A710 & A711
ACCESS/A AUDIO CONTROL SYSTEM
Installation & Operating Instructions
TiL Document No. 96RE189
Rev. N/C
Issue 6
DECEMBER 1997
Technisonic Industries Limited
240 Traders Boulevard, Mississauga, Ontario L4Z 1W7
Tel: (905) 890-2113 Fax: (905) 890-5338
www.til.ca
Copyright by Technisonic Industries Limited. All rights reserved.
TECHNISONIC INDUSTRIES LIMITED
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A710/A711 Installation & Operating Instructions
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REVISION HISTORY
[ 96RE189 ]
DATE
EDITED
BY
Dec. 1997
WS
May. 04, 1998
WS
Added clarification for installation kit parts.
Jul. 08, 2009
WS
Oct. 20, 2015
AL
v
vi
Changed Format for Section Headers.
Changed Issue Format *
Page Numbers are now sequential.
Corrected Spelling & Grammar throughout
document.
Date on Front Page changed back to original
release. Only Revisions require a date change.
Added Sections 1.6.1-1.6.7 to Table of Contents.
Added unlabelled Figures & Tables to the List.
N/C – 5
35
49
Corrections to Post-Installation Adjustments.
Added Warranty Page.
Jun. 03, 2016
AL
N/C – 6
v
All
Corrections to Table of Contents
Added Tone Alerting Section
Jul. 12, 2016
JW / AL
REV
PAGE
N/C – 1
2
2
N/C – 2
5&6
N/C – 3
25
N/C – 4
All
All
All
All
i
DESCRIPTION
Modified specifications according to TSO tests.
Update to comply with results of TSO tests.
Modified specifications according to results of tests
for increased Temperature Range and Altitude.
* Rev. N/C Issues 1, 2, and 3 were formerly 2.0, 2.1, and 2.2. To match Technisonic’s current Revision /
Issue update format, the names have been changed accordingly.
A710/A711 Installation & Operating Instructions
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NOTES
CAUTION STATIC SENSITIVE !
This unit contains static sensitive devices. Wear a grounded wrist strap and work at a static-safe
workstation when handling internal printed circuit boards.
WARNING
Changes or modifications not expressly approved by Technisonic Industries could void the user’s
authority to operate the equipment.
WARRANTY INFORMATION
The Model A710 & A711 Audio Controllers are under warranty for one year from date of purchase.
Failed units caused by defective parts or workmanship should be returned to:
Technisonic Industries Limited
240 Traders Boulevard
Mississauga, Ontario L4Z 1W7
Tel: (905) 890-2113
Fax: (905) 890-5338
TRADEMARK INFORMATION
ACCESS/A, ACCESS/D, ACCESS/R & ACCESS/F are all trademarks of Technisonic Industries Ltd. and
Sphere Research Corporation. All rights reserved.
A710/A711 Installation & Operating Instructions
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TABLE OF CONTENTS
SECTION
TITLE
PAGE
1
1.1
1.2
1.3
1.4
1.5
1.6
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.6
1.6.7
GENERAL DESCRIPTION B
INTRODUCTION ............................................................................................................
DESCRIPTION ...............................................................................................................
PURPOSE OF EQUIPMENT .........................................................................................
MODEL VARIATIONS ....................................................................................................
TECHNICAL SUMMARY ................................................................................................
SYSTEM LIMITATIONS .................................................................................................
POWER LIMITATIONS ..................................................................................................
FREQUENCY RESPONSE LIMITATIONS ....................................................................
CROSSTALK LIMITATIONS ..........................................................................................
ISOLATION LIMITATIONS .............................................................................................
STANDARD SETTINGS UTILIZED THROUGHOUT TESTING ....................................
TRANSMISSION PRIORITY ..........................................................................................
INDUCED SIGNAL SUSCEPTIBILITY, RF SUSCEPTIBILITY, AND RF EMISSION ...
1
1
2
2
5
7
7
7
7
7
8
8
8
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
2.13
2.14
2.15
INSTALLATION INSTRUCTIONS B
GENERAL ......................................................................................................................
EQUIPMENT PACKING LOG ........................................................................................
WIRING REQUIREMENTS ............................................................................................
AUDIO PANEL INSTALLATION & DRAWINGS ............................................................
INSTALLATION KIT - CONTENTS ................................................................................
PIN CONNECTIONS AND LOCATIONS .......................................................................
HEADPHONE INSTALLATION ......................................................................................
MICROPHONE INSTALLATION ....................................................................................
PTT CONNECTIONS .....................................................................................................
MAIN POWER +28 VDC ..................................................................................................
BACKLIGHTING POWER +28 VDC / +5 VDC ...................................................................
GROUND .......................................................................................................................
STORAGE ......................................................................................................................
POST-INSTALLATION ADJUSTMENT LOCATIONS ...................................................
POST-INSTALLATION ADJUSTMENTS .......................................................................
9
9
9
10
25
26
31
31
31
31
31
32
32
33
34
3
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
OPERATING INSTRUCTIONS B
FRONT PANEL OPERATOR’S SWITCHES AND CONTROLS ....................................
INTERCOM KEYING MODE AND SENSITIVITY CONTROL .......................................
ICS OR INTERCOM VOLUME CONTROL ....................................................................
RX OR RECEIVE VOLUME CONTROL ........................................................................
RX OR RECEIVE SELECTORS ....................................................................................
TX OR TRANSCEIVER SELECTORS ...........................................................................
EMERGENCY SWITCH OPERATION & STATUS LEDs ..............................................
A711 RX MONITOR LEVEL CONTROLS ......................................................................
SPECIAL SIGNAL CONSIDERATIONS ........................................................................
DIRECT AUDIO CONNECTIONS ..................................................................................
SUM NODE ....................................................................................................................
VOICE ALERTING (Applicable to –3, –4, –7, and –8 Variants Only) ............................
VOICE STORAGE FUNCTION (Applicable to to –3, –4, –7, and –8 Variants Only) ......
TONE ALERTING (Applicable to –13, –14, –17, and –18 Variants Only) .....................
SPEAKER AUDIO ..........................................................................................................
CHANGING OVERLAY LIGHTING & RADIO LEGENDS ..............................................
39
40
41
41
42
42
43
44
45
45
45
45
47
47
47
48
WARRANTY .................................................................................................................... 49
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LIST OF FIGURES
FIGURE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
TITLE
PAGE
A710 ACCESS/A Audio Controller – General View ......................................................
A711 ACCESS/A Audio Controller – General View ......................................................
Outline Drawing for Model A710 ACCESS/A Audio Controller ......................................
Outline Drawing for Model A711 ACCESS/A Audio Controller ......................................
System Installation Drawings – Pilot/Co-Pilot Wiring .....................................................
System Installation Drawings – COM1 - COM4 Wiring ..................................................
System Installation Drawings – COM5 - NAV1 Wiring ...................................................
System Installation Drawings – NAV2 - NAV5 Wiring ....................................................
System Installation Drawings – NAV6 - NAV8 / Tape Wiring ........................................
System Installation Drawings – Passenger Wiring ........................................................
System Installation Drawings – Alternate Passenger Wiring .........................................
System Installation Drawings – Power & Alerting Wiring (Voice Alerting Option) .........
System Installation Drawings – Alerting Wiring (Tone Alerting Option) .........................
System Installation Drawings – Direct Input / Special Function Wiring .........................
System Installation Drawings – Reserved Wiring ..........................................................
System Installation Drawings – Special 6-Place Passenger Wiring ..............................
A710 Adjustment Locations ...........................................................................................
A711 Adjustment Locations ...........................................................................................
Back – Alerting Adjustments ..........................................................................................
Front Panel Operator’s Switches and Controls ..............................................................
ICS / Intercom Controls ..................................................................................................
Level / Volume Controls .................................................................................................
RX & TX Selectors .........................................................................................................
Status LEDs & Emergency Switch .................................................................................
A711 RX Monitor Level Controls ....................................................................................
Overlay & Legend Insert .................................................................................................
Removing the Overlay Assembly ...................................................................................
