Becker AR 3201 User manual

Installation and Operation
Manual DV 28110.03
Issue 1 April 1992
BECKER FLUGFUNKWERK GMBH ••Baden Airpark ••B 108
D-77836 Rheinmünster ••Telephon +49 (0) 7229 / 305-0
E-Mail info@ becker-avionics.de or [email protected]
VHF-Transceiver
AR 3201 - ( )

FIRST ISSUE AND CHANGES
Issue . . . . . 1 . . . . . April 1992
LIST OF EFFECTIVE PAGES
Page No.: Issue : Page No.: Issue :
Title
1-I - 1-II
1-1 - 1-8
2-I - 2-II
2-1 - 2-8
3-I - 3-II
3-1 - 3-6
8-I - 8-II
Annex 1 to 27
04/92
04/92
04/92
04/92
04/92
04/92
04/92
04/92
04/92
Copyright by Becker Flugfunkwerk,
All rights reserved

Table of contents
Section 1GENERAL INFORMATION Page
1.1 Introduction 1-1
1.2 Purpose of equipment 1-1
1.3 General description 1-2
1.4 Variants survey 1-3
1.5 Specifications 1-5
1.5.1 General data Transceiver 1-5
1.5.2 Receiver specifications 1-5
1.5.3 Transmitter specifications 1-6
1.5.4 Optional functions 1-7
1.6 Certification 1-7
1.7 Accessories 1-7
1.8 Scope of delivery 1-8
1.9 Software 1-8
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Section 1GENERAL INFORMATION
1.1 Introduction
The following Handbooks describe the VHF-communications transceiver AR 3201 - ( ).
The Handbooks DV 28110.03 (,, Installation and Operation ‘‘) and DV 28110.04 (,,Maintenance and
Repair‘‘) contain the following sections :
Section DV 28110.03 DV 28110.04
1General Information X X
2Installation X X
3Operation X X
4Theory of Operation X
5Maintenance and Repair X
6Illustrated Parts List X
7Modification and Changes X
8Circuit Diagrams X X
1.2 Purpose of equipment
The VHF transceiver permits transceiver communication on 760 channels in the frequency range
118.000 MHz to 136.975 MHz with a channel spacing of 25 kHz. It can also be limited to 135.975 MHz
= 720 channels by incorporating a different PROM. Extensions for additional modes such as
temperature and operating voltage measurements, etc. are provided for.
The VHF transceiver is physically designed for unrestricted application in category II aircraft. In the
environmental categories there is no limitation for application in the instrument panel and for use in
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rigid fuselage mounting in all aircraft. The VHF transceiver is designed for compliance with RTCA and
EUROCAE airworthiness requirements.
1.3 General description
TheVHFtransceiverisdesignedasasingle-blockunitwithdimensionsinkeepingwith58mmdiameter
standard instrument size. Mounting is by means of four screws (behind-panel fitting). AII controls and
indicators are located on the front panel. The rear panel locates the connector for connecting the
transceiver to aircraft wiring, the antenna socket and a test connector.
The transceiver features a single superhet receiver. A squelch circuit suppresses noise and input
signals below a specific field strength. The switching threshold is adjustable from without through the
case. The squelch can be defeated with the squelch switch.
The transmitter has wideband tuning over the range 118.000 MHz to 136.975 MHz. Transmitter output
power is greater than 5 watt. In transmitter operation sidetone is automatically on. In transceiver with
serial No. of 4000 and above, an arrow flashes on and off in the upper left side of the LCD during
transmission
The injection frequency of the receiver and the transmit frequency of the transmitter are generated by
avoltage-controlledoscillator(VCO)whichissignalledbyadigitalfrequencysynthesizerinconjunction
with a microprocessor.
The microphone input is designed for a dynamic microphone or for a standard microphone, the
transceiver being infactory-set for a dynamic microphone. Conversion to a standard microphone is
done in transceivers up to serial No. 86 by resoldering a jumper on the soldering side of the audio
module. As of serial number No. 86 the conversion is made by reconnecting a wire jumper on the
component side of the audio module. The microphone input is connected to a dynamic compressor
which maintains the modulation depth constant over a microphone input voltage range of approx.
