Becker AR 4201 Installation And Operation Manual

VHF Transceiver

AR 4201 - ( )

INSTALLATION AND OPERATION

Serial No.: 1000 upwards

Issue 1 15 December 1995

Revision 1 22. May 1996

Revision 2 15 December 1998

Baden Airpark • B 108

D-77836 Rheinmünster Phone [phone]

E-Mail [e-mail] or [e-mail]

23-10-01 December 15/98

SERVICE BULLETIN LIST

SERVICE

BULLET.

NO.

MOD.

STATE

IDENT.

INSERTEDBYDATE SERVICE

BULLET.

NO.

MOD.

STATE

IDENT.

INSERTEDBYDATE

INSTALLATION AND OPERATION

AR 4201 - ( )

SBL Page 1

23-10-01 December 15/95

RECORD OF REVISIONS

REV.

NO.

ISSUE

DATE

INSERTED REV.

NO.

ISSUE

DATE

INSERTED

DATE BY DATE BY

1
1
1

15.12.95

22.05.96

15.12.98

1000
1500
4900

1
2

INSTALLATION AND OPERATION

AR 4201 - ( )

ROR Page 1

23-10-01 December 15/98

LIST OF EFFECTIVE PAGES

SUBJECT PAGE DATE SUBJECT PAGE DATE

Titel page Dec. 15/98 3- 9 Dec. 15/95

3-10 Dec. 15/98

Service bulletin list 1 Dec. 15/95 3-11 Dec. 15/95

3-12 DEC.15/98

Record of revisions 1 Dec. 15/98 3-13 Dec. 15/95

3-14 Dec. 15/95

3-15 Dec. 15/95

3-16 Dec. 15/95

3-17 Dec. 15/95
List of effective 1 Dec. 15/98 3-18 Dec. 15/98
page 2 Dec. 15/98 3-19 Dec. 15/95

3-20 Dec. 15/95

Table of contents 1 Dec. 15/95

Introduction 1 Dec. 15/95

General description 1-1 Dec. 15/95

1-2 Dec. 15/95
1-3 Dec. 15/95
1-4 Dec. 15/95
1-5 Dec. 15/95
1-6 Dec. 15/95
1-7 Dec. 15/95
1-8 Dec. 15/95
1-9 Dec. 15/95
1-10 blank

Installation 2-1 Dec. 15/95

2-2 Dec. 15/95
2-3 Dec. 15/95
2-4 Dec. 15/95
2-5 Dec. 15/95
2-6 Dec. 15/95
2-7 Dec. 15/95
2-8 Dec. 15/95
2-9 May. 22/96
2-10 Dec. 15/95

Operation 3-1 Dec. 15/95

3-2 Dec. 15/95
3-3 Dec. 15/98
3-4 Dec. 15/98
3-5 Dec. 15/95
3-6 Dec. 15/95
3-7 Dec. 15/95
3-8 Dec. 15/95

INSTALLATION AND OPERATION

AR 4201 - ( )

LEP Page 1

23-10-01 December 15/98

TABLE OF CONTENTS

Page
INTRODUCTION 1
GENERAL DESCRIPTION 1-1
INSTALLATION 2-1
OPERATION 3-1

INSTALLATION AND OPERATION

AR 4201 - ( )

TOC Page 1

23-10-01 December 15/95

INTRODUCTION

1. General

This manual describes the AR 4201 - ( ) VHF transceiver upwarts serial number

1000.

2. Manufacturer

The VHF transceiver was developed and manufactured, and is serviced, by

Becker Flugfunkwerk GmbH
Airport
P.O. Box 34
D-76549 Hügelsheim

Germany
Telephon: [phone] / 305-0

Telefax: [phone] / 305-217

3. Layout of manual

The manual is divided into seven sections. Section 1 contains the general descrip­tion of the VHF transceiver and gives the technical data. Section 2 describes the
installation instructions and Section 3 the operation of the unit.

4. Revisions to the manual

All the incorporated revisions to the manual are listed in sequence on the front
page "Record of Revisions".

