Sepura SCG22 Series User manual

Mobile Radio Full Installation Guide
SCG22 Series Transceiver

Original Instructions: ENGLISH
Document Number: SPR-DOC-04384
Issue 1.0_W
Copyright
© Sepura Limited 2002–2020
All rights reserved. This document is intended for the use of Sepura Limited
customers and/or other parties only for the purposes of the agreement or
arrangement under which this document is submitted, and no part of it may
be reproduced or transmitted in any form or means without the prior written
permission of Sepura Limited.
Disclaimer
Sepura’s policy is to continually improve its products. The features and
facilities described in this document were correct at publication, but are
subject to change without notice.
Contact Details
Sepura Limited
9000 Cambridge Research Park
Beach Drive
Waterbeach
Cambridge
CB25 9TL
United Kingdom
sepura.com

1
Contents
Safety Information.......................................................................... 2
Exposure to RF Energy ........................................................ 2
Operation.............................................................................. 2
Regulatory Compliance ........................................................ 2
Unpacking............................................................................. 2
SCG22 Model Variant Options ...................................................... 2
Console Options and Accessories............................................... 2
Isolating Power ..................................................................... 2
Mobile Radio Internal Back-up Battery ........................................ 3
Installation Precautions................................................................. 3
Certied Antenna Types........................................................ 3
RF Energy ............................................................................ 4
Specialised Vehicles............................................................. 4
Installation Guidelines and Recommendations .......................... 4
Operator Access and Safety................................................. 4
Temperature and Orientation Considerations............................. 5
Location Considerations ....................................................... 5
Connector Sealing ................................................................ 6
RF Compatibility Checks............................................................... 6
SCG22 Variants .............................................................................. 7
Parts Supplied ................................................................................ 7
Additional Equipment .................................................................... 7
Connecting Leads................................................................. 7
Mounting Kits........................................................................ 7
SCG22 Components and Connections ........................................ 8
Rear Panel............................................................................ 8
Front Panel ........................................................................... 8
Fitting a SIM Card........................................................................... 9
DIN Slot Mounting Considerations............................................... 9
Front Mounting the SCC3 Console............................................. 10
SCG22 Mounting Kit Options...................................................... 13
SCG22 DIN Mount Kit ........................................................ 13
Mounting Bracket................................................................ 15
SCG22 U Bracket Mount Kit............................................... 15
SCG22 Cabling and Connections ............................................... 16
Loudspeaker Connections.................................................. 16
DC Supply Connection ....................................................... 16
Antenna Connections ......................................................... 17
Cabling and Connections Overview - All Models................ 18
Cabling and Connections to an SRG Installation ............... 19
USB Programming Lead (300-02009) ................................ 20
SCG Power/Ignition Lead (300-02010) .............................. 20
Loudspeaker and IO Connection Options .......................... 20
Programmable I/O .............................................................. 22
LED Indicator...................................................................... 22
SCC3 Console .............................................................................. 23
SCC3 Connections and Cabling......................................... 23
SCC3 Mounting Options..................................................... 24
Handset-Based Console (HBC3)................................................. 30
Conguring the HBC3......................................................... 32
Fist Microphone/Handset ............................................................ 32
Remote Microphone and Switches Installation................... 32
Programming/Customising the SCG22...................................... 33
Programming ...................................................................... 33
Customising........................................................................ 33
Connecting a Remote SIM Reader.............................................. 34
Mobile Data Terminal ................................................................... 34

