Simoco Wireless Solutions SRP9100AC VHF PORTABLE TRANSCEIVER User Manual SERVICE MANUAL
Simoco Australasia Pty Ltd VHF PORTABLE TRANSCEIVER SERVICE MANUAL
Contents
- 1. SERVICE MANUAL
- 2. USERS GUIDE
SERVICE MANUAL
SRP 9100 Series
FM VHF/UHF Portable
Radio Transceiver
SERVICE MANUAL
TNM-M-E-0012
ISSUE 1.24
January
2006
SRP9100 Series FM VHF/UHF Portable Transceiver TNM-M-E-0012 ~ Iss 1.24
Page 1.1
2 ~ SERVICE PHILOSOPHY
Table of Contents
TABLE OF CONTENTS.............................................................................................................................1.1
DECLARATION .........................................................................................................................................1.3
COPYRIGHT ..............................................................................................................................................1.3
ERRORS AND OMISSIONS......................................................................................................................1.3
DOCUMENT HISTORY..............................................................................................................................1.4
LIST OF ASSOCIATED PUBLICATIONS.................................................................................................1.4
WARNINGS AND CAUTIONS...................................................................................................................1.5
GLOSSARY OF TERMS............................................................................................................................1.5
GLOSSARY OF TERMS............................................................................................................................1.6
1. INTRODUCTION............................................................................................................................1.13
1.1 GENERAL....................................................................................................................................1.13
1.2 SCOPE........................................................................................................................................1.13
1.3 DESCRIPTION ..............................................................................................................................1.13
1.4 PRODUCT VARIANTS AND FACILITIES ...........................................................................................1.14
1.5 SOFTWARE VERSIONS AND NAMING .............................................................................................1.16
1.5.1 Filename Structure ...........................................................................................................1.16
1.5.2 Application Code ..............................................................................................................1.16
1.5.3 Software Type Code.........................................................................................................1.16
1.5.4 Version Number................................................................................................................1.17
1.5.5 Exclusions.........................................................................................................................1.17
1.5.6 Displaying Software Versions...........................................................................................1.17
1.5.7 Automatic Version Upgrade Prompting............................................................................1.18
1.5.8 Transceiver SW Description, Start-up and Backup-Software ..........................................1.19
1.5.9 Wailing Siren (Boot-up Software Corrupted)....................................................................1.19
1.6 ADJUSTMENT AND ALIGNMENT.....................................................................................................1.20
1.7 SPECIFICATION............................................................................................................................1.20
1.7.1 General.............................................................................................................................1.20
1.7.2 Transmitter........................................................................................................................1.21
1.7.3 Receiver............................................................................................................................1.22
ETS 1.22
AS4295 1.22
1.7.4 Signalling ..........................................................................................................................1.23
1.7.4.1 CTCSS..................................................................................................................1.23
1.7.4.2 FFSK.....................................................................................................................1.24
1.7.4.3 Selcall ...................................................................................................................1.24
1.7.4.4 DTMF....................................................................................................................1.26
1.7.4.5 DCS ......................................................................................................................1.27
1.7.4.6 C4FM....................................................................................................................1.27
1.7.5 Environmental...................................................................................................................1.28
2. SERVICE PHILOSOPHY...............................................................................................................2.29
2.1 SERVICE CONCEPT......................................................................................................................2.29
2.2 WARRANTY .................................................................................................................................2.29
2.2.1 Service Within and Out Of Warranty ................................................................................2.29
2.2.2 Ancillary Items ..................................................................................................................2.29
Page 1.2 2 ~ SERVICE PHILOSOPHY
2.3 SOFTWARE POLICY .....................................................................................................................2.29
3. DISASSEMBLY .............................................................................................................................3.30
4. TECHNICAL DESCRIPTION...........................................................................................................4.1
4.1 RECEIVER.....................................................................................................................................4.1
4.1.1 Front-End Filters and RF Amplifier.....................................................................................4.1
4.1.2 First Mixer and IF Section ..................................................................................................4.1
4.1.3 Quadrature Demodulator....................................................................................................4.1
4.1.4 Receiver Audio Processing ................................................................................................4.2
4.2 TRANSMITTER ...............................................................................................................................4.3
4.2.1 Drivers and PA Stages .......................................................................................................4.3
4.2.2 Power Control.....................................................................................................................4.3
4.2.3 Antenna Changeover and Harmonic Filter.........................................................................4.3
4.2.4 Transmitter Audio Processing ............................................................................................4.3
4.3 FREQUENCY SYNTHESISER............................................................................................................4.5
4.3.1 General...............................................................................................................................4.5
4.3.2 PLL .....................................................................................................................................4.5
4.3.3 VCO’s .................................................................................................................................4.5
4.3.4 Negative Bias Generator and Loop Filter...........................................................................4.5
4.3.5 Phase Modulator ................................................................................................................4.5
4.3.6 Reference Oscillator...........................................................................................................4.6
4.4 CONTROL .....................................................................................................................................4.7
4.4.1 DSP and PLA .....................................................................................................................4.7
4.4.2 DSP Clock Oscillator ..........................................................................................................4.7
4.4.3 PLA PWM ...........................................................................................................................4.7
4.5 MEMORY.......................................................................................................................................4.8
4.6 POWER SUPPLIES .........................................................................................................................4.8
4.6.1 Power On Function.............................................................................................................4.8
4.6.2 Power Supplies...................................................................................................................4.9
4.6.2.1 5V Regulator U900.................................................................................................4.9
4.6.2.2 5V Regulator U901.................................................................................................4.9
4.6.2.3 3.3V Regulator U902/Q918....................................................................................4.9
4.6.2.4 2.5V Regulator U903..............................................................................................4.9
4.6.2.5 Negative Power Supply U904E/F...........................................................................4.9
4.6.2.6 Switched Battery ....................................................................................................4.9
4.7 KEYBOARD AND DISPLAY (MMI) ..................................................................................................4.10
5. ALIGNMENT (LEVEL 3 SERVICE ONLY)......................................................................................5.1
5.1 TEST EQUIPMENT ..........................................................................................................................5.1
5.2 TEST SET-UP ................................................................................................................................5.3
5.2.1 COMMS Set up ..................................................................................................................5.3
5.2.2 Radio Preparation ..............................................................................................................5.5
5.2.3 Alignment Procedure..........................................................................................................5.6
5.2.3.1 VCO DAC Alignment ..............................................................................................5.6
5.2.3.2 TCXO (Radio Netting Adjustment) .........................................................................5.7
5.2.3.3 Rx Front End ..........................................................................................................5.8
5.2.3.4 Mute/Audio Balance Adjustment ............................................................................5.9
5.2.3.5 RSSI .....................................................................................................................5.10
5.2.3.6 Tx Power ..............................................................................................................5.11
5.2.3.7 Modulation ............................................................................................................5.12
5.2.3.8 Programming........................................................................................................5.13
5.2.3.9 Customers Radio Configuration Data ..................................................................5.13
6. REPLACEABLE PARTS...............................................................................................................6.14
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6.1 COMMON PARTS .........................................................................................................................6.14
6.2 ACCESSORIES.............................................................................................................................6.15
A. ACCESSORY CONNECTOR....................................................................................................................... A1
B. ACCESSORIES............................................................................................................................................B1
Declaration
The performance figures quoted are subject to normal manufacturing and service tolerances. The right is
reserved to alter the equipment described in this manual in the light of future technical development.