INSTALLATION AND OPERATION

AR 4201 - ( )

INTRO Page 1

23-10-01 December 15/95

Table of contents

General description Page

1. Purpose of equipment 1-1

2. General description 1-1

3. Technical data 1-3

4. Software 1-5

5. Approval 1-5

6. Environmental Qualification Form 1-6

7. Accessories 1-7

8. Scope of delivery 1-8

Fig. 1-1 Standard accessories AR 4201 - ( ) 1-9

INSTALLATION AND OPERATION

AR 4201 - ( )

Page I-I

23-10-01 December 15/95

GENERAL DESCRIPTION

1. Purpose of equipment

The VHF transceiver enables voice communication on 760 channels in the

118.000 MHz to 136.975 MHz range with a channel spacing of 25 kHz. The VHF
transceiver is designed with sufficient mechanical strength to enable it to be fitted
in an aircraft without any limitations. There is no restriction within the verified envi ­ronmental classes on fitting in the instrument panel, or fixed mounting in the fuse ­lage, of all types of aircraft including helicopter.

2. General description

A. The VHF transceiver has been developed as a single block unit. The dimen-

sions correspond to the standard instrument diameter of 58 mm (2 1/4 inches).
Mounting is by means of four screws (rear panel mounting). All controls and indi­cators are located on the front panel. The rear of the unit holds the equipment
connector and the antenna socket.

B. After it is switched on, the unit performs a self test. All segments of the display

flash during the self test. If faults are detected, the LCD (liquid crystal display)
displays a fault code for approximately five seconds. The VHF transceiver then
automatically activates the mode set before it was switched off.

C. The VHF transceiver is fitted with a single superheterodyne receiver. A squelch

(muting) circuit suppresses transmitters or disturbances below a certain field
strength. The switching threshold can be set. The squelch function can also be
switched off.

D. The transmitter is designed to be wideband over the 118.000 MHz to

136.975 MHz range. The transmitter output power is ≥ 5 Watt. The sidetone is
automatically switched to the headphone output during transmission.

E. The oscillator frequency of the receiver and the the transmitting frequency of

the transmitter are generated by a VCO (voltage controlled oscillator). This is
monitored by a digital frequency evaluation circuit. This digital frequency
processing operates in conjunction with a microprocessor.

F. The microphone inputs are designed for both dynamic and standard microphones.

The inputs are connected to a dynamic volume compressor which keeps the
modulation voltage constant over a wide input voltage range.

G. The frequency indication is by means of a liquid crystal display (LCD). The

required operating frequency is set using the MHz and kHz frequency selector
switches. The MHz rotary switch engages at 1 MHz steps and the kHz rotary
switch at 25 kHz steps. The VHF transceiver also contains a memory device
for storing 99 different frequencies which remain stored even with the unit
switched off without an auxiliary battery.

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-1

23-10-01 December 15/95

H. The VHF transceiver also contains a monitoring stage for the supply voltage

which is activated when the VHF transceiver is switched on. If the supply
voltage drops below 10.5 V, the segments of the LCD begin to flash.

I. In the mode 3, the supply voltage and temperature is displayed in the bottom

line of the LCD.

J. Aircraft internal communication is possible in the IC (intercom) mode. Activation

is by means of an external IC button (or switch) which is to be connected to the
equipment connector.

K. The AF auxiliary input enables AF signal switching of auxiliary units in the air-

craft. The switched AF signals can, however, only be monitored in the reception
mode.

L. If illumination of the LCD is required, this can be connected either directly to the

supply voltage or via a dimmer.

M. The scan function can be switched on in the service mode and called up in

mode 2. The active frequency is shown in the top line of the display and the
bottom line shows the associated storage channel with the preset CS. In the
scanning mode the stored frequencies in the storage channels are scanned in
succession at 200 ms intervals. When an evaluatable reception signal is found,
the VHF transceiver remains on this frequency until an evaluatable reception
frequency is no longer present. It then begins to scan all the stored frequencies
again in 200 ms intervals. In the service mode, the hold time between the end
of an evaluatable signal and the continuation of the scanning of the next chan­nels can be set to between 0 and 60 seconds.

N. Special functions

VHF transceiver contains some special functions which can be set in the
service mode.

l Adjustment of volume IC, sidetone, AF auxiliary and the sensitivity of dy-

namic microphone.

l The switch-on threshold of the squelch can be set in the service mode.
l The frequency setting can be inhibited. The VHF transceiver then opera-

tes only on the frequencies stored in the storage channels.

l The storage of frequencies in the storage channels can be inhibited.
l Stored frequencies can be erased.
l Access to the service mode can be interlocked with a 4-digit password.
l The scan function can be switched on.