2
Unpacking
Unpack the container(s) and ensure that all items specied on any delivery
note are present and received in good condition.
If any of the goods are damaged or not supplied, contact your service provider
within 10 days of receipt of equipment.
Consoles or accessories are not shipped in the container with the SCG22
mobile radio due to the many combinations available.
Note that the accessory pack must be specied at the time of ordering.
ALWAYS keep documentation supplied with the product for future reference
and pass on to any person who is responsible for operating the product.
SCG22 Model Variant Options
The SCG22 mobile radio is supplied in model variants, with di󰀨erent functions
and connections to suit the installation. This installation guide describes all the
functionality and connections available, highlighting options where appropriate.
Console Options and Accessories
There are many options available for the installation of the SCG22. Depending
on the model variant, the SCG22 can accommodate up to two remote
consoles, for example an SCC3 and an HBC3, with additional accessories
such as a st microphone or handset connected through the SCC3.
The mobile radio is designed to be installed within a vehicle, on a motorcycle
or as a standalone unit within an o󰀩ce environment using a Desk Mount Unit
(DMU).
There are a number of vehicle, motorcycle and desktop accessories that can
be attached to the SCC3. Refer to the installation instructions supplied with
these products. See our website for more information (sepura.com).
Safety Information
READ THE TETRA PRODUCT SAFETY GUIDE (SPR-DOC-00170)
SUPPLIED WITH THE SCG22 FOR IMPORTANT INFORMATION
ABOUT SAFELY OPERATING THIS PRODUCT.
ALWAYS POWER OFF the mobile radio in environments where RF wireless
devices could potentially cause an explosion. Potentially hazardous areas are
not always signed. Obey all signs and instructions relating to the usage of RF
wireless devices.
DO NOT touch the antenna when the mobile radio is powered on.
In order to reduce the risk of RF burns, the antenna must always remain
connected when the equipment is powered on. DO NOT connect or
disconnect the antenna whilst the equipment is powered on.
Potential risk of burn injury. DO NOT touch the heatsink ns when the
transceiver is powered on.
ONLY t an approved accessory. If a non-approved accessory is tted, it may
compromise the product safety ratings and may void any product warranty.
DO NOT attempt to dismantle this product. Servicing and repairs to this
product must be performed by trained service technicians at Sepura approved
service centres.
Exposure to RF Energy
Sepura designs and manufactures products to meet strict guidelines and
international standards relating to Radio Frequency (RF) energy and the
potential health risks associated with using RF wireless devices. If you have
any concerns relating to long term health risks associated with using RF
wireless devices, you should obtain advice from your employer.
Operation
It is the responsibility of the person operating the product to ensure that it is
operated safely at all times, and that local laws and regulations governing the
usage of Radio Frequency (RF) wireless devices are observed. Obey all signs
and instructions relating to the usage of RF wireless devices.
Regulatory Compliance
This product must be installed in accordance with national and local radio
communications authorities and/or Health and Safety regulations.
This product may a󰀨ect public broadcast radio, security code alarm systems
and some engine management systems.
Isolating Power
Vehicle Installation
CAUTION! The fuse in the power supply line must be
used as the isolation mechanism and removed before any
connections are made to the SCG22.
Desk Mount Unit (DMU) Installation
CAUTION! The power supply connector must be used as
the isolation mechanism and must be removed before any
connections are made to the SCG22.

3
WARNING! DO NOT smoke or use naked ames when
working near the vehicle’s fuel system.
READ ALL THE INSTRUCTIONS before attempting to install the SCG22.
If you do not understand the instructions, STOP and contact your service
provider or Sepura for assistance.
Always read the vehicle manufacturer’s handbook before starting to install the
product. Installation of this product may a󰀨ect the vehicle electrical systems.
CAUTION! Prolonged operation of the SCG22 with the
vehicle engine powered OFF, may drain the vehicle’s
battery.
Disconnect the vehicle’s battery before commencing
installation (be aware of the e󰀨ect on the public broadcast
radio security code, alarm systems and some engine
management systems).
Ensure that fuel lines, hydraulic lines and existing cables are not damaged
during installation.
Ensure that the installation does not impede the normal operation of the
vehicle, including the operation of any safety device, e.g., airbags and seatbelt
tensioners.
Speed control, fuel injection, anti-lock braking, navigation, air bag and other
electronic systems are relatively immune to RF interference. However, if
di󰀩culty is experienced or faulty operation is suspected, consult the vehicle’s
dealer.
ALWAYS perform RF compatibility checks after installation. See "RF
Compatibility Checks" on page 6.
Certied Antennas
The SCG2229 is certied for use with a 2 dBi gain Bluetooth / Wi-Fi antenna
and a 7 dBi TETRA antenna. Higher gain antennas should not be used to
ensure compliance with RF eld strength limits. Minimum distances from
antenna to users are given in the following table:
CAUTION! Only use hand tools and do not over-tighten
screws and xings.
CAUTION! Risk of product damage. When carrying out
installation requiring the removal of product covers, ESD
precautions must be taken.
Installation Precautions
The SCG22 mobile radio has a small rechargeable internal back-up battery.
This battery powers the internal Real Time Clock in the event that the main
power to the product is removed.
The battery may have discharged during the manufacturing process or if the
product has been in storage for some time.
When the product is connected to its main supply, the back-up battery will
charge regardless of whether the product is powered on or not. The period for
a full charge may be up to 48 hours.
CAUTION! The SGC22 contains a backup battery. The
battery must not be replaced by the user. The equipment
must be disposed of using correct WEEE requirements.
The equipment must not be dismantled, or left in conditions
outside of the stated environmental storage and operating
specications.
WARNING! This equipment is not suitable for use in
locations where children are likely to be present.
Mobile Radio Internal Back-up Battery Contact the vehicle manufacturer if you are not certain if it is safe to install this
product.
Region Occupational
Minimum Distance
General Public
Minimum Distance
Canada 0.4 m 1.2 m
USA 1 m 1 m
EU / UK 0.5 m 1 m