40 dB.
Thefrequencyindicationisaliquidcrystal display(LCD). TheMHzandkHzfrequencyselectors permit
selection of the desired channel frequency. The MHz frequency selector indexes in steps of 1 MHz,
the kHz frequency selector in 25 kHz steps.
The transceiver also contains a memory for storing four different channel frequencies, even when the
transceiver is OFF. The stored frequencies are called up by the channel selector switch in positions
1 - 4. In switch position A a further channel frequency can be set which is, however, lost when the
transceiver is switched off. In transceiver with serial No. fo 4000 or above, the channelfrequency set
in position A is also stored and not deleted when the unit is powerd down.
In addition, when the VHF transceiver is powered up, a self-test function is automatically activated to
test the LCD. For a period of a few secounds, all of the segments in the LCD flash on (188.88).
Aterwards, either the frequency 121.5 MHz appears (channel selector switch in position A), or one of
the 4 stored frequencies (depending on the position of the channel selector switch). The VHF
transceiver is now ready for operation.
In Transceiver with serial No. of 4000 or above, either the most recently set frequency in channelA
appears, or one of four stored frequencies (depending on the position of the channel celector switch).
When the self-test function is activated, an arrow flashes on and off in addition to the digits 188.88
(⇐188.88).
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The transceiver also contains a stage for monitoring the aircraft supply voltage. This stage is ON as
soon as the transceiver is switched on. Should the aircraft supply voltage drop to 11 V - 10.5 V, the
readout will commence flashing.
For operation on an 28 V aircraft system a voltage regulator (VR 2011 ) is necessary. In aircraft with
no power circuit (gliders) the battery box (BK 5) is provided.
When using the emergency power unit EPU 400 the transceiver can be continued to be operated at
reduced output power (12 V operating voltage) even when aircraft power is down.
When operating the IC mode, the transceiver can be used for intercommunications.
The auxiliary audio input permits input of audio signals from other equipment in the aircraft, however,
these auxiliary audio input is standard as of module No. 471 . Up to module No. 470 this feature was
only available as an option.
If LCD illumination is required, it can be connected either directly to the operating voltage or to a
dimmer.
The standard version can be extened by optional voltage and temperature measuring facilities without
affecting the airworthiness of the transceiver.
An optional voltage and temperature measurement circuit permits measurement of either two different
voltages or two different temperatures or a single voltage and a single temperature with the aid of two
corresponding sensors and two external pushbuttons. The LCD provides indication on pressing the
external pushbuttons for approx. 4 seconds. Temperature can be indicated in Fahrenheitor Celsius.
1.4 Variants survey
Table 1 -1 surveys the variants of transceiver AR 3201 - ( ). The various variants are notdifferent in
appearance, i.e. dimensions, case depth, etc. being the same for all variants. The necessary
accessories are given in the List of Accessories at the end of Section 1 for the various variants, all of
which have no effect on airworthiness of the transceiver.
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Transceiver AR 3201-( )
Drawing No./
Order No Type Voltage measurement
Tamperature
measurement
in deg Celsius
Temperature
measurement
in deg.
