the net controller
when you have done this and stand by.
4. When notified by the net controller, set the fill
switch to the storage position selected to receive
the CNV. Notify the net controller when
you have done this and stand by.
3-23
TM 1-1520-238-10
5.
6.
The net controller will ask you to listen for a
beep. Wait two seconds.
MODE switch - OP.
If the MK operation was successful, the net
controller will contact you via the new CNV. If
the MK operation was not successful, the net
controller will contact you by a clear voice
(plain) transmission, tell you to set your fill
switch to position 6, and stand by while the
MK operation is repeated.
3.9 VOICE SECURITY SYSTEM TSEC/KY-28.
Not installed.
3.10 RADIO SET AN/ARC-201 .
Radio set AN/ARC-201, consists of a panel mounted
RT-1476/ARC-201 (transceiver) (fig 3-7). The receivertransmitter
is an airborne, (VHF) (FM) transceiver
used as part of a series of (SINCGARS). The radio set
does not have a guard channel. It has an (ECCM) frequency
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