4
RF Energy
Motor vehicle manufacturers make use of electronic vehicle control systems,
e.g., ignition, anti-skid devices etc. The following information is supplied to
ensure that there is no radio frequency interference e󰀨ect upon the vehicle's
electronic systems.
To prevent interference with any other electronic systems in the vehicle, the
antenna should be mounted as far away as possible from these units and their
associated cables. Refer to the vehicle manufacturer's handbook to locate
these items.
Consult the manufacturer's handbook to establish whether it is practical to
disconnect the vehicle battery without a󰀨ecting devices, such as central
locking mechanisms, engine management computers, security-coded in-car
entertainment units etc.
Specialised Vehicles
The installation on certain specialised vehicles, such as fuel tankers and re-
ghting vehicles may be subject to additional safety regulations which must be
closely observed. Prior to commencing an installation on such a vehicle, make
sure that any relevant safety regulations are fully understood.
Petrol/Diesel Powered Vehicles
Ensure that there are no petrol/diesel leaks before commencing an installation
involving the use of electric tools as these can produce sparks. Ensure that no
damage to the fuel tank or fuel lines occurs when drilling holes.
Gas Powered Vehicles
Before installation starts ensure that there are no gas leaks before
commencing an installation involving the use of electric tools as these can
produce sparks. DO NOT USE A NAKED FLAME. Butane and propane are
heavier than air, so if there is a leak the gas may lay on the oor of the boot.
The gas is detectable by its characteristic smell. The point of escaping gas
may show signs of frosting. The vehicle owner should arrange for the leak to
be repaired before the installation is commenced.
Ensure that no damage to the gas tank or gas lines occurs when drilling holes.
Supply cables should be run, if possible, on the opposite side of the vehicle to
the gas fuel pipe.
Vehicles Fitted with Electronic Devices
In theory, any vehicle electronic systems could be a󰀨ected by the presence of
an RF eld of su󰀩cient intensity, which when detected may cause the device
to malfunction. The source of RF may be an SCG22 installed in the vehicle
itself or one operating in another vehicle in close proximity. If interaction did
occur, loss of control could result for the duration of the transmission.
In the interests of safety, the user must be asked to test the vehicle
when the installation is complete.
Installation Guidelines and Recommendations
This installation guide provides basic information about installing the
mobile radio into land based vehicles (not marine based vehicles or
motorcycles).
The installation of this product must be performed by a suitably
skilled and technical competent person such as a qualied vehicle
installation technician.
This product can be installed into various makes and models of vehicles and
therefore these instructions are not a denitive guide to installing the product
into vehicles.
The installation should comply with FCS1362 CODE OF PRACTICE for the
installation of mobile radio and related ancillary equipment in land based
vehicles (see http://www.fcs.org.uk).
Before you start the installation, ensure that you have all the accessories,
including cables.
Operator Access and Safety
Install the console in a position where the operator has easy access to the
controls and the microphone when wearing a seat belt. The controls must also
be within the driver's normal eld of vision.
DO NOT t the console above the driver's or passenger's head, or in other
positions where the console would become a hazard in an accident or is at
risk of damage from any occupant or carried items.
The microphone/handset hook mount must be tted such that the microphone/
handset is easily accessible and the cable cannot interfere with the vehicle
control, or with the driver's feet. Preferably, the loudspeaker should be
installed such that the grille is facing the operator, but out of sight of the
remote hands-free microphone (if tted).

