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• RTU and reversionary/inhibit panel are described in radio tuning system
COMMUNICATIONS
Description
Vol. 2 06−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
HF COMMUNICATION SYSTEM (CONT'D)
HF Communication System − Block Diagram
Figure 06−10−4
COMMUNICATIONS
Description
Vol. 2 06−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
RADIO TUNING SYSTEM
Description
The radio tuning system provides integrated control of airplane communication and navigation
radio subsystems. It supports full cross-side and reversionary tuning, thus allowing single-point
control of both on-side and cross-side radios from the pilot or copilot positions.
Components and Operation
The radio tuning system consists of the following components:
• Two radio tuning units (RTUs)
• One reversionary/inhibit panel
For the flight management system (FMS) tuning of communications, refer to Chapter 17,
Navigation Systems, under the heading “TUNE PAGE” in the FMS section.
Controls and Indicators
Radio Tuning (RTU)
Line Select Keys
The RTU has eight panel-mounted line select keys adjacent to the display, four on the left and
four on the right of the display. Each key has a mechanical, momentary, non-latching action.
The functions performed by these keys vary with each display presented.
Dedicated Pushbuttons (IDENT, DME-H and 1/2)
There are three dedicated function pushbuttons on the RTU. These pushbuttons have
mechanically, momentary, non-latching action, but may have latched functions implemented by
system software.
Tune Knob Cluster
Two concentric knobs are used to tune frequencies (or select codes) for the RTU – both knobs
are rate-aided. The functions controlled by the tuning/code knobs include:
• Active frequency/code
• Preset frequency/code
• Numbered preset channels in the preset field only
• HF COM squelch/emission mode values
The function to be tuned is selected using the line select keys. A tuning window is displayed
around the frequency/code to be tuned to confirm the selection.
Tuning Window
The tuning window is displayed as a rectangle around the frequency/code to be tuned or
modified. The default position for the tuning window on the primary top level display is the VHF
COM preset frequency.
NOTE
When no activity is detected from the line select keys or tuning/code
knobs for 20 seconds, the display page reverts to the primary top level
display and the tuning window is placed at the default position.
COMMUNICATIONS
Description
Vol. 2 06−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
RADIO TUNING SYSTEM (CONT'D)
Radio Tuning Unit
Figure 06−10−5
Active and Preset Frequencies/Code
The preset frequency/code appears on the right side of the subdisplay. If the preset
frequency/code has been tuned or otherwise modified, PRE annunciator is displayed above it.
If the active and preset frequencies/codes are swapped, a RECALL annunciator appears
above the preset frequency/code. Additionally, if the tuning window surrounds the preset
frequency/code, an arrow appears to the right of the PRE or RECALL annunciator to indicate
that the next press of the associated line select key will cause the active and preset
frequency/code to swap.
Reversionary/Inhibit Panel
The reversionary/inhibit panel allows selective deactivation of either or both RTUs, and/or
inhibits the FMS from tuning the COM/NAV systems.
COMMUNICATIONS
Description
Vol. 2 06−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
RADIO TUNING SYSTEM (CONT'D)
Reversionary/Inhibit Panel
Figure 06−10−6
Operation
The operation of the RTU is presented in a sequence that shows the top page followed by the
hierarchy of the selected system.
Display Hierarchy
The RTU display is two-level tiered for the VHF COM/NAV, ADF, ATC and TCAS systems as
follows:
• Primary top level display
• Main display page
The RTU display is three-level tiered for the auxiliary VHF COM (3) transceiver as follows:
• Primary top level display
• Secondary top level display
• Auxiliary VHF COM main
The RTU display is four-level tiered for the HF COM system as follows:
• Primary top level display
• Secondary top level display
• HF COM main
• Number preset pages
COMMUNICATIONS
Description
　
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