3
4
11
12
13
14
15
16
17
18
19
20
21
22
23
24
32
33
36
39
40
41
42
43
44
48
48
LIST OF TABLES
TABLE
1
2
3
4
5
6
7
TITLE
PAGE
A710 General Specifications .......................................................................................... 5
A711 General Specifications .......................................................................................... 6
J101 Bottom Connector Pin Assignments ...................................................................... 26
J201 Top Connector Pin Assignments ........................................................................... 27
J202 Top Connector Pin Assignments ........................................................................... 28
J102 Bottom Connector Pin Assignments (For –3, –4, –7, and –8 Variants) ................ 29
J102 Bottom Connector Pin Assignments (For –13, –14, –17, and –18 Variants) ........ 30
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SECTION 1: GENERAL DESCRIPTION
1.1
INTRODUCTION
This publication provides operating and installation information on the Model A710 and A711,
ACCESS/A Audio Control series manufactured by Technisonic Industries Limited. This unit is
designed to provide high performance cockpit audio control in high noise installations. The unit is
plug and pin compatible with the ACCESS/A family format, to allow fleet wide compatibility with all
ACCESS/A installations. The A710 unit may be directly interchanged with an A711 in the same
harness, but the units are physically different in size, and the A711 has individual volume controls
for the transceiver inputs. Use of either of these boxes in an existing full stereo headset
installation, such as with an A720 or A721, would require the use of a headset output plug
adapter cable, although all other connections would be directly interchangeable.
1.2
DESCRIPTION
This high power audio controller delivers at least 332 mW of audio into 150 ohms at less than 2%
total distortion to the pilot and co-pilot positions simultaneously. It can deliver lower output powers
into 300 and 600 ohm headsets. The pilot’s position may also be internally strapped to interface
with 8-20 ohm headsets at the same power level. Push-button transmit selector switches allow
immediate selection of any of the seven supported aircraft communications transceivers or PA
amplifiers, while additional push-button audio input selector switches allow selection of any or all
of the supported transceivers and Nav aids. ACCESS/A systems have auto-RX switching, when a
transmitter is selected, to reduce pilot workload and avoid operational problems.
Both the A711 and A710 have front panel selectable and adjustable VOX, LIVE, or KEYED
intercom (ICS) functions. An EMERGENCY mode push-button switch (switch and LED turn redorange when activated) provides "straight through" or “fail-passive” transmit and receive audio for
the pilot on the selected communications channel. This switch also provides an implicit pilot
ISOLATION function, and allows the pilot to isolate himself from the co-pilot (and the ICS system),
so that he may access different communications from the other users supported by this panel (in
essence, an emergency link to the selected transceiver only). In the NORMAL position (switch
turns black & LED green), the pilot's audio is provided as selected by all of the panel controls, and
is part of the ICS system. Separate RX and ICS volume controls are provided on the panel along
with an ICS VOX threshold control. These units can also provide ICS support and boom mic TX
support for a complete aircraft crew, including the pilot, co-pilot, and up to 4-6 additional
passengers.
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1.3
PURPOSE OF THE EQUIPMENT
The A710 and A711 ACCESS/A Audio Controls are designed to provide centralized audio
management and control within an airborne communications environment. This includes radio
and transceiver selection, intercom, airframe threat alerting, and crew management. These units
have been packaged to minimize size and weight characteristics and are ideally suited for
helicopter installations or any other Dzus rail panel location. Both the A710 and A711 meet all of
the current requirements of US Forest Service "contractor furnished avionics" and can be used in
a dual control installation in conjunction with a TiL FM airborne transceiver to comply with all US
Forest Service Contract Requirements. These products are also compliant with TSO-C50c. The
units were tested according to RTCA/DO-214 and RTCA/DO-160C applicable categories with the
exception of the RF Susceptibility Test, which is based upon the requirements of RTCA/DO160A, and the Lightning Induced Transient Susceptibility Test which is not called out under
RTCA/DO-170.
1.4
MODEL VARIATION
The A710 and A711 come in two basic lighting configurations: a +28 VDC panel lighting version
and a +5 VDC panel lighting version. Operationally, the two are identical. The color of the solidstate backlighting is green-yellow, at approximately the 565 nm wavelength. Front panel color
may be either Cessna Cadet gray or matte black. The default configuration is gray, with 28 VDC
backlighting. Units may also be supplied with or without internal voice alerting modules or
alternatively the tone alerting module. See the ACCESS/A price list for model numbers and
availability or different versions. The most common variations are summarized below:
A710 = 961068 - (dash number)
A711 = 961072 - (dash number)
Dash Numbers:
-1
-2
-3
-4
-13
-14
Gray Panel
Black Panel
Gray Panel
Black Panel
Gray Panel
Black Panel
28 VDC Lighting
28 VDC Lighting
28 VDC Lighting, includes A851 Voice Alerting (Obsolete)
28 VDC Lighting, includes A851 Voice Alerting (Obsolete)
28 VDC Lighting, includes Tone Alerting
28 VDC Lighting, includes Tone Alerting
Special Order:
-5
-6
-7
-8
-17
-18
Gray Panel
Black Panel
Gray Panel
Black Panel
Gray Panel
Black Panel
5 VDC Lighting
5 VDC Lighting
5 VDC Lighting, includes A851 Voice Alerting (Obsolete)
5 VDC Lighting, includes A851 Voice Alerting (Obsolete)
5 VDC Lighting, includes Tone Alerting
5 VDC Lighting, includes Tone Alerting
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NOTE: Shows new case design (relocated Dzus fasteners) effective mid-1997. Previous release
case is identical except for this change (edge Dzus fasteners).
FIGURE 1: A710 ACCESS/A Audio Controller – General View
A710/A711 Installation & Operating Instructions
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FIGURE 2: A711 ACCESS/A Audio Controller – General View
A710/A711 Installation & Operating Instructions
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1.5
TECHNICAL SUMMARY
A summary of the relevant electrical, operational, mechanical and physical characteristics of the
control panels are given in Table 1 and 2, General Specifications.
MODEL A710 - ACCESS/A Audio Controller:
PHYSICAL CHARACTERISTICS:
Width (max.) .................................................................................................................................................... 5.75 inches
Height (max.) ................................................................................................................................................. 1.875 inches
Depth................................................................................................................................................................. 6.07 inches
Weight (including alerting) ..................................................................................................................... 2.4 lbs. (1.09 Kg)
Mounting ............................................................................................................................... Standard Dzus, 4 fasteners
POWER SOURCE REQUIREMENTS:
DC Voltage (MIN, TYPICAL, MAX) .................................................................................................. 20.0 V, 28 V, 32.2 V
(System performance will be degraded at upper and lower limits)
DC Current ..................................................................................................... 1 A (6 users @ 150 Ω, + speaker @ 8 Ω)
Backlighting Input:
Standard ................................................................................................................................................. 28 VDC @ 50 mA
Optional ................................................................................................................................................... 5 VDC @ 270 mA
TECHNICAL CHARACTERISTICS:
Input Impedance (Normal Mode, any RX input) .............................................................. 1.55 k Ω (typical)
Input Impedance (Emergency Mode, Com1-7 RX Inputs) ................................ 50 Ω + Headset Z (typical)
Headset Channel Output Impedance ................................................... 8 or 80 Ω (depending on settings)
H/S Audio Power Output ...................................................................... At least 332 mW (primary user) into 150 Ω
with 6 headsets (150 Ω each) connected.
H/S Audio Power Output ......................................................................................... At least 500 mW (pilot) into 8-20 Ω
H/S Audio Power Output ...................................................................... At least 1500 mW (total) into 6 users @ 150 Ω
Speaker Power Output ................................................................................................................. At least 2.5 W into 8 Ω
Audio Distortion (Speaker or H/S) .................................................... Less than 2% THD @ 1 kHz at total rated output
Audio Frequency Response (ICS)......................................................................... Within 3 dB from 300 Hz to 6000 Hz
Audio Frequency Response (Rx & NAV) ............................................................. Within 3 dB from 300 Hz to 3000 Hz
Hum and Noise Level ............................................................................................... Better than -60 dB below 500 mW
Input Muting (when mike is keyed) .................................................................................................................. Adjustable
Input to Input Isolation ............................................................................................... Better than -70 dB between inputs
Deselected Input Isolation .................................................................................................................... better than -65 dB
ENVIRONMENTAL:
Temperature (operating) ................................................................................................................ -45°C to +70° Celsius
Temperature (survival non-operating) .......................................................................................... -55°C to +85° Celsius
Humidity ........................................................................................................................................... 95% Non-condensing
Shock .......................................................................................................................................................... 12 g (any axis)
Altitude .............................................................................................................................................................. 25,000 feet
TABLE 1: A710 General Specifications
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MODEL A711 - ACCESS/A Audio Controller:
PHYSICAL CHARACTERISTICS:
Width (max.) ........................................................................................................................ 5.75 inches
Height (max.) .................................................................................................................... 2.625 inches
Depth ................................................................................................................................... 6.07 inches
Weight (including alerting) ......................................................................................... 3.0 lbs. (1.36 Kg)
Mounting .................................................................................................... Standard Dzus, 4 fasteners
POWER SOURCE REQUIREMENTS:
DC Voltage (MIN, TYPICAL, MAX) .......................................................................... 20.0V, 28 V, 32.2V
(System performance will be degraded at upper and lower limits)
DC Current ............................................................................ 1 A (6 users @150 Ω, + speaker @8 Ω)
Backlighting Input:
Standard.................................................................................................................... 28 VDC @ 70 mA
Optional ..................................................................................................................... 5 VDC @ 370 mA
TECHNICAL CHARACTERISTICS:
Input Impedance (Normal Mode, any RX input) ................................................... 2K-1.5K Ω (approx.)
