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Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
COMMUNICATION RADIOS (CONT'D)
HF Communications
The HF communication system includes two high-frequency transceivers and two antenna
couplers, installed in the aft equipment compartment. The HF system provides long-range voice
communications in the frequency range of 2 to 30 MHz.
The antenna is an integral part of the leading edge of the vertical stabilizer. The antenna
couplers match the impedance of the transceivers to the antenna as different frequencies are
selected and keyed.
A selective call (SELCAL) decoder monitors the HF radios for coded, aircraft-specific calls from
a ground station. In the event that the decoder detects a ground station selective call, a SELCAL
HF 1 (2) advisory EICAS message is displayed, and a “SELCAL” audio alert is heard. The
EICAS message and alert are reset when a PTT switch is pushed for an HF system
transmission.
RADIO TUNING
Description
VHF and HF radio tuning is carried out primarily using the control display units (CDUs) associated
with the flight management system (FMS). Alternatively, the cursor control panels (CCPs) may be
used to control a tuning menu presented on the on-side MFDs.
All tuning input is provided directly to the associated radio, as well as to the integrated avionics
processing system (IAPS). The IAPS echoes the display of radio tuning information on all MFDs
and CDUs, regardless of the tuning method used.
CDU Tuning
Two FMS control display units (CDUs) are installed on the center pedestal. Each CDU is a liquid
crystal display, equipped with an integrated keyboard, function keys and line select keys. In
addition to FMS functions, the CDUs provide single point tuning and control of the on-side or
cross-side radios. Tuning of the VHF and HF radios is not possible by the optional third CDU.
COMMUNICATIONS
Description
Vol. 2 06−10−6
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
RADIO TUNING (CONT'D)
Flight Management System Control Display Units
Figure 06−10−4
TUNE Page
The TUNE pages are accessed by pressing the TUN function key on the left side of the CDU.
TUNE pages provide operational summaries and allow for primary control of all installed radios,
including COMM, NAV, ADF, TCAS, DME and ATC transponder. It should be noted that only
VHF and HF radio control and tuning is discussed here.
VHF radio titles, COM1 and COM2, are shown on page 1 of the TUNE page, while VHF COM3
is shown on page 2. HF radio titles HF1 and HF2 are also shown on page 2. CDU function keys
PREV and NEXT are used to move between the pages.
Active frequencies appear in green on the data line directly below the corresponding radio title.
RECALL or PRESET frequencies are shown in white below the active frequency.
HF and VHF radios can be tuned by making a frequency entry on the CDU scratchpad, followed
by pushing the radio’s line key. As a result, the active frequency line shows the new frequency.
The CDU also routes the frequency to the associated radio and to the integrated avionics
processing system (IAPS). The IAPS echoes the data presentation on the opposite CDU as well
as on the MFD radio tuning windows.
VHF radio frequency entry and display can be carried out using 25 kHz or 8.33 kHz tuning.
Since the VHF radios are capable of 8.33 kHz tuning, the CDU automatically adapts the display
to show a 5 or 6 digit frequency selection, according to the data being entered.
COMMUNICATIONS
Description
Vol. 2 06−10−7
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
RADIO TUNING (CONT'D)
When the tuning data is moved to the active frequency line, the existing active frequency is
displaced to the line below it, identified with the label RECALL. At any time, the crew may select
the RECALL line to switch the active and recall frequencies. The scratchpad must be empty
when these selections are made.
If the scratchpad tuning data is moved to the RECALL line rather than the active line, the
RECALL title changes to PRESET, indicating that this preset frequency is awaiting transfer to
the active line. Pressing the PRESET line key moves this frequency to the active frequency line,
and makes the previously active frequency a RECALL frequency.
Depending on the radio being tuned (VHF or HF), if an invalid entry is made, a message:
INVALID FREQUENCY, INVALID ENTRY or INVALID CHANNEL is displayed on the
scratchpad.
The TUNE page also allows the crew to enable or disable SELCAL system operation. The
adjacent line key is used to alternate between OFF and SELCAL. The SELCAL text enlarges
　
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