Air Comm Systems, Inc.
Single Audio Mixer Panel
Installation and Operations Manual
ACS 775
AirComm
Air Comm Systems Inc.
1640 W. Acoma Blvd., Suite A-118
Lake Havasu City, AZ 86403
Phone (928) 854-5402
Airborne Audio Products FAX (928) 854-8919
E-Mail aircomminc@aol.com
ACS 775 Installation and Operations Manual
Table of Contents
n Installation
Physical Specifications and Product Features Page 3
Physical Dimensions Page 4
Interface Schematic Page 5
n Operation
Front Panel Controls Page 6-7
n Warranty Information
Warranty Information Page 8
n Supplemental Information
Product Schematics
________
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ACS 775 Installation and Operations Manual
Physical and Operating Specifications
n Physical Specifications
· 250 mW power output
· 500mA @28VDC
· Lightweight - 2.00 lb (.90 kg)
· Lighting - MIL-P-7788 Type 3/5
· Dimensions - refer to outline
n Product Features
· PTT and HOT ICS modes
· Integrated ICS and TX PTT Switches
· 6 Transmit positions plus PA
· 8 Receive Audio selections plus 1 non-selectable input
· ICS Bus/RX audio for passenger expansion
· Emergency mode operation
· Internal interface for non-aircraft radios
· 14 or 28VDC operation
· Custom panel legends
· Color coded knobs and toggle switches
· Connector installation kit (crimp) included
· 1-Year Full Warranty
· Approved for use on USFS contracts
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ACS 775 Installation and Operations Manual
Physical Dimensions
n Physical Dimension Outline for mounting
Physical Installation
The ACS 775 is designed to be Dzus mounted and should be installed in the aircraft using the Installation
kit that is included. The above outline drawing of the unit with dimensions will facilitate the installation.
The connector pin configuration of the ACS 775 rear connector and the recommended wire size for the
aircraft cable harness is shown on the following page. Be sure that adequate clearance is allowed for the
rear connector and cable harness.
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ACS 775 Installation and Operations Manual
Interface Schematic
n Connector Pin-out
The ACS 775 wiring harness should be constructed of Tefzel aircraft wire (M22759/16 grade). Power and
ground wires should be 20 AWG, and all other wires may be 22 AWG. Shielded wires should be used where
noted. Adequate protection against wear and chafing should be taken by using a braided cable sleeving or
jacket. Before completing installation, verify that all cable connector pins are seated properly and that the
connector is securely mounted to the unit mating connector.
Pre-fabricated cable harnesses are available from Air Comm to expedite installation consult our sales
department for details.
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ACS 775 Installation and Operations Manual
Front Panel Controls
1- NORM - EMER SWITCH
This switch controls the operation of the audio panel in the event of an audio amplifier
failure. In the up position (NORM) the audio panel is in normal operating mode. In the
down position (EMER) all audios are summed and then fed directly to the
headphones. This enables the use of the transmitters and other equipment during audio
amplifier failure.
2 - RECEIVE AUDIO SELECT-MUTE SWITCHES
Normal operation - In the up position the audio selected is channelled to its proper
headphone. In the down position the audio selected is muted.
Emergency operation - In the up position the audio selected is muted. In the"down"
position the audio selected is summed with any other audios selected and then sen t to
the headphone.
3 - VOLUME CONTROLS
These concentric knobs adjust headphone volume. The larger one adjusts the radio
volume while the smaller one adjusts the intercom volume. Clockwise rotation increases
the volume - counter clockwise rotation decreases the volume. In the event of excessive
or inadequate receiver volume the pots located on the rear of the unit may be adjusted
for the proper level.
4 - LIGHTING
The audio panel is lit by two 28V lamps which provide night time visibility for all panel
legends.
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ACS 775 Installation and Operations Manual
Front Panel Controls (contd)
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).
6 - TRANSMIT INDICATOR
When the transmit key is activated this indicator lights up show that the audio panel is in
the transmit mode.
7 - ICS SWITCH
This switch selects the ICS mode. In the up position the audio panel is connected to
the common ICS buss. This enables the audio panel to communicate with any other
audio panels also connected to the common ICS buss. In the center position ( OFF )
the audio panel is disconnected from all other panels.
In the down position ( HOT ICS ) the headphone mic becomes active and its signal is
fed into the ICS buss without having to depress the ICS key switch. This provides for
hands-off ICS operation.
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ACS 775 Installation and Operations Manual
Warranty Information
n Warranty Information
Air Comm Systems, Inc. warrants each new product to be free from defective material and workmanship and
agrees to remedy any defect or to furnish a new part in exchange for any defective unit provided an
examination discloses such defect occurred under normal use and service, and provided the defective unit is
delivered to us, with transportation charges prepaid, within 1 year from the date of acceptance of equipment
by the owner. Each unit required and claimed defective must be returned to:
Air Comm Systems, Inc.
1640 W. Acoma Blvd., Suite A-118
Lake Havasu City, AZ 86403
Attn: Service Dept.
Phone (928) 854-5402
FAX (928) 854-8919
EMail aircomminc@aol.com
This warranty does not extend to any products which have been subjected to misuse, neglect, accident, or in
violation of instructions furnished, nor does it extend to units which have been repaired or altered outside of
our factory except where such repairs are specifically authorized in writing by us.
This warranty is in lieu of all other warranties expressed or implied, and no representative or person is
authorized to assume for us any other liability in connection with the sale of our products.
Air Comm Systems, Inc. Page 8