Input Impedance (Emergency Mode, Com1-7 RX Inputs) .......................... 50 Ω + Headset Z (typical)
Headset Channel Output Impedance ............................................. 8 or 80 Ω (depending on settings)
H/S Audio Power Output ................................................... At least 332 mW (primary user) into 150 Ω
with 6 headsets (150 Ω each) connected.
H/S Audio Power Output ............................................................... At least 500 mW (pilot) into 8-20 Ω
H/S Audio Power Output ............................................. At least 1500 mW (total) into 6 users @ 150 Ω
Speaker Power Output ...................................................................................... At least 2.5 W into 8 Ω
Audio Distortion (Speaker or H/S) .......................... Less than 2% THD @ 1 kHz at total rated output
Audio Frequency Response (ICS) .............................................. Within 3 dB from 300 Hz to 6000 Hz
Audio Frequency Response (Rx & NAV) .................................... Within 3 dB from 300 Hz to 3000 Hz
Hum and Noise Level ...................................................................... Better than -60 dB below 500 mW
Input Muting (when mike is keyed) ...................................................................................... Adjustable
Input to Input Isolation .................................................................... Better than -70 dB between inputs
Deselected Input Isolation ........................................................................................ Better than -65 dB
ENVIRONMENTAL:
Temperature (operating) .................................................................................... -45°C to +70° Celsius
Temperature (survival non-operating) ............................................................... -55°C to +85° Celsius
Humidity ............................................................................................................. 95% Non-condensing
Shock ............................................................................................................................ 12 g (any axis)
Altitude ................................................................................................................................ 25,000 feet
TABLE 2: A711 General Specifications
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1.6
SYSTEM LIMITATIONS
A summary of the relevant system limitations is given below.
1.6.1
POWER LIMITATIONS
With Standard Set-up, which consists of six headsets connected, a power output of not less than
332 mW is delivered per headset (as represented by 150 ohms) provided that the Direct Alert
Input is terminated in not less than 600 ohms and that nominal input voltages are applied at the
applicable channel inputs. Nominal microphone input: 100 mVrms; Nominal
Communications/Navigational Input: 5.5 Vrms.
1.6.2
FREQUENCY RESPONSE LIMITATIONS
In accordance with the provisions made in RTCA/DO-214 Sections 2.8.1 and 1.5.1, the
communications transmit out and receiver channels (communications and navigational) possess
an effective bandwidth of 300 Hz-3000 Hz with a maximum amplitude variation of 3 dB within the
frequency range.
1.6.3
CROSSTALK LIMITATIONS
To ensure that the crosstalk specifications are in accordance with the applicable sections of DO214, it is essential that:
1) Manufacturer’s maximum microphone input voltage of -4.7 dBu not be exceeded in order
to avoid jeopardising input to microphone output crosstalk results, particularly at the low
frequency end
2) in the instance where only two access units are daisy chained via their ICS tie-lines, a
resistor of not greater than 600 ohms must be maintained across the ICS tie-line in order
to avoid jeopardising station to station crosstalk results in Rx mode at the high frequency
end.
The phenomenon of music appearing at the headset of the Second Station Panel (SSP or unit at
which the crosstalk is measured) for station to station crosstalk considerations is a limitation of
the A710/711 and for which crosstalk at high frequencies (6000 Hz and greater) can fall below 65
dB of attenuation. However music for most intents and purposes may be considered an optional
feature, which may be turned off without a negative impact on the essential functioning of the
access units.
Further, valid station to station crosstalk measurements were quoted in respect of a half power
level at the headset at the First Station Panel (FSP or unit from which the crosstalk originates) as
opposed to a half power level at the speaker output of the FSP because it is envisioned in the
latter scenario that the substantial speaker level (which will also necessitate very large signal
levels at the FSP headset) will have an impact on the listener at the SSP whether a crosstalk
signal appears at the SSP listener’s headset or not.
1.6.4
ISOLATION LIMITATIONS
When in Pilot Isolation Mode, the pilot microphone for ICS operation is rendered inactive.
Consequently, neither co-pilot nor passengers can receive pilot intercom transmissions while the
latter is in Isolation mode.
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1.6.5
STANDARD SETTINGS UTILIZED THROUGHOUT TESTING
Pilot Headset Settings utilised throughout testing were for the standard 150 ohms impedance
headset.
The PAL options utilised were applicable to the following configuration: Where Pilot or Co-pilot
transmitted on the UUT ICS communication was possible only in the instance where the signal
emanated from other unit(s) daisy chained to the UUT via the ICS tie-line. In this event, the UUT
would receive the ICS transmissions from the other unit(s). It was not possible for the UUT, which
transmitted, to export ICS communication to another unit nor was it possible for intra ICS
communication to occur between users connected to UUT (i.e. Option 1 not implemented).
1.6.6
TRANSMISSION PRIORITY
Where Pilot and Co-pilot transmitted simultaneously, the Pilot transmissions took precedence
over those of the Co-pilot. Co-pilot transmissions in this case would be rendered inactive.
1.6.7
INDUCED SIGNAL SUSCEPTIBILITY, RF SUSCEPTIBILITY, AND RF EMISSION
The wiring connections called out in the Installation and Operating Instructions, Chapter 2,
describes shield terminations for minimum ground loop noise. The test harnesses used for
RTCA/DO-160 sections 19, 20, and 21 – Induced Signal Susceptibility, RF Susceptibility, and
Emission of RF Energy respectively - used shield terminations at both ends of the cable. Should
RF susceptibility pose a problem in a particular installation, the installer may wish to try
terminating shields at both ends of the cable. Further, if this does not produce satisfactory results,
then double shielding may be required.
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SECTION 2: INSTALLATION INSTRUCTIONS
2.1
GENERAL
This section contains information and instructions for the correct installation of the A710 and
A711, ACCESS/A Audio Controllers.
Make certain that the unit is correctly operating in accordance with the equipment user's
requirements and manufacturer’s specifications prior to releasing the equipment for service.
2.2
EQUIPMENT PACKING LOG
Unpack the equipment and check for any damage that may have occurred during transit. Save
the original shipping container for returns due to damage or warranty claims. Check that each
item on the packing slip has been shipped in the container. Verify that the equipment's
backlighting configuration is the same as that required.
2.3
WIRING REQUIREMENTS
Airframe wiring should be single conductor in accordance with MIL-W-22759 or multi-conductor in
accordance with MIL-C-27500 or Raychem 44 (81044) or 55 single or multi-conductor and
shielded wire. Heat shrink solder sleeves (such as Raychem or equivalent) should be utilized for
shield termination.
All Microphone audio input and output line connections should be made with 2 conductor/twisted
pair shielded cables as illustrated. Receiver audio input lines should also be 2 conductor twisted
pair shielded cables. The power and ground lines should be a minimum of #22 AWG (#20
preferred). Keying and all audio lines may be #24 AWG or larger.
CAUTION:
DO NOT bundle any low level audio lines with RF coaxial cables, 60 Hz or 400 Hz AC inverter,
motor, pump or blower wiring, which can cause noise coupling between the various systems,
especially during RF transmission or pump/blower mechanical operation. Maintain as much
distance as possible from these types of wire bundles.
Note that there is really no effective field-installable shielding for magnetic coupling (which occurs
at high currents), and the only suitable prevention for this type of interference is distance between
the interfering lines. Shielded wiring is effective only for electrostatic coupling or voltage driven
interference.
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2.4
ACCESS/A AUDIO PANEL INSTALLATION
The A710 and A711 ACCESS/A Audio Controls are designed to be Dzus mounted and should be
installed in conjunction with an IN-A710 installation connector kit. See Figure 3 for an outline
drawing of the units with dimensions, to facilitate the installation.
CABLE CLEARANCE:
Allow at least 2.5” of additional rear clearance for mating connectors and hoods (side
routing) or 3.0” (back routing). Cables should be long enough to permit the unit to be
removed from the panel, and the connectors to be easily disengaged. DO NOT dress or
strap the mating cables so that front removal is impossible, or the unit cannot be removed
for service or adjustment in the field.