Fahrenheit
760
channel 720 channel
28110-00000.000
389.528-910 AR 3201-( ) no no no yes
28111 -00000.000
397.156-910 AR 3201-(1) yes yes no yes
28112-00000.000
397.164-910 AR 3201-(2) yes no yes yes
28113-00000.000
397.172-910 AR 3201-(3) no yes two different
temperatures
no yes
28114-00000.000
397.180-910 AR 3201-(4) no no yes two different
temperatures
yes
28120-00000.000
767.018-910 AR 3201-(10) no no no yes
28121 -00000.000
767.026-910 AR 3201-(11) yes yes no yes
28122-00000.000
767.034-910 AR 3201-(12) yes no yes yes
28123-00000.000
767.042-910 AR 3201-(13) no yes two different
temperatures
no yes
28124-00000.000
767.050-910 AR 3201-(14) no no yes two different
temperatures
yes
Table 1-1
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1.5 Specifications
1.5.1 General data Transceiver
Operating voltage 12,4 V . . . 15,1 V
Emergency operation (10,0 V) Intelligible communication
Current consumption 14 V without
Panel illumination
Receive ,, stand by ‘‘ typ. 70 mA
Receive ,, stand by ‘‘ with auxiliary input typ. 90 mA
Transmit typ. 1 .8 A
Panel illumination 13,8 V / 40 mA DC
Fuse 5A
Operating temperature range D1 - 20° . . .+ 55°C,
Env. Cat. RTCA DO - 160A shorttime temperature + 70°C
Altitude max. D1 50000 ft
Env. Cat. RTCA DO - 160A
Vibration MNO
Env. Cat. RTCA DO - 160A
Dimensions
Panel 60.6 mm x 60.6 mm
Mounting depth 212.5 mm
Weight 0.9 kg
1.5.2 Receiver specifications
Type Receiver Single superhet
Frequency range 118.000 MHz . . . 136.975 MHz
Channels 760
Channel spacing 25 kHz
Sensitivity (mod. 1000 Hz/30%) ≤5µV emf for 6 dBS+N
N
Bandwidth ≥ ± 8 kHz at 6 dB down
Selectivity ≥40 dB at ±17 kHz
≥60 dB at ±25 kHz
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Squelch fixed in unit, defeatable with squelch switch
AGC characteristic from 5µV . . . 100 mV emf ≤6 dB
Undesired radiation ≤4 x 10-10watt
Distortion / m = 85% ≤10 %
Frequency response audio channel relative
to 1000 Hz / 0 dB ≤6 dB 350 Hz . . . 2500 Hz
≥18 dB at 5000 Hz
Intermediate frequency 21.4 MHz
Rated audio output
Speaker at 13.8 V operating voltage
≥2.5 watt into 4Ωtyp. 3 watt
at 10.0 V operating voltage
≥1.5 watt into 4Ω
Headphone at 13.8 V operating voltage
≥40 mW into 300 Ω
at 10.0 V operating voltage
≥30 mW into 300 Ω
Audio power output unregulated 100 mV/30% mod. Ri ≥10kΩ
Auxiliary input 1 V eff. / 600 Ω
1.5.3 Transmitter specifications
Transmitter output at 13.8 V operating voltage
≥5 watt
at 10.0 V operating voltage
(Emergency operation)
≥2 watt
Mode of modulation amplitude modulation A3E
Modulation depth ≥85%
≤100 % (dynamic compressing)
Input voltage for m = 85 % no overmoduIation at input voltages
dyn. mike ca. 2mV Dynamic-Compressor
Standard mike ca. 200 mV Dynamic-Compressor
Frequency deviation ≤0.002%
Undesired radiation ≤2.5 x 10 - 5 watts
Spurious emissions within the 108 - 117.95 MHz range ≤2 x 10 - 7 watts
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Frequency response ≤6 dB 350 Hz . . . 2500 Hz
Distortion / m = 85% / 1000 Hz ≤10%
m = 85% / 350 - 1000 Hz ≤20%
Carrier noise level ≥35 dB
1.5.4 Optional functions
Digital voltmeter (operating voltage indication) 7 V . . . 35 V DC ±0.1 V
Ditial thermometer - 20°C . . . +100°C
Temperature sensor Linear tolerance ±1,5°C
NOTE
The VHF transceiver is designed for the frequency range 118 to 137 MHz. The frequency
range between 136 MHz and 137 MHz may not be used for mobile aircraft radio
communications until after January 1990, in accordance with the relevant regulations.
