SM18
AA24/AA25 Series
Single User Audio Controller
INSTALLATION AND OPERATION MANUAL
REV 4.00 November 21, 2003
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna BC, Canada
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Copyright 2003 by Northern Airborne Technology
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM18 Rev 4.00 |
AA24/AA25 Single Series Audio Controller Manual |
Periodically NAT will release manual amendments. In order to maintain the most accurate and up to date manual these amendments should be carried out immediately upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment |
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Jan 23/06 |
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Insert any Amendment Instruction sheets after this page.
Nov 21, 2003 |
Page ii |
ENG-FORM: 820-0109.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
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Manual: SM18 (AA24/AA25) |
Amendment #: 1 |
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Document # SM18\Install_Ops\809-0001 |
Amendment Date: Jan 23, 2006 |
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The purpose of this amendment is to add the most recent revisions of drawings to the manual.
Amendment Instructions:
1 |
Remove Pages |
Replace With Pages |
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2-5 Rev 4.00 |
2-5 Rev 4.00 Amendment # 1 |
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Remove Drawings (Section 2) |
Replace or add Drawings (Section 2) |
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AA24-001\405-0 Rev 1.01 |
AA24-001\405-0 Rev 1.02 |
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AA25-001\405-0 Rev 1.01 |
AA25-001\405-0 Rev 1.02 |
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Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
3Update the Amendment Record sheet at the front of the manual.
4Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages
Amendment # 1 |
Jan 23, 2006 |
Page 1 |
ENG-FORM: 809-0109.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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SM18 Rev 4.00 |
AA24/AA25 Single Series Audio Controller Manual |
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Table of Contents |
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Section |
Title |
Page |
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1.0 |
Description |
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1.1 |
Introduction |
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1-1 |
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1.2 |
Purpose of Equipment |
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1-1 |
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1.3 |
Features |
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1-1 |
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1.4 |
Specifications |
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1-2 |
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1.4.1 |
Electrical Specifications |
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1-2 |
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1.4.2 |
Physical Specifications |
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1-3 |
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1.4.2 |
Environmental Specifications |
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1-4 |
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1.5 |
Unit Nomenclature |
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1-4 |
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2.0 |
Installation |
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2.1 |
Introduction |
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2-1 |
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2.2 |
Unpacking and Inspection |
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2-1 |
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2.2.1 |
Warranty |
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2-1 |
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2.3 |
Installation Procedures |
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2-1 |
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2.3.1 |
Warnings |
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2-1 |
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2.3.2 |
Cautions |
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2-2 |
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2.3.3 |
Cabling and Wiring |
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2-2 |
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2.3.4 |
Fuses and Breakers |
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2-2 |
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2.3.5 |
Adjustments |
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2-2 |
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2.3.6 |
Post-Installation Checks |
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2-3 |
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2.4 |
Continued Airworthiness |
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2-3 |
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2.5 |
Accessories Required But Not Supplied |
2-4 |
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2.6 |
Installation Drawings |
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2-5 |
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3.0 |
Operation |
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3.1 |
Introduction |
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3-1 |
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3.2 |
General |
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3-1 |
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3.3 |
Controls and Indicators |
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3-1 |
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3.3.1 |
Transmit selection |
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3-1 |
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3.3.2 |
Receiver/Transceiver Selection |
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3-2 |
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3.3.3 |
Volume Control |
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3-2 |
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3.3.4 |
VOX Mode Control |
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3-2 |
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3.3.5 |
Audio Alerting Functions |
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3-2 |
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Nov 21, 2003 |
Page iii |
ENG-FORM: 820-0109.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM18 Rev. 4.00 |
AA24/AA25 Series Single User Audio Controller Manual |
Section 1.0 Description
1.1Introduction
This manual contains information on the AA24/AA25 Series Single User Audio Controller.
All derivatives will be covered by manual supplements which can be obtained from NAT as required.
Information in this section consists of purpose of equipment, features and specifications.
1.2Purpose of Equipment
The AA24/AA25 series single-user Audio Controllers support one headset per box.
Connection to other users in the system is made through the ICS Tie line. The small size and extensive radio and ICS functions make this unit an excellent choice for multistation aircraft.