ALERT OPERATION:
Voice alerting can be supplied with this unit from the factory (addition of an A850, A851,
or A852 module and resulting dash number change), or it can be added in the field. Field
installation must be done at a fully equipped service bench and requires a system
functional test & re-certification.
Alternatively, 3 Tone alerting can be supplied with this unit from the factory instead. Tone
frequency and cycle rate, as well as # 3 alert on-time, can be adjusted at the rear of the
unit. Field installation of the tone option must be done at a fully equipped service bench
and requires a system functional test & re-certification.
PANEL MODIFICATIONS:
Modified panel legends, panel lighting, NVG compatibility, or overlay colors are also
possible. Please see the price list for a full summary of options and part numbers.
Overlays and legends may be easily changed at low cost in the field with no special tools
or service facilities required.
SHIELD GROUNDS:
Convenient shield ground connections are provided at each connector for the indicated
input signal shield drains and will give the shortest possible return for these lines. These
shield lines may be daisy chained together, and a single wire from each cable brought
out to the connector pin.
INTERNAL OPTIONS:
All configurable and variable options of the A710 and A711 (pilot H/S impedance, muting
logic, included speaker audio lines, etc.) can be set or changed simply by altering internal
jumpers, but these changes require opening the unit for access to the required
connections.
DRAWINGS:
A full ACCESS/A (mono) system installation example is given in the multi-page sections
of Section 2.
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NOTE: Shows new case design (relocated Dzus fasteners) effective mid-1997.
Previous release case is identical except for this change (edge Dzus fasteners).
FIGURE 3: Outline Drawing for Model A710 ACCESS/A Audio Controller
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FIGURE 4: Outline Drawing for Model A711 ACCESS/A Audio Controller
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FIGURE 5: Pilot / Co-Pilot Wiring
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FIGURE 6: COM1-COM4 Wiring
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FIGURE 7: COM5-NAV1 Wiring
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FIGURE 8: NAV2-NAV5 Wiring
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FIGURE 9: NAV6-NAV8 / Tape Wiring
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FIGURE 10: Passenger Wiring
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FIGURE 11: Alternate Passenger Wiring
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FIGURE 12: Power & Alerting Wiring (Voice Alerting Option)
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FIGURE 13: Alerting Wiring (Tone Alerting Option)
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FIGURE 14: Direct Input Special Function Wiring
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FIGURE 15: Reserved Wiring
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FIGURE 16: Special 6-Place Passenger Wiring
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2.5
INSTALLATION KIT - CONTENTS
The IN-A710 installation kit (used for both A710 & A711 units) consists of:
The default Installation Kit Part Number is 969680-1.
For model variant –13, -14, -17 and –18 (Tone Alerting) use Installation Kit 969680-2.
1. One 50 pin female D-subminiature mating connector complete with crimp
pins, V-locks and hood. (DD50S)
P101
Positronics P/N SD50F00JVLX + 50 ea.
FC7520D contacts or equiv.
2. One 37 pin female D-subminiature mating connector complete with crimp
pins, V-locks and hood. (DC37S)
P201
Positronics P/N SD37F00JVLX + 37 ea.
FC7520D contacts or equiv.
3. One 15 pin female D-subminiature mating connector complete with crimp
pins, V-locks (-1) or jackscrews (-2) as required and hood. (DA15S)
P102
Positronics P/N SD15F00JVLX + 15 ea.
FC7520D contacts or equiv.
4. One 15 pin male D-subminiature mating connector complete with crimp
pins, V-locks and hood. (DA15P)
P202
Positronics P/N SD15M00JVLZ (or JVLX) + 15 ea.
MC7520D contacts or equiv.
NOTE: The mating connectors use a “one-hand”, tool-free Positronics V-lock assembly for ease of
airframe installation and removal.
To match approved installation agency standard practices, equivalent machined contact
D-subminiature connectors from vendors such as AMP/Tyco, Cannon, Cinch, or
Positronics, or those which are directly compatible with MIL-DTL-24308 may be
substituted for the Positronics contacts and inserts shown, but the Positronics V-latch
lock and hood must be retained in the final assembly for proper attachment to the
A710/711 unit. Any crimp contact used must be installed with the proper crimping die, set
to the correct wire size, and a pull test should be done on every wire after assembly.
Solder contact versions of the D-subminiature family from the above suppliers may also
be used, if every wire/contact junction is individually heat-shrink sleeved during assembly
to prevent inter-contact shorts within the hood.
In addition, the following items are packed with each A710 unit:
1.
This manual.
2.
Warranty registration card.
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2.6
INSTALLATION – PIN LOCATIONS AND CONNECTIONS
The pin numbers and locations for the connectors located on the rear of the A710/A711 ACCESS/A
Audio Control are shown in the following tables.
Bottom Connector J101 DD50P
COM
MIC
Mating Cable Connector: DD50S
(50 pin Female)
KEY
34
CONNECTION
NOTES
Power GROUND
Main Power Ground Line
35
18
PAX 1 Mic In
36
19
PAX 2 Mic In
37
20
PAX 3 Mic In
38
21
PAX 4 Mic In
39
22
2
PAX 5 Mic In
Lighting/Dimmer Common
(GND)
+5 VDC Dimmer Input
3
+28 VDC Dimmer Input
4
Supplemental Control Line
5
Reserved Control Line
Default = speaker volume.
CONNECTION
NOTES
1
Dimmer Lines
Dimmer Lines
Use only one
Dimmer Lines
Use only one
Default = PAX ICS PTT
COM
MIC
KEY
40
23
6
Pilot’s Mic In
41
24
7
Co-Pilot’s Mic In
42
25
8
Hand Mic In
Emergency Hand Mic
9
Pilot’s ICS Key
Active when grounded
26
C-Pilot’s ICS Key
Active when grounded
43
Shield ground for mic lines
44
27
10
COM 7/PA TX Mic Out
45
28
11
COM 6 TX Mic Out
46
29
12
COM 5 TX Mic Out
47
30
13
COM 4 TX Mic Out
48
31
14
COM 3 TX Mic Out
49
32
15
COM 2 TX Mic Out
50
33
16
COM 1 TX Mic Out
17
+28 VDC Power In
Main Power Input
Grounding PAX ICS PTT line (Pin 4) will make the passenger headsets LIVE, if use of a drop
cord is desired, that interrupts mic line to enable PAX ICS. Alternately, this line may be keyed by
the drop cord to enable ICS (or no drop cord can be used), and the front panel VOX control can
guide all ICS operation.
TABLE 3: J101 TX Bottom Connector Pin Assignments
View from solder side of MATING CABLE CONNECTOR DD50S:
1 .....................J...... 17
18 ................J.......... 33
34 ...........J............... 50
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Top Connector J201 DC37P
J201
Mating Cable Connector: DC37S
(37 Pin Female)
Connector Pin Assignments
RX Connector
LOW
HIGH
CONNECTION
NOTES
20
1
ICS Node
21
2
SUM Node Input
22
3
Direct Input
ICS Tie Line Between Units
For connection to A770
expansion units only
Unswitched Direct Input
Shield drain for input lines.
Switch #4: Pin 23 is common
Right-hand-most RX switch.
Switch #4: Pin 24 is common
Right-hand-most RX switch.
Switch #3
4
23
5
24
6
25
7
Shield ground
Music R Audio
(supports BRIDGE OUTPUT!)
Music L Audio
(supports BRIDGE OUTPUT!)
NAV 6 RX Audio
26
8
NAV 5 RX Audio
Switch #3
27
9
NAV 4 RX Audio
Switch #2
28
10
NAV 3 RX Audio
Switch #2
29
11
NAV 2 RX Audio
Switch #1
Left-hand-most RX
switch
Not Used If PA Enabled. Can also
be strapped “ON” internally.
Right-hand-most TX switch.
30
12
NAV 1 RX Audio
31
13
COM 7 RX Audio
32
14
COM 6 RX Audio
33
15
COM 5 RX Audio
34
16
COM 4 RX Audio
35
17
COM 3 RX Audio
36
18
COM 2 RX Audio
37
19
COM 1 RX Audio
Switch #1
Left-hand-most TX switch
Common Lines
Floating above airframe ground in ACCESS systems, but serves as common
signal low for corresponding input signal lines.
Common Lines
Floating above airframe ground in ACCESS systems, and not connected to
any other common line in the system.