1.6 Certification
FTZ certification LB 393/83
LBA certification 10.911/76
Specification
RTCA DO - 156
RTCA DO - 157
RTCA DO - 160A
EUROCAE ED 23 / ED 24 / ED 14A
Performance classification D1 / A/MNO/XXXXXXABABA
1.7 Accessories
The following connectors are necessary for connecting the transceiver without options :
1 Cable connector plug for transceiver Order No. 430.722-277
Antenna connector plug UG 88/U for transceiver Order No. 725.706-277
IC-Switch Order No. 213.055-278
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Whenthetransceiverincorporatesthetemperatureorvoltagemeasurementoption,thefollowing items
are required :
1 Cable connector complete Order No. 431.036-950
Detail parts
1 Cable connector plug for option Order No. 710.687-277
Temperature sensor - 65°C . . . 150°C Order No. 431.044-955
Bounceless pushbuttons Order No. 724.742-278
1.8 Scope of delivery
Screw block Order No. 472.875-203
Spring washer Order No. 213.126-213
1.9 Software
Frequency synthesizer, frequency storage and frequency display of the AR 3201 - ( ) are controlled
by a microprocessor. The software used has been categorized to Function Criticality Category
,,ESSENTIAL‘‘
accordirig to the guide,lines of RTCA DO - 178.
Uses elass was determined to be ,,CLASS X‘‘
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Table of contents
Section 2INSTALLATION Page
2.1 General 2-1
2.2 Pre-instailation check 2-1
2.2.1 General 2-1
2.2.2 Visual inspection 2-1
2.3 Mechanical installation 2-1
2.3.1 Mechanical installation VHF transceiver 2-1
2.3.2 Mechanical installation of a temperature sensor 2-1
2.4 Installation wiring 2-2
2.4.1 General 2-2
2.4.2 Microphone connection 2-2
2.4.3 Speaker/headphones connection 2-3
2.4.4 IC connection 2-3
2.4.5 Panel lighting 2-3
2.5 Auxiliary audio input (optional) (standard as of module No. 471) 2-4
2.6 Testing after installation 2-8
2.6.1 Ground testing with engine OFF 2-8
2.6.2 Ground testing with engine ON 2-8
Fig. 2-1 Jumpers location for charging the microphone input from dynamic to
standard microphone 2-3
Fig. 2-2 Panel connection 2-4
Fig. 2-3 Auxiliary audio input 2-4
Fig. 2-4 Dimensions of VHF transceiver 2-5
Fig. 2-5 Aircraft wiring 2-6
Fig. 2-6 Wiring diagram AR 3201 - ( ) with Speaker - Junction 2-7
Fig. 2-7 Location of IC control 2-8
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Section 2INSTALLATION
2.1 General
Installation of the VHF communication transceiver and the battery box depends on the type of aircraft
and equipment involved, the instructions given in this section thus being only generally applicable.
2.2 Pre-instailation check
2.2.1 General
Prior to fitting the new system in the aircraft, the units must be checked according to the following
procedure to establish whether they have been damaged in transit.
2.2.2 Visual inspection
Prior to commissioning the equipment, carry out a visual inspection to establish any of the following
deficiencies.
1. Soilage, dents, scratches, corrosion, broken fasteners, damaged paintwork on enclosures and
parts thereof.
2. Soilage and scratches on the nameplate, front panel and markings.
3. Soilage, bends or broken-off pins, cracked plug and socket inserts.
4. Soilage and mechanical damage to rotary switches, LCD elements, knobs and pushbutton.
2.3 Mechanical installation
2.3.1 Mechanical installation VHF transceiver
The VHF transceiver is designed for incorporating in an aircraft instrument panel in behind panel
installation. The circular cutout and the fastener holes must be drilled in accordance with the standard
for small size instruments. Location must be min. 30 cm away from the magnetic compass of the
aircraft to avoid the compass being affected by the transceiver. Dimensional requirements are shown
in Fig. 2-4. Four DUZ fasteners (supply) are used to secure the unit.
2.3.2 Mechanical installation of a temperature sensor
The VHF transceiver permits indication of temperatures in the range - 20° C to +100° C with the aid
of an integral measuring circuit and a connected remote temperature sensor. The latter is located in
accordancewiththeparticularrequirementsandlocalconditions.Thewiringcanbeseenfrom Fig. 2-5.
Only use shielded flexed leads, noting the color coding of the connecting cables. The red lead must
be connected to J 3101/8, the blue lead to J 3101/2. The shielding must be connected to pin 4 of
J 3101.
