Thrane and Thrane A S 6222 User Manual

SAILOR 6222 VHF DSC
User manual
Document number: 98-131184-C Release date: June 20, 2011
Disclaimer
Any responsibility or liability for loss or damage in connection with the use of this product and the accompanying documentation is disclaimed by Thrane & Thrane. The information in this manual is provided for information purposes only, is subject to change without notice and may contain errors or inaccuracies.
Manuals issued by Thrane & Thrane are periodically revised and updated. Anyone relying on this information should acquire the most current version e.g. from
http://www.thrane.com or from the distributor.
Thrane & Thrane is not responsible for the content or accuracy of any translations or reproductions, in whole or in part, of this manual from any other source.
Copyright
© 2011 Thrane & Thrane A/S. All rights reserved.
Trademark Acknowledgements
Thrane & Thrane is a registered trademark of Thrane & Thrane A/S in the European
Union and the United States.
SAILOR is a registered trademarks of Thrane & Thrane A/S.
Other product and company names mentioned in this manual may be trademarks or trade names of their respective owners.
GPL notification
The software included in this product contains copyrighted software that is licensed under the GPL/LGPL. The verbatim licenses can be found online at:
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
You may obtain the complete corresponding source code from us for a period of three years after our last shipment of this product, which will be no earlier than December 31, 2015, by sending a money order or check for DKK 50 to:
SW Technology/GPL Compliance, Thrane & Thrane A/S, Lundtoftegaardsvej 93D 2800 Lyngby DENMARK
Please write "source for product SAILOR 6222 VHF DSC" in the memo line of your payment.
You may also find a copy of the source at http://www.thrane.com/foss. This offer is valid to anyone in receipt of this information.
Warranties
Any attempt to install or execute software not supplied by Thrane & Thrane on this device will result in the warranty being void. Any attempt to modify the software on this device in a way not specified by Thrane & Thrane will result in the warranty being void.