TABLE 4: J201 Connector Pin Assignments
View from solder side of DC37S MATING CONNECTOR:
1 ................................... 19
20 .............JJ............. 37
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Top Connector J202 DA15S
J202
Mating Cable Connector: DA15P
(15 Pin Male)
Connector Pin Assignments
Headset Connector
LOW
HIGH
CONNECTION
NOTES
9
1
Pilot’s H/S Audio
Can be set internally to either
8/20 or 150/600
10
2
Direct Alert Connection
High level headset direct audio
(via pad)
11
3
Co-Pilot’s H/S Audio
Group A
4
PAX 1 H/S Audio
Group A
5
PAX 2 H/S Audio
Group B
12
PAX 3 H/S Audio
Group A
13
PAX 4 H/S Audio
Group B
6
PAX H/S Common
14
PAX H/S Common
15
7
Speaker Output
8 Ohms min.
8
Shield Ground
For connection to
external floating shields
PAX Headset lines from the same GROUP may be connected in parallel to give more drive for a
rear headset bus, but then must have isolation safety resistors installed (~47-51 ohms) in series
with the rear headsets for accidental short circuit isolation. See installation drawings for full
details.
Common Lines
Floating above airframe ground in ACCESS systems, but serves as common
signal low for corresponding output signal lines only.
Common Lines
At Ground potential, but line must be connected here only, not to airframe.
TABLE 5: J202 Connector Pin Assignments
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Bottom Connector J102 DA15P
(Voice Alerting Option)
Mating Cable Connector: DA15S
(15 Pin Female)
The following is only applicable to –3, –4, –7 and –8 variants:
J102
LOW
Connector Pin Assignments
Alerting Connector
HIGH
CONNECTION
NOTES
1
Play
Ground externally to activate last
message replay function.
2
Reset
3
CTS
These lines used only by the
remote computer programmer
4
Data
To create new alerting functions.
5
Audio In
Not connected in the airframe.
6
Audio Out
7
+28 VDC In
Alert Power (may come from
existing alert breaker)
Ground (Power)
Power ground return connection.
9
Record
Ground externally to activate
record function.
10
Alert 6 (in)
Active when grounded.
Accepts +28 VDC.
11
Alert 5 (in)
Active when grounded.
Accepts +28 VDC.
12
Alert 4 (in)
Active when grounded.
Accepts +28 VDC.
13
Alert 3 (in)
Active when grounded.
Accepts +28 VDC.
14
Alert 2 (in)
Active when grounded.
Accepts +28 VDC.
15
Alert 1 (in)
Active when grounded.
Accepts +28 VDC.
8
Programming Lines
Reserved for programming functions, do not use in the airframe.
TABLE 6: J102 Bottom Connector Pin Assignments (For –3, –4, –7, and –8 Variants)
Alerting may be either true voice, speech based alerting, or tone coded alerting, as specified by
the installed alerting module.
Alerting has separate power and ground connections, unrelated to the rest of the audio system.
Power may be taken from an existing alerting breaker, to retain the alerting defeat function by
pulling one common breaker. Power consumption is very low, typically under 25mA.
Programming for both tones and true voice alerting is done with a PC, and a special TiL
programming fixture. Contact TiL for full details.
View from solder side of DB15S MATING CONNECTOR:
1 ............................. 8
9 ........................... 15
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Bottom Connector J102 DA15P
(Tone Alerting Option)
Mating Cable Connector: DA15S
(15 Pin Female)
The following is only applicable to –13, –14, –17 and –18 variants:
J102
Connector Pin Assignments
Alerting Connector
CONNECTION
NOTES
2
Alert Audio Input (Internal Jumper
Selection)
PA Key Output (Active Low)
Alternate alerting input (disables
tone system if jumper selected)
To External PA system
11
PA Mic Out (Note: Rev. A)
To External PA System
LOW
HIGH
9
1
3
4
Siren Key 1 Output (Active Low)
Optional Function
5
PA LED Hi Input (Level Indicator)
Optional Function
Forces TX annunciators to day or
night level. If NOT used, this line
MUST be connected to J101, Pin 17
(28 VDC power input), or TX
annunciators will NOT light.
Alert Power (may come from
existing alert breaker)
6
Day/Night Annunciator Control
(12/24 VDC input)
IMPORTANT, see NOTES!
7
8
+28 VDC In
Ground (Power)
Power ground return connection.
10
PA Power Key Output (Active Low)
100mA ground output when PA
mode is selected, can be used to
activate a remote PA system.
12
Siren Key 2 Output (Active Low)
Alert 3 (in) Two-Tone, Timed (Rad
Alt DH)
13
14
Alert 2 (in) Pulsing Tone (Low Rotor)
15
Alert 1 (in) Steady Tone (Engine
Fail)
Optional Lines
Optional Function
Active when grounded.
Accepts +28 VDC.
Active when grounded.
Accepts +28 VDC.
Active when grounded.
Accepts +28 VDC.
Normally NOT enabled, installed as factory installed options only.
TABLE 7: J102 Bottom Connector Pin Assignments (For –13, –14, –17, and –18 Variants)
Alerting is tone based, with Alert 1 a steady tone, Alert 2 a pulsing tone, and Alert 3 a two-tone,
timed signal. All tones are adjustable at the rear apron, to better match existing horns in the
airframe. Alert 2 as priority over Alert 1, if both are activated at the same time. Alerting can be
optionally installed or deleted.
Alerting has separate power and ground connections, unrelated to the rest of the audio system.
Power may be taken from an existing alerting breaker, to retain the alerting defeat function by
pulling one common breaker. Power consumption is very low, typically under 50mA. Alert inputs
are optically coupled and may be routed to +28 VDC or ground without damage.
Previous revision has corrected the reversal of pins 3 & 11, shown correctly above.
Day/Night annunciator control forces the annunciators to appropriate levels (external 12/24 VDC).
It must be tied to +28 V if not used in this way or if auto-dimming via J101 is used.
View from solder side of DB15S MATING CONNECTOR:
1 ................................. 8
9 JJ........................ 15
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2.7
HEADPHONE INSTALLATION
The A710 & A711 ACCESS/A Audio Controls are intended for use with industry standard 150/600
ohm headphones. There is also provision for connection to an 8 ohm (minimum impedance)
speaker for a supplemental cabin speaker output. The pilot’s headset (only) may also be strapped
internally for a standard low impedance headset (8-20 ohms) at the same power level.
In all cases, the headset lines should be run as shielded, twisted pairs, to avoid contamination (and
resulting cross-talk) of companion low level mic lines or audio input lines. Failure to follow this wiring
guideline will result in unwanted cross-talk and phantom audio that will appear to be transmit or
intercom related.
The use of high quality headsets and “carbon-equivalent” boom microphones, such as David Clark
or Bose, is strongly recommended. Mixed headset impedances within the same ship will give
differing volume levels at the same A710/A711 control settings. The use of headsets with individual
volume controls is very useful to permit level adjustment suitable to each position, due to differing
headsets and the inevitable different hearing capability of individual users.
2.8
MICROPHONE INSTALLATION
All microphone connections to the A710 or A711 must be done with shielded cables. The inputs are
intended for use with standard “carbon-equivalent” or amplified dynamic Microphones (such as the
D/C M1, M4 M7, etc.). Shielded, twisted pair routing is strongly preferred for lowest noise pick-up,
but single conductor shielded wiring generally gives adequate results in non-critical or single box
installations, although noise floor and cross-talk will increase.
2.9
PTT CONNECTIONS
The Pilot, Co-pilot, and hand microphones require a PTT (Push To Talk) button or switch to key the
transceivers as required. If a Hand-held microphone is used, tie the PTT button to the appropriate
key line. If a boom microphone is incorporated into the headset, an external switch, such as the
cyclic switch or yoke switch, will be required to key the transmitter. PTT lines should go directly to
ground to activate the desired key function.
2.10
MAIN POWER +28 VDC
The main power +28 VDC (±20%) is connected to pin 17 of the 50 pin (lower) "D" connector.
As previously indicated, this connection should be made with at least #22 AWG wire, with #20
preferred. If from a very noisy source, with high levels of parasitic AC, shielding may improve
rejection of this coupled AC into other low level audio lines.
2.11
BACKLIGHTING POWER +28 VDC / + 5 VDC
The backlighting power for the front panel of the A710 and A711 is supplied via pins 1, 2 & 3 of the
50 pin (lower) "D" connector. Unless ordered and indicated otherwise on the rear of the ACCESS/A
A710, the unit is shipped with the +28 VDC backlighting option. Note that different pins are used for
5V and 28V lighting and there is a dedicated lighting ground pin, which MUST be connected for the
lighting to work. Lighting is isolated from other circuits in the system for noise reduction reasons.
