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.

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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

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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

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3-15 Dec. 15/95

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List of effective 1 Dec. 15/98 3-18 Dec. 15/98
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Table of contents 1 Dec. 15/95

Introduction 1 Dec. 15/95

General description 1-1 Dec. 15/95

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INSTALLATION AND OPERATION

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TABLE OF CONTENTS

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

INSTALLATION AND OPERATION

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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".

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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

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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.

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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.

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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

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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)

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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

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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

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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)

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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

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

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Table of contents

INSTALLATION Page

1. General 2-1

2. Testing before installation 2-1

3. Mechanical installation 2-1

4. Installation wiring 2-2

5. Testing after installation 2-8

Fig. 2-1 Interwiring panel lighting 2-3
Fig. 2-2 Internal automatic cut-out 2-4
Fig. 2-3 Mounting dimensions VHF transceiver 2-5
Fig. 2-4 Interwiring of the VHF transceiver with dynamic mike 2-6
Fig. 2-5 Interwiring of the VHF transceiver with standard mike 2-7
Fig. 2-6 Interwiring AR 4201 - ( ) with speaker junction 2-8

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INSTALLATION

1. General
The installation of the VHF transceiver depends on the type of aircraft and its

equipment. Therefore, only general information can be given in this Section.

2. Testing before installation
A. General

Before installing the VHF transceiver in an aircraft, inspect the unit for signs
of transport damage.

B. Visual examination

Before commissioning, visually examine the unit paying particular attention
to the following defects :

(1) Dirt, dents, scratches, corrosion or broken attaching parts, damaged

paintwork on housing, parts of the housing and panel.

(2) Dirt or scratches on the identification plate, front panel, LCD or

inscriptions.

(3) Dirt, bent or broken pins, displaced inserts of plugs and sockets.

(4) Dirt and mechanical damage to pushswitches and operating knobs.

3. Mechanical installation
A. Mechanical installation of VHF transceiver.

The VHF transceiver is designed for installation in the instrument panel of an
aircraft. It is constructed for mounting behind the panel. The circular cutout
and the mounting holes are to be drilled in accordance with the small instru­ment size. The mounting point shall be at least 30 cm from the aircraft ma ­gnetic compass, to avoid any interference to the magnetic compass by the
Transceiver. The necessary dimensions are given in Fig. 2-3. Attachment is
by means of four screws, which are included in the delivery.

B. Mechanical installation of a temperature sensor

The VHF transceiver enables temperatures in the -20°C to +55°C range to be
displayed, with the aid of the fitted measuring device and the connection of
an external temperature sensor. The location of the mounting of the tempera­ture sensor depends on the particular purpose and local conditions. The wi­ring diagram is shown in Fig. 2-4. A twisted, screened cable should be used.

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4. Installation wiring
A. General

The installation wiring diagrams are shown in Fig. 2-4 - 2-6.

NOTES :

(1) Use only cable which is fit for use in aircraft (self extinguishing).

AWG 20 for power supply and AWG 22 for other cables.

(2) Fit rubber sleeves over the solder joints on the equipment connector.

(3) Protect the power supply with a 5 A fuse or circuit breaker.

NOTE : The VHF transceiver is protected internally by a 5 A automatic
cut-out.

(4) Type-specific cable harnesses are also available for the aircraft wiring

(details from manufacturing works).

(5) No HF cables should be included in the cable harnesses of the system

and the routing of connecting cables alongside cables which carry audio
power or pulses should also be avoided.

(6) Carefully check the wiring before switching on the unit and check

particularly that (+) and (-) have not been reversed.

B. Microphone connection

The VHF transceiver enables a maximum of two dynamic microphones and
two standard microphones (d.c. supply) to be connected at the same time. A
symmetrical input transformer with an impedance of 150 Ohm is fitted at the
input of the dynamic microphone.

Note:The dynamic mike input sensitivity can be changed in the service

mode (SF16).

Note: When the STD mike input is used, we strongly recommend to set the

sensitivity of the dynamic mike input to zero using SF16 of the service
mode. This measure will prevent disturbances from the dynamic input.

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C. Speaker connection

A 4 to 8 Ohm speaker can be connected to audio output P1- 1AF-asym.

CAUTION : The magnetic field of a speaker influences the magnetic compass.

When choosing the mounting point, a minimum distance of 1.3 m
must be maintained between the speaker and the magnetic com­pass.

D. Headphone connection

Up to two headphones with an impedance of 600 Ohm can be connected to
the audio output P1 - 2,3 AF-HI/LO.

E. Intercom mode "IC connection".

The intercom mode is designed for aircraft with a high noise level and assu­mes operation using headsets. Additional wiring on the equipment connector
with an IC switch is necessary (refer to Fig. 2-4 - 2-6).
The normal R/T communication takes place with the IC switch in the OFF po ­sition. When the IC switch is set to ON, R/T communication can be carried
on as before but intercommunication is also possible between two crew mem­bers. The IC is switched off during transmission.

F. Panel lighting

The VHF transceiver is fitted with panel lighting. It is to be connected to
the aircraft external power supply via the aircraft wiring at terminal
P1 23(+)/10(-) or to a dimmer control (refer to the following illustration). For
aircraft without an external power supply, the lighting power should be supp­lied via a separate lighting switch to save power.

CAUTION : The lighting is not switched off when the unit is switched off

(ON/OFF switch).