5
If a connector is not in use, the dust
covers or seal bungs provided must
be fitted to reduce the risk of damage
or dust/moisture ingress.
Protect the rear connectors
and connecting cables from
the risk of impact damage.
WARNING! The heatsink may become hot after long
periods of transmission. Ensure accidental contact
with the heatsink is not possible.
Location Considerations
The SCG22 must be tted within the interior of the vehicle
(excluding the engine compartment) and protected from the external
environment and vehicle cleaning operations.
Locate the SCG22 away from sources of strong electromagnetic interference
including cables powering the starter motor or the electric traction motor in
electric vehicles.
Ensure that the installation does not impede the normal operation of the
vehicle, including the operation of any safety devices such as airbags and
seatbelt retainers.
The SCG22 should be positioned so that it does not obstruct, or become at
risk of damage from, any occupant or carried items.
Ensure the heatsink fins are in
free air as much as possible.
Mount the SCG22 with the
top of the heatsink facing
upwards as shown.
Ensure su󰀩cient space is provided above the installation to allow tment and
removal of the SCG22.
Temperature and Orientation Considerations
Reliable transmit operation will be achieved if the SCG22 is mounted such that
the heat sink ns receive a free ow of air, i.e., if it is mounted within 15° of the
normal vertical orientation with no restriction to the ow of convected air. For
any other orientation, varying degrees of degradation may result.
Fitting the SCG22 or console on top of the dashboard is not recommended.
Exposure to direct sunlight may cause the temperature to rise to over 80
°C (176°F). Prolonged exposure to these temperatures may damage the
equipment and invalidate any product warranty.
Do not mount the SCG22 close to a heat source, e.g., in front of a heater vent.

6
WARNING! In the event of an apparent malfunction in
the braking or any other systems during RF compatibility
checks, the SCG22 installation should be rendered
inoperative and the vehicle manufacturer should be
contacted before any further use is made of the SCG22
installation. Unqualied persons should not attempt to
modify these units in any way.
RF Compatibility Checks
On completion of the installation, the following checks must be
carried out if the vehicle is equipped with electronic anti-skid,
electronic ignition or engine management systems.
The transmitter should be operated only for the time required to make
an observation. Ideally these checks should be performed on the TETRA
system. If this is not possible, perform the checks in DMO.
An assistant will be required for the following checks:
1. With the vehicle stationary and the engine running at fast idle, operate
the transmitter. Check that the brake lights do not illuminate and that
the engine continues to run normally, i.e., with no surging or cutting
out.
2. Operate the brake pedal, key the transmitter and check that the brake
lights do not extinguish.
3. Put the vehicle into motion at a speed of 15 – 25 km/h (10 –15 mph),
key the transmitter and operate the brake pedal simultaneously.
Check that the braking action is normal and that the engine does not
surge or cut out.
Connector Sealing
To maintain the product's IP54 rating to protect against dust and moisture
ingress, the SCG22 must be tted with connector seals. Any unused
connectors must be tted with a sealing bung or cap. An IP54 Sealing Kit
is provided with the SCG22 consisting of all the sealing parts required.
D-Connectors
Other Connectors
• If the SMA or SMC sockets
are unused, t the cover seals
provided
• If the RJ45 socket is unused, t the bung provided, observing the
correct orientation
1. Carefully peel the adhesive
backing from a D-sub seal.
2. Fit the seal over a D-connector in the correct orientation and press
rmly to attach.
3. If the D-connector is currently unused, t an appropriate seal bung
(male or female) fully into the seal housing.

