Filser Electronic ATR 720 C Installation Manual
ATR 720 C
VHF TRANSCEIVER
INSTALLATION
Handbook No.:003.8000
Issue: 01/04/1998 720C installation Man.DOC
MANUAL
Filser Electronic GmbH
Gewerbestraße 2 ATR 720 C Communications Transceiver
86875 Waal page 2
The following
INSTALLATION MANUAL
Has validity for the ATR 720 C Communications Transceiver
LIST OF EFFECTIVE PAGES
The List of effective pages lists all the pages contained in the Maintenance Manual.
LIST OF EFFECTIVE PAGES
Page No.: Issue Page No.: Issue
Cover 6-98
Section 6-98
Section I 6-98
Table of Contents
1 SECTION GENERAL INFORMATION...........................................................3
1.1 INTRODUCTION ..............................................................................................................3
1.2 PURPOSE OF EQUIPMENT...........................................................................................3
1.3 DESIGN FEATURES........................................................................................................3
1.4 POWER REQUIREMENTS ..............................................................................................4
1.5 Technical Characteristics ..............................................................................................4
1.6 Units and Accessories Supplied...................................................................................6
1.7 Accessories Required but not Supplied......................................................................6
2 SECTION II Installation and Operation......................................................7
2.1 General.............................................................................................................................7
2.2 Unpacking and Inspecting..............................................................................................7
2.2.1 Electrical Bench Test.................................................................................................9
2.2.2 Microphone Adjustment..............................................................................................9
2.2.3 Sidetone Adjustment.................................................................................................10
2.2.4 External Audio-Frequency Volume Adjustment........................................................10
2.2.5 Interphone Interconnection.......................................................................................11
2.3 ATR 720 INSTALLATION..............................................................................................11
2.4 PS-2814-Installation.......................................................................................................11
2.5 Antenna Installation.......................................................................................................11
2.6 Cabling............................................................................................................................12
2.7 OPERATION...................................................................................................................14
2.7.1 General.....................................................................................................................14
2.7.2 ATR 720 C COMM Multifunction Control..................................................................14
2.7.3 POST INSTALLATION CHECKOUT........................................................................15
Filser Electronic GmbH
Gewerbestraße 2 ATR 720 C Communications Transceiver
86875 Waal page 3
Rcord of Revisions
Rev. No. Revision Date Date inserted By -Name
1 SECTION GENERAL INFORMATION
1.1 INTRODUCTION
This manual contains information relative to the physical, mechanical and electrical characteristics of the communications transceiver ATR 720 manufactured by Filser Electronic GmbH .
1.2 PURPOSE OF EQUIPMENT
The ATR 720 C COMM combines in a single panel mounted unit a 720 channel VHF COMM
Transceiver with a microprozessor controlled frequency entry
1.3 DESIGN FEATURES
A. Controls
?? Multi Function Control
?? On Off Switch
?? Volume Control
?? Automatic squelch eliminates pilot responsivility for continuously monitoring squelch
adjustment. Squelch threshold automatically adjusts to open on readable signals. SQ
switch in pulled opens squelch to test COMM receiver sensitivity and to listen extremely weak signals.
?? Liquid Cristal Display
?? Keyboard with 15 keys for Function, Frequency Entry
B. Electronics
?? Variactor diode tuned filters eliminates use of mechanical tuning shafts and mech a-
nisms.
?? Transistorized transmitter provides 4 watts minimum output power and long term re-
liability superior to tube designs.
?? The digital frequency synthesizers utilize state of the art integrated circuits to replace
all but 1 crystal.
?? Crystal filter selectivity.
?? Carrier controlled squelch with carrier squelch back up functionally described above.
?? Tight AGC (typically 0.5 dB from µV to 100 mV) minimizes audio level variations.
C. Construction
?? Modular construction for simple maintenance.
?? Rack mounted, removable from the front panel.
?? Anti-theft locking mechanism.
Filser Electronic GmbH
Gewerbestraße 2 ATR 720 C Communications Transceiver
86875 Waal page 4
1.4 POWER REQUIREMENTS
The ATR 720 C requires 13.75 volts for proper operation. Aircraft having electrical power plants
producing 27.5 volts, require the installation of a voltage converter. The PS 2814 Voltage Co nverter, designed to convert 27.5 volts to 13.75 volts, may be conveniently remote mounted in the
aircraft.
1.5 Technical Characteristics
ATR 720 Transceiver
Specification Characteristic
RTCA COMPLIANCE:
Comm Transmitter RTCA Do 157, Class 4
EUROCAE ED 24
Comm Receive RTCA Do 156, Class C
EUROCAE ED 23
Environmental
Temperature Range
Altitude
MOUNTING: Panel mounted, no shock mounting
SIZE: 77x57x200 mm
WEIGHT: 8.82N (9oogr.)
Power Requirements:
COMM Receive
COMM Transmit (Tone)
CHRIYSTAL CONTROLLED:
FREQUENCY RANGE:
FREQUENCY STABILITY:
RTCA Do 160A: C4A/SM/XXXXXXZBBBB
-40°C to +55°C
35.000 ft
required
excluding external connectors and
harness.
13.75 V (or 27.5 V with PS 2814)
o1. – 0.4 amps
1.4 amps ( o.8 amps unmodulated )
720 channels
118.00 to 135.975 MHz with 25 kHz
spacing
? 0.002 %
Specification CHARACTERISTICS
ATR 720 TRANSMITTER
Filser Electronic GmbH
Within 6 dB from 350 Hz to 2500 Hz. Min
Gewerbestraße 2 ATR 720 C Communications Transceiver
86875 Waal page 5
VHF POWER OUTPUT:
Min. 4W/50 O load
Modulation: 85% modulation capability with 90%
limiting, less than 15 % distortion at 80 %
mod.
Microphone: Carbon or dynamic mike (adjustable)
Sidetone: Adjustable up to 80 mw into 200 ohm
headphones
Duty Cycle: 5 minutes on, 5 minutes off ( 50 % )
ATR 720 Receiver
Specification Characteristics
Sensitivity: 1.5 µV will provide a 6 dB minimum signal
plus noise to noise ratio
Selectivity: Typical 6 dB at ? 8 kHz, 70 dB at ? 25
kHz
Spurious Responses: Down al least 60 dB
Squelch: Automatic squelch (carrier to noise ) with
manual disable and carrier squelch
override.
AGC- From 5 µV to 20.000 µV audio output will
not vary more than 0.5 dB.
Audio
Specifications Characteristics
External Audio Input: External Audio-Frequency input with
adjustable sensitivity ( 10 mV – 1 V for
rated speaker output )
Frequency Responses:
18 dB down at 5000 Hz.
Headphone Output:
80mW into 200 O
Speaker Output: 3 Watts audio output
Interphon: Interphone capability with external switch
(refer to appropriate electrical installation
diagram in Section 2 ). .
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