Copyright
All rights reserved. No part of this publication may be reproduced in any form or by any means without the
prior permission of TMC Radio.
Errors and Omissions
The usefulness of this publication depends upon the accuracy and completeness of the information
contained within it. Whilst every endeavour has been made to eliminate any errors, some may still exist. It is
requested that any errors or omissions noted should be reported to:
Product Engineering
TMC Radio Pty Ltd.
1270 Ferntree Gully Road
Scoresby Vic
3179 Australia
Ph: +61 3-9730-3800
Fax: +61 3-9730-3968
Mob: +61 408-160-661
e-mail: jkuhrt@tmcradio.com
http://www.tmcradio.com/
Page 1.4 2 ~ SERVICE PHILOSOPHY
Document History
Issue Date Comments
Draft A-1 2004-01-10 Initial issue for Review
1.21 2004-05-15 Official Release
1.22 2004-06-24 Replaceable parts BOM corrected
1.23 2005-01-31 Update Mute/Audio offset adjustment
1.24 2005-09-05 Updated for Rev 2.
List of Associated Publications
Document No. Description Issue
TNM-U-E-0045 SRP9100 Brief User Guide 1
TNM-U-E-0047 SRP9100 Operating Instructions PMR 1
TNM-U-E-0048 SRP9100 Operating Instructions Trunked 1
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Warnings and Cautions
WARNING
The Power Amplifier Module may use semiconductor devices containing Beryllium Oxide. Dust
from this oxide is toxic and, if inhaled or skin contact is made, can be hazardous to health.
No danger can arise from normal handling, but no attempt should be made to break open or
tamper with these devices in any way.
These items should not be discarded with industrial or domestic waste.
Caution
Customer configuration files should be saved prior to any alignment adjustments.
Preparing the radio for alignment will erase from the radio all customer PMR and Trunking
configuration data (channel, signalling information etc). The only data retained by the Alignment
Tool is the factor
y
ali
g
nment data for the radio
(
DAC settin
g
s for Tx
p
ower, front-end tunin
g
etc
)
.
WARNING
SRP9100 radio equipment is to be connected to TMC approved chargers and accessories only.
WARNING
Do not dispose of batteries in a fire or expose them to high temperatures.
WARNING
Do not operate your radio, without a handsfree kit, whilst driving a vehicle.
WARNING
Do not operate your radio in an explosive atmosphere. Obey the “Turn Off Two-way Radios”
signs where these are posted, e.g. on a petrol station forecourt.
Page 1.6 2 ~ SERVICE PHILOSOPHY
GLOSSARY OF TERMS
A summary of common radio terms and some other terms used in this document, and their meanings, are
given below.
3RP Trunking Signalling Specification relating to trunked networks for shared use. Used
primarily for networks in France.
ADC Analogue to Digital Converter.
AFC Automatic Frequency Control.
AGC Automatic Gain Control.
Alarm A Selcall sequence sent from subscriber equipment to indicate an Emergency
situation.
When activated the radio will enter a repeating sequence consisting of an Alarm
Live Transmit Time and an Alarm Dead Receive Time.
ANN Abbreviation for Algorithmic Network Numbering. This is the numbering system
where the numbers presented to the radio user can be mapped directly to the
MPT1327 PFIX/IDENTs and vice versa by use of a fixed algorithm in combination
with some other customisation parameters. See also FPP and MEP.
ANI Automatic Number Identification.
Auto Interrogate An Acknowledge identity sent as a response to an individual reset call.
Automatic Power Feature whereby the transmit power is automatically set to a level determined by
the level of the received signal. This is used to extend the battery life and/or
reduce radiated emissions.
Background Hunting The searching for an alternative and 'better' control channel whilst already on a
valid control channel.
BCAST MPT1327 broadcast message. Used to transmit information about the trunked
radio system to radio units.
Busy The state of a channel such that:
• For a non-signalling channel - if Busy this means that the carrier is above squelch.
• For a channel with CTCSS/DCS - if Busy this means a signal is being received
with either no CTCSS tone / DCS code or the correct CTCSS tone /DCS code.
• For a channel with Selcall - if busy this means a closed channel where the signal is
above squelch.
A feature that equates to 'Do Not Disturb' such that the radio will reject all non-
emergency calls. This feature can be activated using the busy key (if assigned) or
from a menu; it is reset to disabled at switch on.
C4FM Compatible 4-Level Frequency Modulation.
Call Back A request, sent by the dispatcher, to a unit requesting that the unit calls the
dispatcher back.
CCSC Control Channel System Codeword.
Channel Spacing The distance (in Hz) between the defined frequency channels.
CHEKKER System Interface Specification for Trunked Networks in Germany.
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CLIM Call Limit Time; time limit on calls made. Normally this is defined by the Call Time
Limit parameter but can by overridden by the TSC depending upon the setting of
TSCLIM.
CLIME Emergency Call Limit Timer.
Closed A state where transmit and receive are not allowed until a Selcall message to open
the channel has been received. A Closed Channel is one that defaults (when
selected or after timed reset) to its closed state. Contrast with Open. Normally a
Closed channel would have Selcall Mute and PTT Inhibit would be enabled.
CODEC COde (Analogue to Digital Converter) / DECode (Digital to Analogue Converter).
Community Repeater A communications set-up whereby different groups of radios can operate by using
only one base station. This is achieved by the use of CTCSS tone signalling such
that each group has a different CTCSS tone (encode and decode) and radios can
only communicate with other radios in their group. Only one group of radios can
use the base station at any one time.
Continuous A continuous control channel is one that is only used by one site. There are no
breaks in the transmission of signalling. Emergency Call Time Limit
Control Channel A channel used for the transmission of messages that enables the TSC to control
radios. Control channels may either Continuous or Timed Shared.
Control Channel Burst A feature that enables control channel burst transmissions on systems using time-
shared control channels. It is unavailable if the control channel acquisition type is
not 'Time Shared'. To make available: go to Control Channel Acquisition Type and
set to Time-shared.
CRU Central Repair Unit
CTCSS CTCSS stands for Continuous Tone Controlled Squelch System. A continuous
tone (lower than the audio range of the receiver) is modulated onto the carrier as
well as other signalling or voice traffic. Compare with DCS. Only receivers that
have been instructed to recognise the same CTCSS tone are able to receive the
transmissions, since the squelch of receivers looking for different CTCSS tones
prevents the audio from being heard. This provides a simple method of sending
messages to selected receivers only and allows several different networks to use
the same frequencies. CTCSS is also known as Tone Lock or Tone Squelch.
DAC Digital to Analogue Converter.
Dash (-) digits Digits known as 'No Tone' digits used in Selcall Identities.
DCS Digital Coded Squelch system is based on sending a continuous stream of binary
code words using, low deviation, direct frequency shift keying. Only receivers
which have been instructed to recognise the same DCS sequence are able to
open their squelch and receive the associated speech transmissions. This
provides a simple method of sending messages to selected receivers only and
allows several different networks to use the same frequencies.
