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The RMU controls all of the VHF COM tuning functions and allows emergency tuning by the FMS.
When an FMS tunes the radios, the digital signals from the FMS enter the system where they act in
much the same manner as if the RMU tuning knob was being operated. This will allow the FMS to
enter into the system in an organized manner. For FMS operation, refer to Pilot’s Operating Manual
Pub No A 28-1146-116-00.
The audio section of the VHF COM provides SELCAL outputs used for airplane addressing by
transmitting tones across a VHF COM channel.
VHF 1 and 2 Communications Systems
Two separate, but identical, narrow band width VHF communications systems (VHF 1, VHF 2)
which can be operated separately or simultaneously, are provided. These systems are used to
provide AM voice communication between the airplane and a ground station and/or another
airplane. Frequency tuning and mode selection is by CRT pages and controls on the RMU.
The integrated communications units with transceivers (located in the forward fuselage avionics
bay) provide VHF communication (VHF COM) and Mode S Transponder data link capabilities. The
communication transceiver tuning range is as follows:
System Frequency Range Channel Spacing
VHF 1 and 2 118.00 to 151.975 MHz 8.33 kHz
VHF 3 Communications System (On airplanes with SB 700-23-002 incorporated)
An optional VHF 3 is located in the forward fuselage avionics bay and is used primarily as a data
radio. It does not have an ATC transponder but has the capability of operating in the data mode as
well as the voice mode.
The RMU automatically senses when the optional third VHF COM radio is installed and adds a
menu selection to the MENU page. Control of frequency and operating mode is performed by the
RMU and FMS CDU. VHF COM 3 works in conjunction with the Data Link System as the data
radio. The communication transceiver tuning range is as follows:
System Frequency Range Channel Spacing
VHF 3 118.00 to 151.975 MHz 8.33 kHz
COMMUNICATIONS
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
06−10−6
INTEGRATED RADIO SYSTEM
The radio communications unit provides VHF communication (VHF COM) and Mode S Transponder
data link capabilities. It interfaces with the FMS, SELCAL, TCAS, HF, audio control panels and is
controllable from either RMU.
INTEGRATED RADIO SYSTEM SCHEMATIC
GF0610_012a
VHF NAVIGATION UNIT 1, 2
VHF COMMUNICATION
UNIT 1, 2, (Optional) 3
VOR/LOC, GS, DME, MKR
BCN, ADF ANTENNAS
TRANSPONDER
ANTENNAS
VHF 1, 2, (Optional) 3
ANTENNAS
EMERGENCY
TUNING
FMS
AUDIO
INTEGRATING
UNIT 1, 2, 3
SELCAL HF
RADIO
MANAGEMENT
UNIT 1, 2, 3
TCAS
DIGITAL AUDIO
AUDIO
AUDIO
AUDIO
VOICE VOICE
MICROPHONES
LOUD SPEAKERS
HEADPHONES
INTERPHONES
EMERGENCY
AUDIO/VOICE
REMOTE TUNING
MARKER SENSITIVITY
COMMUNICATIONS
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−7
RADIO MANAGEMENT UNIT (RMU) DISPLAY
The following is a description of the panel controls and information available on the RMU.
GF0610_013
Transfer Key
Tuning Knobs
Function Keys
Cursor Box
Photo Sensor
Line Select
Keys
Main Tuning Page
COM1 NAV1
ATC/TCAS ADF1
TCAS DSPY 1 HF1
NB
MEMORY−1
STANDBY
ALT:
118.00
131.27
TEMP−1
131.10
112.00
1605
ANT
620.0
REL
NORMAL 2000
2000
LV
GF0610_014
RMU 1 (Pilot’s) RMU 2 (Copilot’s)
118.02
MEMORY−4
ALT:
MEMORY−1
110.00
NB
REL
NORMAL
STANDBY ADF
LV
TCAS DSPY 2
ATC/TCAS ADF2
HF2
COM2 NAV2
121.82 117.45
1200 1799.5
15423
15600
NB
REL
NORMAL
STANDBY ADF
LV
118.02
MEMORY−4
ALT:
MEMORY−1
110.00
ATC/TCAS ADF1
TCAS DSPY 1 HF1
COM1 NAV1
121.82 117.45
1200 1799.5
15423
15600
PILOT’S
WINDOW
Contains the
following:
COM 1
NAV 1
ATC/TCAS
ADF 1
TCAS
DSPY 1
HF 1
COPILOT’S
WINDOW
Contains the
following:
COM 2
NAV 2
ATC/TCAS
ADF 2
TCAS
DSPY 2
HF 2
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−8
RADIO MANAGEMENT SYSTEM
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