Becker Designed AR 3201 User Manual

VHF-Transceiver

AR 3201 - ( )

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 [e-mail]

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

AR 3201 - ( )

Table of contents

Section 1 GENERAL 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

DV 28110.03/.04 Issue 04/92 1-I

AR 3201 - ( )

Blank

1-II DV 28110.03/.04 Issue 04/92

AR 3201 - ( )

Section 1 GENERAL 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

1 General Information X X

2 Installation X X

3 Operation X X

4 Theory of Operation X

5 Maintenance and Repair X

6 Illustrated Parts List X

7 Modification and Changes X

8 Circuit 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

DV 28110.03/.04 Issue 04/92 Page 1-1

AR 3201 - ( )

rigid fuselage mounting in all aircraft. The VHF transceiver is designed for compliance with RTCA and
EUROCAE airworthiness requirements.

1.3 General description

The VHF transceiver is designed as a single-block unit with dimensions in keeping with 58 mm diameter
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
a voltage-controlled oscillator (VCO) which is signalled by a digital frequencysynthesizer in conjunction
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 microp hone 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.

The frequency indication is a liquid crystal display ( LCD). The MHz and kHz frequency se lectors 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, eve n 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 wh en the
transceiver is switched off. In transceiver with serial No. fo 4000 or above, the channel frequency 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 automaticall y 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 channel A
appears, or one of four stored frequencies (depending on the position of the channel cel ector switch).
When the self-test function is activated, an arrow flashes on and off in addition to the digits 188.88
(⇐ 188.88).

Page 1-2 DV 28110.03/.04 Issue 04/92

AR 3201 - ( )

The transceiver also contains a stage for monitoring the aircraft supply voltage. This stag e 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 operate d 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 Fahrenheit or Celsius.

1.4 Variants survey

Table 1 -1 surveys the variants of transceiver AR 3201 - ( ). The various variants are not different 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.

DV 28110.03/.04 Issue 04/92 Page 1-3

Transceiver AR 3201-( )

AR 3201 - ( )

Drawing No./

Order No

28110-00000.000

389.528-910

28111 -00000.000

397.156-910

28112-00000.000

397.164-910

28113-00000.000

397.172-910

28114-00000.000

397.180-910

28120-00000.000

767.018-910

Type Voltage

measurement

AR 3201-( ) no no no yes

AR 3201-(1) yes yes no yes

AR 3201-(2) yes no yes yes

AR 3201-(3) no yes

AR 3201-(4) no no yes

AR 3201-(10) no no no yes

Tamperature

measurement

in deg Celsius

two different

temperatures

Temperature

measurement

in deg.

Fahrenheit

no yes

two different

temperatures

760

channel

yes

720

channel

28121 -00000.000

767.026-910

28122-00000.000

767.034-910

28123-00000.000

767.042-910

28124-00000.000

767.050-910

AR 3201-(11) yes yes no yes

AR 3201-(12) yes no yes yes

AR 3201-(13) no yes

two different

temperatures

AR 3201-(14) no no yes

no yes

yes

two different

temperatures

Table 1-1

Page 1-4 DV 28110.03/.04 Issue 04/92

AR 3201 - ( )

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 dB S+N

N

Bandwidth ≥ ± 8 kHz at 6 dB down

Selectivity ≥40 dB at ± 17 kHz

≥60 dB at ± 25 kHz

DV 28110.03/.04 Issue 04/92 Page 1-5