Decode Reception of signalling. Either Selcall where encoded tone frequencies are
decoded and identified as specific tones digits or CTCSS/DCS where tones are
analysed to see if the channel should be opened.
Demanded Demanded Registration; a procedure in which the TSC forces a single radio unit to
attempt registration immediately (providing the radio is not already attempting to
register).
Disabled The 'False' state of a parameter. That indicates this parameter is not active.
Typically this state is represented by an unmarked check box. Compare with
Enabled.
Page 1.8 2 ~ SERVICE PHILOSOPHY
DSP Digital Signal Processor.
DTMF Abbreviation of Dual Tone Multi-Frequency signalling. Used to dial into Telephone
networks using tone dialling.
Dual Watch A facility that enables the Radio to periodically monitor another channel for a signal
above squelch. Typically applications are checking an emergency channel whilst
on another channel.
Economiser A process by which the Receiver is powered down whilst there is no received
signal. Periodically the receiver is powered up to check for such a signal. This is
used to extend the battery life of a Portable.
Enabled The 'True' state of a parameter. That indicates this parameter is active. Typically
this state is represented by a mark (either a tick or a cross) in a check box.
Compare with Disabled.
Encode Transmission of signalling. Either Selcall where Selcall tone digits are encoded
into tone frequencies or CTCSS/DCS where tones modulated onto the channel's
carrier.
ETS European Technical Standard.
Fallback A mode of operation that may be entered when the Network is suffering a
malfunction. During this mode certain facilities (e.g. PSTN) may not be available.
FFSK Fast Frequency Shift Keying. This is a signalling system for the transfer of digital
information. It works by using one of two audio tones to represent data being
transmitted.
Fleet A group of units formed such that only a shortened form of dialling (2 or 3 digits) is
required between them. These groups are normally assigned contiguous Idents.
FOACSU Full Off Air Call Set Up. A method of call set-up where the calling party has to
manually answer the incoming call before the trunking system will allocate a traffic
channel to the call. This reduces the loading on traffic channels as it prevents them
being allocated to calls when the called party is not present to deal with the call.
PLA Programmable Logic Array.
FPP Field Personality Programmer.
Hash (#) digits These digits are used for two purposes:
• For Selcall identities (encode and decode) - known as User Id digits. These digits
are replaced by the user id entered at switch on (if enabled)
• Use in DTMF dialled strings - their use is network dependent to access special
services.
IDENT A 13 bit number used for Identification purposes. Associated with a Prefix (PFIX)
this forms a 20 bit address which is used for identification purposes in signalling
between the radio and the trunking system.
Identity Name given to a sequence of tones that is used in sequential tone signalling. See
Valid Selcall Digits.
Idle State The state of the radio when it is not in a call.
Inaccessible A state of a channel such that it is unavailable to the user through normal methods
of channel selection. Therefore inaccessible channels will not appear on the
channel menu.
Include Calls These types of calls are used to allow a 3rd party to join into an existing call.
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Link Establish Time A delay incorporated into the start of every selective call or DTMF transmission
that allows for the finite delay of the radio equipment in responding to any radio
signal. This includes both the commencement time of the originating transmitter
and the response time of the receiver.
Locked A state of a channel whereby it is not possible to change channels using the
normal up/down keys on the channel menu until the OK key is pressed. See Auto
Channel Selection Lock.
MEP Miniaturisation Extent Parameter. Used in systems that use ANN numbering.
Modifier Part of a dialled string that modifies the nature of the call made to a number (e.g.
dialling "*9" before the number that is to be dialled will modify the call to be an
emergency call).
MPT1327 A signalling standard for Trunked Private Land Mobile Radio Systems. Defined for
systems in the UK but also used outside the UK. Issued January 1988.
MPT1343 A System Interface Specification for commercial Trunking networks. Defined for
systems in the UK but also used outside the UK. Issued January 1988.
Noise Blanker A circuit designed to reduce automotive ignition interference.
NDD Network Dependent Data. This is a field within the CCSC codeword that is used by
the trunking system to identify information about the trunking network and, in
particular, information specific to the site that is radiating the control channel. It is
used by the radio when it is acquiring a control channel to identify valid channels.
Null Id A Selcall identity that is not defined and whose tones' field is displayed as a blank.
Open A state where transmit and receive are allowed. The channel is no longer open
when reset. Contrast with Closed.
Normally an Open channel would not have Selcall Mute and PTT Inhibit would be
disabled.
OPID Network Operator Identity used in Regional Systems. See Roaming.
PABX Private Automatic Branch Exchange.
Password An optional password system available on the radio. This feature is only available
if the radio does has a display and a keypad. To make available: go to Hardware
Components, Terminal Settings and set Product Type to one which has a display
and a keypad.
PFIX The 7 most significant bits of an MPT1327 address number. Normally same fleet
units have same prefix. Relates to individual and group address numbers.
PLL Phased Locked Loop.
PMR Private Mobile Radio (not normally trunked).
Priority Channel A channel in a search group that is scanned between every other channel.
PSTN Public Switched Telephone Network
PTT Press To Talk. This is the term given to the operator’s key normally used to
commence transmitting a message.
PTT Inhibit A state whereby transmission using the PTT is not allowed. Also know as Tx
Lockout.
PWM Pulse Width Modulation
Queuing The storing of a Selcall Identity for later transmission.
Page 1.10 2 ~ SERVICE PHILOSOPHY
If inhibited from transmitting a Selcall sequence because the channel is busy then
the radio can queue the Send 1 / Send 2 sequence for later transmission. When a
radio unit is in Queuing mode all incoming calls are stored automatically in a
queue for later examination. The caller is given an indication that the call has been
queued by the called party. The queue will contain the identity of the caller and the
status value received (if a status call). Up to 20 calls may be queued. The Queuing
mode may be selected using the Modes Menu.
Note: Connecting a MAP27 device to a radio that is in queuing mode will disable
queuing. All incoming calls will then be routed both to the radio user interface and
to the MAP27 device connected to the radio. Also known as Logging Mode
Reference Frequency Normally this is generated from a high stability crystal oscillator reference and is
divided digitally in a frequency synthesiser for comparison with other frequency
sources, e.g. a VCO.
Registration Registration is a technique used to ensure that the trunking system knows the
location of radio units that are using the system. This allows the system to set-up
calls quickly without having to search the whole system for the called radio.
Repeat Tone A selcall tone that is used to replace repeated tones. Fixed at tone E.
Example: An identity entered as '12333' would be sent by the radio as '123E3'.
Reset Resetting is caused by Three Tone Reset, a Remote Reset, and an Individual
reset or a Group reset (Call Types in Decode Identity). When a radio is reset the
effect on the radio will be as follows:
• Any Call Alerts will be stopped
• The Call LED flashing will stop
• If the channel is in Open mode then the channel is closed
• The PTT is optionally inhibited (see PTT Inhibit After Reset Sequence).