Safety warning 1

The following general safety precautions must be observed during all phases of operation, service and repair of this equipment. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture and intended use of the equipment. Thrane & Thrane assumes no liability for the customer's failure to comply with these requirements.
Ground the equipment
To minimise shock hazard, the SAILOR 6222 VHF DSC unit must be connected to an electrical ground and the cable instructions must be followed.
RF exposure hazards and instructions
Your Thrane & Thrane radio set generates electromagnetic RF (radio frequency) energy when transmitting. To ensure that you and those around you are not exposed to excessive amounts of energy and thus to avoid health hazards from excessive exposure to RF energy, all persons must be at least 200 cm away from the antenna when the radio is transmitting.
Warranty limitation
IMPORTANT - The radio is a sealed waterproof unit (classified IPX8). To create and maintain its waterproof integrity it was assembled in a controlled environment using special equipment. The radio is not a user maintainable unit, and under no circumstances should the unit be opened except by authorized personnel. Unauthorized opening of the unit will invalidate the warranty.
Installation and service
Installation and general service must be done by skilled service personnel.
Compass safe distance
Minimum safety distance: 0.85 m from the SAILOR 6222 VHF DSC.
iv
MM
MM
M
AA
AA
A
YY
YY
Y
DD
DD
D
AA
AA
A
YY
YY
Y
NANA
NANA
NA
MEME
MEME
ME of the
VV
VV
V
EE
EE
E
SS
SS
S
SS
SS
S
ELEL
ELEL
EL in distress
CC
CC
C
ALAL
ALAL
AL
LL
LL
L
SS
SS
S
IGNIGN
IGNIGN
IGN or other
IDENIDEN
IDENIDEN
IDEN
TT
TT
T
IFICIFIC
IFICIFIC
IFIC
AA
AA
A
TT
TT
T
IONION
IONION
ION
MM
MM
M
MM
MM
M
S
S
SS
S
II
II
I
(If the initial alert is sent by DSC)
PP
PP
P
OO
OO
O
SS
SS
S
ITIT
ITIT
IT
IONION
IONION
ION
given as
ll
ll
l
atat
atat
at
itit
itit
it
udeude
udeude
ude and
longitlongit
longitlongit
longit
udeude
udeude
ude
or
If latitude and longitude are not known
or if time is insufficient,
in relation to a known geographical location
NANA
NANA
NA
TURETURE
TURETURE
TURE of distress
Kind of
AA
AA
A
SS
SS
S
SS
SS
S
II
II
I
SS
SS
S
TT
TT
T
ANCANC
ANCANC
ANC
EE
EE
E required
Any other useful
INFINF
INFINF
INF
OROR
OROR
OR
MM
MM
M
AA
AA
A
TT
TT
T
IONION
IONION
ION
MM
MM
M
AA
AA
A
YY
YY
Y
DD
DD
D
AA
AA
A
YY
YY
Y
-M-M
-M-M
-M
AA
AA
A
YY
YY
Y
DD
DD
D
AA
AA
A
YY
YY
Y
-M-M
-M-M
-M
AA
AA
A
YY
YY
Y
DD
DD
D
AA
AA
A
YY
YY
Y
This is
NANA
NANA
NA
ME-NAME-NA
ME-NAME-NA
ME-NA
ME-NAME-NA
ME-NAME-NA
ME-NA
MEME
MEME
ME
CC
CC
C
ALAL
ALAL
AL
LL
LL
L
SS
SS
S
IGNIGN
IGNIGN
IGN
or other IDENTIFICATION
MM
MM
M
MM
MM
M
SS
SS
S
II
II
I
(If the initial alert is sent by DSC)
Use the
HANDHAND
HANDHAND
HAND
SS
SS
S
ETET
ETET
ET
for voice calling
LL
LL
L
ifif
ifif
if
t Ct C
t Ct C
t C
ovov
ovov
ov
erer
erer
er
PP
PP
P
rr
rr
r
ee
ee
e
ss
ss
s
s RED Buttons RED Button
s RED Buttons RED Button
s RED Button
until beep sounds continuously (more than 3 seconds)
SHIP‘s NAME:
CALLSIGN:
MMSI:
OWN OWN
OWN OWN
OWN
IDID
IDID
ID
99-132140
Press
VHF MF HF4 HF6 HF8 HF12 HF16
Channel 70
2187.5 kHz
4207.5 kHz
6312.0 kHz
8414.5 kHz
12577.0 kHz
16804.5 kHz
Channel 16
2182.0 kHz
4125.0 kHz
6215.0 kHz
8291.0 kHz
12290.0 kHz
16420.0 kHz
- - - - -
2174.5 kHz
4177.5 kHz
6268.0 k Hz
8376.5 kHz
12520.0 kHz
16695.0 kHz
DD
DD
D
SCSC
SCSC
SC
RR
RR
R
adiadi
adiadi
adi
otot
otot
ot
elephonelephon
elephonelephon
elephon
yy
yy
y
NBDPNBDP
NBDPNBDP
NBDP
DIDI
DIDI
DI
SS
SS
S
TRETRE
TRETRE
TRE
SS
SS
S
SS
SS
S
and C and C
and C and C
and C
OMOM
OMOM
OM
MM
MM
M
UNICUNIC
UNICUNIC
UNIC
AA
AA
A
TT
TT
T
IONION
IONION
ION
FREQUENCIEFREQUENCIE
FREQUENCIEFREQUENCIE
FREQUENCIE
SS
SS
S
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Remember to use the correct HF-procedures Don‘t forget your EPIRB is the secondary means of alerting
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Emergency calls
v

Preface 2

Radio for occupational use
The SAILOR 6222 VHF DSC fulfils the requirements of the Marine Equipment Directive 96/98/EC and the amending Directive 2002/75/EC and is intended for use in maritime environment.
SAILOR 6222 VHF DSC is designed for occupational use only and must be operated by licensed personnel only.
SAILOR 6222 VHF DSC is not intended for use in an uncontrolled environment by general public.
SAILOR 6222 VHF DSC is designed for installation by a skilled service person.
vi

