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RLY CIPHER/PLAIN switch (relay switch). The controls on the KY-58 control panel assembly are the
MODE select knob, unlabeled fill select knob, VOLUME control knob, and the unlabeled power select
knob (see figure 23-18).
23.5.2.1 KY-58 Mode Select Knob. The mode select knob has positions of P, C, LD, and RV. Placing
the knob to P enables plain mode of operation. Placing the knob to C enables the cipher mode of
Figure 23-17. Guard Transmit on COMM Sublevel
A1-F18EA-NFM-000
VII-23-23 ORIGINAL
operation. With the knob set to LD the load mode of operation is enabled. This mode is used for
loading data into the KY-58 control panel assembly. Information pertaining to the RV knob position
(receiver variable) will be supplied later.
23.5.2.2 KY-58 Fill Select Knob. The fill select knob has positions of 1 thru 6, a Z 1-5 position, and
a Z ALL position. Setting the knob to one of the six positions selects the position to be loaded with
data. Placing the knob to Z 1-5 zeroizes data in positions 1 thru 5. Placing the knob to Z ALL zeroizes
all data in positions 1 thru 6.
23.5.2.3 KY-58 Volume Control Knob. The volume control knob adjusts the volume of the KY-58
control panel assembly audio. The volume control knob should be set to full volume position during
secure voice transmission and reception.
23.5.2.4 KY-58 Power Knob. This knob has positions of ON, OFF, and TD. Placing the knob to ON
turns on power to the KY-58 control panel assembly if cipher mode has been selected. Placing the knob
to OFF removes power to the system. With the knob in TD, power is turned on for the system if cipher
mode has been selected and a time delay is selected for data processing. The knob must be in the TD
position for ciphered relay operations.
23.5.3 KY-58 Operation. Other stations or aircraft involved in cipher or cipher relay communication
must be in either the baseband or diphase mode.
1. COMM 1 and COMM 2 radios - ON
COMM 1 and COMM 2 radios are turned on and volume adjusted with the VOL 1 and 2 COMM
control knobs on the UFCD.
2. COMM 1 and COMM 2 channels - AS DESIRED
a. COMM 1 and COMM 2 channel select knobs - ROTATE (to select desired channel).
Selected channel is displayed in COMM 1 and 2 touch option/display on the UFCD.
Figure 23-18. KY-58 Control Panel Assembly
A1-F18EA-NFM-000
VII-23-24 ORIGINAL
3. COMM 1 and COMM 2 channel frequency - SET
a. COMM 1 and COMM 2 touch option/display - TOUCH
Channel number and frequency displayed in scratchpad GRCV, SQCH, and CPHR options
appear on the option/display.
b. Channel frequency - AS DESIRED
Enter new frequency with keypad. Press the ENT key to enter the new frequency.
4. CPHR touch option/display - TOUCH
The CPHR touch option/display is border highlighted and a series of tones are heard for 3
seconds indicating cipher is enabled with baseband operation. Touching the CPHR touch
option/display again changes the display to CPDP with the border highlighted and enables cipher
diphase mode.
23.5.3.1 KY-58 Cipher Mode. Other stations or aircraft involved in cipher communication must have
the KY-58 fill select knob in the same position.
1. KY-58 power knob - ON
2. KY-58 MODE knob - C
3. KY-58 VOLUME knob - ADJUST TO MAX VOLUME
4. COMM switch on inboard throttle - ACTUATE
UP for COMM 1, DOWN for COMM 2. A short tone is heard in the headset.
23.5.3.2 KY-58 Relay Mode. Relay mode can operate in Plain, Cipher and ECCM mode. Other
stations or aircraft involved in cipher relay communication must have the KY-58 fill select knob in the
same position.
1. KY-58 power knob - TD
Other stations or aircraft involved in cipher relay communication must have the KY-58 power
knob in the TD position.
2. KY-58 mode knob - C
3. KY-58 volume knob - ADJUST TO MAX VOLUME
4. COMM 1 antenna select switch - AUTO
5. Relay switch select - CIPHER
6. COMM switch on inboard throttle - ACTUATE
UP for COMM 1, DOWN for COMM 2. A short tone is heard in the headset.
NOTE
When entering the cipher relay mode from any plain mode, the Comm
1/Comm 2 transmit switch must be keyed twice; once to initialize the
KY-58 and a second time to transmit.
A1-F18EA-NFM-000
VII-23-25 ORIGINAL
23.6 DCS - DIGITAL COMMUNICATION SYSTEM
DCS provides all of the standard voice communication capabilities of earlier ARC-210 radios, plus
a digital data mode that greatly reduces pilot workload during Close Air Support (CAS) missions. It
enables the pilot to receive 9 line briefs, communicates target and mission data digitally from the
Forward Air Controller (FAC), and provides the capability to feed this information to weapon targeting
and navigation systems. Currently, this mission is handled via verbal communication and manual data
　
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