• In searching - if paused on a Selcall channel then searching resumes
• If the Acknowledge property of a Decode Identity is set to 'Auto Interrogate' or
'Transpond & Auto Interrogate' then the Auto Interrogate encode identity is
transmitted.
Roaming This is a process that allows changing between regional trunking systems which
have different Operator Identities (OPID 's). Not allowed on MPT1343 Systems.
RSSI Received Signal Strength Indicator.
Scanning Process of switching between the channels in the nominated search group in
cyclic sequence, stopping when the search condition (which may be to look for
either a free or a busy channel) is satisfied.
SDM Short Data Message.
Selcall Selective Calling - a system of signalling which allows 'dialling up' of specific
mobiles, portables and controllers. Such a system may be used to pass messages
as a data message to a specific user or group of users. It can be used to provide
remote switching facilities and to provide access control into community repeaters
or similar devices.
Selcall Mute A state of the audio gate whereby the loudspeaker is muted (closed).
Selcall System Selective Calling, uses a tone sequence at the start, and end, of a call to control
which members of a fleet react to the transmission.
SFM Short Form Memory.
Sidetone Sidetone is the audio which can be (optionally) heard when Selcall, DTMF and
toneburst transmissions are made.
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Simplex Mode of operation whereby the radio operates as a conventional fixed channel
radio outside the Trunking network.
Squelch System used to prevent weak, unintelligible signals and random noise from being
heard by a radio operator while still allowing intelligible signals to be received
normally. This is accomplished by the use of a threshold below which any received
signals are ignored. Only signals whose signal-to-noise ratio is above the squelch
level cause the audio circuits of the radio to be enabled, with the result that only
satisfactory signals are received. The squelch level is specified in SINAD.
Star (*) digits Digits known as Status or Message digits. These digits are used for three
purposes:
• Status Digits for Selcall Identities
• Wildcard digits in Status strings
• Use in DTMF dialled strings - their use is network dependent to access special
services.
Status A feature whereby a radio's status (or usually the status of the radio's user) can be
transmitted and a status message from other radios can be displayed. This
operates through status digits in Selcall identities. Either in Encode Identities or
Decode Identities as follows:
Encode Identities: Status digits within the identity are used to transmit the current
situation of the radio's user (E.g. "Out To Lunch").
Decode Identities: Status digits are looked up in a table (Status Menu) for possible
messages to display.
SW Software.
SYS System Identity Code part of the CCSC.
TCXO Temperature Compensated Crystal Oscillator.
Temporary Temporary Registration; a process carried out by the Dispatcher due to some
system failure that prevents it from carrying out normal registration. The radios will
recognise this temporary registration mode but will otherwise use the network in
the same way as if they were registered. They may be required to re-register when
normal registration mode is resumed.
Three Tone Reset This is a system whereby a call to a user automatically reset all other users in a
group.
Example: a call to user '12345' would call 12345 and reset all other users on this
channel with an identity 123nn where n can be any digit 0-9, A-F.
Timed Reset Facility that causes the Radio, after a certain period of time, to restore current
channel to its initial condition e.g. if it was previously searching it will resume
searching.
Time Shared A time-shared control channel is one that is used by more than one site. This
allows a wide coverage area to be obtained using only one frequency.
The forward channel from the TSC to the radio is divided into timeslots. Each site
using the channel is allocated one timeslot in which to transmit and send
signalling.
Therefore, when on a timeshared channel, the radio may be able to receive bursts
of signalling from different sites at different signal strengths and may receive
periods when no signalling is received.
Depending on the type of system, the radio may be able to perform transactions
with any site it can receive from or only with a specific site.
Page 1.12 2 ~ SERVICE PHILOSOPHY
TMR Trunked Mobile Radio.
Tone Burst An audio tone is transmitted at the start of transmission to inform a relay (repeater)
station to switch itself on to relay the transmission.
Transpond An Acknowledge identity sent as a response to an individual call.
TRAXYS Air Interface for the PTT Telecom Trunked Radio Network, used in the
Netherlands.
TSC Trunking Site Controller. Central control required for the Trunking System to
function. Controls base stations.
Tx Inhibit A facility which prevents the user from transmitting,(other than alarms), while the
channel is Busy.
UMP User Memory Plug. A special device that contains the customisation data for the
radio. If this is removed then this can cause the radio to behave in a number of
ways.
User Defined Groups These groups are set up by the user (contrast with Dynamic User Groups) when
the user desires to be included, temporarily, in an existing group. Up to 8 groups
may be defined (in addition to the Network group Idents defined by Network Group
Numbers). This feature is only available if User Defined Groups parameter is
enabled. These temporary groups are lost at switch off unless 'Save Groups at
Switch Off' is enabled.
User Identity This is a sequence of up to four digits entered by the user when the Radio is
switched on, if this option is programmed. These digits are then substituted into
any transmitted Selcall identity which includes # digits.
VCO Voltage Controlled Oscillator.
Vote Method used to compare the signal strength on a current channel with another
specified channel and then to choose the channel having the stronger signal.
Voting Feature used during searching when there is more than one channel that satisfies
the required conditions. It involves examining all the channels that satisfy the
required conditions, and then selecting the channel with the highest signal
strength.
VOX Voice Operated Transmit.
Page 1.13
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1. INTRODUCTION
1.1 GENERAL
The SRP9100 series of FM portable radio transceivers are designed for conventional PMR and Trunked
operation in VHF and UHF radio systems.
The transceiver is available in three functional variants. The variants are as follows:
Description PMR/Trunked
Portable Transceiver with no Keypad SRP9120
Portable Transceiver with Keypad SRP9130
Portable Transceiver with Keypad and Graphic Display SRP9130-Plus
1.2 SCOPE
This manual provides technical specifications, description and servicing details for the SRP9100 series of
portable radio transceivers together with the related accessories.
Unless specifically stated otherwise, the text and illustrations refer to all versions in the series.
1.3 DESCRIPTION
The design concept utilises wide band analogue techniques for RF transmit and receive circuitry with digital
signal processing of analogue or digital modulation and demodulation. Electronic tuning is used throughout
the portable to eliminate manual tuning and level adjustment.
A Digital Signal Processor (DSP) and a Programmable Gate Array (PLA) are used with other dedicated
devices in the SRP9100 to perform the following functions under software control:
• Frequency Synthesis of all operating frequencies.
• Modulation and demodulation of 10/12.5/20/25kHz FM signals on a per channel basis.
• Modem functionality for specified data modulation schemes.
• Filtering, pre-emphasis, de-emphasis, limiting, compression, muting, CTCSS, Selcall or any other
frequency or level dependent signal modification.
• Serial communications with the Control Ancillaries, Field Programmer and Alignment Tool.
• Tuning Control data for Tx and Rx.
The SRP9100 Transceiver comprises a rugged cast internal lightweight alloy chassis that houses two
printed circuit board assemblies and provides all heatsink requirements. The battery slides into the chassis
where it is securely locked via two high impact clips. Release is achieved by depressing a latch on the
battery. The chassis is enclosed in a high impact polycarbonate ABS plastic case that retains the speaker,
keypad and display.
The buttons, connectors and antenna are sealed against moisture and dust ingress by gaskets around keys
and display or bungs in the case of the external connectors.