Fig. 2-1 Interwiring panel lighting

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G. "Auxiliary" audio input

The AF-AUX (P1/4) auxiliary audio input enables the switching of audio si­gnals from other equipment in the aircraft. The switched-in audio signals
can, however, only be monitored in the reception mode. The facility to switch
two units together will be used particularly in those aircraft which are fitted
with an Transceiver and an NAV receiver. An audio input voltage of 1 to 8 V,
600 Ohm is necessary for modulation of the audio audio amplifier (can be ad­justed in the "Service" mode).

H. Internal automatic cut-out

The released automatic cut-out is reactivated by mean of a suitable object.

Fig. 2-2 Internal automatic cut-out

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Fig. 2-3 Mounting dimensions VHF transceiver

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Fig. 2-4 Interwiring of the VHF transceiver with dynamic mike

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Fig. 2-5 Interwiring of the VHF transceiver with standard mike

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Fig. 2-6 Interwiring AR 4201 - ( ) with speaker junction

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5. Testing after installation
A. Ground test with engine shut down.

(1) After installation of the unit, measure the antenna tuning between the

base of the antenna and the antenna connecting cable using a VHF
reflection-coefficient meter (voltage standing wave meter).

(2) The VSWR (voltage standing wave ratio) over the complete frequency

range of the unit shall be within 3:1. If this matching value is incorrect,
this indicates a mismatch, caused for example by an incorrect or unsatis­factory counterpoise, a cable with an impedance which deviates signifi­cantly from 50 Ohm or an incorrectly tuned antenna.

(3) After the antenna measurement, check the readability by carrying out a

speech test with a ground station.

B. Ground test with engine running.

(1) With the engine running at cruising speed check that the aircraft power
supply is within the permissible tolerances at approximately 14 V.

(2) When performing the succeeding speech test, ensure that the distance
from the ground station is as great as possible, at least 100 m. With the engi­ne at cruising speed, the cabin noise of the aircraft should be only slightly
transmitted and communication should be clear and distinct. Hold the micro ­phone close to the lips when speaking.

(3) Switch on the aircraft intercom using the IC switch (if fitted) and carry out
a speech test with the engine running at cruising speed. If necessary, adjust
the IC volume (refer to the service mode in the operating instructions (secti­on 3)).

(4) Switch on the squelch switch and check the squelch function. The point at
which the squelch operates is set in the service mode (refer to operating in ­structions, section 3).

(5) The sidetone volume can be adapted to the cabine noise in the aircraft. If
necessary, adjust the sidetone volume (refer to the service mode in the ope ­rating instructions (section 3)). When using the loudspeaker, the sidetone
should be adjust so that no acoustic feedback occurs.

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Table of contents

OPERATION Page

1. Controls and indicators 3-1

2. Meaning of symbols on controls and indicators 3-1

3. Operating instructions 3-3

4. Safety instructions 3-19

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OPE RA TI ON

1. Con trols and in di ca tors

2. Mea ning of sym bols on con trols and in di ca tors
A. Con trols

Functi on key Se lec ti on of mode

Ex chan ge key Mode 1:

Ex chan ge of pre set fre quen cy
and ac ti ve fre quen cy.

Mode 3:
Swit ching bet ween tem pe ra tu re
and ope ra ting vol ta ge in di ca ti on.

Sto re key Sto ra ge of set fre quen cy or in

Mode 2 a chan ge bet ween the
chan nel se lec ti on mode and scan
mode.

Squelch key Swit ching the squelch on or off.

When the key is pres sed, the
bot tom line in di ca ted ON or OFF

Fre quen cy se lec tor Swit ching the in di ca ted
switch fre quen cy in 1 MHz (ou ter ro ta ry

switch) steps or the sto ra ge
chan nel up wards or downwards in
steps of 10.

Fre quen cy se lec tor Swit ches the in di ca ted (in ner ro ta-

ry switch switch) fre quen cy in 25
kHz steps or the sto ra ge chan nel
by 1 step in each case up wards or
downwards, wit hout car ry over.

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ON/OFF switch, com bi ned Ad just ment of vo lu me
with vo lu me con trol

B. LCD (li quid crys tal dis play) ele ments

(top line) In di ca ti on of ac ti ve trans mis si on/

re cep ti on fre quen cy (ac ti ve fre­quen cy).

(top line) Trans mis si on in di ca ti on (trans mis-

sion but ton is pres sed).

(bot tom line) In di ca ti on of pre set trans mis si on/

re cep ti on fre quen cy (pre set fre­quen cy).

(bot tom line) CH in di ca ti on stea dy : in di ca tes

the sto ra ge chan nel.

(bot tom line) CH in di ca ti on flas hes :

if the in itia ted sto ra ge ope ra ti on is
not com ple ted by pres sing the
sto re key.

(bot tom line) In di ca ti on that the se lec ted sto ra-

ge chan nel is not oc cu pied.

(bot tom line) In di ca ti on of tem pe ra tu re in

°Cel si us or
°Fah ren heit

In di ca ti on of supp ly vol ta ge.

In di ca ting seg ment flas hes.
Supp ly vol ta ge ≤ 10.5 V

(bot tom line) In di ca ti on of scan functi on

(bot tom line) In di ca ti on ON
(bot tom line) In di ca ti on OFF

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C. Rear of unit

BNC 50 Ohm an ten na con nec ting

so ckets

25-pin D sub mi nia tu re, Equip ment con nec tor for con nec­male ting the in stal la ti on wi ring

3. Ope ra ting in struc tions
A. Swit ching on the unit

CAU TI ON : Do not switch on the VHF trans cei ver when en gi nes are being

start ed or shut down.