Training information 3

The SAILOR 6222 VHF DSC is designed for occupational use only and is also classified as such. It must be operated by licensed personnel only. It must only be used in the course of employment by individuals aware of both the hazards as well as the way to minimize those hazards
The radio is thus NOT intended for use in an uncontrolled environment by general public. The SAILOR 6222 VHF DSC has been tested and complies with the FCC RF exposure limits for Occupational Use Only. The radio also complies with the following guidelines and standards regarding RF energy and electromagnetic energy levels including the recommended levels for human exposure:
FCC OET Bulletin 65 Supplement C, evaluating compliance with FCC guidelines for human exposure to radio frequency electromagnetic fields.
American National Standards Institute (C95.1) IEEE standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz
American National Standards Institute (C95.3) IEEE recommended practice for the measurement of potentially hazardous electromagnetic fields - RF and microwaves.
Below the RF exposure hazards and instructions in safe operation of the radio within the FCC RF exposure limits established for it are described.
Warning
Your Thrane & Thrane radio set generates electromagnetic RF (radio frequency) energy when it is transmitting. To ensure that you and those around you are not exposed to excessive amounts of that energy (beyond FCC allowable limits for occupational use) and thus to avoid health hazards from excessive exposure to RF energy, FCC OET bulletin 65 establishes an Maximum Permissible Exposure (MPE) radius of 200 cm for the maximum power of your radio (25W selected) with an half wave omni-directional antenna
vii
Installation
having a maximum gain of 4 dB. This means all persons must be at least 200 cm away from the antenna when the radio is transmitting.
1. An omni-directional antenna with a maximum power gain of 4 dB must be mounted at least 400 cm above the highest deck where people may be staying during radio transmissions. The distance is to be measured vertically from the lowest point of the antenna. This provides the minimum separation distance which is in compliance with RF exposure requirements and is based on the MPE radius of 200 cm plus the 200 cm height of an adult.
2. On vessels that cannot fulfil requirements in item 1, the antenna must be mounted so that its lowest point is at least 3 ft. (0.9m) vertically above the heads of people on deck and all persons must be outside the 200 cm MPE radius during radio transmission.
Always mount the antenna at least 200 cm from possible
human access.
Never touch the antenna when transmitting
Use only authorized T&T accessories.
viii
3. If the antenna has to be placed in public areas or near people with no awareness of the radio transmission, the antenna must be placed at a distance not less than 200 cm from possible human access.
Failure to observe any of these warnings may cause you or other people to exceed FCC RF exposure limits or create other dangerous conditions.
Manual overview
Important
This manual has the following chapters and appendices:
Introduction contains a description of the VHF radio.
Operation explains how to make and receive voice and DSC
Service & maintenance contains support information including
Appendix with Technical specifications and Maritime channels.
All installation information and instructions are not covered in this manual. Please download the SAILOR 6222 VHF DSC Installation manual (98-132904) at http://extranet.thrane.com/.
In the installation manual you can read how to mount the VHF radio and how to connect accessories and external equipment, including detailed system configuration examples with cable specifications.
Related documents
SAILOR 6222 VHF DSC, Installation guide 98-132281
calls over VHF, including how to use and set-up scanning, watch and replay.
lists of accessories and a troubleshooting guide.
Title and description Document number
SAILOR 6222 VHF DSC Installation manual
(download only)
SAILOR 6101 and 6103 Alarm Panel, Installation and user manual
Emergency call sheet 98-132369
98-132904
98-130981
ix
x
Table of Contents
Chapter 1 Introduction
VHF radio with DSC Class A ................................................ 1
Accessories available .........................................................4
Chapter 2 Operation
Overview ............................................................................9
General use and navigation ............................................. 10
VHF radio communication .................................................15
Watch ................................................................................19
Scan ..................................................................................19
DSC calls ..........................................................................20
Handling multiple calls — DSC and voice ..........................33
Phone book ......................................................................34
Replay function ................................................................ 37
Setup ...............................................................................38
Chapter 3 Service & maintenance
Contact for support ...........................................................47
Maintenance ....................................................................47
Troubleshooting guide .....................................................49
Warranty and returning units for repair ...........................55
App. A Technical specifications
Transceiver unit SAILOR 6222 VHF DSC .............................57
General DSC specifications ...............................................60
xi
Table of Contents
NMEA data rates and formats .......................................... 60
SAILOR 6090 Power Converter 24—12 V ............................. 61
App. B Maritime channels
International channels (INT) .............................................63
US channels .....................................................................64
CA channels .....................................................................65
BI channels ......................................................................66
Glossary .........................................................................................67
Index ........................................................................................ 69
xii
Chapter 1