The main PCB assembly comprises a multi-layer board containing all the RF and control circuitry. The
display or man-machine interface (MMI) board is connected via a miniature connector to the main board. A
flex strip connects the speaker and microphone also to the main board. Provision is made for optional plug-
in accessories in the radio. (eg. for encryption, P25, etc.)
Several battery capacities and technologies are available to suit the endurance requirements of the portable
application.
The antenna is connected to the radio via an SMA plug that is mounted into the radio chassis. The antenna
flange provides it with additional rigidity when seated on the radio body.
Page 1.14 2 ~ SERVICE PHILOSOPHY
1.4 PRODUCT VARIANTS AND FACILITIES
Product variants and facilities are detailed in Table 1-1, Table 1-2 and Table 1-3.
Table 1-1 Common Features for All Variants
Feature: Model: 9120 9130 9130+
Keys 7 Function keys. All keys
can be customised. 7 Function keys. All keys
can be customised
7 Function keys. All keys
can be customised
Keypad - 12 button numeric keypad 12 button numeric keypad
Display LCD 12 character with bit
mapped section and fixed
icons.
LCD 12 character with bit
mapped section and fixed
icons.
Graphic LCD 102 x 64 pixels.
Volume Rotary control Rotary control Rotary control
Indicators Tri-colour LED’s Tri-colour LED’s Tri-colour LED’s
Facility connector Yes Yes Yes
Frequency Bands
Channel Spacing
66-88MHz, 136-174MHz, 174-208MHz, 335-375MHz,
400-480MHz, 440-520MHz
10/12.5/20/25kHz
Menu driven Yes
Limited selections
Yes Yes
Customisable Menus Yes Yes Yes
Table 1-2 Conventional-PMR Variants
Feature: Model: 9120 9130/9130+
Channels 200 1000
Signalling CTCSS / DCS Selcall/FFSK/DTMF CTCSS / DCS/Selcall/FFSK/DTMF
Text Messaging FFSK test messaging display
Selcall status messaging
FFSK text messaging display
Selcall status messaging
Attack Operation Yes Yes
DTMF Encode Pre defined Encodes via function keys Free form encodes via keypad
Pre defined Encodes via function keys
PTT Limit Timer with
warning beeps
Yes Yes
PTT Inhibit on Busy Yes Yes
Scanning 100 groups with up to 15 channels per
group. 240 groups with up to 15 channels per group.
4 user defined scan groups.
Voting Up to 50 groups consisting of up to 16
channels per group. Up to 200 groups consisting of up to 16
channels per group.
Priority Scanning Yes Yes
Nuisance Delete - Yes
Multiax Yes Yes
Phonebook 250 entries 250 entries
P25 Optional Optional
Page 1.15
2 ~ SERVICE PHILOSOPHY
Table 1-3 Trunked Variants
Feature: Model: 9120 9130/9130+
Channels 1024 channels in 50 sub-bands
Frequency Bands Specifically: 136-174MHz, 400-450MHz (and possible in all other bands)
Background Hunt and
Vote-Now
Yes Yes
MPT1343 dial strings Yes Yes
ANN Numbering Yes Yes
Phonebook Memories 250 250
User Phonebook Recall entries configured by FPP only. Recall and edit.
Alpha Status List Yes Yes
SDM/EDMs Yes Yes
NPDs Yes Yes
Attack Operation Yes Yes
Page 1.16 2 ~ SERVICE PHILOSOPHY
1.5 SOFTWARE VERSIONS AND NAMING
There are various associated items of Software (SW) required for the SRP9100 radio and programmer to
operate. This section simply defines the naming rules of the SW files to allow identification and conformity.
This allows different versions of SW to be distributed and co-exist without confusion.
The SRP9100 Transceiver has three items of SW for digital and analogue PMR, Trunking and Alignment.
1.5.1 Filename Structure
• 2 character Application code
• 2 or 3 character SW Type code
• 3 character version number
• File Extension as required.
eg.
91tm533.bin
91p_533.bin
91s_533.bin
1.5.2 Application Code
This identifies the application the SW was initially designed for:
91 = Standard SRP9100 Software
1.5.3 Software Type Code
This identifies different types of SW within an application.
s_ Start-up code (for alignment and start-up)
p_ Conventional PMR code
p_s Scrambler
tm Trunk MPT
ta Trunk ANN
bo Transceiver Boot-code
bc Transceiver Boot-Backup-code
bf Transceiver PLA-code
ba Transceiver PLA-Backup-code
Note. The above file names are not stored within the code. As a consequence, when the radio is read by the
FPP, the FPP will display version numbers and release dates for the Backup, Startup, PMR, TMR and
DMAP codes. The Bootloader, PLA Backup and PLA codes show release dates only.
Page 1.17
2 ~ SERVICE PHILOSOPHY
1.5.4 Version Number
This is a 3-digit number allocated by Engineering to identify the SW version.
eg. 103 = Version 1.03
1.5.5 Exclusions
The Programmer SW does not follow the above rules, as it is a PC based Program and its version number
can be easily identified by starting the SW. Later releases of SW will be backward compatible, unless
deliberately not so, in which case a different directory structure/path may be implemented.
1.5.6 Displaying Software Versions
Each Transceiver SW code file (e.g. 91tm258.bin, etc.) contains version information about itself and possibly
compatible Programming SW.
For Radio SW saved on Disk, this information can be displayed via the Programmer function:
Options : Upgrade_Software : Get_File
Page 1.18 2 ~ SERVICE PHILOSOPHY
For Software loaded in the radio, information can be read from the Transceiver and displayed via the
Programmer function:
Options : Radio_Information
The portable software version can be read from the portable display if required by accessing the Set-up
menu and then choosing Radio Info and selecting the software version on the radio.
1.5.7 Automatic Version Upgrade Prompting
When a configuration is downloaded to the Transceiver, the Programmer performs a brief check on the SW
currently installed in the radio. If a later version of SW exists (on PC hard disk) then the Programmer will
prompt the user with the following message:
NOTE. As early versions of FPP cannot recognise a more recent revision of the radio, it is important that the
latest FPP version is downloaded from http://www.tmcradio.com
If YES is selected, the Transceiver Radio code is updated before the new configuration is downloaded.
If NO is selected, only the configuration is downloaded.
It is strongly recommended to select “Yes” when this message is shown.
This process also updates the Start-up code to ensure it is compatible with the loaded PMR or Trunk code.
Note: If the …\StandardFPP\RadioSW folder contains no files, then the above check will not be performed.
Page 1.19
2 ~ SERVICE PHILOSOPHY
1.5.8 Transceiver SW Description, Start-up and Backup-Software
The SRP9100 Transceiver software is split into the following separate modules:
• Bootloader and Backup Software
• Start-Up Software
• PLA and PLA-Backup Software
• Mainline PMR Software
• Mainline Trunk Software
When the Transceiver starts, it basically performs the following steps:
• Initial execution starts with the Bootloader code, which attempts to load the Start-Up Software (if
Start-Up checksum is bad, then the Backup Software is loaded.)