(1) Switch on the VHF trans cei ver using the ON/OFF switch (ro ta te vo lu me

con trol clock wi se).

(2) The seg ments of the LC dis play will blink with the po wer supp ly vol ta ge

ha ving drop ped down to 9V d.c. Fol lo wing the blin king pe ri od the self-test
is con duc ted. With low supp ly vol ta ge this test pe ri od can last up to 20
se conds. If the test is po si ti ve, the trans cei ver au to ma ti cal ly swit ches to
the mode which was ac ti vat ed be fo re switch-off.

If the test re sult ne ga ti ve, the LCD will dis play the first fault re port for
ap pro xi ma te ly five se conds. If furt her faults were de tec ted du ring test,
the cor re spon ding fault re ports will be dis play ed ad di tio nal ly. Af ter is
play ing the last fault re port the equip ment will switch au to ma ti cal ly to the
ope ra ting mode which was ac ti vat ed be fo re switch-off.

(3) The fol lo wing fault sig nals are pos si ble :

E1 Pro ces sor de fec ti ve
E2 Syn the si zer fai led
E3 Fault in EE-PROM
E4 Con trol ler (PIC) au dio as sem bly de fec ti ve

(4) The va ri ous mo des are com pre hen si ve ly des cri bed, tog het her with the

set ting of the equip ment con fi gu ra ti on in the ser vi ce mode, in the An nex
to the Ge ne ral Ope ra ting In struc tions.

B. Trans mit/re cei ve mode

(1) Set the fre quen cy of the lo cal ground sta ti on in the pre set dis play and

press the ex chan ge key. Ro ta te the VOL con trol to the cen tre po si ti on.

NOTE : If the er ror mes sa ge E2 ap pe ars in the top line du ring ope-

ra ti on, the syn the si zer is not lat ching and furt her R/T
ope ra tions no lon ger pos si ble. The VHF trans cei ver must
be check in the next ser vi ce sta ti on

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(2) Ope ra te the trans mit but ton and call the ground sta ti on. Hold the mi cro-

pho ne clo se to the lips for op ti mum speech trans mis si on.

NOTE : The ar row in the top line of the dis play in di ca tes trans mit

mode. Du ring trans mis si on a pro tec ti ve cir cuit pre vents a
fre quen cy chan ge or fre quen cy chan nel chan ge even if the
fre quen cy se lec tor switch is ro ta ted. The key ing functions
on the con trol pa nel are also in hi bi ted.

(3) Set the cor rect re cep ti on vo lu me using the VOL con trol whilst the ground

sta ti on is ans we ring.

(4) Switch on the squelch (press SQL key again). Weak re cep ti on

sig nals and re cep ti on noi ses are sup pres sed. The switch-on thres hold of
the squelch can be set in the ser vi ce mode.

NOTE : When chan ging the mode or the fre quen cies

(PRESET- AC TI VE fre quen cy) the chan ge is au to ma ti cal ly
sto red 2 se cond af ter the last chan ge took pla ce. Due to
this de lay chan ges which were made im me di ate ly be fo re
swit ching off the trans cei ver will not be me mo ri zed. Ex ce pe-

ti ti on: Me mo ry ac tions as sto ra ge by pres sing the STO key.

C. Ope ra ti on of in ter com mode

(1) Switch on the IC switch (ex ter nal).

(2) Ope ra te the in ter com mu ni ca ti on (IC).

(3) If ne ces sa ry, the IC vo lu me can be ad jus ted to the noi se le vel of the air-

craft (for ad just ment re fer to ser vi ce mode).

D. Au dio au xi lia ry in put

A se cond and third ra dio unit (na vi ga ti on re cei ver) can be mo ni to red si mul ta ne ­ous ly via the au dio au xi lia ry in put. Du ring trans mis si on the au xi lia ry in put is
swit ched off from the au dio end am pli fier. If ne ces sa ry, the in put sen si ti vi ty
can be mat ched to the noi se le vel of the air craft (for set ting re fer to ser vi ce
mode).

IN STAL LA TI ON AND OPE RA TI ON

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E. Jam ming of trans mit but ton

(1) The VHF- trans cei ver is fit ted with a pro tec ti ve cir cuit to pro tect against

jam ming of the trans mit but ton or a short cir cuit on the key supp ly line.

For con ti nu ous trans mis sions ex cee ding two mi nu tes the pro tec ti ve cir-

cuit au to ma ti cal ly swit ches from trans mis si on to re cep ti on. This avoids

the swit ched chan nel being blo cked.

(2) It is pos si ble to ac ti va te the trans mit ter again im me di ate ly by re-pressing

the trans mit but ton. In the event of a fault, this is only pos si ble af ter the
short cir cuit has been clea red or the trans mit but ton re lea sed.

CAU TI ON : In Stock to be able to con ti nue trans mit ting even with the

trans mit but ton jam med, the VHF Trans cei ver must be
swit ched off and then back on again. Af ter that the VHF
trans cei ver then con ti nu es to ope ra te in the trans mit mode
for a furt her two mi nu tes.

