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Rotate – Selects frequency in related indicator:
· Outer selector changes three left digits.
· Inner selector changes two right digits.
? Communication (COMM) TEST Switch
Push –
· Removes automatic squelch feature, permitting reception of
background noise and thereby testing receiver operation.
· Improves reception of weak signals.
@ Active Frequency Light
Illuminated (white) – Indicates related frequency is selected.
COMMUNICATIONS
Sec. 6.5 Page 24 737
Rev. 11/15/02 #41 Continental Flight Manual
BCD The VHF / HF RTP-1 is located on the forward left side of the aft
electronic panel, VHF / HF RTP-2 is on the forward right side and VHF / HF
RTP-3 is on the aft portion of the panel. The VHF-2 and VHF-3 antennae are
located on the lower fuselage, VHF-1 is on the upper fuselage.
RADIO TUNING PANEL
< Frequency Transfer Switch
Push –
· Transfers the STANDBY window frequency to the ACTIVE window and
tunes the selected radio to the new active frequency.
· Transfers the ACTIVE window frequency to the STANDBY window.
= Frequency Indicator
ACTIVE – Displays the tuned frequency of the selected radio.
STANDBY – Displays the pre-selected or previously tuned frequency of the
selected radio.
COMMUNICATIONS
737 Sec. 6.5 Page 25
Flight Manual Continental Rev. 11/15/02 #41
> Radio Tuning Switch
Push –
· Selects the VHF or HF radio to be tuned.
· The tuned frequency is displayed in the ACTIVE frequency indicator.
· The standby frequency is displayed in the STANDBY frequency indicator.
? Radio Tuning Panel Off (OFF) Switch
Push –
· Disconnects the panel from the communication radios.
· Switch illuminates (white).
@ HF Sensitivity Control
Rotate – Adjusts the sensitivity of the on-side HF receiver.
A Radio Tuning Light
Illuminated (white) – Indicates the selected radio.
B Offside Tuning Light
Illuminated (white) –
· The radio normally associated with this panel is being tuned by another
radio tuning panel, or
· The radio tuning panel is being used to tune a radio not normally
associated with this radio tuning panel.
C Frequency Selector
Rotate – Selects frequency in the STANDBY frequency indicator:
· First digit is always 1.
· Outer selector changes second and third digits in 1 MHz increments.
· Inner selector changes fourth, fifth, and sixth digits in 25 KHz
increments.
COMMUNICATIONS
Sec. 6.5 Page 26 737
Rev. 11/15/02 #41 Continental Flight Manual
D Communication (VHF) Test (TEST) Switch
Push –
· Removes automatic squelch feature, permitting reception of
background noise and thereby testing receiver operation.
· Improves reception of weak signals.
AM Light
Illuminated (white) – HF AM is selected.
Extinguished – HF USB is selected.
AM Switch
Push – Sets the AM (amplitude modulation) or USB (upper side band)
mode for the selected HF.
COMMUNICATIONS
737 Sec. 6.5 Page 27
Flight Manual Continental Rev. 11/15/02 #41
Radio Tuning Panel Fail Modes
< INOP Indication
The selected radio is not available.
= PANEL FAIL
The radio tuning panel has failed.
Note: The selected frequencies may continue to be displayed in the
frequency indicator when the radio is not available.
COMMUNICATIONS
Sec. 6.5 Page 28 737
Rev. 11/15/02 #41 Continental Flight Manual
BCD HF COMMUNICATIONS
General
The high frequency (HF) communication system supplies voice communication
over long distances. It provides communication between aircraft or between
ground stations and aircraft.
The HF system operates in the aeronautical frequency range of 2 MHz to 29.999
MHz. The system uses the surface of the earth and an ionized layer to cause a
reflection (skip) of the communication signal. The distance between skips is
dependent on the time of day, radio frequency, and aircraft altitude.
There are two independent HF communication radios, designated HF 1 and HF
2. Each HF radio can be tuned by any radio tuning panel. HF radio sensitivity
can only be set on the on-side radio tuning panel.
The audio control panels are used to control voice transmission and receiver
monitoring. When an HF transmitter is keyed after a frequency change, the
antenna tunes. While the antenna is being tuned, a steady or intermittent tone
may be heard through the audio system (tuning takes a maximum of 15
seconds). The antenna is located in the vertical stabilizer.
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