Introduction

Introduction 1

VHF radio with DSC Class A

SAILOR 6222 VHF DSC, your new VHF radio with full DSC functionality, is approved to MED, FCC and Industry Canada and is waterproof to the IPx8 and IPx6 standard. As part of the required safety equipment, use the SAILOR 6222 VHF DSC in an emergency situation. However the best way to guarantee functionality in an emergency situation, is to use the radio in daily communication on board.
1111
The VHF radio is a simplex/semi duplex VHF radio. It is designed with an easy­to-use menu-driven setup. You use the soft-keys and the keypad to enter the desired functions, you browse and select a setting using the right selection knob. The large display can be customized for optimum readability and visibility both day and night with several color themes.
The VHF radio can replay the last 240 s of received voice messages. This is a useful feature to minimize misunderstandings and to record messages when the radio is unattended.
With SAILOR connection boxes the VHF radio connects easily to external equipment like additional handsets, water proof hand microphones, control speaker microphone, alarm panel or external speaker. The Ethernet interface enables the VHF radio to be connected to ThraneLINK for remote control and service updates.
For a list of accessories available for the VHF radio see Accessories available on page 4 and check with your nearest distributor.
1
Chapter 1: Introduction
5
6
7 8 9 10 11 12 13
1
2
3
4

Controls on the front plate

1. Loudspeaker.
2. Four soft keys with function title in the display.
3. Large display.
4. Keys 0 to 9 to enter numbers or text.
5. DW button to toggle the watch function (dual or triple).
6. 16/C quick selection key for channel 16 and the programmed call channel.
7. Connector for Handset or Handmicrophone.
8. Distress button for sending a Distress alert.
9. Squelch control to mute background noise.
10. Volume knob with key-press function for volume control and power on/off.
11. Selector and dim knob with key-press function for general operation, display color selection and dimming.
12. 1W button to toggle between high and low power.
13. Replay button to play back up to 240 s voice message.
2 VHF radio with DSC Class A
Chapter 1: Introduction
Introduction
5
6
4
CALL
ALERT
DROBOS
MORE
MMSI:123456789
INT
LO
DISTRESS/CALL
16
LAT: N 12°34.5678 LON:E 123°45.6789
(GPS)
22:07
RX
3
21
7

SAILOR 6222 VHF DSC display

The picture shows the display after start-up. The display holds various fields of information, depending on the currently selected function.
1. Functions you can select with
the soft keys. If there are more than 4 functions in the list press the soft key MORE to display further functions.
2. Current working channel.
3. System property icons with information relevant for the currently selected
functions.
4. Channel properties next to the currently selected VHF channel (if any).
1111
5. Service line containing current temporary information relevant for the
current channel or function.
6. Current state: RX or TX.
7. DSC window with DSC information (MMSI number, position information
and UTC time of position and origin), or specific information relevant to other functions, e.g. Replay, etc.).
For a detailed description of the information shown for each of the functions available see the chapter Operation on page 9.
VHF radio with DSC Class A 3
Chapter 1: Introduction