F. Flas hing of the LCD

(1) If the po wer supp ly for the VHF trans cei ver drops be low 10.5 V, the dis-

play be gins to flash. This flas hing in di ca tes, when ope ra ting on bat te ries
for ex am ple, that the bat te ries re qui re re char ging. In prac ti ce the dis play
be gins to flash in the trans mit mode be cau se this is when the po wer
con sump ti on is grea test. If the po wer supp ly again in crea ses abo ve

10.5 V, the flas hing cea ses.

(2) Be cau se the disch ar ge cur ves of the bat te ries are very de pen dant on the

type of bat te ry, e.g. lead or ni ckel/cad mi um ac cu mu la tors, and the am
bient tem pe ra tu re also in flu en ces the disch ar ge cur ves, it is not pos si ble
to sta te pre ci se ly how long the VHF trans cei ver con ti nu es to be ful ly
functio nal af ter the LCD be gins to flash.

(3) When trans mit ting, the bat te ries can be com ple te ly disch ar ged af ter a
few trans mis si on cy cles but du ring re cep ti on functio ning is still gua ran-

teed in most ca ses for ap pro xi ma te ly 1 to 2 hours af ter the flas hing be­gins. At 10 V supp ly vol ta ge the unit still con ti nu es to functi on at
re du ced trans mis si on po wer.

G. Ope ra ti on of the va ri ous mo des

(1) The VHF trans cei ver per forms va ri ous functions which are co ver ed by

in di vi du al ope ra ting mo des. The mode is se lec ted by brief ly pres sing the
MDE key. If it is pres sed for a long time (more than 1 se cond) this se­lects mode 1.

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(a) Mo des:

1 Stan dard mode (dis play of ac ti ve and pre set fre quen cy),

set ting the pre set fre quen cy and sto ring fre quen cies in the
sto ra ge chan nels.

2 Dis play of the sto ra ge fre quen cies in the sto ra ge chan nels or

cal ling up the scan functi on.

3 Dis play of tem pe ra tu re (op ti on), po wer supp ly vol ta ge and

ac ti ve fre quen cy

4 Ser vi ce mode, for set ting the equip ment con fi gu ra ti on.

NOTE : When chan ging the mode or the fre quen cies (PRE SET-

AC TI VE fre quen cy) the chan ge is au to ma ti cal ly sto red 2

se cond af ter the last chan ge took pla ce. Due to this de lay
chan ges which we re made im me di ate ly be fo re swit ching off
the trans cei ver will not be me mo ri zed. Ex cep ti on: Me mo ry
ac tions as sto ra ge by pres sing the STO key.

(2) Mode 1 (stan dard mode)

(a) The last dis play ed ac ti ve and pre set fre quen cies ap pe ar in the LCD

dis play.

(b) The pre set fre quen cy (bot tom line) is set using the MHz and kHz

fre quen cy se lec tor swit ches.

(c) When the ex chan ge key is pres sed, a chan ge from the ac ti ve to the

pre set fre quen cy oc curs. A furt her ope ra ti on of the key can cels the
fre quen cy chan ge.

Sto ra ge ope ra ti on

(d) Pres sing the STO key.

The ac ti ve fre quen cy re mains dis play ed in the top line.The
VHF trans cei ver is rea dy to trans mit and re cei ve on this fre quen cy.
The pre set fre quen cy ap pe ars flas hing in the bot tom line.
The re qui red fre quen cy can be set using the kHz fre quen cy se lec tor
(steps of 1) or the MHz fre quen cy se lec tor (steps of 10).
Pres sing the STO key.
The next free chan nel is shown flas hing “ch”. Press the STO key.
The se lec ted fre quen cy is sto red in the free spea ker chan nel and
the sto ra ge pro cess is en ded. A no me mo ry chan nel is free, the

hig hest as sign me mo ry chan nel is se lec ted au to ma ti cal ly.

IN STAL LA TI ON AND OPE RA TI ON

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or

se lect the chan nel to be over writ ten using the kHz fre quen cy se lec tor and
press the STO key. This me ans that this chan nel will be over writ ten with
the new fre quen cy and the sto ra ge pro cess en ded.

Note

If no in put ta kes pla ce wit hin ap pro xi ma te ly se ven se conds, the VHF
trans cei ver swit ches to the pre vi ous ly set mode.

Lea ving the mode
To lea ve the mode, press the MDE key.

(3) Mode 2 (dis play of fi xed fre quen cies in the va ri ous chan nels)

(a) Chan nel se lec ti on mode

NOTE : If in mode 2 the scan functi on is swit ched on in the ser-

vice mode, no sto ra ge ope ra ti on can be ac ti vat ed in this
mode.

1 Se lect mode 2 using the MDE key. The last in di ca ted sto ra ge

chan nel ap pe ars in the bot tom line of the LCD and the sto red
fre quen cy is shown in the top line. The VHF trans cei ver is
rea dy to trans mit and re cei ve on this fre quen cy.

2 Se lect re qui red chan nel using the kHz fre quen cy se lec tor

(steps of 1) or the MHz fre quen cy se lec tor (steps of 10).
Free chan nel (no fre quen cy sto red) will be skip ped when
se lec ted.

3 If the Scan functi on is not ac ti vat ed, the sto ring functi on can

be in itia ted by pres sing the STO-Key. Re fer to des crip ti on of
mode 1.

Note The top line in di ca tes the ac ti ve fre quen cy. The ac ti ve

fre quen cy in di ca ted in the bot tom line is flas hing. Se lect
the de si red fre quen cy can be set using the kHz fre quen­cy se lec tor or the MHz fre quen cy se lec tor.