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2.12
GROUND
The A710 Audio Control is designed for full Ground Isolation from the Airframe. This is necessary in
many cases where the Airframe Ground causes significant noise in the Audio system.
Main ground (power return) to the A710 and A711 is on pin 34 of the 50 pin "D" connector. All other
groups of audio lines have their own “common” lines, which float above the airframe ground, to
provide signal isolation. These common lines MUST be connected to the source audio or no signal
flow will result, except for stray leakage.
2.13
STORAGE
When not in use, store the A710 and A711 in the original Anti-Static bag if possible and in a nonHumid place. Optimum storage temperatures for best shelf life should not exceed +35°C or be less
than -10°C.
A710 Adjustment Locations
FIGURE 17: A710 Adjustment Locations
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2.14
POST-INSTALLATION ADJUSTMENT LOCATIONS
A711 Adjustment Locations
FIGURE 18: A711 Adjustment Locations
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2.15
POST-INSTALLATION ADJUSTMENTS
After installation, the A710 and A711 may require adjustment of some functions to compensate for
airframe and equipment specific issues, and to suit user tastes. Locations of these adjustments are
as shown in Section 2.14 and are essentially identical for both units. All are 20-turn miniature trim
pots, except as noted. “TAPE” input may be for any entertainment audio feed, such as CD, tuner,
etc.
NOTE: Back adjustments (alerting) are NOT normally field adjusted, unless required. The 37 Pin
connector (not required) above the adjustments may be removed to facilitate the adjustment of the
alerting pots. Be extremely careful of any adjustments to these settings, as incorrect levels will be
highly problematic in the airframe. These are normally bench adjustments.
The unit adjustments are as follows:
ADJUSTMENT
NAME
LOCATION
PROCEDURE / PURPOSE
NOTES
Top
Adjusts “Direct” input J210-3/22,
an un-switched input,
set as required.
Often not used in installation.
Preset, Set to desired level, if
required
Back
Adj. for comfortable voice
recording level (record key
pressed for sample, then
playback to listen)
Too sensitive will
increase noise floor. Not
normally a field setting. Only
applicable to –3, –4,
–7 and –8 variants.
Back
Adj. for comfortable alert
playback level (activate any
alert), and voice recording
playback level.
Too high will be
disruptive for pilot. Too low
will kill the voice alerting.
Adjust with CAUTION! Not
normally a field setting.
Only applicable to –3, –4,
–7 and –8 variants.
ICS Low Cut
R/H Side
Sets low frequency cut-off
(BASS) of ICS audio. Useful for
removing very high levels of
cabin low frequency noise on the
intercom.
Not normally a field setting.
TAPE Hi Cut
R/H Side
Sets high frequency cut-off
(TREBLE) of TAPE audio.
Preset, Set to desired level, if
required
TAPE Low Cut
R/H Side
Sets low frequency cut-off
(BASS) of TAPE audio.
Preset, Set to desired level, if
required
R/H Side
Sets muting level of TAPE audio
during ICS or TX operations.
May be muted completely OFF,
or set to a lower level during
these operations.
Preset to OFF, Set to other
desired level, if required.
R/H Side
Sets sensitivity of the TAPE
audio input channels. Note
that this input is NOT set by
the front panel RX control.
Preset, Set to desired level,
if required for specific
system. Do not make too
sensitive, or noise floor will
suffer
Direct Input Level
Voice Alerting
Input Level
Voice Alerting
Output Level
TAPE Mute Depth
TAPE Volume
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ADJUSTMENT
NAME
LOCATION
RX Mute Depth
L/H Side
Upper
Sets mute level of RX audio
during TX operations
(Sidetone).
Preset for 6 dB at midvolume control. Set to other
desired level, if required.
RX Hi Cut
L/H Side
Upper
Sets high frequency cut-off
(TREBLE) of RX audio.
Preset, Set to desired
level, if required.
RX Low Cut
L/H Side
Upper
Sets low frequency cut-off
(BASS) of RX audio.
Preset, Set to desired
level, if required.
ICS Mute Depth
L/H Side
Upper
Sets Mute depth of ICS audio
during TX operations.
Preset, Set to desired
level, if required.
L/H Side
Upper
Sets high frequency cut-off
(TREBLE) of ICS audio. Useful
for removing very high levels of
cabin high frequency noise on
the intercom.
Preset, Set to desired
level, if required.
L/H Side
Lower
Sets ICS talk level and audio
exported to other units in the
airframe. Normally set to midposition.
Single-turn pot. Should
be set to lowest level that is
acceptable, to reduce ICS
noise. Normally set to midposition.
L/H Side
Lower
Sets TX Mic level and audio
exported to transceivers in the
airframe. Normally set to midposition.
Single-turn pot. Should
be set to lowest level that is
acceptable, to reduce TX
mic noise. Normally set to
mid-position. Should be
similar to level from pilot’s
Mic output during
emergency operation.
L/H Side
Lower
Sets VOX offset for passengers.
Allows for differing Mics or
ambient conditions. PAX VOX
Single-turn pot. Should
tracks front panel VOX control
be set to mid-position
but is offset by this adjustment,
unless change required.
which can be more or less
sensitive. Normally set to midposition.
L/H Side
Lower
Sets time dwell or delay of VOX
circuit, once activated. Too
short will result in choppy VOX
operation, too long will allow
VOX to remain open when no
voice is present.
ICS Hi Cut
ICS Talk Level
TX Mic Level
PAX VOX Trip
VOX Delay
PROCEDURE / PURPOSE
A710/A711 Installation & Operating Instructions
NOTES
Single-turn pot. Should
be set to mid-position
unless change required.
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J201 (above) may be removed to make these adjustments
FIGURE 19: Back - Alerting Adjustments
The following is only applicable to –13, –14, –17, and –18 variants:
ADJUSTMENT
NAME
LOCATION
PROCEDURE / PURPOSE
NOTES
Alert Level
Back
Adj. for comfortable alert level,
controls both direct input
(option) and tone generator
Too sensitive will
increase noise floor. Not
normally a field setting.
1 / 2 Tone
Back
Adj. for closest Alert 1 and
Alert 2 tone match to
existing alert horn sound.
Not normally a field
setting.
1 / 2 Rate
Back
Adj. for closest Alert 2 pulse
rate match to existing
alert horn sound.
Not normally a field
setting.
3 Tone
Back
Adj. for desired
Alert 3 tone range.
Not normally a field
setting.
3 Rate
Back
Adj. for desired
Alert 3 pulse rate.
Not normally a field
setting.
3 Time
Back
Adj. for desired
Alert 3 activation interval.
Not normally a field
setting.
Testing or adjusting alerting functions requires airframe conditions to be set up to trigger the
desired alerts, never perform adjustments in flight.
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Unit modifications that can be set in the field during installation:
Internal, removable jumpers may be set for the following items (DEFAULT is BOLD):
Main RX Board
PILOT HEADSET Impedance:
150/600 or 8/20 ohms
SPEAKER AUDIO:
RX Audio
TAPE Audio
ON/OFF
ON/OFF
HEADSET AUDIO:
TAPE Audio
ON/OFF
RX VOL MIIN:
Set to 5% or Set to 0%
Internal, removable jumpers may be set for the following items (DEFAULT is BOLD):
Mic Processor Board
PAL OPT 1:
Jumpered
PAL OPT 2:
Jumpered
OPT 3 (Pil. TX Muting)
Jumpered
The following has a solderable jumper:
Main RX Board
COM7 RX Audio
Set On, Set Switched, Set OFF
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SECTION 3: OPERATING INSTRUCTIONS
3.1
FRONT PANEL OPERATOR’S SWITCHES AND CONTROLS
This section explains the operation of the A710 & A711 ACCESS/A Audio Controls and how to use
either system in a typical aircraft environment. Since the controls on the two units differ only in the
extra receive monitor pots at the top of the A711, the A710 illustration is used for all of the
explanations, except those specific to the A711. All normal user controls are on the front panel of
the unit and are either variable rotating controls or selectable push-button switches.
The exact radio legends on the face of the A710 or A711 may vary from the illustration shown, due
to customer specifications, and the final legend insert that is installed for the specific aircraft
installation. A full view of the controls is given in Figure 19.
FIGURE 20: A710 Front Panel Operator’s Switches and Controls
•
The top row of round push-buttons selects the RX or RECEIVER audio to be sent to the crew
headsets.
•
The bottom row of square push-buttons selects the TX or TRANSCEIVER to be used when
transmitting.
•
Any combination of RX sources may be selected at one time, for system monitoring purposes.
•
The corresponding RX audio of any TX selection is made AUTOMATICALLY whenever a TX
button is depressed. This function is often referred to as Auto-RX select.
