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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 06.10.7
Oct 05/06
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.
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