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TM 11-5821-333-12
1-20. DATA OPERATION WITH DATA RATE ADAPTER. Continued
d. Plain-Text Data. Incoming FSK tones are routed from the intercom to the DRA (through the Z-AHQ, if
used). The DRA recognizes the signal as FSK. The DRA adds a preamble code word that identifies the signal as
data. The FSK tone is converted to 16 kb/s data, conditioned, and routed to the RT for transmitting. A received
signal is routed from the RT to the DRA (through the Z-AHQ, if used). The signal is processed, converted to FSK
tones, and routed to the intercom (through the Z-AHQ, if used) for processing by the digital equipment.
e. Cipher-Text Data. Incoming FSK tones are routed from the intercom to the DRA (through the Z-AHQ, if
used). The DRA recognizes the signal as FSK. It generates a preamble code word that identifies the signal as
data. The FSK tones are converted to 16 kb/s data, conditioned, and routed to the KY-58 for encryption. The
encrypted data is returned to the DRA and routed to the RT for transmitting (through the Z-AHQ, if used). A
received signal is routed from the RT to the DRA (through the Z-AHQ, if used). The DRA initially places the KY-58
in data mode and checks for the code word preamble that identifies the signal as data. This code word should be
present. The KY-58 remains in data mode. The decrypted signal is processed by the DRA and converted to FSK
tones. The FSK tones are routed to the intercom (through the Z-AHQ, if used) for processing by the
equipment.
1-21. REMOTE CONTROL OPERATION.
digital
ARRANGEMENT
An RCU is required with the remote RT. An RCU
remote RT.
The RCU communicates with the RT over a serial data interface. Control and data words are transferred from RCU
to RT, Display words are transferred from RT to RCU. The RT receive audio is routed through the RCU volume
control on the way to the intercom headset.
A take control switch is used when a radio set has dual controls. Only one control point at a time is functional. The
other is disabled by the ground from the take control switch. The take control ground also causes the volume
control to be bypassed on the disabled control. The display on the disabled control will still function.
FOR REMOTE CONTROL OPERATION
is optional with the panel RT. A second RCU is optional with the
1-18
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