7
Additional Equipment
Connecting Leads
Part no. Description
300-02007 SCG Power / Ign / IO Adapter Lead
300-02009 SCG USB Programming Lead
300-02010 SCG Power / Ignition Lead
300-02011 SCG Loudspeaker / IO Lead
300-02012 SCG Loudspeaker / IO USB Host Lead
300-02014 SCG Expansion Board Loudspeaker / 8 GPIO Lead
300-02015 SCG Ethernet Sealing Kit
Parts Supplied
The following items are supplied with the SCG22.
Part no. Description Qty
300-02010 SCG Power / Ignition Lead 1
300-02011 SCG Loudspeaker / IO Lead 1
300-00086 Transceiver Plate Mount Kit 1
SPR-DOC-04439 Mobile Radio Compact Installation Guide 1
SPR-DOC-00170 Product Safety Guide 1
IP54 Connector Sealing Kit 1
SCG22 Variants
The following variants of the product are available:
Single Console
Single Console + SD Card
Single Console + BT WiFi +SD Card
Single Console + BT WiFi + SD Card + ESM
Dual Console + BT WiFi + SD Card
Dual Console + BT WiFi + SD Card + ESM
Mounting Kits
Part no. Description
300-02050 SCG22 Local Console Adaptor Kit
300-02051 SCG22 DIN Mount Kit
300-02052 SCG22 U Bracket Mount Kit
300-01117 Console Dash-Mount Kit
300-00804 Console DIN Fitting Kit
300-00784 Console AMPS Backplate
300-00629 AMPS Fitting Kit
300-00860 AMPS Base Plate (1" ball)
300-00861 Handlebar Bracket
300-00862 RAM Double Socket Arm

8
SCG22 Components and Connections
Rear Panel Front Panel
Component/Connector Connector Type Description
1TETRA Antenna BNC Connection for a suitable external TETRA antenna
2LED Indicator N/A Illuminates red when the SCG22 has booted up
3I/O1/SPK1/PRG 9 Way D-sub, Female First console loudspeaker, USB programming , 2 GPIO lines, PEI and packet data
over USB
4Console 1 15 way D-sub, Female First Console (HBC3/SCC3) supporting radio programming, PEI, packet data and
remote SIM card reader over serial interface
5GNSS Antenna SMC Connection for a suitable external GNSS antenna (e.g., GPS)
6Bluetooth®& Wi-Fi Antenna* SMA Connection for a suitable external Bluetooth/Wi-Fi antenna
7I/O2/SPK2* 15 way D-sub, Male Second console loudspeaker and 8 GPIO lines (controlled by AppSPACE only)
8Ethernet* RJ45
9Power 9 Way D-sub, Male DC power input to the SCG22 with ignition sense (e.g. from a vehicle)
10 Console 2* 15 way D-sub, Female Second Console (HBC3/SCC3) supporting radio programming, PEI, Packet data
and Remote SIM card reader over Serial interface
11 SIM Card Cover N/A
*Optional connections depending on the model variant.

9
Fitting a SIM Card
1. Undo the cover securing screw and tilt open the SIM card cover.
PZ-2
2. Carefully t the SIM card into the
slot, pushing in fully until it clicks
into position.
CAUTION! To maintain the
product IP seal rating, ensure
that the SIM card cover is retted
and the securing screw is fully
hand-tightened.
CAUTION! Ensure there is enough depth in the DIN
slot to accommodate the SCG22 and connected
cables without causing damage.
DIN Slot Mounting Considerations
If the SCG22 is mounted into a DIN slot, consideration must be given to
the depth available to safely accommodate the radio and any connecting
cables.
If there is a depth restriction in the DIN slot:
If there are no depth restrictions:
Fit the longer clips, supplied
with the DIN Slot Mount Kit
The screw is retained on the cover.
Note: For installations where a remote SIM reader
is used, see the section "Connecting a Remote SIM
Reader" on page 34.

10
Front Mounting the SCC3 Console
The SCC3 console can be tted directly to the front panel of the SCG22
using the SCG22 Local Console Adaptor Kit (300-02050). The combined
unit can then be mounted using one of the bracket options, or into a DIN
mount slot in the vehicle.
1. Undo the SIM card cover screw. The screw is retained on the cover.
PZ-2
2. Remove the four front fascia xing screws and retain them for re-use.
T10
3. Carefully pull the fascia cover away from the SCG22. Apply even
pressure to ensure the D-connector PCB is removed without
damaging the connectors.
4. If the SCG22 is to be tted in a DIN slot with depth restrictions, an
optional bezel is provided in the kit to act as a spacer. Slide the bezel
over the front panel of the SCG22 in the orientation shown.
Note: For installations where the SCC3 is mounted
separately to the SCG22, see the section "SCC3
Mounting Options" on page 24.

