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contain the receiving, transmitting and processing circuits required for operation of the
systems. Each unit interfaces with its antenna coupler to control the antenna tuning.
They also send signals to the audio control unit for microphone, headphone, speaker
operation and ADF. <0060>
The HF receiver/transmitters are installed in the aft equipment compartment and
contain the receiving, transmitting and processing circuits required for operation of the
systems. Each unit interfaces with its antenna coupler to control the antenna tuning.
They also send signals to the audio control unit for microphone, headphone, speaker
operation, ADF and SELCAL decoder. <0060><0010>
The antenna coupler is installed in the aft equipment compartment and tunes the
antenna to the selected frequencies. To reduce tuning time, the tuning data for a
frequency that was tuned previously is stored in the unit memory. <0011>
REV 56, Jan 31/03
Vol. 1 05--35--2
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
The antenna couplers are installed in the aft equipment compartment and tune the
antenna to the selected frequencies. To reduce tuning time, the tuning data for a
frequency that was tuned previously is stored in the unit memory. <0060>
The antenna is an integral part of the leading edge of the vertical stabilizer and is
connected to the antenna coupler. <0011>
The antenna is an integral part of the leading edge of the vertical stabilizer and is
connected to each antenna coupler. <0060>
The system operates in simplex or half--duplex modes using the following three types of
modulation: <0011>
The systems operate in simplex or half--duplex modes using the following three types of
modulation: <0060>
-- LV (Lower Voice Single Sideband)
-- UV (Upper Voice Single Sideband)
-- AM (Amplitude Modulation).
The HF frequency and modes of operation are controlled and monitored from the Top
Level page of RTU No. 2, which displays the frequency, and mode of operation. The HF
line key on the lower right side and the rotary frequency tuning knobs are used to select
the frequency and control the mode of operation. <0011>
The frequency and modes of operation for each HF system is controlled and monitored
from the Top Level page of the respective RTU, which displays the frequency, and
mode of operation. The HF line key on the lower right side and the rotary frequency
tuning knobs are used to select the frequency and control the mode of operation. <0060>
Before transmitting, the antenna must be tuned to the selected frequency through the
antenna coupler. The coupler tunes to the new frequency when the HF push-to-talk
(PTT) switch is pushed momentarily. When the coupler is tuning, a steady 1000-Hz tone
is heard in the headphone. The tone stops when the coupler is tuned. If a fault occurs,
a beeping tone is heard.
There are two main HF pages HF COM and HF PRESET for system operations. These
pages are accessed in sequence from the top-level page when the HF line key is
pushed. The main pages display the HF active frequencies, modes of operation, and
the preset frequency channels.
The HF system is also coupled to the SELCAL decoder to monitor the selected HF
frequencies for the aircraft unique SELCAL code.<0010><0011>
The HF systems are also coupled to the SELCAL decoder to monitor the selected HF
frequencies for the aircraft unique SELCAL code. <0010><0060>
Vol. 1 05--35--3
REV 56, Jan 31/03
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
Single HF Communication Interface Diagram <MST>
Figure 05---35---1
INHIBIT
SWITCHES
HF TRANSCEIVER
28 VDC
BUS 2
CB2--E10 HF COUPLER
CONTROL IN
CONTROL OUT
CONTROL OUT
RF
CONTROL IN
SELCAL AUDIO
ARINC 429
ADF 2
28 VDC
BUS 2 CB2--E9
CB2--E8
RX AUDIO
MIC AUDIO
PTT
RF
ADF 1
AUDIO
INTEGRATING
SYSTEM
SELCAL
DECODER
SELCAL
ANTENNA
HF
HF
HF
<0010>
REV 56, Jan 31/03
Vol. 1 05--35--4
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
Dual HF Communication Interface Diagram <MST>
Figure 05---35---2
INHIBIT
SWITCHES
28 VDC
BUS 2
CB2--E10 HF COUPLER 2
CONTROL IN
CONTROL OUT
CONTROL OUT
RF
CONTROL IN
SELCAL AUDIO
ARINC 429
28 VDC ADF 2
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