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庞巴迪挑战者300公务机机组操作手册 Bombardier_Challenger-通讯(8)

时间:2011-11-02 15:22来源:蓝天飞行翻译 作者:公务机
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CFO1101002_010
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
06-01-08 VHF COMMUNICATION (Cont) TUNING REVERSION DESCRIPTION

The tune reversion switch is located on the reversion panel located on the center pedestal. The COM 1 121.5 MHz switch allows the pilot to directly transmit on the emergency frequency 121.5 MHz via COM 1. The MFD ONLY position on the TUNE switch allows the radio to be tuned by using the display control panel only. The NORM position on the TUNE switch allows the radio to tuned using either the display control panel or the central display unit. The CDU ONLY position on the TUNE switch allows the radio to be tuned by using the central display unit only.


COMPONENTS AND OPERATION
Tuning reversion allows the pilot to select the MFDs or CDUs as the master tuning control. Normally, the MFD provides the master tuning control. However, if the MFD fails or is reverted to a compressed PFD format, radio tuning through that MFD is no longer available. Tuning reversion allows the pilot to select either the MFD or the CDU as the master tuning control for the on-side radios. When the TUNE knob on the Reversion Selection Panel is set to MFD ONLY, the MFDs ignore tuning commands from the CDUs. Additionally, the CDU TUNE page is blank when the TUNE knob is set to MFD ONLY. When the TUNE knob is set to CDU ONLY, the CDUs ignore tuning commands from the MFDs and the MFD radio Menus is blanked. When the TUNE knob is in the COM 1 121.50 position, tuning is as normal (MFD is the master tuning control), but the COM 1 radio is forced to the emergency frequency 121.50.

HF RADIO COMMUNICATION (OPTIONAL) DESCRIPTION
The optional high-frequency radio provides long-range communication within the frequency range of 2.0 to 29.9999 MHz. The HF radio has 280 000 communication channels together with six emergency and 16 programmable preset channels.
The HF system operates in simplex or duplex mode as:
-Upper side band voice (UV)
-Upper side band data (UD)
-Lower side band voice (LV)
-Lower side band data (LD)
-Amplitude modulation equivalent (AME)
-Continuous wave (CW)
In simplex mode the radio transmits and receives on the same frequency. Simplex is the most common transmission/recep-
tion mode.
The duplex mode is similar to using a cellular phone in that you actually transmit on one frequency and receive on another.
It is used to relay radio signals between stations or communicate with marine facilities.

COMPONENTS AND OPERATION RECEIVER/TRANSMITTER
The receiver/transmitter is installed in the aft equipment bay. The receiver/transmitter controls all the functions associated with signal transmission and reception, power generation and fault detection.

HF COUPLER
The HF coupler is located near the receiver/transmitter. The coupler tunes the system by matching the impedance of the antenna to the transmitter. Matching the impedance allows maximum power transfer to the antenna during transmissions.
 
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