ACARS System Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.20.7
Copyright . The Boeing Company. See title page for details.
5.TOC.0.2  August 1, 2003
737 Operations Manual
Communications
Controls and Indicators

VHF Communication Panel
1
1
TFR
2
V FREQ SEL
H
F

3
1 As installed
AFT ELECTRONIC PANEL
1 VHF Communications Transfer (TFR) Switch
Selects which frequency as active for the transceiver.
2 Frequency Indicator
Indicates selected frequency.
3 Frequency Selector
Rotate – selects frequency in related indicator: . outer selector changes three left digits
. inner selector changes two right digits.
4 Active Frequency Light
Illuminated (white)–indicates related frequency is selected.
Chapter 5
Section 10

C
O
M
M

Communications -Controls and Indicators
737 Operations Manual
1
5
1
TFR
2
CV
FREQ SEL
OH MF M
3
COMM TEST
4
1 As installed
AFT ELECTRONIC PANEL
1 VHF Communications Transfer (TFR) Switch
Selects which frequency as active for the transceiver.
2 Frequency Indicator
Indicates selected frequency.
3 Frequency Selector
Rotate – selects frequency in related indicator: . outer selector changes three left digits
.  inner selector changes two right digits.
4 Communication (COMM) TEST Switch
Push –
.  
removes automatic squelch feature, permitting reception of background noise and thereby testing receiver operation

.  
improves reception of weak signals.

5 Active Frequency Light
Illuminated (white)–indicates related frequency is selected.
Copyright . The Boeing Company. See title page for details.
5.10.2   December 1, 2000

Communications -Controls and Indicators 737 Operations Manual

VHF Communications Transfer (TFR) Switch
Selects which frequency as active for the transceiver.

Frequency Indicator
Indicates selected frequency.
. A shutter covers inactive frequency.

Frequency Selector
Rotate – selects frequency in related indicator: . outer selector changes three left digits
. inner selector changes two right digts.

Communication (COMM) TEST Switch
Push –
.  
removes automatic squelch feature, permitting reception of background noise and thereby testing receiver operation

.
improves reception of weak signals.

Communications -Controls and Indicators 737 Operations Manual

HF Communication Panel

Frequency Selector
Rotate – selects frequency.

Mode Selector
OFF – transceiver not powered.
USB (Upper Sideband) – transmits and receives on higher side of frequency.
LSB (Lower Sideband) – transmits and receives on lower side of frequency.
AM (Amplitude Modulation) – transmits and receives on selected frequency with

a carrier wave.

Frequency Indicator
.
indicates selected frequency

.
frequency range from 2,000 to 29,000 megahertz.

RF/HF Sensitivity Control
Rotate–controls sensitivity of receiver.
.
(clockwise) increases sensitivity for reception of weak or distant stations

.
(counterclockwise) decreases sensitivity to reduce noise and static.

Note:  decreasing sensitivity too far prevents reception, including SELCAL monitoring of HF radio.
Copyright . The Boeing Company. See title page for details.
5.10.4   December 1, 2000
Communications -Controls and Indicators
737 Operations Manual
3
RF SENS
1 4
H
F

USB
1
OFF AM
2
1 As installed
AFT ELECTRONIC PANEL
1 Frequency Selector
Rotate – selects frequency.
2 Mode Selector
OFF – transceiver not powered.
USB (Upper Sideband) – transmits and receives on higher side of frequency.
AM (Amplitude Modulation) – transmits and receives on selected frequency with a carrier wave.
3 Frequency Indicator
.
indicates selected frequency

.
frequency range from 2,000 to 29,000 megahertz.

4 RF/HF Sensitivity Control
Rotate–controls sensitivity of receiver.
.
(clockwise) increases sensitivity for reception of weak or distant stations
　
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