11
6. Fit the SCC3 adapter plate
using the four screws
removed in step 2.
T10
MAX 0.5 Nm
IMPORTANT! Fit a SIM card before tting the SCC3
adapter plate. The SIM card is not accessible after the
SCC3 has been tted.
7. Remove the eight screws on the rear of the SCC3 and remove the
existing cover. Retain the screws for re-use.
5. Fit the connecting cable supplied in the mounting kit to
the front connector on the SCG22. Ensure the connector
is rmly clipped in position.
CAUTION! ESD precautions must be taken during
replacement of the rear cover.

12
10.Fit the other end of the cable to the socket on the of the SCC3.
11.Fit the SCC3 on to the adapter plate, taking care to ensure the cable
is neatly folded in the seal housing and does not get trapped. Secure
in position using the four screws provided.
T10
9. Fit the new rear cover to the SCC3 using
the eight screws removed in step 6.
8. Carefully remove the rear cover seal from the existing cover. Fit the
seal into the channel on the adaptor rear cover included with the
mounting kit.
CAUTION! To maintain the product IP seal rating,
care must be taken not to damage the rear cover seal.
Do not stretch the seal when retting.

13
12.If tted, slide the optional bezel up to the rear cover of the SCC3. SCG22 Mounting Kit Options
The SCG22 can be mounted using a range of options to suit the
installation. The mounting options can be used with or without the SCC3
console tted to the front panel of the SCG22.
SCG22 DIN Mount Kit
1. Fit the appropriate length DIN mount clips to both sides of the SCG22
and secure in position with the screws provided.
Long clips
PZ01
Short clips

14
2. Fit the DIN cage into the slot within the vehicle.
To remove, use the DIN
release tools (provided)
3. When all the cabling has been routed and connected to the rear panel
of the SCG22, slide the unit fully into the DIN cage.

15
1. Fix the bracket securely in position, using
an appropriate number and type of xing
screws for the surface material.
2. Lower the transceiver into the bracket and align the xing holes. Fit
the two adjustment knobs and tighten at the desired angle.
SCG22 U Bracket Mount Kit
The SCG22 can be tted to the optional U Bracket Mount Kit (300-
02052), providing a exible mounting solution to a at surface. If the
SCC3 console is tted to the front panel of the SCG22, the bracket can
be tilted to provide an optimum viewing angle.
29
205
190
179
15
122
91
61 133
149
Rear connector locations
Outline of SCG22 profile.
All dimensions are in millimetres
Drill four holes at the fixing centres indicated to
suit the fastener type (5 mm MAX diameter)
Front connector location
Mounting Bracket
CAUTION! Ensure xing screws are of an appropriate
type and length for the surface material the bracket is
being mounted on to.
IMPORTANT! Allow su󰀩cient space around the
SCG22 for cables and access to connectors
If the SCG22 needs to be installed on a at surface, such as in a car
boot, the xed mounting bracket option supplied (in the box) can be used.
Fit the mounting plate to the bottom of the SCG22 using the four
screws supplied. Secure the mounting bracket and SCG22 assembly
to the desired surface using four screws. The bracket can be used as a
template to mark and pre-drill the holes if required.

