Frequency Indicator
Displays tuned frequency
Frequency ranges from 2.000 to 29.999 megahertz.

Frequency Selectors
Rotate - selects desired frequency.

RF Sensitivity Control
Rotate - controls sensitivity of receiver
.
clockwise increases sensitivity of weak or distant stations

.
counterclockwise decreases sensitivity to reduce noise or static.

Mode Selector
OFF - removes power to transceiver
USB (Upper Sideband) - transmits and receives on the higher side of the frequency
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Communications -Controls and Indicators 737 Flight Crew Operations Manual

AM (Amplitude Modulation) - transmits and receives on the selected frequency, accompanied by a carrier wave.
Audio Control Panel (ACP)
YA686, YA687

FLIGHT DECK CREW STATIONS
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Communications -Controls and Indicators 737 Flight Crew Operations Manual
YA809, YC411 - YD655

YA721 - YA803

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Communications -Controls and Indicators 737 Flight Crew Operations Manual

YC153, YC154

FLIGHT DECK CREW STATIONS
YA626

FLIGHT DECK CREW STATIONS
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Communications -Controls and Indicators
YK101 - YK104

YA613

Transmitter Selector (MIC SELECTOR) Switches
Illuminated – related switch is active
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Communications -Controls and Indicators 737 Flight Crew Operations Manual

Push –
.
selects related communication system for subsequent transmission

.  only one switch may be selected at a time; pushing a second switch
deselects first switch

.  
reception possible over selected system regardless of whether related
receiver switch is on.

SELCAL Light YA686, YA687
Illuminated - Accompanied by chime, alerts crew that communication is desired on indicated communication radio. Will automatically reset when microphone is keyed, control wheel mic switch is pressed or R/T-I/C switch is positioned to R/T.

Receiver Switches YA613, YA626, YA721 - YK104
Illuminated (white) – related switch is active
Rotate – adjusts volume
Push –
.
allows reception of related communication system or navigation receiver

.
multiple switches may be selected

Push again – deselects related system or receiver.

Push–to–Talk Switch YA626, YA721 - YK104
(spring–loaded to neutral position)
R/T (radio–transmit) – keys oxygen mask or boom microphone for transmission as selected by transmitter selector.
I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission over flight interphone and bypasses transmitter selector.

Push–to–Talk Switch YA613
(spring–loaded to neutral position)
RADIO (radio–transmit) – keys oxygen mask or boom microphone for transmission as selected by transmitter selector.
INT (Intercom) – keys oxygen mask or boom microphone for direct transmission over flight interphone and bypasses transmitter selector.
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Communications -Controls and Indicators 737 Flight Crew Operations Manual

Receiver Switches YA686, YA687
Illuminated (white) – related switch is active Rotate – adjusts volume Push –
.
allows reception of related communication system or navigation receiver

.
multiple switches may be selected Push again – deselects related system or receiver.

Filter Switch
V (Voice) – receive NAV and ADF voice audio.
B (Both) – receive NAV and ADF voice and range audio.
R (Range) – receive NAV and ADF station identifier range (code) audio.

MASK–BOOM Switch YA626, YA721 - YK104
MASK – selects oxygen mask microphone for transmissions. BOOM – selects boom microphone for transmissions.

Push–to–Talk Switch YA686, YA687
(spring–loaded to neutral position)
R/T (radio–transmit) – keys oxygen mask or boom microphone for transmission
as selected by transmitter selector.

I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission
　
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