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boxed option with the CIPHER ON status indicator means the selected key is valid for use and DCS
COMSEC is operational.
A1-F18EA-NFM-000
VII-23-27 ORIGINAL
Figure 23-20. DCS KEY Display
A1-F18EA-NFM-000
VII-23-28 ORIGINAL
If the status check determines there is a problem with the COMSEC function, the selected/boxed
crypto key option is Xd and a DCSCS advisory appears. However, it is possible the DCS COMSEC
function may be operational with other loaded crypto key options. Each crypto key option would have
to be selected (in CPHR or CPDP mode) to determine if the DCS COMSEC function is inoperable.
An Xd crypto key option may still be selected. If it is selected and the COMSEC error is no longer
indicated, the X is removed. All Xd status indications are cleared upon MC power-up.
If there is a problem with the DCS/COMSEC function, the boxed crypto key variable is covered by
an X. This indicates that DCS COMSEC function is inoperable with the selected crypto key. This
doesn't rule out the possibility the DCS COMSEC function may be operational with the other loaded
crypto keys. Each of the other crypto keys would have to be selected while in cipher or cipher diphase
modes before it could be determined the DCS COMSEC function is completely inoperable.
When a crypto key is unavailable and the applicable COMM switch is activated, a continuous audio
tone is heard in the headset.
23.6.3 UFCD - DCS. For normal UFCD operations, refer to Part 1, Section 2, or Part 7, Section 23.
23.6.3.1 ZEROIZE Function. Zeroization of DCS and KY-58 COMSEC KEYS, as well as TRANSEC
KEYS including HQ WODs (HAVEQUICK word of day) and SINCGARS EP (electronic protection),
is accomplished using the UFCD. The selection of the ZERO option causes the display to change to
ZERO ALL ENABLE, and clears the COMSEC and TRANSEC KEYS in the radios and KY-58. Both
COMSEC and TRANSEC KEYS are also zeroized upon pilot ejection. The ZERO ALL ENABLE
option is border highlighted for two seconds, and then the option returns to displaying ZERO. While
the ZERO ALL ENABLE option is displayed, selecting any option other than ZERO ALL ENABLE
causes the option to return to ZERO.
NOTE
The ACI panel IFF emergency switch no longer zeroizes the radios.
The DCS has an internal battery which is used to maintain the COMSEC KEYS in radio memory
during aircraft power transients and when aircraft power is removed. It also provides the energy to
zeroize the radio when the pilot ejects or if the radio is removed from the aircraft.
23.6.4 Relay Mode Of Operation. During cipher relay mode of operation using a DCS and an
ARC-210, encrypted information received on one radio is routed through the ACI panel to the second
radio for transmission. The encrypted information received on the first radio is also routed through the
ACI panel to the KY-58 for deciphering. The decrypted audio is routed back to the ACI panel, then to
the aircrew's headset.
The DCS COMSEC functions are not utilized during the cipher relay mode. In this mode the DCS
is always commanded to the plain voice mode, and all crypto relay transmissions are encrypted/
decrypted by the KY-58.
Certain constraints apply if cipher relay is selected and ADF bearing is needed. Cipher relay mode
may not be selected if ADF is already selected on COMM 2 (DCS). If ADF is selected on COMM 2 after
cipher relay mode has been enabled, COMM 2 ADF and cipher relay mode must be disabled before
control of DCS plain/CPHR/CHDP modes can be returned to COMM 2. If COMM 2 is an ARC-210,
the above constraints do not apply.
A1-F18EA-NFM-000
VII-23-29 ORIGINAL
Cipher relay operation must be performed within the COMM 1 and COMM 2 relay band limitations
outlined in figure 23-21.
NOTE
With CPHR or CPDP enabled, selection of PLAIN on the RLY
selector switch (ACI panel) does not activate plain relay mode.
REMOTE RELAY AIRCRAFT REMOTE
STATION
1 OR 2
COMM 1 COMM 2 STATION
2 OR 1
A *A *A A
B *B *B B
C *C *C C
D *D *D D
E *E *E E
A A C C
C C A A
A A D D
D D A A
C C D D
D D C C
B B E E
E E B B
A - 30.000 MHz to 87.975 MHz
B - 118.000 MHz to 155.975 MHz
C - 156.000 MHz to 173.975 MHz
D - 225.000 MHz to 399.975 MHz
E - 225.000 MHz to 399.975 MHz
* - When the relay aircraft is operating both radios
within the same band, the two frequency selections
must be separated by a minimum of 10 MHz.
NOTE: Both remote stations and the relay aircraft must have the KY-58 power knob in the TD positions.
Figure 23-21. Relay Bandwidth Limitations
23.6.5 DCS - Avionics Subsystem.
23.6.5.1 Mission Computer System. Channels 2 and 4 link the mission computer to DCS.
　
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