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23.2.1.1.2 COMM 1 and COMM 2 Channel Select Knobs. Operation of the COMM 1 or COMM 2
select knobs is not dependent on the operation of the MPCD or UFCD. Clockwise rotation of either
COMM channel select knob changes the associated COMM 1 or COMM 2 preset channel selections in
the order:
1. CH (1 thru 20) one of twenty preset channels,
2. CH G (guard channel),
3. CH M (manual frequency selection mode),
4. CH C (cue channel/frequency for Single Channel Ground and Airborne Radio System) (SINCGARS),
5. CH S (ship maritime).
Continued clockwise rotation repeats the change sequence. Counterclockwise rotation reverses the
change sequence. Rotating either COMM select knob to CH G tunes the associated radio to 243.0 MHz
UHF. To communicate on a guard frequency other than 243.0 MHz UHF, a different guard frequency
must be manually entered. Rotating either knob with any AJ MENU sublevel selected returns the
UFCD to the COMM sublevel.
23.2.1.1.3 COMM Keypad Options and Scratchpad Display. In the top level CNI format twelve
keypad options and a scratchpad display may be used to change the CH 1 thru 20 preset channel
numbers, CH G (guard) frequency, CH M (manual frequencies), CH C (cue channel/frequency) or CH
S (ship maritime frequencies). The keypad options are 0 thru 9, CLR (clear) and MAN (manual).
23.2.1.1.4 COMM Touch Option/Displays. On the top level CNI format ten touch option/displays
may be used to select COMM 1, COMM 2, or other sublevel formats. The upper right and lower right
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VII-23-3 ORIGINAL
touch option/displays are dedicated to the COMM 1 and COMM 2 radios respectively. Selecting other
sublevel formats does not remove the COMM 1 and 2 touch option/displays.
The COMM 1 and COMM 2 channel displays are also utilized to visually identify which audio
sources are currently active. When an active radio transmission is occurring, the upper half of the
COMM 1/2 option is background shaded. When an active MIDS transmission is occurring, the lower
half of the COMM 1/2 option is background shaded.
The remaining eight touch option/displays are:
1. D/L, BCN, ILS (data link, beacon and instrument landing system),
2. A/P (auto pilot),
3. TCN (TACAN with channel number),
4. IFF (identification friend or foe with mode numbers),
5. DDI (digital display indicator),
Figure 23-1. Top Level CNI Format on Up Front Control Display (UFCD)
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VII-23-4 ORIGINAL
6. RALT (radar altimeter with altitude reading),
Channels 10 and 20 are valid entries for Low Altitude Warning settings.
Due to the close proximity of the COMM 1 and RALT touch options/
displays, it is possible to inadvertently change the low altitude warning
setting for the radar altimeter when using COMM 1 fast data entry.
7. EW (electronic warfare),
8. FLR (forward looking infrared radar).
23.2.1.1.5 UFCD OFF/BRT (Brightness) Control Knob. The OFF/BRT control knob adjusts the
overall brightness of the UFCD for both symbology and video. Clockwise rotation from OFF applies
power to the UFCD and progressively increases brightness. Counterclockwise rotation to OFF removes
power from the UFCD. The UFCD does not need to be powered for COMM 1 or 2 to function.
23.2.1.1.6 UFCD CONT (Contrast) Control Knob. Clockwise rotation of the CONT control knob
increases video contrast. Counterclockwise rotation decreases video contrast.
23.2.1.1.7 UFCD SYM (Symbology) Control Knob. Clockwise rotation of the SYM brightness
control knob increases the brightness of the UFCD symbology only. Video brightness is not affected by
this knob.
23.2.1.1.8 EMCON - Emission Control Pushbutton. The EMCON pushbutton switch may be used
to terminate all onboard emitters except COMM transmitters and ALQ-165. If emergency is selected
on the ACI panel, the IFF and D/L respond with emergency, if interrogated. When EMCON is selected
with the EM CON pushbutton switch, emission can be restored only with this switch. When EMCON
is selected with the sensor control switch, emission can be restored with the sensor control switch or the
EM CON pushbutton switch. During EMCON operations, EMCON is displayed in the scratchpad for
top level CNI display or vertically in the left options for DDI displays on the UFCD.
23.2.1.2 COMM Control Panel. The COMM control panel is on the left console. The switches which
are used for VHF/UHF operation are the COMM relay switch and the COMM G XMT select switch.
23.2.1.2.1 RLY (Relay) Switch. The RLY switch, located on the COMM control panel, is used to
enable relay communications by allowing information received through one radio to be routed to the
other radio for transmission. The switch must be placed in the OFF position prior to the initial
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NATOPS Flight Manual 飞行手册 2(74)