•
The knobs at the right side of the unit adjust ICS VOLUME, RX VOLUME, and the trigger or
VOX LEVEL of the INTERCOM, as well as its exact mode of operation.
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3.1.1
INTERCOM KEYING MODE AND SENSITIVITY CONTROL
This adjustment selects how the intercom will activate. In the VOX (Voice Activated) mode, the
audio produced by any of the microphones will break the squelch of the intercom and the audio will
be routed through the system. The threshold audio level required to break the squelch is adjusted
by this knob. Turning the knob more clockwise makes the system more sensitive to incoming mic
audio. A fully clockwise setting on the knob will leave the intercom on at all times, giving LIVE or
HOT MIC operation. When set fully counter-clockwise, in the switch detent position, the intercom is
in the KEYED mode, will only produce audio when the intercom PTT line is keyed.
While the co-pilot, pilot, and passengers have individual mic VOX gates (3 in total), they are
controlled from a common front panel control. Individual gating reduces the amount of unwanted
noise when the intercom is triggered and makes intercom communication more intelligible as a
result. The passengers may have their VOX threshold offset by an internal adjustment (PAX VOX)
to accommodate differing headset types or ambient noise conditions.
With only a single A710 or A711 control, best operation of all ICS functions is obtained when the
microphones are all of the same type (or have very similar characteristics). Headsets with
significantly different microphones or earpiece efficiencies make it difficult to achieve satisfactory
control adjustments for all users, unless they also have individual level controls. Good quality
headsets, such as David Clark, Telex, or Bose, with noise reducing, amplified dynamic
microphones and individual headset volume controls, give the most effective and user-adjustable
performance, and minimal system difficulties. Use of “clone” headsets that visually resemble these
higher quality units (but have much poorer electrical and acoustic performance) is strongly
discouraged, as the entire system operation will suffer. This is especially true under high noise
conditions or continuous rough use. Marginal headsets will compromise the ship’s entire audio
system.
Full CCW:
Keyed ICS/PTT
Full CW:
Live/HOT Mic
VOX
CONTROL
FIGURE 21: A710 ICS / INTERCOM Controls
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3.1.2
ICS OR INTERCOM VOLUME CONTROL
The ICS LEVEL knob controls the intercom volume level for all users. Fully clockwise is the
maximum volume level and counter-clockwise the minimum. The ICS volume can be set to zero,
but has the internal capability to be preset to a low minimum value, if desired.
ICS audio is normally muted during TX operations, but may be adjusted internally for a user
specified muting depth, or the muting function may be disabled by jumper selection.
ICS LEVEL
CONTROL
(Inner)
RX LEVEL
CONTROL
(Outer)
FIGURE 22: A710 LEVEL / VOLUME Controls
3.1.3
RX OR RECEIVE VOLUME CONTROL
The RX LEVEL knob controls the volume level of all the system receivers. Fully clockwise is the
maximum volume level, and counter-clockwise the minimum. RX audio is derived from both the
receivers (such as NAV aids) and the transceivers (Comms, etc.) in the system. The RX audio level
cannot be set to zero and has an internal minimum level setting.
RX audio is normally partially muted during TX operations and is adjustable internally to the desired
level for TX sidetone. Note that sidetone must come from the radio itself.
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3.1.4
RX OR RECEIVE SELECTORS
These 10 push-button RX SELECTOR switches allow the crew to monitor any combination of the
Receivers in the airframe system, independent of the setting of the transceiver selectors. The RX
SELECTORS have an alternate action, push in to activate the audio and push again to have the
switch return to the out position and off.
Any number or combination of RX switches may be used at the same time. Note that the
corresponding RX audio is always automatically selected by a TX SELECTOR, and the matching
RX switch does not have to be selected as well. Com7 (also the PA position) does not have a
separate RX monitor switch; its audio is turned on only when the TX selector for COM7 is pushed.
RX MONITOR
SWITCHES
STATUS
INDICATOR LED
TX SELECT
SWITCHES
FIGURE 23: A710 RX & TX Selectors
3.1.5
TX OR TRANSCEIVER SELECTORS
The setting of the TX SELECTOR switches determines which transceiver will transmit the activated
microphone audio and which receiver the system will monitor, independent of the additional RX
switch settings. The buttons have an interlocking action, and pressing one button will automatically
de-select any other that is already activated. If two buttons are depressed at the same time,
simulcast operation (on two radios) is enabled.
The buttons change from black to white when activated, and a corresponding STATUS LED
illuminates green above the button. If a PA is installed, the button itself turns yellow to warn of
potential live broadcast of audio outside the aircraft. The LEDs turn yellow when the specific
transmitter is activated by the A710/711. All the LEDs will extinguish if all transmitter buttons are
returned out to the off (black) position and no transmitter has been selected. This indicates that no
valid TX mode has been selected by the crew.
In the EMERGENCY MODE, the radio(s) selected by this group of switches is sent directly to the
pilot’s headset, bypassing all of the internal power amplifiers and other electronics.
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3.1.6
EMERGENCY SWITCH OPERATION & STATUS LEDs
The operation of the A710 control can be changed from NORMAL to EMERGENCY operation in
two different ways. First, if DC power fails to the unit, the internal auto-emergency function is
enabled, which transfers the unit to a passive emergency mode to enable critical communication to
continue for the pilot. This auto-switch-over is indicated by all STATUS LEDs going black (including
the one over the emergency switch).
Second, the PILOT EMERGENCY SWITCH can be depressed, (alternate action), which will force
this transfer. In this mode, the STATUS LED above the switch changes from green to deep orange,
and the button itself turns orange.
In either case, the PILOT (or primary user of the control) is connected directly to the radio that has
been selected by the TX SELECTOR switch. Boom Mic Transmit operates normally, as does
receive, but the headset power level is reduced to the passive (un-amplified) radio level. All internal
electronics are bypassed for the pilot, which permits some level of operation even with massive
equipment failure or loss of power.
When the pilot emergency switch is used to shift to emergency operation, the other users of the
control are essentially un-affected, and continue to operate on the ICS & music circuit. This mode
may also be used as a “Pilot Isolate” function, as all radio audio is disabled to the passengers and
only the tape and ICS audio remain.
STATUS
INDICATOR LED
EMERGENCY
SWITCH
FIGURE 24: A710 Status LEDs & Emergency Switch
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3.1.7
A711 RX MONITOR LEVEL CONTROLS
The operation of the A711 control differs slightly from the A710, in that individual receive monitor
controls are provided to adjust the level for each of the 7 transceivers. In addition, an optional 8th
control can be used to adjust either music or speaker level. These controls normally go to
approximately 2-5% level at the minimum setting (not off) but can be strapped internally to go fully
off, if required. Selecting the input “off” is normally done by the setting of the RX monitor switch, not
the level control. This is a safety feature, to prevent accidental total loss of incoming communication
due to an inadvertently low level pot setting.
If the 7th transceiver position is used for a PA, the 7th level control can be mapped to the
corresponding COM7 RX position and internally set “ON”. This allows an AUX (un-switched) input
to be supported via this control position.
RX MONITOR
LEVEL CONTROLS
MUSIC/SPEAKER
LEVEL CONTROL
FIGURE 25: A711 RX Monitor Level Controls
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3.2
SPECIAL SIGNAL CONSIDERATIONS
There are several special signals and lines related the A710 and A711, which require careful
installation planning and understanding by the flight crew.
3.2.1
DIRECT AUDIO CONNECTIONS
The A710 has two different un-switched, direct audio inputs. One is routed directly to the Pilot’s
headset output via a resistive pad. This is used when an existing airframe threat alerting system
must be tied directly to the pilot’s headset. This function is active when in either the normal or
emergency mode, and its volume is a function of the external generating source and the headset
impedance. This should be tested (if implemented) to ensure adequate headset level is possible in
the specific application. Note that this connection may be unusable in the LOW IMPEDANCE (8-20
ohm) headset mode, if the alerting system cannot deliver enough level. Excessive loading back
through this connection may reduce headset volume, or adversely affect the pilot’s headset, so be
certain this function is correctly implemented.
The second direct input is un-switched only, and is mixed with the regular RX audio bus. It will be
partially muted during TX operation, and must be used carefully to ensure correct system operation.
This signal should NOT be wired in the harness if not needed, as it will serve merely as a source of
noise if left stowed in the aircraft wiring. It cannot be switched off, and will be lost during emergency
operation, as only the 7 transceivers are routed to the emergency headset bus.
