TM 1-1510-224-10
c.
Audio Control Panel (fig. 3-1), Controls and
Functions.
(1)
Master volume control. The master
volume control, placarded VOL, controls audio volume to
individual headsets.
(2)
Transceiver audio monitor controls. The
transceiver audio monitor controls, placarded RADIO
MON, 1 through 5, are used to select which transceiver's
received audio will be heard in the pilot's or copilot's
respective headset, and its volume. These controls are
of the push on, pull off type. Clockwise rotation of a
control increases audio volume to headset.
(a)
RADIO MON 1. Connects user's
headset to audio from VHF-AM transceiver number 1.
(b)
RADIO MON 2. Connects user's
headset to audio from VHF-AM transceiver number 2, or
VHF-FM (SINCGARS) transceiver, as selected by the
FM/AM alternate communication selector switch.
(c)
RADIO MON 3. Connects user's
headset to audio from # 1 UHF transceiver.
(d)
RADIO MON 4. Connects user's
headset to audio from HF or VOW transceivers.
(e)
RADIO MON 5. Connects user's
headset to audio from # 2 UHF transceiver (BU VOW).
(3)
Navigation
receiver
audio
monitor
controls. The navigation receiver audio monitor controls,
placarded RADIO MON, A and B, are used to select
which navigation receiver's audio will be heard in the
pilot's or copilot's respective headset, and its volume.
These controls are of the push on, pull off type.
Clockwise rotation of a control increases audio output to
headset.
(a)
NAV A. Connects user's headset to
audio from VOR # 1, VOR # 2, and marker beacon
number 1.
(b)
: NAV B. Connects user's headset
to audio from TACAN, marker beacon # 2, and ADF
receivers.
(4)
Microphone impedance selector switch.
The microphone impedance selector switch, placarded
MIC, 1, 2, allows selection of impedance to match
microphone being used. Select MIC 1 position for 5 ohm
microphones, and MIC 2
position
for
150
ohm
microphones.
1.
Master Volume Control
2.
Transceiver Audio
Monitor Controls
3.
Navigation Receiver
Audio Monitor Controls
4.
Microphone Impedance
Selector Switch
5.
Transmitter-Intercom
Selector Switch
6.
Intercom Mode
Selector Switch
A93FE00D0096 C
Figure 3-1. Audio Control Panel
3-3
