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- 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/reception
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.
The coupler tunes to the new frequency when the transmit switch is momentarily pushed. The tuning time for a new frequency
is nominally less than one second but can take up to a maximum of six seconds. A 1000 Hz tone is heard in the
headset and stops when tuning is complete. Impedance data for the previous last 50 frequencies tuned are stored in memory
and reused whenever a frequency is reselected. This minimizes the tuning times for frequently used frequencies.
HF ANTENNA
The HF antenna is classified as a conformal-type antenna in that it is an integral part of the leading edge of the vertical
stabilizer.
COMMUNICATIONS
Volume 2 Flight Crew Operating Manual Sep 13/2004
06-01-10 CSP 100-6 REV 1
HF RADIO COMMUNICATION (Cont)
DISPLAY CONTROL PANEL HF TUNING CONTROL
1. Push the RADIO button on the DCP to show the radio menu on the MFD if another menu/list is active.
2. Turn the MENU knob on the DCP to move the selection box to the HF radio (HF1 or HF2) display on the radio
menu.
3. Push the RADIO button on the DCP to show the HF CONTROL submenu on the MFD.
4. The following operations are performed on the HF CONTROL submenu.
- Select the HF tune mode.
-Turn the MENU knob to move the selection box to the MODE control
-Turn the DATA knob or push the PUSH SELECT button to select FREQ, EMER, or MAR mode. Each click of
the DATA knob or push of the button selects the next mode option
- Select the HF transmission mode.
-Turn the MENU knob to move the selection box to the MODE control
-Turn the DATA knob or push, the PUSH SELECT button to select SIMP (simplex) or DUP (duplex) transmission
mode
- Select HF emission mode.
-Turn the MENU knob to move the selection box to the emission mode control (beneath the MODE control)
-Turn the DATA knob or push the PUSH SELECT button to select LV (lower voice single sideband), UV
(upper voice single sideband), or AM (amplitude modulation) mode. Each click of the DATA knob or push or
the button selects the next mode option
- Select the HF squelch level.
-Turn the MENU knob to move the selection box to the SQUELCH control
-Turn the DATA knob or push the PUSH SELECT button to select the squelch level. Each click of the DATA
knob or push of the button selects the next squelch level option
- Select the HF power level.
-Turn the MENU knob to move the selection box to the POWER control
-Turn the DATA knob or push the PUSH SELECT button to select the squelch level. Each click of the DATA
knob or push of the button selects the next squelch level option
- Select the HF TEST mode.
-Turn the MENU knob to move the selection box to the TEST control
-Turn the DATA knob or push the PUSH SELECT button to select the TEST mode
MFD — HF CONTROL MENU
The HF CONTROL menu provides control for HF radio modes other than those available through the Radio Menu. Each
HF radio installed on the aircraft has its own HF CONTROL menu. The active frequency, recall frequency, and squelch
status that show on the left side of the HF CONTROL menu are identical to the HF display on the radio menu.
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
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