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SUP
H
TCELES
COM1 NAV1 ATC1/TCAS ADF1 HF1 COM3 COM2
118.000 108.00 7777 1799.5 118.000 118.000
118.000 108.00 STBY 190.0 2.0000 118.000 118.000
ABV
TX 2.0000 AM
REV 1
COMMUNICATIONS
Volume 2 Flight Crew Operating Manual Sep 13/2004
06-01-08 CSP 100-6 REV 1
VHF COMMUNICATION (Cont)
DISPLAY CONTROL PANEL COM RADIO OPERATION (Cont)
When the FREQ SEL setting is changed to 8.33, the recall COM radio frequency display resolution on the MFDs is three
decimal places for that radio. If the prior recall frequency had two decimal places, the MFD adds the appropriate 0 or 5 to
the frequency value. When the FREQ SEL setting is changed to 25, the recall COM radio frequency display resolution on
the MFDs is 2 decimal places for that radio. If the prior recall frequency had an 8.ss kHz frequency, the MFD changes the
frequency to the next lower valid 25 kHz frequency value. If the prior recall frequency was a 2 digit 25 kHz frequency, the
third decimal digit is removed.
CONTROL DISPLAY UNIT (CDU)
The control display unit (CDU) is also capable of tuning the communication radios, ADF receivers, and ATC transponders.
CDU COM RADIO TUNING
The CDU provides tuning control of both the on-side and cross-side radios. Data entry to the CDU is made through the
scratch pad and the line select keys. Information is entered on the scratchpad, then transferred to the appropriate location
with the adjacent line select key. Messages show if the information entered is not appropriate for the data field. Access to
CDU tuning is accomplished through the TUNE page.
To tune the radio using the CDU execute the following steps:
1. Push the TUN key on the CDU to show the TUNE page.
2. To tune a radio directly, do one of the following steps:
- Enter the frequency into the scratch pad, then push the line select key for the appropriate radio.
- Enter a preset channel number (1 through 20) into the scratch pad, then push the line select key for the appropriate
radio.
- NAV radios only: Enter the three-letter identifier for the NAVAID, then push the line select key for the appropriate
radio (NAV 1 or NAV 2).
3. To show the submenu for a particular radio (to set presets, select modes, etc.), push the line select key for the radio
when the scratch pad is empty.
4. To return to the TUNE page from a CONTROL submenu, push the line select key for the radio or push the TUN
key.
CFO1101002_010
MSG
DIR FPLN LEGS
DEP
ARR PERF
MFD
MENU
MFD
ADV
MFD
DATA
PREV NEXT
EXEC
IDX
TUN
CLR
DEL
BRT
DIM
A B C D E F G
H I J K L M N
O P Q R S T U
V W X Y Z SP /
1 2 3
4 5 6
7 8 9
. 0/ +/-
COMMUNICATIONS
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 06-01-09
VHF COMMUNICATION (Cont)
TUNING REVERSION
DESCRIPTION
The tune reversion switch is located on the reversion panel located on the center pedestal. The COM 1 121.5 MHz switch
allows the pilot to directly transmit on the emergency frequency 121.5 MHz via COM 1. The MFD ONLY position on the
TUNE switch allows the radio to be tuned by using the display control panel only. The NORM position on the TUNE switch
allows the radio to tuned using either the display control panel or the central display unit. The CDU ONLY position on the
TUNE switch allows the radio to be tuned by using the central display unit only.
COMPONENTS AND OPERATION
Tuning reversion allows the pilot to select the MFDs or CDUs as the master tuning control. Normally, the MFD provides
the master tuning control. However, if the MFD fails or is reverted to a compressed PFD format, radio tuning through that
MFD is no longer available. Tuning reversion allows the pilot to select either the MFD or the CDU as the master tuning
control for the on-side radios. When the TUNE knob on the Reversion Selection Panel is set to MFD ONLY, the MFDs
ignore tuning commands from the CDUs. Additionally, the CDU TUNE page is blank when the TUNE knob is set to MFD
ONLY. When the TUNE knob is set to CDU ONLY, the CDUs ignore tuning commands from the MFDs and the MFD radio
Menus is blanked. When the TUNE knob is in the COM 1 121.50 position, tuning is as normal (MFD is the master tuning
control), but the COM 1 radio is forced to the emergency frequency 121.50.
HF RADIO COMMUNICATION (OPTIONAL)
DESCRIPTION
The optional high-frequency radio provides long-range communication within the frequency range of 2.0 to 29.9999 MHz.
The HF radio has 280 000 communication channels together with six emergency and 16 programmable preset channels.
The HF system operates in simplex or duplex mode as:
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Bombardier_Challenger_Global_00-Communications(5)