The AA24/AA25 series systems provide full boom-mic transmit and ICS functions for the user. The front panel controls permit user adjustment of frequently needed signals, such as intercom audio level, VOX threshold, and individual radio receive levels. Internal adjustments set default values for direct audio level and artificial side tone.
1.3Features
The AA24/AA25 series systems employ NAT's unique audio processing which reduces noise and tailors the frequency response to produce clean, crisp intercom audio. Having high output power and low distortion results in better on-board communication.
Inputs are fully floating and include a dedicated alerting input. The tie line of the
AA24/AA25 series is fully compatible with other NAT systems including AA80, AA82, AMS40 and AA95 series units. By keeping ‘ICS TIE LINE’ characteristics fully compatible with existing NAT products, it is possible to chain multiple systems together to a maximum of 4 units. The AA24/AA25 series have over-voltage and reverse-voltage protection, to ensure operability in severe aircraft environments. A front panel annunciator allows easy visual setting of the ‘VOX’ threshold, and also indicates transmit operation. In addition to all common features the AA25 also provides independent radio volume adjustment of up to 6 sources.
Nov 21, 2003 |
Page 1-1 |
ENG-FORM: 800-0106.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
AA24/AA25 Series Single User Audio Controller Manual |
SM18 Rev. 4.00 |
1.4Specifications
1.4.1Electrical Specifications
Power supply |
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Voltage |
28 Vdc (reverse and over voltage protection) |
Current |
400 ma. max. |
Lighting |
28 Vdc @ 160 mA. |
Headset Power |
Phone output is nominal 600 Ω load |
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Short circuit protected |
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Typical 200 mW into headset |
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David Clark H10-30/40 series recommended |
Microphone |
Industry standard ‘carbon equivalent’ type |
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250 mVrms for full output |
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Amplified dynamic microphone preferred |
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David Clark M1/DC, M3, M4 recommended |
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(For low Z microphones, AA24-801 or AA25- |
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801 are recommended) |
Indicators |
Transmit (green LED) |
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VOX ICS triggered by ICS Tie Line (red LED) |
Input Signals: |
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4 aircraft transceiver radio inputs |
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5 navigational receiver inputs |
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2.5 V rms for full output |
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4.7 kΩ input impedance |
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1 bi-directional ICS tie line |
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1 Vpp for full output |
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2.2 kΩ input impedance |
Keylines |
Transmit key is active low (33 ma. of current) |
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Intercom key is active low (1 ma. of current) |
Intercom line |
NAT ICS tie line compatible 2k input impedance |
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(340 mVrms level) |
Page 1-2 |
Nov 21, 2003 |
ENG-FORM: 800-0106.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM18 Rev. 4.00 |
AA24/AA25 Series Single User Audio Controller Manual |
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Output signals: |
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Transmitter audio lines |
Non-adjustable, microphone connected directly |
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to radio. (mic bias supplied by radio) |
Transmitter key lines |
Hard ground output (relay contacts 1 amp. |
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max.) |
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Green L.E.D. annunciator |
Intercom line |
340 mVrms into 2 k ohms |
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(freq. response +/- 6 db from 250 to 4000 Hz) |
Headset |
output |
200 mW max. into 600 ohms (floating output) |
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300 mW max. into 150 ohms |
Receive channel |
freq. response +/- 6 dB from 300 to 5000 Hz |
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Intercom channel |
freq. response +/- 6 dB from 500 to 3100 Hz |
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Sidetone channel |
freq. response +/- 6 db from 225 to 5000 Hz |
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Direct input |
freq. response +/- 6 db from 275 to 3100 Hz |
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Distortion |
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<2% THD |
Isolation /crosstalk |
>60 db min. |
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Signal/noise ratio |
70 db min. |
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1.4.2Physical Specifications
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AA24 |
AA25 |
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Height |
1.49" |
37.8 mm |
2.62" |
66.7 mm |
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Depth (max.) |
7.55" |
191.8 mm |
7.44" |
188.8 mm |
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Depth behind panel |
5.84" |
148.3 mm |
5.83" |
148.0 mm |