16
SCG22 Cabling and Connections
Note: Both the remote console and loudspeaker
extension cables are colour coded blue at the
SCG22 end to aid installation before the SCG22 is
installed. Loudspeaker Connections
The following lead options provide connection to loudspeakers:
• SCG Loudspeaker / IO Lead
• SCG Loudspeaker / IO USB Host Lead
• SCG Expansion Board Loudspeaker / 8 GPIO Lead
CAUTION! The transceiver will be damaged if either
of the loudspeaker conductors (grey twin conductor
cable) is connected to ground. If the loudspeaker
output is to be connected to other audio systems, an
audio isolation transformer must be used.
CAUTION! Ensure that the cables are routed so that
they are kept clear of any existing vehicle system
cabling. Secure all cabling to eliminate the possibility
of damage by sharp edges or moving parts.
All cabling should be hidden and not left loose.
WARNING! 12V supply leads, antenna cables and
speaker wiring must be routed as far away as possible
from gas or fuel lines, and any in-vehicle electrical
wiring. This reduces the risk to safety in the event of
a leak.
DC Supply Connection
The following lead options provide connection to the DC supply:
• SCG Power / Ignition Lead
• SCG Power / Ign / IO Adapter Lead
CAUTION! The transceiver is designed for nominal
12V negative earth systems. DO NOT use on other
supply systems because this will result in damage to
the product.
CAUTION! Ensure that the colour console cable and
any loudspeaker cables are routed so that they are
kept well clear of antenna cables and of any other
electronic devices such as electromagnetic systems
or AM/FM radios.
It is recommended that the power cable runs are kept as short as
possible. In a new installation where the SCG Power / Ignition Lead is
used:
1. With the SCG22 end of the power connector resting in its intended
nal position, route the wires to the vehicle battery, threading the
cable through the bulkheads if necessary (include the blue wire where
ignition switching is not required, see 3 below).
2. The positive power line must include a fuse as close as possible to the
power source. The negative power line must be connected close to
the battery-to-vehicle-body connection (not directly to the battery) and
must not include a fuse.
3. The blue wire provides an ignition sensing input. If ignition switching
is required, trim the wire to length so that it can be wired, via a
fuse, to the ignition switch, using the splicing connector provided.
Otherwise this wire must be connected, via a fuse, to the permanent
positive supply. A fuse must always be tted close to where the wire is
connected.
4. Check the installation and t the blade fuses. Fuse rating:
• Positive supply 10A, Ignition sense 1A (Automotive 19 mm
blade type - Littelfuse ATO®).

17
Antenna Connections
TETRA Antenna
For best all round performance of the product, the antenna should be
tted on the centre of the vehicle roof. Alternative positions, such as wing
mounting, will give degraded performance. The coaxial feeder should be
secured along its length to eliminate the possibility of damage by sharp
edges or moving parts.
WARNING! Observe all safety warnings relating to the
location and use of the antennas.
GNSS Antenna Installation
The SCG22 can be licensed to activate the GNSS antenna socket.
Please note that the transceiver tracks GLONASS and GPS satellites
simultaneously. See customer support bulletin CUS-14-2045.
The antenna unit connects to a SMC connector on the rear panel of the
transceiver and should, ideally, be mounted on the highest point of the
vehicle (i.e., roof) with an uninterrupted view of the sky, and as far from
the TETRA antenna as possible. For mounting, follow the manufacturer’s
installation instructions. It is recommended to t the GNSS antenna
connector before connecting the Remote Console Cable.
An active antenna is recommended, the supply of which is on the centre
pin, 5 V nominal, 40 mA maximum. This supply feed is short circuit
protected.
Bluetooth/Wi-Fi Antenna Installation (optional)
If a Bluetooth/Wi-Fi receiver is tted at the time of manufacture, a
Bluetooth/Wi-Fi antenna socket will be tted.
The antenna unit connects to a SMA connector on the rear panel of
the transceiver and should, ideally, be mounted on the highest point of
the vehicle (i.e., roof), and as far from the TETRA antenna as possible.
For mounting, follow the manufacturer’s installation instructions. It
is recommended to t the Bluetooth/Wi-Fi antenna connector before
connecting the Remote Console Cable.
Digital I/O Connections
The following lead options provide programmable IO connection lines:
• SCG Power / Ign / IO Adapter Lead
• SCG Loudspeaker / IO Lead
• SCG Loudspeaker / IO USB Host Lead
• SCG Expansion Board Loudspeaker / 8 GPIO Lead
If any of these IO connection options are to be used, see the section
"Programmable I/O" on page 22.
CAUTION! If not used, fold and tie any unterminated
IO line wires so that they are tidy and cannot make
electrical connection with other components or
conductive surfaces.
USB Connections
A host* connection lead is available for connecting approved USB
devices:
• SCG Loudspeaker / IO USB Host Lead
CAUTION! *Do not exceed the maximum current
rating when powering USB devices.
Ethernet Connection (optional)
The SCG Ethernet connector provides an additional connection for data.
CAUTION! To maintain an IP54 rating, the BNC, SMC
and SMA connectors must provide a seal.

18
Cabling and Connections Overview - All Models