3.2.2
SUM NODE
This line is used to expand the RX input bus of the A710 control and allows many supplemental
receivers to be attached with high isolation from other signals. Use of either the A770 or A775
eyebrow expansion units is required to tie to this line. Signals directed to this input will be muted
during TX operation, just as for any other RX input.
3.2.3
VOICE ALERTING (Applicable to –3, –4, –7, and –8 Variants Only)
The A710 supports the installation of an optional alerting module that can be either tone or “true
voice” alerting, with spoken alert messages. The alerting voice messages function as follows:
Alerting messages are activated by a ground trigger at the corresponding input pin, and play the
number of times, and in the way indicated, once the alert line is triggered.
The highest priority message is played first, then succeeding messages in order. An incoming
higher priority message interrupts a lower priority one immediately. An incoming lower priority
message plays once all higher priority messages have played first. The inter-message pause is
0.5 second. Multiple messages are sequenced starting with the highest priority, and going in
order to the lowest.
Warning, Engine Failure
1, Critical
FORMAT
MESSAGE
LENGTH
Repeat continuously ~2 sec.
Warning, Low Rotor RPM
2, Critical
Repeat continuously
~2 sec.
Pin 14, Alert 2
Warning, Engine Overtemp
3, Critical
Repeat continuously
~2 sec.
Pin 13, Alert 3
Caution, Decision Height
4
Repeat 2 times
~2 sec.
Pin 12, Alert 4
Caution, Check Display
5
Repeat 2 times
~2 sec.
Pin 11, Alert 5
Intercom Call
6
One time
~2 sec.
Pin 10, Alert 6
ALERT MESSAGE
PRIORITY
A710/A711 Installation & Operating Instructions
INPUT PIN
Pin 15, Alert 1
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A typical voice-alerting fault sequence is illustrated below:
An engine fails due to contaminated fuel or snow ingestion. The engine fails, followed by an
eventual low rotor condition, and during descent, a decision height warning.
•
Event Starts:
(engine failure detected), alerts begin:
•
Warning, Engine Failure
Warning, Engine Failure
(pause)
Warning, Engine Failure
(pause)
(Low rotor detected), new alert added, since higher priority has already played:
•
•
•
Warning Low Rotor RPM
Warning Low Rotor RPM
Warning Low Rotor RPM
(pause)
(pause)
Warning, Engine Failure (pause)
Warning, Engine Failure (pause)
(Decision height detected), new alert added, since higher priorities have already played.
DH plays only twice:
•
•
•
Caution, Decision Height
Warning Low Rotor RPM
Caution, Decision Height
Warning Low Rotor RPM
Warning, Engine Failure
(pause)
Warning, Engine Failure (pause)
(pause)
Warning, Engine Failure (pause)
(pause)
Warning Low Rotor RPM
In normal descent, the following is the Decision Height sequence:
(Decision height detected), alerts begin:
•
Caution, Decision Height
(pause)
Caution, Decision Height (alert ends)
For an intercom call, the following is the call sequence:
(Press ICS call switch):
•
Intercom call
(alert ends)
(If no answer, pressed again)
•
Intercom call
(alert ends)
If user defined alerts are used, they default into these priorities, unless over-ridden at
programming time to another pattern. In all cases, the priorities of alerts remains Alert 1 over
all others, then Alert 2, etc. to Alert 6.
Tone alerting provides the following tones:
Continuous tone
Two-tone siren
Swept siren
Tone Pulses
Tone Pair Pulses
Chime
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3.2.4
VOICE STORAGE FUNCTION
If the voice alerting module is installed, it is also possible to store any audio in the system as a voice
message and play it back as required. Two external switches, RECORD and PLAYBACK are
required in a convenient place, to control this function. A center-off, spring-loaded switch can be
used for this function. Up to 30 seconds of audio may be stored in this way for later review at any
time.
Voice storage is non-volatile, and remains in place even after powering down the unit, but is LOST if
a new message is recorded, regardless of length. The audio may originate from the receivers or the
intercom and this function may also be used as a voice notepad for recording in-flight notes, simply
by hitting record while talking on the intercom.
This function can be very convenient for recording an in-flight observation, flight clearance,
maintenance problem, or other data. The contents are over-written when the RECORD button is
pressed again but may be replayed by the PLAYBACK switch an unlimited number of times.
3.2.5
TONE ALERTING (Applicable to –13, –14, –17, and –18 variants only)
The A711L supports the installation of optional tone alerting. The alerting tones function as
follows:
Alerting tones are activated by a ground trigger at the corresponding input pin, and play once the
alert line is triggered. The #3 (DH) alert is timed, and the #2 alert, (Low Rotor) over-rides tone #1
(Engine Failure). The tone level, frequency, pulse rate and time are all field adjustable for the best
match to existing Sonalerts in the cockpit and user preferences. Always confirm alerting is
working correctly and is at an acceptable level before completing any installation.
Alert Function
3.2.6
Corresponding
Tone Input
Format
Input Pin
Engine Failure
1 (Steady tone)
Repeat continuously
Pin 15, Alert 1
Low Rotor RPM
2 (Pulsing tone)
Repeat continuously, overrides tone 1
Pin 14, Alert 2
Decision Height
3 (Two-tone)
Timed, 2-3 sec. typical
Pin 1, Alert 3
SPEAKER AUDIO
The A710 and A711 have a speaker channel that may be used to provide cabin monitoring of
signals when parked on the ramp, during troubleshooting, or for in-flight use if cabin noise permits.
This is an optional connection and does not have to be used. The speaker level is driven by the
same controls as the headset level, but it does not provide any microphone related audio (to avoid
feedback), such as ICS.
The specific audio sources routed to the speaker channel may be programmed with jumpers
internally, and it may be used as a “music only” feed for a passenger cabin area if desired. Alerting
is NOT routed to the speaker channel.
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3.3
CHANGING OVERLAY LIGHTING & RADIO LEGENDS
The legends on the A710 and A711 front panels, and the overlay color and lighting type, can all be
easily changed in the field to suit special requirements. The entire lit overlay is changed by
removing three screws, as illustrated below. Remove the knobs (using a 0.050” Allen/Hex key to
undo the set screws) and the overlay assembly will pull off. A small polarized square plug on the
rear mates with the lighting assembly and can be pulled off to allow the overlay to be completely
removed and exchanged. If the lighting VOLTAGE is changed, the internal connection must also be
changed, as well as the overlay. See the service manual for details.
The legend insert is adhesive and can be removed by lifting a corner free with a sharp X-acto knife
blade, and then gently pulling the entire Lexan strip free. Remove the backing from a new legend
strip (with the desired legends), line it up evenly, and press it into place on the overlay recess. The
adhesive will cure fully in 48 hours. Be sure any bubbles are pressed out, and that all edges are
firmly attached.
LIGHTED
OVERLAY
LEGEND
INSERT
FIGURE 26: Overlay & Legend Insert
REMOVE THESE
3 SCREWS
FIGURE 27: Removing the Entire Overlay Assembly
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Technisonic Industries Limited
240 Traders Blvd., Mississauga, ON Canada L4Z 1W7
Tel: (905) 890-2113 Fax: (905) 890-5338
IMPORTANT
WARRANTY
All communication equipment manufactured by Technisonic Industries Limited is
warranted to be free of defects in Material or Workmanship under normal use for a period
of one year from Date of Purchase by the end user.
Warranty will only apply to equipment installed by a factory approved and/or authorized
facility in accordance with Technisonic published installation instructions. Equipment
falling under the following is not covered by warranty:
• Equipment that has been repaired or altered in any way as to affect performance,
• Equipment that has been subject to improper installation,
• Equipment that has been used for purposes other than intended,
• Equipment that has been involved in any accident, fire, flood, immersion, or subject to
any other abuse.
Expressly excluded from this warranty are changes or charges relating to the removal and
re-installation of equipment from the aircraft. Technisonic will repair or replace (at
Technisonic's discretion) any defective transceiver (or part thereof) found to be faulty
during the Warranty Period.
Faulty equipment must be returned to Technisonic (or its authorized Warranty Depot) with
transportation charges prepaid. Repaired (or replacement) equipment will be returned to
the customer with collect freight charges. If the failure of a transceiver occurs within the
first 30 days of service, Technisonic will return the repaired or replacement equipment
prepaid.
Technisonic reserves the right to make changes in design, or additions to, or
improvements in its products without obligation to install such additions and
improvements in equipment previously manufactured. This Warranty is in lieu of any and
all other warranties express or implied, including any warranty of merchantability or
fitness, and of all other obligations or liabilities on the part of Technisonic.
This Warranty shall not be transferable or assignable to any other persons, firms, or
corporations.
For warranty registration, please complete the online
Warranty Registration Form found at www.til.ca.
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