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-2

23-10-01 December 15/95

O. Options

(1) In the mode 3, a temperature in °C or °F can be measu-

red via a temperature sensor which can be externally connected, and this
temperature is displayed in the bottom line of the LCD. The choice bet­ween °C and °F is made in the service mode.

3. Technical data

A. General data

Nominal supply voltage 13.75 V.d.c.
Supply voltage range 12.4 V to 15.1 V

Emergency operation (10.0 V) Good intercom
Power consumption at 13.75 V

without panel lighting
"Standby" reception mode ≤ 70 mA

Reception mode ≤ 500 mA
Transmission mode ≤ 2.5 A

Panel lighting 13.8 V.d.c/40 mA
Frequency range 118.000 MHz to 136.975 MHz
Number of channels 760
Channel spacing 25 kHz
Storage temperature range -55°C to +85°C
Operating temperature range as per

EUROCAE/RTCA ED-14C/DO-160C -20°C to +55°C

short-time +70°C

Operating altitude as per
EUROCAE/RTCA ED-14C/DO-160C 50 000 ft

Vibration as per
EUROCAE/RTCA ED-14C/DO-160C Cat. NM

Humidity as per
EUROCAE/RTCA ED-14C/DO-160C Cat. A/+50°C: 95%, 48 h

Dimensions
Front panel 60.6 mm x 60.6 mm

Depth of unit without
cable connector 192 mm

Weight 0.67 kg
internal Fuse 5 A

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-3

23-10-01 December 15/95

B. Receiver data

Type of receiver Single superhetrodyne receiver
Sensitivity ≤ 5 µV EMF for 6 dB = SINAD

(mod. 1000 Hz/30%)
IF bandwidth ≥ ± 8 kHz at 6 dB attenuation
Selectivity ≥ 40 dB at ± 17 kHz

≥ 60 dB at ± 25 kHz
Squelch Can be adjusted and switched off
AGC characteristic for

5 µV to 100 mV EMF ≤ 6 dB
Distortion m = 85% ≤ 15%
Audio frequency response ≤ 6 dB 350 Hz to 2500 Hz

relative to 1000 Hz ≥ 18 dB at 4000 Hz
Intermediate frequency 21.4 MHz
Rated output
for speaker operation at 13.75 V nominal operating

voltage ≥ 3 W at 4 Ω

at 10.0 V operating voltage

(emergency mode) ≥ 1.5 W at 4 Ω
with headset connected at 13.75 V nominal operating

voltage ≥ 100 mW at 600 Ω

at 10.0 V operating voltage

(emergency mode) ≥ 30 mW at 600 Ω
Audio auxiliary input 1 V to 8 V at 600 Ω ± 10%

adjustable
(regardless of volume)

C. Transmitter data

Transmitter output at 50 Ω ≥ 5 W
at 10.0 V operating voltage ≥ 2 W

(emergency mode)
Frequency tolerance ≤ 15 ppm
Duty cycle 1:4 (Min)
Type of modulation A3E amplitude modulation
Modulation factor ≥ 70% to ≤ 99% (dynamic

compressor)

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-4

23-10-01 December 15/95

Distortion at 70% modulation ≤ 15%
Modulation bandwidth 350 Hz to 2500 Hz
Frequency response -6 dB (relative to 1 kHz/0 dB)
Input voltage (m = 70%)
Dynamic microphone typ. 2 mV symmetrical 150 Ω

(dynamic compressor)

Standard microphone typ. 100 mV 100 Ω

(dynamic compressor)

FM deviation with modulation
m = 70% f = 1.25 kHz ≤ 3 kHz

Sidetone true, adjustable
Automatic shutdown on short after 2 mins of continuous

circuit of transmit button transmission, the transmitter

shuts down. Activated by releasing
the transmit button and re-pressing.

