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entry. A new communication control panel, incorporated with the Multifunctional Information
Distribution System (MIDS), is needed to interface with the DCS.
In the frequency range of 118.000 through 136.975 MHz, the DCS can be tuned to 8.3 KHz channels
to facilitate air traffic control communications in European air space. Tuning the radio to these
frequencies is performed via the UFCD as in any other band. In this band, however, the entered
frequency is not the actual tuned RF frequency. Refer to figure 23-19 for the convention adopted by
the International Civil Aviation Organization (ICAO).
Actual RF Frequency (MHz) UFCD Frequency (MHz) Channel BW (KHz)
118.0000 118.000 25
118.0000 118.005 8.3
118.0083 118.010 8.3
118.0166 118.015 8.3
118.0250 118.020 25
118.0250 118.025 25
118.2500 118.030 8.3
118.0333 118.035 8.3
118.0416 118.040 8.3
118.0450 118.045 25
118.0500 118.050 25
118.0500 thru 136.9750 118.55 thru 136.975 8.3 or 25
Figure 23-19. DCS Frequencies Conversions
23.6.1 VHF/UHF Communication System - DCS. The aircraft voice communications system consists
of an ARC-210 radio (COMM 1), a ARC-210/DCS radio (COMM 2), and KY-58 Secure Speech
Equipment. DCS provides its own integrated secure speech encoder/decoder which allows COMM 1
and COMM 2 radios to simultaneously operate in cipher mode.
NOTE
The aircraft COMM 2 radio can also be installed with an ARC-210. In
this configuration, the KY-58 is shared between COMM 1 and COMM
2 as in earlier aircraft.
When operating the COMM 2 radio (either ARC-210 or DCS) in a band that allows selecting AM or
FM, make sure the modulation is selected before the frequency is entered. Failure to do this may not
allow the selected modulation to be accepted into memory.
A1-F18EA-NFM-000
VII-23-26 ORIGINAL
23.6.1.1 ARC-210/DCS. DCS has additional capabilities which do not exist in the ARC-210. One
such capability is two-way digital data communications using Variable Message Format (VMF) for the
CAS mission. Another is storage of the cryptographic keys COMSEC communications. Finally, 8.3
KHz channel spacing is provided in the 118.00 through 136.975 MHz for Air Traffic Control (ATC)
communications required in European airspace.
23.6.1.1.1 COMM 1 and COMM 2 Volume Controls. The volume of the COMM 1 and COMM 2
radios is controlled by volume controls on the UFC.
23.6.2 DCS COMSEC (Communications Security).
23.6.2.1 Operation. During ciphered transmissions, audio from the aircrew's microphone is routed
through the ACI panel to the DCS where it is encrypted. During reception of ciphered information, the
ciphered audio is deciphered by the DCS. The deciphered audio is routed back through the ACI panel
to the aircrew's headset.
23.6.2.2 DDI Controls. Control of the internal DCS cryptographic functions is performed via the
DCS KEY display from the UFC. The DCS KEY display is accessed by selecting DCS on the SUPT
menu, then selecting DCSKY on the NETS (network) display. See figure 23-20. The functions
displayed are crypto keys (KEY1 thru KEY6) and TD (time delay). In F/A-18F aircraft, if one cockpit
has the DCS KEY display accessed, the other cockpit can access it by selecting only DCS on the SUPT
menu.
23.6.2.2.1 TD Control. The time delay mode is enabled by selecting/boxing TD on the DCS KEY
display. A subsequent selection disables time delay and removes the box. The effect of enabling time
delay mode does not take place until CPHR or CPDP has been selected via the UFCD.
23.6.2.2.2 Crypto Key Options. There are six available crypto keys. For example, if KEY1 is loaded
with crypto key data, the option KEY1 appears on the display. If a crypto key has not been loaded with
data, that key option is not displayed. A selected crypto key is indicated with a box around the
corresponding option. Only one crypto key may be selected at a time.
The DCS KEY display initializes to the previously selected crypto key. If the last crypto key selected
has been zeroed, the system selects the next available loaded crypto key. The DCS KEY display
defaults with KEY1 selected.
If CPHR or CPDP is selected and the normal default crypto key has been zeroized, NO FILL is
displayed on the UFCD scratchpad. When the DCS KEY display is selected, NO FILL is removed from
the scratchpad. If no crypto keys are loaded, no crypto key options are displayed and a NO KEYS
status appears.
If CPHR or CPDP is selected prior to entering the DCS KEY display, an additional DCS COMSEC
status check is performed upon selection of a crypto key. This check takes approximately 1.5 to 2
seconds. If the DCS COMSEC function is operational there is no change on the DCS KEY display. The
　
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