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Both HF radios use a common antenna. When either HF radio is transmitting,
the antenna is disconnected from the other HF radio, and it cannot be used to
transmit or receive. However, both HF radios can receive simultaneously if
neither is being used for transmitting.
COMMUNICATIONS
737 Sec. 6.5 Page 29
Flight Manual Continental Rev. 11/15/02 #41
HF COMMUNICATION SYSTEM – GENERAL DESCRIPTION
General
The HF communication system has two HF systems. Each system has these
components:
· Radio communication panel
· HF transceiver
· HF antenna coupler
· Common or shared HF antenna.
Description
The HF communication system interfaces with these components:
· Audio control panel (ACP)
· Remote electronics unit (REU)
· SELCAL decoder
· Flight data acquisition unit.
The REU receives HF radio selection and volume control from the ACP.
The HF transceiver receives microphone (mic) audio from the REU. Receiver
audio goes from the HF transceiver, through the REU, to the flight interphone
speakers and headsets.
The HF transceiver supplies the received audio to the SELCAL decoder. The
SELCAL decoder monitors the audio for SELCAL calls that come from the
airline ground operations.
The HF transceiver supplies a key event to the flight data acquisition unit for
key event marking.
Electrical Power
The 115v AC transfer (XPR) bus supplies power to the HF transceiver.
COMMUNICATIONS
Sec. 6.5 Page 30 737
Rev. 11/15/02 #41 Continental Flight Manual
COMMUNICATIONS
737 Sec. 6.5 Page 31
Flight Manual Continental Rev. 11/15/02 #41
HF COMMUNICATION SYSTEM – OPERATION
General
These components are used to operate the HF radio:
· Hand microphone or headset
· Radio communication panel
· Audio control panel.
COMMUNICATIONS
Sec. 6.5 Page 32 737
Rev. 11/15/02 #41 Continental Flight Manual
Receive Operation
The radio communication panel and the audio control panel are used to receive
transmissions on the HF radio.
On the audio control panel, push the receiver volume control for the HF radio.
Turn the control to adjust the volume from the HF radio.
Use the ON / OFF control to turn on the radio communication panel. When first
turned on, the radio communication panel tunes the VHF radio. Push the HF 1
switch to make the radio communication panel tune the HF radio. A light above
the switch comes on to show which radio the panel controls. The HF radio uses
the frequency in the active frequency display.
Use the HF sensitivity (HF SENS) control on the radio communication panel to
adjust the sensitivity of the HF radio receiver.
Verify amplitude modulation (AM) is not selected.
Transmit Operation
WARNING: Make sure personnel stay a minimum of six feet away from
the vertical stabilizer when the HF system transmits. RF
energy from the HF communication antenna can cause
injuries to personnel.
WARNING: Do not operate the HF communication system while fueling
the aircraft. Injury to persons and damage to equipment can
occur.
Make sure the active frequency display shows a valid transmit frequency.
Listen for transmissions on the selected frequency. When the frequency is clear,
push and release the push-to-talk for the microphone prior to communication.
This causes the HF coupler to tune to the transmission frequency. While the
coupler tunes, the HF transceiver supplies a 1 kHz tone.
Normally, it takes several seconds for the coupler to tune. When the 1 kHz tone
stops, the HF system is ready to transmit.
Transmit the message when frequency is clear. A 1Mz side tone will be heard
in the headphone along with a muted side tone in the speaker, if selected. The
flight interphone system mutes the side tone to the speaker system when the
boom microphone or hand microphone is used. Transmitting or receiving can
continue on the selected frequency.
COMMUNICATIONS
737 Sec. 6.5 Page 33
Flight Manual Continental Rev. 11/15/02 #41
When you select another frequency, and key the microphone, the HF coupler
tunes, and the 1Mz tone sounds again.
Non-Normal Indications
If the 1Mz tone continues for more than 15 seconds, when the coupler tunes,
there may be a coupler fault.
If the tone lasts only as long as the keyed microphone, the tuned frequency is
outside the frequency range for the HF transceiver.
COMMUNICATIONS
Sec. 6.5 Page 34 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
COMMUNICATIONS
737 Sec. 6.5 Page 35
Flight Manual Continental Rev. 11/15/02 #41
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