Air Comm Systems ACS 775SL-100 User manual

Air Comm Systems, Inc
37610 Sky Canyon Dr., Hangar 51
Murrieta, CA 92563
Ph: 951-677-0101 ~ Fx: 951-677-0701
[email protected] ~ www.AirCommSystems.com
Single Audio Mixer Panel
Installation and Operations Manual
ACS 775SL-100 Revision 3.0

ACS 775SL-100 Operations and Installation Manual
2 | Page
Table of Contents
Installation................................................................................................................................................................3
Physical Specifications.................................................................................................................................... 3
Operating Specifications:................................................................................................................................ 3
Physical Dimension Outline for Mounting...................................................................................................... 4
Physical Installation ........................................................................................................................................ 4
Interface Schematic........................................................................................................................................ 5
Operation..................................................................................................................................................................6
Front Panels Controls ..................................................................................................................................... 6
Figure 1 - Front Panel Controls....................................................................................................................... 7
Figure 2 - Rear Panel Controls ........................................................................................................................ 7
Warranty Information.............................................................................................................................................8
Limited Warranty Information........................................................................................................................ 8

ACS 775SL-100 Operations and Installation Manual
3 | Page
Physical and Operating Specifications
Installation
Physical Specifications
Size:
5.75 in. (14.61cm) Width
Weight:
1.25lb. (.56kg)
1.50 in.( 3.81 cm) Height
6.78 in.(17.22cm) Depth
Mounting:
Dzus rail mount
Controls:
Panel Mounted - Transmit = Rotary Switch
Audio Inputs = Toggle Switch
Volume Control = Dual Potentiometer
Illumination:
Edge lit front panel per MIL-P-7738E, type 3. Capable of connection to dimmer bus for
adjustment. Amber transmit light indicates when unit is in transmit mode.
Operating Specifications:
Inputs: 4 Selectable receive audio inputs and 5 transmit selections
Duty Cycle: Continuous
Power Requirements: 14V DC+/- 10%
Maximum Operating Altitude: 16,500 FT.(5029 M)
Operating Temperature Range: -40 c to +85 c (OPERATING), -65 C to +125 C (storage)
Current Drain: 70 ma at 14V (standby) - 500ma at 14V (max. Signal)
Audio output: Minimum 250 mw into 600 ohms
Frequency response: Within 6 db - 300-3000Hz
ICS Input Impedance: 600 ohms
Receiver Input Impedance: 600 ohms - matched to receiver INPUT
Isolation: Not less than 50 db between inputs
Audio Muting: Not less than 40 db during transmit/ICS (optional)
Mic Sensitivity: 300 mv for rated output
Distortion: Less than 10% at 1000 Hz for maximum output

ACS 775SL-100 Operations and Installation Manual
4 | Page
Physical Dimensions
Physical Dimension Outline for Mounting
**UNIT WIDTH BEHIND FACE PLATE**
4.950”
1.500”
5.750”
**FRONT PANEL WIDTH – STANDARD DZUS MOUNT**
5.031”
Physical Installation
The ACS 775SL-100 is designed to be Dzus mounted and should be installed in the aircraft using the
DC37SL-F Installation kit that is included. The above outline drawing of the unit with dimensions will
facilitate the installation. Be sure that adequate clearance is allowed for the rear connector and cable
harness.
The connector pin configuration of the ACS 775SL-100 rear connector and the recommended wire size
for the aircraft cable harness isshown on the following page.

ACS 775SL-100 Operations and Installation Manual
5 | Page
Interface Schematic
Interface Schematic
Connector Pin-out
The ACS 775SL-100 wiring harness should be constructed of Tefzel aircraft wire (M22759/16 grade).
Power and ground wires should be 18 or 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. Important -
please note the power of the unit before installing; it will be 14VDC and clearly marked as such on the
unit’s data tag.
Pre-fabricated cable harnesses are available from Air Comm to expedite installations. Consult our sales
department for details.

ACS 775SL-100 Operations and Installation Manual
6 | Page
Front Panel Controls
Operation
Front Panel s Cont rols
Description
The ACS 775SL-100 Single Audio Mixer Panel is a compact, lightweight unit which provides full audio
control for a single position in the aircraft. It has the capability to provide its user with 4 receive audio
selections, 5 transmitter selections, and full headphone audio and ICS volume control.
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 channeled 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 sent to the headphone.
3 - Headphone Volume Controls
Clockwise rotation increases the volume - counter clockwise rotation decreases the headphone 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. (see FIGURE 2)
4 - Lighting
The audio panel is lit by two 14V (P/N 330) lamps which provide night time visibility for all panel legends.
These lamps may be replaced in the event of a failure by unscrewing the front panel mounted filter cap,
inserting a new lamp, and reinserting the filter into the front panel.
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 showing that the audio panel is in the transmit
mode.
See Figure 1

ACS 775SL-100 Operations and Installation Manual
7 | Page
Front Panel Controls Cont.
7- VOX (Voice Activated Intercom) Control
VOX technology ensures clean, crisp intercom regardless of cockpit noise conditions and results in better
communications and reduced pilot noise fatigue. The intercom can be set to the “off” position when not
desired.
Figure 1 -Front Panel Controls
6
2
4
5
1
7
3
Figure 2 - Rear Panel Controls
See Figure 1

ACS 775SL-100 Operations and Installation Manual
8 | Page
Warranty Information
Limited 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.
37610 Sky Canyon Dr., Hangar 51 Murrieta, CA 92563
Ph: 951-677-0101
Fx: 951-677-0701
[email protected]
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.