4 Exit from mode 2 is achie ved by pres sing the MDE key.

IN STAL LA TI ON AND OPE RA TI ON

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(b) Scan functi on

Note: When ope ra ting the scan mode ob ser ve the re gu la tions

for the avia ti on ra dio ser vi ce

1 If the scan functi on is ac ti vat ed in the equip ment con fi gu ra ti-

on, pres sing the STO key chan ges from the chan nel se lec ti on
mode to the scan functi on. In the scan functi on, the fre quen cy
ap pe ars in the top line of the dis play and the as so cia ted chan­nel with the pre set CS is shown in the bot tom line.

2 In the scan functi on, eit her all the oc cu pied sto ra ge chan nels

or a re qui red ran ge of sto ra ge chan nels can be scan ned. The
scan ning ran ge is spe ci fied in the ser vi ce mode. The va ri ous
sto ra ge chan nels are scan ned in 200 ms in ter vals. If the mi­cro pro ces sor finds a car rier in one of the chan nels, it holds a
short on this chan nel and checks whet her an eva lua tab le
sig nal is pre sent. If no eva lua tab le sig nal is pre sent, it swit­ches to the next chan nel and then re verts to the 400 ms in ter­vals (mil li se conds ran ge). In the event of an eva lua tab le re­cep ti on sig nal being re cei ved the VHF trans cei ver re mains on

the sto ra ge chan nel un til an eva lua tab le re cep ti on sig nal is no

lon ger pre sent.Af ter a hold time 0 to 60 se conds (can be set
in the ser vi ce mode) the scan ning of the sto ra ge chan nels at
200 ms in ter vals be gins again. The set squelch le vel is the
cri te ri um for an eva lua tab le re cep ti on sig nal, re gard less of
whet her the squelch is ac ti vat ed or not.

3 The VHF trans cei ver is equip ped with chan nel prio ri ty. This

functi on can be swit ched ON or OFF in ser vi ce mode SF 18

NOTE: If an ade qua te sig nal is re qui red on the prio ri ty chan nel
with op ti on chan nel prio ri ty swit ched ON, the VHF trans cei-

ver au to ma ti cal ly lea ves the SCAN mode and is rea dy for
trans mis si on and re cei ve on this chan nel. For re turn to the

SCAN mode, again press the STO key.

4 The scan functi on is ter mi na ted by pres sing the STO key. The

VHF trans cei ver then be gins to ope ra te again in the chan nel
se lec ti on mode - the CS in the bot tom line goes out and CH
ap pe ars. Exit from mode 2 is ac com plis hed in the same way
as des cri bed in the chan nel se lec ti on mode.

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(4) Mode 3 In di ca ti on of supp ly vol ta ge or tem pe ra tu re (op ti on)

When the ex chan ge key is pres sed, a chan ge from the supp ly vol ta ­ge and tem pe ra tu re in di ca ti on oc curs.

NOTE : If no tem pe ra tu re sen sor is con nec ted, this mode is skip-

ped when the ex chan ge key is pres sed.

(a) The supp ly vol ta ge and tem pe ra tu re is con ti nu ous ly mea su red.

In di ca ti on oc curs only in mode 3. The mode is se lec ted by brief ly
pres sing the MDE key once or se ve ral ti mes (cor re spon ding to the
pre vi ous sta te) the ac ti ve fre quen cy on which the VHF trans cei ver
is rea dy for ope ra ti on is shown in the top line and the mea su red
vol ta ge/tem pe ra tu re is dis play ed in the bot tom line. The dis play
in °C or °F can be set in the ser vi ce mode.

(b) The ac ti ve fre quen cy (top line) can be chan ged using both fre quen-

cy se lec tor swit ches. A sto ra ge ope ra ti on is ac ti vat ed using the

STO key. This pro ce du re is des cri bed in mode 1.

(c) To exit mode 3 it is ne ces sa ry to press the MDE key.

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(5) Ser vi ce mode (equip ment con fi gu ra tions)

The ser vi ce mode is me ant to en ab le the ground tech ni ci ans to set the
equip ment con fi gu ra ti on and must not be used in flight.

(a) The fol lo wing set tings can be chan ged or set:

SqL Set ting the switch-on thres hold of the squelch
SIdE Set ting the si de to ne vo lu me
aU Set ting the au dio au xi lia ry vo lu me
IC Set ting the IC vo lu me
SF5 Ca li bra ting the tem pe ra tu re sen sor
SF6 Set ting the ad dres sa ble sto ra ge lo ca tions
SF7 Set ting the tem pe ra tu re dis play in °C or °F
SF8 Swit ching on the scan functi on
SF9 Set ting the hold time af ter com ple ti on of a call in the

scan mode
SF10 Re lea se the fre quen cy set ting (chan nel se lec ti on only)
SF11 Re lea se the fre quen cy sto ra ge
SF12 Era su re of sto red fre quen cies
SF13 Set ting the “chan nel start” of the scan ning ran ge
SF14 Set ting the “chan nel end” of the scan ning ran ge
COdE En te ring a pass word to in ter lock the equip ment

con fi gu ra ti on.
SF16 Dy na mic mike in put sen si ti vi ty
SF17 In hi bi ting the trans mit mode for one or more me mo ry
chan nel
SF18 Chan nel prio ri ty ON/OFF switch (op ti on)
FSqL No functi on
SF20 Spea ker mu ting switch ON/OFF
SF21 In crea se the au dio po wer out put

- . - In di ca ti on the soft wa re ver si on and chan ge sta tus

NOTE : The equip ment con fi gu ra ti on SqL, SIdE, AU, IC and
SF16 set tings gi ven in the ser vi ce mode are set by the
fac to ry as ba sic set tings using stan dard va lu es. If re ver-

sion to the stan dard va lu es is re qui red, the por tab le VHF

Trans cei ver must be swit ched off and swit ched on again

si mul ta ne ous ly pres sing the STO and MDE keys. This

does not over wri te the pass word.