• Start-Up Software then downloads the PLA code (or PLA-Backup code if PLA checksum is bad)
to the PLA device. If both PLA and PLA-Backup checksums are bad then the radio is not
operational and serial communication is not possible.
• Start-Up Software then reads the On/Off switch line and compares these with saved parameters
to determine if the radio should be continue to power-up or switch itself off again.
• Start-Up software then attempts to load either PMR or Trunk Mainline Software (dependent on
saved parameter) and switches execution to complete the power-up process and start normal
operation.
If the Mainline Software cannot be loaded, or a Job file configuration has not been loaded (e.g. non-existent
or checksum fail) then execution switches to Backup Software until the error is corrected (e.g. by FPPing
the radio).
There are three states that the radio can end up in after switch-on:
• Mainline Trunk Software or Mainline PMR Software (normal power-up)
If the radio does not have a valid Job file configuration loaded, then it will display a “No PMR Cfg”
or “No TMR Cfg” message.
• Start-Up Software (characterised by “Alignment Mode” shown on the display). This is also the
code that is running when the radio is being aligned using the Alignment Tool.
• Backup Software (via various paths from above.)
1.5.9 Wailing Siren (Boot-up Software Corrupted)
A “WAILING SIREN” sound is emitted from the Loudspeaker while the radio is running in Boot Backup
Software. In this mode the FPP can be used to re-load a Job file, or re-load Start-Up or Mainline Operating
Software.
Simply writing a Job file to the radio should allow the FPP to determine and update the offending software –
however there may be instances where the FPP cannot determine this and the Start-Up and Mainline
Software should be updated manually. This can be done using the FPP : Upgrade_Software: Get_File …
then Download. Both Start-Up Software (filename = 91ks_xxx.bin) and Mainline PMR (91kp_xxx.bin) or
Trunk (91ktxxxx.bin) should be loaded if the FPP cannot automatically fix the problem. The wailing siren
should stop once the problem is fixed.
Note 1: Holding down the alarm key and PTT key when power is applied to the radio will also force the radio
to start-up in Backup Software. This may be useful in some situations.
Note 2: Should these steps fail to restore the set and the Wailing Siren cease, the radio will need to be
returned to a Level 3 Service Centre for FLASH replacement.
Page 1.20 2 ~ SERVICE PHILOSOPHY
1.6 ADJUSTMENT AND ALIGNMENT
There are no internal adjustments in the SRP9100. Re-programming and alignment is performed using
software tools. For testing, a special test jig is required so that the radio PCB can be powered and
input/output accessible. This test jig has a dummy battery and a connector that plugs into the top of the
radio so that the jig controls PTT and provides access to audio in and out.
As the radio has no internal adjustments, there is no need to have the radio PCBs powered while out of the
chassis. Field repair of the PCBs is not recommended as specialised equipment is required to fault find and
repair the boards.
1.7 SPECIFICATION
1.7.1 General
Operation
Single or two frequency simplex (half-duplex).
Modulation
Frequency modulation (phase) F3E, F1D, F1E.
Battery Voltage
7.2V DC (nominal)
Current Consumption
All measurements at 7.2 Volts
Radio off <120uA
Standby (squelched): <120mA
Rx Audio O/P:
500mW <320mA
Transmit: 66-88MHz 136-174MHz 174-400MHz 400-520MHz
1W <0.7A <0.8A <1.0A <1.0A
5W <1.8A <2.2A <2.2A <2.5A
Frequency Bands
Band Frequency Range Band Frequency Range
E0 66 - 88 MHz R1 335 - 375MHz
AC 136 - 174MHz TU 400 - 480MHz
K1 174 - 208MHz UW 440 - 520MHz
KM 208 -245MHz
Switching Bandwidth
Radio covers the complete band without retuning
Channel Spacing
10/12.5/20/25kHz
Frequency Stability (-30°C to 60°C)
Less than ±2.0ppm
Dimensions (mm) Height Width Depth
Radio excluding antenna 147mm
Excluding volume
control
68mm 43 mm
Including std. battery
Weight
Page 1.21
2 ~ SERVICE PHILOSOPHY
Radio only 210g
Battery NiCad 1600mAH 250g
Battery NIMH 2150mAH 230g
Battery Li 3000mAH 180g
Battery NiMH 2700mAH 280g
Antenna E0 30g
Antenna UW 19g
Battery Endurance > 10 hours, high transmit power, 2700mAh battery, 90:5:5 duty
cycle
Conformance Approvals
* Pending in some cases
ETS EN 300 086 *
EN 300 113 *
EN 300 489 *
EN 300 219 *
Australia AS4295 *
1.7.2 Transmitter
Power Output
Any two levels programmable from
High Power: 5W Adjustable down to 0.5W
Low Power: 0.5W Adjustable up to 5W
Transmitter Rise Time
Less than 40 ms
Duty Cycle
1 minute transmit: 4 minutes receive
Spurious Emissions
< 0.25uW (9kHz to 1GHz)
< 1.0uW (1GHz to 4GHz)
Residual Noise
60% deviation. CCITT Weighted
25kHz Channel Spacing >45dB
12.5kHz Channel Spacing >40dB
Audio Frequency Distortion ≤ 3% (at 60% deviation)
Audio Frequency Response
300 to 3000Hz* +1dB -3dB
Figures apply for a flat audio response or a 6dB/octave
pre-emphasis curve
(*2550Hz for 12.5kHz channel spacing)
Audio Sensitivity
(PMR Mode 1kHz)
(User programmable via FPP)
Accessory Connector: 5mV±2dB
Internal Mic: 10mV±2dB
Page 1.22 2 ~ SERVICE PHILOSOPHY
1.7.3 Receiver ETS AS4295
Sensitivity
≤0.5µV PD (-113dBm) for 20dB
SINAD
≤0.3µV PD (-117.5dBm) for 12dB SINAD
≤0.5µV PD (-113dBm) for 20 dB Quieting.
Adjacent Channel
Selectivity 25kHz Channel Spacing: >73dB
12.5kHz Channel Spacing: >60dB
25kHz Channel Spacing: >73dB
12.5kHz Channel Spacing: >65dB
Intermodulation Rejection >65dB >70dB
Spurious Response
Rejection >70dB >73dB
Blocking >95dB >95dB
Conducted Spurious
Emissions <2nW (-57dBm) - 9kHz to 1GHz
<20nW (-47dBm) - 1GHz to 4GHz
<20nW (-47dBm) - 9kHz to 4GHz
GENERAL
FM Residual Noise
(CCITT weighted) 25kHz Channel Spacing: >45dB
12.5kHz Channel Spacing: >40dB
Mute Range
Typically 6dB to 25dB SINAD
Typical setting 10dB to 12dB SINAD
Mute Response Time
<30mS (no CTCSS)
Add 200mS for CTCSS
Voting Response Time Searches at 50ms/channel
Audio Distortion 500mW into 16Ω at <5% distortion
Audio Frequency
Response
300 to 3000Hz*: +1dB to -3dB
Figures apply for a flat audio response or a 6dB/octave de-emphasis curve
(*2550Hz for 12.5kHz channel spacing)
Deviation Sensitivity
(For rated audio at 1kHz) 20% MSD±3dB
Page 1.23
2 ~ SERVICE PHILOSOPHY
1.7.4 Signalling
1.7.4.1 CTCSS
All 38 standard CTCSS Tones are supported as per the table below.