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Width (max.) |
5.75" |
146.0 mm |
5.75" |
146.0 mm |
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Width behind panel |
4.9" |
124.5 mm |
4.9" |
124.5 mm |
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Weight |
1.2 lbs |
500 g |
1.5 lbs |
680 g |
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Mounting |
standard Dzus rails |
standard Dzus rails |
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Nov 21, 2003 |
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Page 1-3 |
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ENG-FORM: 800-0106.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
AA24/AA25 Series Single User Audio Controller Manual |
SM18 Rev. 4.00 |
1.4.3Environmental Specifications
Operating Temperature |
-40° C to +70° C |
Storage Temperature |
-55° C to +85° C |
Altitude |
25,000 ft. max. |
Humidity |
95 % Non-Condensing |
Vibration |
DO-160B category P, panel mounting 6g. |
Shock |
12 g. (any axis) |
1.5Unit Nomenclature
Model |
Description / Distinction |
AA24-001 |
COM1, COM2, COM3, COM4 + PA |
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NAV, ADF, DME, MKR, & AUX receive switches |
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+28 Vdc lights and +28 Vdc power |
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high impedance headset and mic |
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ICS, RX volume and VOX sq. controls |
AA25-001 |
COM1, COM2, COM3, COM4 + PA |
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NAV, ADF, DME, MKR, & AUX receive switches |
COM1 - 4, NAV & ADF level controls +28 Vdc lights and +28 Vdc power high impedance headset and mic ICS, RX volume and VOX sq. controls
End of section 1.0
Page 1-4 |
Nov 21, 2003 |
ENG-FORM: 800-0106.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM18 Rev. 4.00 |
AA24/AA25 Series Single User Audio Controller Manual |
Section 2.0 Installation
2.1Introduction
Information in this section consists of: unpacking and inspection procedures, installation procedures, post-installation checks, and installation drawings.
2.2Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to shipping and report all such claims immediately to the carrier involved. Note that each unit should have the following:
-AA24-001 or AA25-001 Audio Controller
-Warranty Card
-Operator’s Manual
-Release certification
Verify that all items are present before proceeding and report any shortage immediately to your supplier.
2.2.1Warranty
Complete the warranty card information and send it to NAT when the installation is complete. If you fail to complete the warranty card, the warranty will be activated on date of shipment from NAT.
Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this equipment in accordance with applicable regulations. NAT Ltd’s warranty is not valid unless the equipment is installed by an authorized NAT Dealer. Failure to follow any of the installation instructions, or installation by a non-certified individual or agency will void the warranty, and may result in a non-airworthy installation.
2.3Installation Procedures
2.3.1Warnings
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any logic, audio, or DC power lines from this unit with 400 Hz synchro wiring or AC power lines. Do not position this unit next to any device with a strong alternating magnetic field such as an inverter, motor or blower, or significant interference to operation will result.
Nov 21, 2003 |
Page 2-1 |
ENG-FORM: 805-0105.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
AA24/AA25 Series Single User Audio Controller Manual |
SM18 Rev. 4.00 |
2.3.2Cautions
In all installations, use shielded cable exactly as shown and ground as indicated. Significant ground loop and noise problems may result from not following these guidelines.
Do not ground the microphone or headphone jacks.
Do not connect the microphone and headphone shields together.
Use caution when routing microphone and ICS Tie Line wiring, as they are low level signals prone to coupling from other sources.
Do not take a ground from the instrument panel or similar location that shares a ground return with a turn and bank, horizon or other motor driven instrument. This may cause the InterVox unit to pick up the sound of the motor as ground loop interference.
For best results, all headsets/microphones in the system should be of the same type to avoid VOX problems and uneven volume.
2.3.3Cabling and Wiring
All unshielded wire should be Tefzel MIL-M-22759/16 or equivalent. For shielded wire applications, use Tefzel MIL-M-27500 shielded wire with solder sleeves (for shield terminations) to make the most compact and easily terminated interconnect. Follow the wiring diagrams in Section 2.6 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring is complete.
All wiring should be at least 22 AWG, except power and ground lines which should be at least 20 AWG. Ensure that all ground connections are clean and well secured.
2.3.4Fuses and Breakers
Power protection should be provided through a 1.0 A breaker, and not attached to any other existing breaker without additional protection.
2.3.5Adjustments
See 3D drawing AA24\001\903-0 at the end of this section of the manual for the adjustment locations.
The unit ships from the factory with all internal adjustments set to the normal test levels. Once installed in the aircraft, it may be desirable to change some of these settings to best suit the local operating environment.
Page 2-2 |
Nov 21, 2003 |
ENG-FORM: 805-0105.DOT |
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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