If no tem pe ra tu re sen sor is con nec ted, the mode SF5
and SF 7 is skip ped when the mode key is pres sed.

If the SF8 scan functi on is not ac ti vat ed, than the func-

tion SF9, SF13 and SF14 will not be dis play ed.

The set tings SF 17 and SF 18 are op tio nen. When the

op tio nen are not ac ti vat ed, the mode SF17 and

SF 18 is skip ped when the mode key is pres sed.

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(b) Cal ling up the ser vi ce mode

Switch off the VHF trans cei ver. Hold the mode key (MDE)
pres sed and at the same time switch on the unit. The VHF
trans cei ver swit ches to the ser vi ce mode wit hout a unit test.
SqL ap pe ars in the top line and the switch on thres hold of
the squelch is shown on the bot tom line.

NO TES :

l The set tings are se lec ted in steps by brief ly pres sing the MDE key

in the ser vi ce mode. If the MDE key is pres sed at the end of the set ­ting, the set ting SqL then ap pe ars. If a di rect re turn to the SqL set ­ting is re qui red the MDE key must be pres sed for at least one se ­cond.

l If set tings are not ac ti vat ed, (e.g. scan functi on) this mode is skip -

ped by pres sing the mode key.

l In the ser vi ce mode the VHF trans cei ver ope ra tes in de pen dent ly of

the set tings on the con trol pa nel, on the fre quen cy which was last
set as the ac ti ve fre quen cy. Wenn the PTT-Key is pres sed in the
ser vi ce mode, the dis play in di ca tes in the top line the ac ti ve fre ­quen cy

l The user can in ter lock his equip ment con fi gu ra ti on set tings with

the aid of a pass word. The VHF trans cei ver is de li ver ed from the
fac to ry wit hout a pass word. Sec ti on COdE “En try of pass word for
in ter loc king the equip ment con fi gu ra ti on” des cri bes how to en ter a
pass word.

1 Set ting the squelch thres hold

a If functi on SqL is cal led up, the fol lo wing dis plays ap pe ar.

Top line SqL
Bot tom line 00 to 200 Stan dard va lue 130

(HI sen si ti vi ty LO)

b By me ans of the kHz switch, the squelch thres hold can be

al te red up wards or downwards in steps of 5. The set va­lue is sto red by pres sing the STO key.

IN STAL LA TI ON AND OPE RA TI ON

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2 Set ting the si de to ne le vel

a Call up the SIdE functi on using the MDE key. The fol lo-

wing dis plays ap pe ar.
Top line SIdE
Bot tom line 00 to 63 Stan dard va lue 32

(LO le vel HI)

b Using the kHz switch, The si de to ne le vel can be al te red
up wards or downwards. The set va lue is sto red by pres-

sing the STO key.
Up warts se ri al No.: 1500 Press the PTT key and set the

cor rect si de to ne vo lu me using the kHz switch. The si de-

tone le vel can be al te red up wards or downwards. The set
va lue is sto red by pres sing the STO key.

3 Set ting the au dio au xi lia ry le vel

a Call up the AU functi on using the MDE key. The fol lo-

wing dis plays ap pe ar.
Top line AU
Bot tom line 00 to 63 Stan dard va lue 63

(LO le vel HI)

b Using the kHz switch, al ter the au dio au xi lia ry le vel up-

wards or downwards. The set va lue is sto red by pres sing
the STO key.

4 Set ting the IC le vel

a Call up the IC functi on using the MDE key. The fol lo-

wing dis plays ap pe ar :
Top line IC
Bot tom line 00 to 63 Stan dard va lue 32

(LO le vel HI)

b The IC le vel can be chan ged up wards or downwards
using the kHz switch. The set va lue is sto red by pres sing

the STO key.

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5 Ca li bra ting the tem pe ra tu re sen sor

a If no tem pe ra tu re sen sor is con nec ted, this mode is skip-

ped when the mode key is pres sed.

b Ca li brat ion is only ne ces sa ry if the sen sor has been re tro-

spec ti ve ly fit ted or re pla ced.

c Af ter cal ling up using the MDE key, the fol lo wing dis play

ap pe ars.
Top line SF 5
Bot tom line Mea su red tem pe ra tu re

d Mea su re the am bient air tem pe ra tur of the sen sor by me-

ans of a suit ab le ther mo me ter and set tem pe ra tur dis play
on the LCD. To this mea su red va lue by mean of the kHz
fre quen cy se lec tor. The en try is sto red by pres sing the
STO key and of the tem pe ra tu re sen sor is ca li brat ed .

6 Set ting ad dres sa ble sto ra ge lo ca tions 1 to 99.

a Call up the functi on using the MDE key. The fol lo wing

dis play then ap pe ars.