Identifier Frequency Identifier Frequency Identifier Frequency
Q 67.0 C 107.2 0 167.9
R 71.9 L 110.9 1 173.8
S 74.4 D 114.8 2 179.9
T 77.0 M 118.8 3 186.2
U 79.7 E 123.0 4 192.8
I 82.5 N 127.3 5 203.5
V 85.4 F 131.8 6 210.7
A 88.5 O 136.5 7 218.1
W 91.5 G 141.3 8 885.7
J 94.8 P 146.2 9 223.6
= 97.4 H 151.4 * 241.8
B 100 X 156.7 # 250.3
K 103.5 Y 162.2 ‘ ‘ NONE
Encoder
Tone Deviation:
25kHz channel spacing 500 to 750Hz
20kHz channel spacing 400 to 600Hz
12.5kHz channel spacing 250 to 375Hz
Tone Distortion Less than 5.0%
Frequency Error Less than ±0.5%
Page 1.24 2 ~ SERVICE PHILOSOPHY
Decoder
Bandwidth Not greater than ±3.0%
Deviation Sensitivity Less than 6.0% of system deviation (for decode with full RF quieting)
Noise Immunity Less than 500ms dropout per minute at 10dB SINAD
(CTCSS tone deviation 10% of system deviation. RF deviation 60% at
1000Hz).
False Decode Rate Less than 5 false decodes per minute (no carrier input)
Talk-off For no dropouts in one minute, interfering tone at 90% of system deviation
(CTCSS tone at 10% of system deviation).
Full quieting signal: 310Hz to 3000Hz
20dB SINAD RF signal: 320Hz to 3000Hz
12dB SINAD RF signal: 350Hz to 3000Hz
Response Time Less than 250ms (full quieting/tone >100Hz)
Less than 350ms (full quieting/tone <100Hz)
De-Response Time Less than 250ms
Reverse Tone Burst none
1.7.4.2 FFSK
1200 Baud: 1200 / 1800 Hz MPT1317 based
2400 Baud: 1200 / 2400 Hz MPT1317 based
1.7.4.3 Selcall
The following tone sets are supported as per tables below:
• ST-500: CCIR, EEA, ZVEI, DZVEI, EIA
• ST500/CML: ZVEI_3, DZVEI
• CML: CCIR, EEA, ZVEI
• SIGTEC: CCIR, CCIRH, EEA, ZVEI_1, XVEI_2, ZVEI_3, NATEL, EIA
• SEPAC: CCIR, EEA, ZVEI_1, ZVEI_2, ZVEI_3, EIA
Page 1.25
2 ~ SERVICE PHILOSOPHY
Selcall Tone Frequency Table
Tone CML ST500 SIGTEC SIGTEC SEPAC CML ST500 SIGTEC
CCIR CCIR CCIR CCIRH CCIR EEA EEA EEA
0 1981 1981 1981 1981 1981 1981 1981 1981
1 1124 1124 1124 1124 1124 1124 1124 1124
2 1197 1197 1197 1197 1197 1197 1197 1197
3 1275 1275 1275 1275 1275 1275 1275 1275
4 1358 1358 1358 1358 1358 1358 1358 1358
5 1446 1446 1446 1446 1446 1446 1446 1446
6 1540 1540 1540 1540 1540 1540 1540 1540
7 1640 1640 1640 1640 1640 1640 1640 1640
8 1747 1747 1747 1747 1747 1747 1747 1747
9 1860 1860 1860 1860 1860 1860 1860 1860
A 2400 1055 2110 2400 2400 1055 1055 2110
B 930 .... 2400 930 1055 930 .... 1055
C 2247 2400 1055 2247 2247 2247 2400 2400
D 991 .... 2247 991 991 991 .... 2247
E 2110 2110 930 2110 2110 2110 2110 930
F .... .... 991 1055 .... .... .... 991
Tone SEPAC CML ST500 SIGTEC SEPAC SIGTEC SEPAC SIGTEC
EEA ZVEI ZVEI ZVEI-1 ZVEI-1 ZVEI-2 ZVEI-2 ZVEI-3
0 1981 2400 2400 2400 2400 2400 2400 2200
1 1124 1060 1060 1060 1060 1060 1060 970
2 1197 1160 1160 1160 1160 1160 1160 1060
3 1275 1270 1270 1270 1270 1270 1270 1160
4 1358 1400 1400 1400 1400 1400 1400 1270
5 1446 1530 1446 1446 1446 1446 1446 1400
6 1540 1670 1670 1670 1670 1670 1670 1530
7 1640 1830 1830 1830 1830 1830 1830 1670
8 1747 2000 2000 2000 2000 2000 2000 1830
9 1860 2200 2200 2200 2200 2200 2200 2000
A 1055 2800 970 2600 2800 970 885 2400
B 970 810 .... 2800 970 885 741 885
C 2247 970 2800 741 885 741 2600 741
D 2400 886 .... 970 .... 2600 .... 2600
E 2110 2600 2600 810 2600 2800 970 2800
F .... .... .... 886 .... 600 .... 600
Page 1.26 2 ~ SERVICE PHILOSOPHY
Tone SEPAC ST500/CML ST500 SIGTEC SIGTEC SEPAC ST500
ZVEI-3 ZVEI-3 DZVEI DZVEI NATEL EIA EIA EIA
0 2200 2400 2200 2200 1633 600 600 600
1 970 1060 970 970 631 741 741 741
2 1060 1160 1060 1060 697 882 882 882
3 1160 1270 1160 1160 770 1023 1023 1023
4 1270 1400 1270 1270 852 1164 1164 1164
5 1400 1530 1400 1400 941 1305 1305 1305
6 1530 1670 1530 1530 1040 1446 1446 1446
7 1670 1830 1670 1670 1209 1587 1587 1587
8 1830 2000 1830 1830 1336 1728 1728 1728
9 2000 2200 2000 2000 1477 1869 1869 1869
A 885 885 2600 825 1805 459 2151 2151
B 741 .... .... .... 1995 2151 1091 ....
C 2600 810 886 2600 1300 2600 2400 2010
D .... .... 810 .... 1700 2010 .... ....
E 2400 970 2400 2400 2175 2433 459 459
F .... .... .... .... 2937 2292 .... ....
Selcall Tone Periods
The Selcall tone period:
4 pre-set lengths selectable: 20ms and 30 seconds in 1ms increments.
1.7.4.4 DTMF
DTMF Encode supported via keypad:
TONES 1209Hz 1336Hz 1477Hz
697Hz 1 2 3
770Hz 4 5 6
852Hz 7 8 9
941Hz * 0 #
Tone Period, programmable: 0 – 2.55ms in 10ms steps.
Inter-Tone Period, programmable: 0 – 2.55s in 10ms steps.
Link Establishment Time, programmable: 0 – 10s in 10ms steps.
Tx Hang Time, programmable: 0 – 9.99s in 10ms steps.
