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The TUNE MODE control selects the HF tuning mode as follows:
1.
Tune directly by tuning a frequency (FREQ).
2.
Select an emergency channel (EMER).
3.
Select a maritime (optional) channel (MAR).
CDU HF RADIO TUNING
To tune the HF radio using the CDU, do the following steps:
1.
Push the TUN key on the CDU to show the TUNE page.
2.
Select page 2 by selecting NEXT button (depending on radio options, there will be 1 or 2 pages).
3.
Enter the frequency into the scratchpad, then push the line select key for the appropriate radio.
or
4.
Enter a preset channel number (1 thru 20) into the scratchpad, then push the line select key for the appropriate radio.
5.
To show the submenu for a particular radio (to set presets, select modes, etc.), push the line select key for the radio when the scratchpad is empty.
6.
To return to the TUNE page from a submenu, push the line select key for the radio or push the TUN key.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
06-01-10 HF RADIO COMMUNICATION (Cont)
PRESET PAGE
In the tune mode, PRESET allows the pilot to select and configure 16 predetermined combinations of transmit and receive frequencies and transmission modes on the CDU PRESET pages or on the MFD radio control pages. Five CDU preset pag-es are available for each HF1 (HF1 and HF2), depending on the type of preset data and selected HF mode of operation. Selection of the preset mode changes the HF preset frequency to the last selected numbered preset selection.
SIMPLEX/DUPLEX OPERATION
The simplex/duplex mode selection is applicable to all modes of transmission. Simplex mode allows transmission and re-ception to occur on only one frequency and in only one direction at a time. Both parties cannot receive at the same time as they are transmitting. The duplex mode is actually half-duplex mode allowing transmission and reception on separate fre-quencies, but still only one direction at a time.
SELCAL SYSTEM (OPTIONAL)
DESCRIPTION
The optional SELCAL system allows the crew to maintain continuous VHF or HF radio watch with a ground facility with-out the burden of listening to the assigned radio.
COMPONENTS AND OPERATION
The selective calling (SELCAL) system monitors the pre-assigned SELCAL VHF or HF frequency. Each SELCAL equipped aircraft is assigned its own four-letter SELCAL code. When the ground station wants to talk to the aircew, they transmit the aircraft’s assigned SELCAL code.
When the VHF or HF radio receives the code, the SELCAL decoder sends a signal to the EICAS data concentrator unit to display the cyan advisory message. The advisory message identifies which of the VHF or HF systems received the message. An aural “SELCAL” alert is sounded to advise the crew of the incoming call.
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