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The temperature measuring circuit in the VHF transceiver and the temperature sensor are calibrated
in the factory together for optimum temperature measuring accuracy. Should the device or the
temperature sensor develop a fault or should the transceiver need replacing, the device will need
recalibrating according to the instructions as given in Section 5, Item 5.7.
2.4 Installation wiring
2.4.1 General
Fig. 2-5 illustrates the installation wiring of the VHF transceiver. In wiring the VHF transceiver the
battery voltage feeder cable should be AWG 20.
NOTE
a) Only use airworthy cable, i.e. self-extinquishing in suitable AWG for power supply and the other
lines.
b) Pull rubber sleeves over the solder juctions on the instrument connector.
c) A 3 A fuse or circuit breaker must be incorporated in the power supply.
d) Prior to switching on the unit, carefully check the wiring, particularly making sure that +ve and -ve
are not confused.
CAUTION
The AR 3201 - ( ) is only protected against wrong polarity when a fuse is incorporated
in the power supply, i.e. so that the fuse blows, leaving the unit undamaged. If no fuse is
provided, the unit can be ruined. In this case, the unit is not covered by our guarantee.
Suitable type cable sets are available for aircraft wiring (contact manufacturer).
CAUTION
Never tie any aircraft wiring into the connecting lines. In addition, the connecting cable
must not be put down together with line carrying pulsed information (IFC’s, DME, XPR,
SLAVED GYRO) the same applying to autopilot supply and control lines.
2.4.2 Microphone connection
The VHF-transceiver features a microphone amplifier as standard which is compatible with both a
dynamic microphone and a standard microphone. Unless stated otherwise, the transceiver is set in
the factory for a dynamic microphone connection. By resoldering jumper Br 4001 on the audio module
the microphone input can be changed from a dynamic microphone to a standard microphone. This
jumper is accessible after unscrewing the case and removing the audio module. As of serial No. 86,
conversion from dynamic to standard microphone has been simplified, jumper 4401 then no longer
requiring resoldering but merely reconnecting, without requiring removal of the audio module.
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View showing components side of audio module
Fig. 2-1 Jumpers location for charging the microphone input from dynamic to standard microphone
2.4.3 Speaker/headphones connection
The audio output of the transceiver is compatible with a 4Ωspeaker or headphone with an impedance
of 300Ω- 600Ωor both in parallel without having to switch the transceiver over.
CAUTION
The magnetic field of the speaker will affect the compass, therefore, minimum spacing
between speaker and compass must be 1.3 m when selecting speaker location.
2.4.4 IC connection
The IC connection is provided for aircraft with high ambient noise and requires use of the headset
together with an IC switch in the unit connector for the additioning wiring (see aircraft wiring Fig. 2-4).
The normal communications position is the OFF position of the IC-switch, i.e. in the ON position
communications operation is the same as before, however, with intercommunication between the two
crew members without having to press the (PTT) button.
2.4.5 Panel lighting
The transceiver features a panel lighting circuit which must be connected to the + 14 V supplyvoltage
by connection P 4101/7 or to a dimmer control. It is good practice to provide the lighting externally via
a separate lighting switch to save current in aircraft having no power system, e.g. gliders.
CAUTION
The lighting is not switched off on operation of the ON/OFF switch.
Dyn. Mike
Standard Mike
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Fig. 2-2 Panel connection
2.5 Auxiliary audio input (optional) (standard as of module No. 471)
The auxiliary audio input permits audio input from other equipment in the aircraft. This input can only
be heard, however, in the RX mode. The possibility of circuiting two units together finds application in
aircraft having, for instance, only one transceiver and one NAV receiver. When using the auxiliary
audioinput,a680ΩresistormustbeswitchedtoGND.Whencircuitingunitstogether,100Ωdecoupling
resistors must be included (see following diagrams). Output of the audio listening amplifier requires
an audio input voltage of approx. 1 V/600Ω.
Fig. 2-3 Auxiliary audio input
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Fig. 2-4 Dimensions of VHF transceiver
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Fig. 2-5 Aircraft wiring
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