D. Additional functions

Digital voltmeter
(Supply voltage display) 7 V to 15 V d.c. ± 0.1 V

Digital thermometer with
external sensor (option) -20°C to + 55°C

4. Software
The frequency processing, frequency storage and frequency display of the

AR 4201 - ( ) are controlled by microprocessors. The software was classified as
Category "ESSENTIAL" Level 2 in agreement with the EUROCAE/RTCA Document
ED12A/DO-178A.

5. Approval
Regulations

JTSO - 2C37d, ED-23A, Equipment Class 4
JTSO - 2C38d, ED-23A, Equipment Class C
EUROCAE/RTCA ED-14C/DO-160C
EUROCAE/RTCA ED-12A/DO-178A
FTZ 17T R2010

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-5

23-10-01 December 15/95

6. Environmental Qualification Form
The following performance standards under environmental test conditions have

been established in accordance with the procedures set forth in EUROCAE/RTCA
Document No. ED-14C/DO-160C.

Environmental condition ED - 14C

DO - 160C

Category Performance

Temperature 4.0 D1
Low operating

temperature

4.5.1 - 20° C

Low ground survival
(storage temperatur)

- 55° C

High short-time opera­ting temperature

4.5.2 70° C

High operating
temperature

4.5.3 + 55° C

High ground survival
(storage) temperature

85° C

Min. operating pressure
(equivalent altitude)

4.6.1 50.000 ft.

Temperature variation 5.0 B
Humidity 6.0 A 48 hrs at up to 50° C and

95% relative humidity
Shock : 7.0
Operational shocks 7.2 11 ms at 6 G for all three

dimensional axes
Crash safety shocks 7.3 11 ms at 15 G for all three

dimensional axes
Vibration 8.0 MN
Magnetic effect 15.0 Z Deflection of 1° of compass at

a distance of ≥ 30 cm
Power input variation 16.0 B The equipment functions on a

10-volt emergency power

supply
Resistance to voltage

spikes on equipment
power leads

17.0 A

Audio-frequency
conducted susceptibility

18.0 B

Susceptibility to induced
magnetic and electric •
fields at 400 Hz

19.0 A

Radio-frequency
interference
susceptibility

20.0 T

Spurious RF emissions 21.0 A

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-6

23-10-01 December 15/95

7. Accessories
Unit connection
Cable socket Stock No. 725.021.277

Connector housing Stock No. 775.479-277
Antenna plug Stock No. 725.706-277

Antennas
VHF rod antenna with

BNC connector 1A001 Stock No. 267-007.952
VHF-COMM bonded antenna 1A005
for GRP aircraft Stock No. 358.762-952

Transmit button
Control column switch with 1.5 m long

connecting cable US070 Stock No. 431.011-950
Control column switch, 10 mm, US 509 Stock No. 481.556-278

Microphones
Swan neck microphone, PM004 Stock No. 267.163-951

Microphone socket, 5-pin 1SB039 Stock No. 724.939-277
Headset and speaker
Speaker 4 Ohm, 4 W without

housing, 12 cm dia. Stock No. 710.733.353
Speaker and housing, 4 Ohm, 4 W Stock No. 759.643-951
Headset, dynamic microphone Stock No. 860.557-951
230 Ohm headphone, 550 Ohm (parallel)
with diode plug, 180 1PH028

Jack 3-pin PJ 68 1SB006 Stock No. 724.661-277
Jack 2-pin PJ 55 1SB004 Stock No. 724.645-277

IC switch
IC switch with 1US071 connecting cable Stock No. 431.028-950
1PL042 speaker junction Stock No. 879.312-951
AR4201-() cable set If a cable set is used,

a cable socket and connector housing
are not necessary 1K042 Stock No. 877.476-950

AR 3201-()/AR 4201-() adaptor 1AD042 Stock No. 877.522-950
Temperature sensor 1K043 Stock No. 878.170-278
Connector set 1SS042 Stock No. 879.304-954
Manual Installation and Operation Stock No. 894.036-071
Manual Maintenance and Repair Stock No. 894.044-071

(Components maintenance manual)

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-7

23-10-01 December 15/95

8. Scope of delivery

AR 4201-() VHF transceiver Stock No. 868.541-910
4 screws Stock No. 868.590-203
Operating instructions Stock No. 877.689-071

INSTALLATION AND OPERATION

AR 4201 - ( )

Page 1-8

23-10-01 December 15/95