曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
two way communication. The audio control panels provide selection and control of the audio
outputs. <1012>
Transceiver tuning range is 118.000 to 136.975 MHz. Frequency tuning and mode selection
is done by two primary radio tuning units (RTU). Frequency tuning can also be done by a
backup standby tuning unit or the FMS control display unit.
A. Radio Tuning Unit
The radio tuning units and radio systems have an on-side relationship. RTU 1 monitors
and controls COM 1 and RTU 2 monitors and controls COM 2. In the event of total AC
power loss or failure of both radio tuning units, the backup tuning unit provides
reversionary control of COM 1.
Radio information is presented on two levels of the radio tuning units. The top level
page displays the overall status of all radios and allows the operator to make frequency
changes. A COM main page provides the means to change frequencies, codes and
operating modes.
The active VHF COM frequency is shown on the top left hand side of the radio tuning
unit top level page, while the preset frequency is displayed on the top right hand side.
Pressing the line select key adjacent to any frequency brings the tuning window to that
frequency. It is then possible to modify that frequency with the frequency select knobs.
Pressing the line select key adjacent to the preset frequency twice, swaps the active
frequency with the preset frequency. Pressing the line select key adjacent to the active
frequency twice, brings up the COM main page.
On the main page, pressing the line select key adjacent to the SQUELCH field toggles
the squelch ON or OFF. The selected state is displayed in large cyan letters. The
inactive state is displayed in smaller white letters.
If no entry is made on the main page within 20 seconds, the radio tuning unit display
will return to the default top level page. The operator can press the line select key next
to the RETURN line to return to the top level page at any time.
If the squelch is selected OFF, a SQ OFF message is displayed on the top level page.
Since Squelch ON is considered the normal operating mode it is not displayed on the
top level page. When a COM transceiver is transmitting, a TX annunciation is displayed
in cyan letters below and to the right of the active frequency field on the top level page.
The radio tuning units continuously monitor the status of the VHF COM transceivers
and if any discrepancy is detected between the commanded frequency and the actual
tuned frequency, the frequency indication is replaced by white dashes to warn the pilot
of the inconsistency.
Vol. 1 05--30--2
COMMUNICATIONS
Radio Communication System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
VHF Communication Interface
Figure 05---30---1
VHF/COMM 1
RX/TX
AUDIO
PTT
PORT A
PORT B
ECHO
PORT C
VHF/COMM 2
RX/TX
AUDIO
PTT
PORT A
PORT B
ECHO
PORT C
AUDIO ELECTRONIC
CONTROL UNIT
FMS
IAPS
X--TALK
AUDIO CONTROL PANELS
PTT TO
SELCAL
ANTENNA ANTENNA
TO RTU 2
TO RTU 1
Vol. 1 05--30--3
COMMUNICATIONS
Radio Communication System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Radio Tuning Unit <1012>
Figure 05---30---2
Radio Tuning Unit -- COM Main Page
Center Pedestal
TUNING KNOB
COM Key
Push key once to directly
tune active frequency
with tuning knobs.
Push key twice to select
COM main page.
TUNING
WINDOW
COM FREQUENCY
READOUT (GREEN)
SQ OFF Indicator
Displayed when squelch
is selected off.
TX Indicator
Displayed when
radio is transmitting.
COM FREQUENCY
READOUT (GREEN)
SQUELCH Key
Used to select squelch
on or off.
Selected setting is
displayed in cyan.
PRE or RECALL
PRE -- Frequency was
changed by tuning knobs.
RECALL -- Frequency was
swapped with active frequency.
Radio Tuning Unit -- Top Level Page
Center Pedestal
Vol. 1 05--30--4
COMMUNICATIONS
Radio Communication System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Backup (Standby) Tuning Unit
Under normal conditions the backup tuning unit is in standby mode and acts as a
system monitor displaying the echoed frequencies from the radios. The backup tuning
unit provides radio control in the event of the loss of both radio tuning units and the
flight management system. The active frequencies are stored in non-volatile memory
and can be recalled after a power interruption.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
庞巴迪挑战者手册2(95)