Top line SF 6

Bot tom line 1 to 99
b The num ber of the sto ra ge chan nel bet ween 1 to 99 can

be se lec ted as re qui red using the kHz switch and sto red

by pres sing the STO key. If the num ber of sto ra ge chan-

nels is li mit ed and if chan nels out si de the li mit ed area

have al rea dy been used, the se can no lon ger be cal led

up. The data in the chan nels out si de the area con ti nu es

to re main sto red and it can be re-used at any time by

lif ting the re stric ted area.

7 Set ting the tem pe ra tu re dis play in the °C or °F.

a If no tem pe ra tu re sen sor is con nec ted, this mode is skip-

ped when the mode key is pres sed.
b Call up functi on SF 7 using the MDE key. The fol lo wing

dis plays ap pe ar :

Top line SF 7

Bot tom line °C of °F
c The re qui red dis play is se lec ted using the kHz switch and

the se lec ti on is sto red by pres sing the STO key.

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8 Swit ching on the scan functi on

a If the SF8 scan functi on is not ac ti vat ed, than the functi on

SF9, SF13 and SF14 will not be dis play ed.

b Call up functi on SF 8 using the MDE key. The fol lo wing

dis play ap pe ars.
Top line SF 8
Bot tom line OFF or On

c Se lect the re qui red functi on using the kHz switch and

sto re the se lec ti on by pres sing the STO key.
OFF = scan functi on off
On = scan functi on on

9 Set ting the hold time in the scan functi on (only dis play ed, if

SF8 is ac ti vat ed).
a Call up functi on SF 9 using MDE key. The fol lo wing dis-

plays ap pe ar :
Top line SF 9
Bot tom line 0 .0 to 60.0

b The hold time can be set as re qui red bet ween 0,0 ..0,9

se conds using the kHz se le tor switch and bet ween 0..60
se conds using the MHz se lec tor switch. The set va lue is
sto red by pres sing the STO key.

10 In hi bi ting the fre quen cy set ting (chan nel se lec ti on only).

a Call up functi on SF 10 using the MDE key. The fol lo wing

dis plays ap pe ar :
Top line SF 10
Bot tom line OFF or On

b Se lect the re qui red functi on using the kHz key and sto re

the functi on by pres sing the STO key.
OFF= Fre quen cy set ting not pos si ble. The VHF trans cei-

ver can only work on the fre quen cies sto red in the in di vi­dual chan nels.
On = Fre quen cy set ting pos si ble (stan dard set ting).

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11 In hi bi ting the fre quen cy sto ra ge

a Call up functi on SF 11 using the MDE key. The fol lo wing

dis play ap pe ars.

Top line SF 11

Bot tom line OFF or On
b Se lect the re qui red functi on using the kHz switch and

sto re the se lec ti on by pres sing the STO key.

OFF = The sto ra ge of fre quen cies in the in di vi du al chan-

nels is not pos si ble. The VHF trans cei ver can only
work on the set fre quen cy.

On = Sto ra ge of fre quen cies in the in di vi du al chan nels
is pos si ble (stan dard set ting)

12 Era se sto red fre quen cies

a Call up functi on SF 12 using the MDE key. The fol lo wing

dis play ap pe ars.

Top line SF 12

Bot tom line CH chan nel num ber
b Se lect the chan nel to be era sed using the kHz (steps of

1) or MHz (steps of 10) switch. The sto red fre quen cy is
era sed by pres sing the STO key.

13 Set ting the “chan nel start” scan ning ran ge (only dis play ed, if

SF8 is ac ti vat ed).
a Call up functi on SF 13 using the MDE key. The fol lo wing

dis plays ap pe ar :

Top line SF 13

Bot tom line CS chan nel num ber
b Se lect the star ting chan nel, using the kHz (steps of 1) or

MHz (steps of 10) switch, at which the scan functi on is to

be gin. The star ting chan nel is sto red by pres sing the STO

key.

Note
When this functi on is set OFF, the ac ti ve and pre set fre -

quen cies which were set last re mains are avai la ble in
Mode 1

IN STAL LA TI ON AND OPE RA TI ON

AR 4201 - ( )

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14 Set ting the “chan nel end” scan ning ran ge.(only dis play ed, if

SF8 is ac ti vat ed).
a Call up functi on SF 14 using the MDE key. The fol lo wing

dis plays ap pe ar :
Top line SF 14
Bot tom line CS chan nel num ber

b Using the kHz (steps of 1) or MHz (steps of 10) switch,

se lect the end chan nel at which the scan functi on is to
stop. Sto re the end chan nel by pres sing the STO key.

15 En try of pass word to in ter lock the equip ment con fi gu ra ti on.

a Call up the COdE functi on using the MDE key. The fol lo-

wing dis play ap pe ars.
Top line COdE 15
Bot tom line 0

b Set any 4-digit nu me ri cal code using the kHz (steps of 1)

or MHz (steps of 10) switch. Sto re the nu me ri cal code by
pres sing the STO key.

NOTE : As soon as a pass word is gi ven an 0 ap pe ars

in the bot tom line when the ser vi ce mode is
cal led up. The nu me ri cal code must then be
in put using the MHz or kHz switch. If the VHF
trans cei ver de tects a fal se nu me ri cal code, it
au to ma ti cal ly swit ches to the last mode.
If the pass word is to be era sed or chan ged,
this is done by cal ling up the ser vi ce mode
using the old pass word. The COdE functi on
is then cho sen and eit her an 0 is en te red
everyw he re or the chan ged nu me ri cal code
is en te red.

