Air Comm Systems ACS 300A-101 Manual de instalación y funcionamiento - Página 7
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ACS 300A-101 Installation and Operations
Manual Front Panel Controls
( See Figure 1 — Page 8 for pictorial )
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5 - Mic Selector
This rotary switch performs three functions simultaneously. It (a) connects the mic to the selected
transmitter (b) selects the associated keyline, and (c) selects the associated audio (if not already
selected using the audio select-mute switch). The audio selected also allows for cross sidetone if the
other mic select switch has selected the same transmitter.
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6 - Transmit Indicator
When the transmit key is activated this NVG indicator lights up show that the audio panel is in the
transmit mode.
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7 - ICS Switch
This switch selects the ICS mode. In the "up" position (ICS) each side of the audio panel is connected
to the common ICS bus. This enables each side to communicate with the other side when their
respective ICS PTT switches are keyed.
In the "center" position (OFF), the ICS bus is disconnected and both sides are isolated.
The ICS switch also provides for "Hands Free" operation. In the "down" position (HOT ICS) , both
headphone mics are active and signals are fed into the ICS bus without having to key the respective
ICS PTT switches.
8 - VOX POT
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The high-power VOX is controlled by this knob. In order to use the VOX feature, the ICS ON/OFF/PVT
toggle switch must either be in the "ON" or "PVT" position. If the toggle switch is in the "OFF" position, the
Audio Mixer Panel is isolated from the ICS buss, and no ICS communication is possible. Once the ICS
switch is in the "ON" or "PVT" position, the VOX can be activated by turning the knob clockwise past the
On/Off detent and threshold set to activate with voice.
The moment you begin talking the VOX circuitry activates and relays your voice transmission. When you
stop speaking the VOX circuit turns off to reduce unwanted background noise. Turning the knob clockwise
adjusts the threshold. If the knob is turned fully clockwise the VOX circuit will always be active and you will
hear background noise. If the knob is adjusted just past the On/Off detent then the VOX circuit cannot be
activated and you will revert to normal keyed ICS. Adjust the threshold level to match the ambient noise
conditions of the aircraft at the time for proper operation.
While in the VOX mode, if you wish to quickly isolate yourself from the ICS buss, you simply put the ICS
ON/OFF/PVT toggle switch in the "OFF" position.
Air Comm Systems, Inc.
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