Accessories available

Accessory Description
SAILOR 6201 Handset with cradle (additional)
SAILOR 6203 Handset with cradle
SAILOR 6202 Hand Microphone
SAILOR 6204 Control Speaker Microphone
SAILOR 6207 Connection Box for parallel handsets
One SAILOR 6201 Handset with cradle is included in the delivery of the SAILOR 6222 VHF DSC. You can connect another 2 SAILOR 6201 Handsets.
SAILOR 6203 Handset with cradle, waterproof to IPx6.
You can use the SAILOR 6202 (waterproof to IPx6 and IPx8) Hand Microphone instead of the handset.
With the SAILOR 6204 Control Speaker Microphone you can control the VHF functions of the SAILOR 6222 VHF DSC.
The SAILOR 6207 Connection Box including Connection Cable 406209­941 is used for easy installation of several SAILOR 6201/03 Handsets.
4 Accessories available
Introduction
Accessory Description
1111
Chapter 1: Introduction
SAILOR 6208 Control Unit Connection Box
Connection cables
The SAILOR 6208 Connection Box including Connection Cable 406208­941 is used for easy installation of external equipment and accessories:
Max. 4 SAILOR 6204 Control Speaker Microphones
•VDR
•SAILOR6270 External loudspeaker
Alarm panels and GPS input
5m connection cable for bulkhead mount: Use this cable in installations where the SAILOR 6201 or 6203 Handset is not connected directly to the SAILOR 6222 VHF DSC, but located in a different position (part number: 406204-
940). 5m Connection cable, 1x10 pole: Use this cable in
installations when connecting external equipment to the SAILOR 6222 VHF DSC. This cable is included in the SAILOR 6207 Connection Box for parallel handsets (part number: 406207-941).
5 m Connection cable for SAILOR 6204 Control Speaker Microphone, 1x12 pole (part number: 406204-940).
SAILOR 6270 External loudspeaker
If you need an additional external loudspeaker you can connect a SAILOR 6270 Loudspeaker. It provides 6 W output power.
Accessories available 5
Chapter 1: Introduction
Accessory Description
SAILOR 6103 Multi Alarm Panel
SAILOR 6197 Ethernet Switch
SAILOR 6090 Power Converter 24 V to 12 V DC
With the SAILOR 6103 Multi Alarm Panel you can activate GMDSS Distress Alarms. The Multi Alarm Panel can be connected to the SAILOR 6222 VHF DSC via the Ethernet interface (LAN connector, ThraneLINK).
The SAILOR 6197 Ethernet Switch is used in installations with SAILOR 6103 GMDSS Alarm Panels and in installations with ThraneLINK. The Ethernet switch has 5 ports.
The SAILOR 6090 Power Converter is used to provide 12 V DC for the SAILOR 6222 VHF DSC from a 24 V DC power source.
6 Accessories available
Chapter 1: Introduction
Introduction
Speaker Microphone
Control
(NMEA)
GPS, AIS, etc.
Speaker (8 ohm)
External
SAILOR 6204
SAILOR 6201/03
Handset Option
SAILOR 6201/03
Remote Control + Service
ETHERNET port
99-128194-J
406209-940
Cable
406209-940
Cable
(without DSC)
LAN
12V DC
110/220V AC
Handset Option
Handset
SAILOR 6201/03
Handmicrophone
SAILOR 6202
Alarm
DSC Call
AUX
GPS
ACC. Port
VDR
Max 4 SAILOR 6204
Power Converter
SAILOR 6090
SAILOR 6208
Connection Box
Power
Power Supply
SAILOR N163S
SAILOR 6208
Connection Box
SAILOR 6207
Connection Box
for Parallel Handsets
406208-941
Cable
AUX. Port
CTRL. Port
406209-941
Cable
24V DC
VHF DSC
6222
Multi Alarm Panel
SAILOR 6103
12V Battery
24V DC
Aerial
RX/TX
Aerial
RX/DSC

System configuration — example

The SAILOR 6222 VHF DSC can be customized to suit your installation. The following illustration is one example of a system. For further configuration examples see the installation manual, Appendix B, System configurations.
1111
Accessories available 7
Chapter 1: Introduction
8 Accessories available
Chapter 2

Operation

Note
Operation 2
Before using the VHF radio make sure that the VHF and DSC antennas, power cable and other external equipment are connected properly. For installation instructions see the SAILOR 6222 VHF DSC Installation manual (download only).

Overview

In this chapter you find detailed instructions and guidelines for:
General use and navigation
VHF radio communication
Watch
Scan
DSC calls
Handling multiple calls — DSC and voice
Phone book
Replay function
Setup
2222
9
Chapter 2: Operation
Note

General use and navigation

Power on and volume in handset and speaker

The VHF radio has a dual-function on/off knob for power on/off and volume control.
To power on the VHF radio press the on/off knob.
To power off the VHF radio, press and hold the on/off knob and follow the instructions in the display.
To adjust the speaker volume, turn the volume knob (clockwise = louder, counter clockwise = softer, until muted). When muted, is shown in the display.
To adjust the volume of the handset earpiece see Radio setup on page 39.

Working channel and changing settings

Use the selector knob to browse and select:
To browse and select settings, turn the selector knob and press for accept.
To select a working channel use the selector knob or enter the channel number using the keypad. You can change channels whenever the channel designator is displayed.
A single, short press on the 16/C key always brings you to channel 16, the international calling and distress channel, no matter what state the radio is in.
10 General use and navigation
Chapter 2: Operation
Operation
Important

Speaker devices

The VHF radio can be equipped with the following speaker devices:
SAILOR 6201/6203 Handset with cradle and PTT (Push To Talk) button.
SAILOR 6202 Hand Microphone with PTT button.
SAILOR 6204 Control Speaker Microphone with PTT button. See Controller setup on page 45 for controlling the connected speaker devices.