16 Set ting the dy na mic mike in put sen si ti vi ty

a Call up functi on SF 16 using the MDE key. The fol lo wing

dis plays ap pe ars :
Top line SF 16
Bot tom line 00 bis 63 Stan dard va lue 32

(LO sen si ti vi ty HI)

b The dy na mic mike in put sen si ti vi ty can be chan ged

up wards or down-wards using the kHz switch. The set
va lue is sto red by pres sing the STO key.

IN STAL LA TI ON AND OPE RA TI ON

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17 In hi bi ting the trans mit mode for one or more me mo ry chan nel

(op ti on)
a Call up functi on SF 17 using the MDE key. The fol lo wing

dis plays ap pe ars :

Top line SF 17

Bot tom line CS chan nel num ber
b Using the kHz (steps of 1) or MHz (steps of 10) switch,

se lect the de si red chan nel for in hi bi ting the trans mit
mode. Sto re the chan nel by pres sing the STO key. Se ve-

ral chan nels can be se lec ted on prio ri ty chan nels. The let

ter T ap pe ars in the bot tom line be fo re CS. When the
STO key is pres sed again, the in hi bi ting trans mit mode is

can ce led. The let ter T is not ap pe ars in the bot tom line

be fo re CS.

18 Chan nel prio ri ty ON/OFF switch (Op ti on)

a Call up functi on SF 18 using the MDE key. The fol lo wing

dis plays ap pe ars :

Top line SF 18

Bot tom line CS chan nel num ber
b Using the kHz (steps of 1) or MHz (steps of 10) switch,

se lect the de si red chan nel. Sto re the chan nel by pres-

sing the STO key. Se ve ral chan nels can be se lec ted on
prio ri ty chan nels.

19 FSqL no functi on

20 Spea ker mu ting switch ON/OFF

a Call up functi on using the MDE key. The fol lo wing

dis plays ap pe ars :

Top line SF20

Bot tom line OFF or On

OFF = Spea ker mu ting on

On = Spea ker al ways swit ched on
b Se lect the functi on using the kHz switch. Sto re the

re qui red functi on by pres sing the STO key. This se lec ti on

be co mes ac ti ve af ter en ding the ser vi ce mode.

IN STAL LA TI ON AND OPE RA TI ON

AR 4201 - ( )

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21 In crea se the au dio po wer out put

a Call up functi on using the MDE key. The fol lo wing

dis plays ap pe ars :
Top line SF21
Bot tom line OFF or On
OFF = Stan dard au dio po wer out put

On = ma xi mum au dio po wer out put

b Se lect the functi on using the kHz switch. Sto re the

re qui red functi on by pres sing the STO key. This se lec ti on
is ac ti ve im me di ate ly by pres sing the STO key.

22 In di ca ti on the soft wa re spec. no.: and chan ge sta tus

a Call up functi on using the MDE key. The fol lo wing

dis plays ap pe ar.
Top line soft wa re spec. no.: and chan ge

sta tus Mi cro pro ces sor

Bot tom line soft wa re spec. no.: and chan ge sta tus

CO-Miroprocessor (PIC)

23 Ba sic set tings in the ser vi ce mode

The vo lu me set tings gi ven in the ser vi ce mode are set by the
fac to ry as ba sic set tings using stan dard va lu es. If re ver si on to
the stan dard va lu es is re qui red, the VHF trans cei ver must be
swit ched off and swit ched on again by si mul ta ne ous ly pres sing
the STO and MDE keys.

24 En ding of the ser vi ce mode

The VHF trans cei ver must be swit ched off to end the ser vi ce
mode.

IN STAL LA TI ON AND OPE RA TI ON

AR 4201 - ( )

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4. Sa fe ty in struc tions
The fol lo wing in struc tions must be fol lo wed for safe ope ra ti on of the VHF trans cei -

ver:

A. Switch off the unit when star ting or shut ting down en gi nes.

B. A speech test is to be per for med be fo re start up and it should be no ted that if

the speech test is car ried out clo se to the ground sta ti on the re sults may be
po si ti ve even if the an ten na ca ble is bro ken or short-circuited. At a dis tan ce
of 5 to 10 km no con nec ti on will be made.

C. Use a loud voi ce for speech com mu ni ca ti on and hold the mi cro pho ne clo se to

the lips. Ot her wi se ca bin noi se can be in tru si ve and make un der stan ding dif fi­cult.

D. Use only mi cro pho nes or he ad sets which are suit ab le for use in air craft. In air-

craft made of wood or syn the tic ma te ri als or in gli ders or he li cop ters, in co ming
ra di ati on on the equip ment an ten na can af fect the in te gra ted am pli fier of the
mi cro pho ne (feed back). This is no ti ce ab le in the ground sta ti on by whist ling
and/or he avy dis tor ti on. The des cri bed dis tur ban ces can oc cur in dif fe rent ways
on the dif fe rent trans mis si on chan nels.

E. Trans mit but tons can stick and cau se con ti nu ous trans mis si on. The re fo re, when

trans mit ting en su re that the ar row in the top line on the left next to the ac ti ve
fre quen cy dis play dis ap pe ars when the trans mis si on but ton is re lea sed.

IN STAL LA TI ON AND OPE RA TI ON

AR 4201 - ( )

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IN STAL LA TI ON AND OPE RA TI ON

AR 4201 - ( )

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