DSC and MMSI number

The MMSI is a unique, 9-digit identifier assigned to your ship. When the VHF radio is powered on for the first time, the vessel’s MMSI number is programmed in the radio. This is typically done during installation of the radio and described in the installation manual.
The MMSI number must be programmed into the VHF radio to use any DSC functionality. The radio will prompt for the MMSI number at each power-up until the MMSI has been entered. You can use the radio in normal VHF mode.
2222
Caution! Without a programmed MMSI number the
Distress button will not work!
General use and navigation 11
Chapter 2: Operation
CALL
ALERT
DROBOS
MORE
MMSI:123456789
INT
INTERSHIP/PORT
10
LAT: N 12°34.5678 LON:E 123°45.6789
(GPS)
22:07

Position and MMSI number

The position and MMSI number for the SAILOR 6222 VHF DSC radio is always shown in the DSC window (the lower half of the radio’s display) in stand-by mode. The display shows also the current (latest) position (if a GPS is connected), the UTC and position type and GPS Status.
Enter position manually (no GPS)
If you need to enter the vessel’s position and UTC of position manually, do as follows:
1. Press the soft key SETUP. If it is not in the display, press the soft key MORE until SETUP appears.
2. Press the arrow soft key or to advance to DSC SETUP.
3. Press the selector knob to select Position & MMSI.
4. Enter the current position and UTC time:
Latitude (LAT),
Longitude (LON)
UTC time (POS UTC) Turn and press the selector knob to select the value you want to change.
Then use the keypad or press and turn the selector knob to enter the current values for position and UTC time. You can clear all position data by pressing CLEAR.
5. Having entered the UTC time, the soft key SAVE appears. Press SAVE and then EXIT to return to normal operation. The display shows Man in the lower right corner.
6. After you have entered a value manually or overruled the GPS input, a soft key UseGPS appears in the display if the GPS is available. Press this soft key if you decide to use the data from the connected GPS.
12 General use and navigation
Chapter 2: Operation
Operation
CALL
ALERT
DROBOS
MORE
MMSI:123456789
INT
DISTRESS/CALL
16
LAT: N 12°34.5678 LON:E 123°45.6789
(GPS)
22:07
If the GPS was present and then disappears a warning appears in the display after 10 minutes, then you can enter the position and UTC time manually as described above.

Soft-key functions

A number of functions of the SAILOR 6222 VHF DSC are accessed and set using the four soft keys to the left of the display. The current function of a soft key is shown in the display next to the soft key.
The following soft-key functions are available from top-level standby:
Soft key Function
CALL To make DSC non-distress calls
ALERT To make a distress call with assigned category
2222
DROBOS Make a distress relay call on behalf of someone else
SCAN Scanning menu with start, stop and tag function
PHBOOK Phone book
LOCAL Local mode, 10 dB attenuation
SETUP Setup pages for Radio setup, Channel setup, Power Supply,
DSC setup, DSC call logs, System setup and Controller setup.
Use the soft key MORE to display further soft key functions.
General use and navigation 13
Chapter 2: Operation
CALL
ALERT
DROBOS
MORE
MMSI:123456789
INT
DISTRESS/CALL
16
LAT: N 12°34.5678 LON:E 123°45.6789
(GPS)
22:07
Alternative colour theme

Changing the display light, night view

Red text on black background is available for optimal night vision. To dim the display backlight, e.g. to give comfortable night vision, press, hold
and turn the selector knob anti-clockwise. The display shows a brightness bar. At the brightness value 45 the display changes to night view with red text on black background.
To return to day vision press, hold and turn the selector knob clockwise until the display changes and it reaches the desired brightness.
The radio has two colour themes: Black text on a white background (default) or white text on black background. To change the color theme see System setup on page 44.

Adjusting the squelch level

With the Squelch control you can manually adjust and suppress noise in order to optimize the quality of the received radio communication.
When hearing noise or an unwanted signal, turn the squelch button clockwise until the speaker is muted.
14 General use and navigation
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