Side-Tone in Loudspeaker: selectable via programmer.
Page 1.27
2 ~ SERVICE PHILOSOPHY
1.7.4.5 DCS
Data rate 134 bits per second, frequency modulated
7.46ms/bit
171.6ms per codeword continuously repeating
Deviation 0.5kHz for 12.5kHz systems
1kHz for 25kHz systems
Codeword size 23 bits comprising:
8 bits - DCS code (3 octal digits 000-777)
3 bits - Fixed octal code 4
11 bits - CRC (error detection) code
Available Codes 104 codes from 512 theoretically possible codes – see below
Turn off code 200ms 134Hz tone at PTT release
DCS Codes can be Transmitted “Normal” or “Inverted” (programmable).
The radio can Receive DCS codes in either Transmitted “Normal” or “Inverted” or both (selectable via
programmer).
Valid DCS Codes
023 132 255 413 612
025 134 261 423 624
026 143 263 431 627
031 145 265 432 631
032 152 266 445 632
036 155 271 446 654
043 156 274 452 662
047 162 306 454 664
051 165 311 455 703
053 172 315 462 712
054 174 325 464 723
065 205 331 465 731
071 212 332 466 732
072 223 343 503 734
073 225 346 506 743
074 226 351 516 754
114 243 356 523
115 244 364 526
116 245 365 532
122 246 371 546
125 251 411 565
131 252 412 606
1.7.4.6 C4FM
Digital speech format in accordance with TIA/ EIA 102 requirements.
Page 1.28 2 ~ SERVICE PHILOSOPHY
1.7.5 Environmental
Note: Operation of the equipment is possible beyond the limits stated but is not guaranteed.
Operational Temperature
-30°C to +60°C
Storage Temperature
-40°C to +80°C
Vibration Specification
IEC 68-2-6 with additional frequency acceleration from 60 – 150Hz
Cold
IEC 68-2-1 Test 5 hours at -30°C
Dry Heat
IEC 68-2-2 Test 5 hours at +60°C
Damp Heat Cycle
IEC 68-2-30 Test 2 cycles at +40°C
Product Sealing
Main Radio Unit: IEC529 rating IP54
Accessories: IEC529 rating IP54
MIL STD 810
Low Pressure 500.4 Procedure II
High Temperature Storage 501.4 Procedure I
High Temperature Operation 501.4 Procedure II
Low Temperature Storage 502.4 Procedure I
Low Temperature Operation 502.4 Procedure II
Temperature Shock 503.4 Procedure I
Humidity 507.4 Figure 507.4-1
Sand and Dust 510.4 Procedure I – Blowing Dust
Random Vibration 514.5 Figure 514.5C-1
Transit Drop 516.5 Table 516.5-V1
Functional Shock of severity 25g
Acceleration, 6ms pulse duration,
500 shocks in 6 directions.
Page 2.29
2 ~ SERVICE PHILOSOPHY
2. SERVICE PHILOSOPHY
2.1 SERVICE CONCEPT
The SRP9100 series has been designed to provide low cost trunked and non-trunked analogue, portable
transceivers, using common core electronics, software and interfacing. It is a requirement that once the
customer has purchased equipment, TMC Radio can follow this by providing an ongoing, high level of
customer support together with a competitive and professional servicing activity.
There are three levels of service available:
Level Activity Recommended Spares Recommended Test
Equipment
1 Replacement of complete
transceiver/antenna/fuses
Reprogramming
Antennas, Fuses
Ancillaries Multimeter P.C.
Radio software
Programmer
2 Replacement of PCB or
mechanical component
replacement, Cosmetic repair
Listed in Level 2 Spares
Schedule As above + service aids and
test equipment
3 Repair by PCB or mechanical
component replacement,
Cosmetic repair.
Repair of Radio PCB to
component level in CRU.
Listed in Level 2 Spares
Schedule
Radio PCB components
only available to CRU.
As above + service aids and
test equipment
2.2 WARRANTY
Initially, the normal 12-month warranty will apply to all radios and ancillaries.
2.2.1 Service Within and Out Of Warranty
The field Service Level for the SRP9100 portable is LEVEL 2, PCB replacement.
LEVEL 2 Service, PCB (only) and case part replacement, will be carried out in field repair workshops, or the
Central Repair Unit (CRU) if required.
LEVEL 3 Service (Radio PCB component level repair) will ONLY be carried out in the Central Repair Unit.
For this, the complete radio must be returned to the CRU.
A PCB replacement program may be offered by the CRU in some countries.
2.2.2 Ancillary Items
All ancillary items are Level 1 service.
These items should be replaced if faulty; they are non-repairable, and non-returnable to the CRU.
2.3 SOFTWARE POLICY
Software provided by TMC Radio shall remain the Company's property, or that of its licensors and the
customer recognises the confidential nature of the rights owned by the Company.
The customer is granted a personal, non-exclusive, non-transferable limited right of use of such software in
machine-readable form in direct connection with the equipment for which it was supplied only.
In certain circumstances the customer may be required to enter into a separate licence agreement and pay
a licence fee, which will be negotiated at the time of the contract.
Page 3.30 2 ~ SERVICE PHILOSOPHY
The customer undertakes not to disclose any part of the software to third parties without the Company's
written consent, nor to copy or modify any software. The Company may, at its discretion, carry out minor
modifications to software. Major modifications may be undertaken under a separate agreement, and will be
charged separately.
All software is covered by a warranty of 3 months from delivery, and within this warranty period the
Company will correct errors or defects, or at its option, arrange free-of-charge replacement against return of
defective material.
Other than in the clause above, the Company makes no representations or warranties, expressed or implied
such, by way of example, but not of limitation regarding merchantable quality or fitness for any particular
purpose, or that the software is error free, the Company does not accept liability with respect to any claims
for loss of profits or of contracts, or of any other loss of any kind whatsoever on account of use of software
and copies thereof.
3. DISASSEMBLY
Remove the Battery
(1) Depress the spring-loaded battery latch to release the battery.
(2) Slide the battery down the radio to disengage the retaining lugs.
(3) Lift the battery away from the radio.
Figure 1 Battery Removal
Remove the Antenna and On/Off/Volume Control Knob
(1) Unscrew and remove the antenna.
(2) Remove the lanyard ring (if fitted).
(3) The On/Off/Volume control knob is a friction fit. Pull the knob from its spindle.
(4) Remove the smart interface cover from the smart interface jacks and the antenna boss.
Page 3.31
2 ~ SERVICE PHILOSOPHY
Remove the Metal Frame Assembly
(1) Use a small, flat bladed screwdriver to release the cast metal frame assembly from the bottom of the
front casing. This action releases the radio PCB from the MMI PCB.
(2) Gently ease the frame assembly out of the front casing taking care not to damage the two flexi-circuits.
(lift the bottom of the frame so that it just clears the plastic casing, then gently slide the frame away from
the top of the casing until it is released from the casing). Caution: The loudspeaker / microphone flexi-
circuit connects the radio PCB (attached to the metal frame) and the loudspeaker / microphone
assembly (attached to the front casing). The flexi-circuit must be released from the connector on the
radio PCB before the frame can be lifted clear of the front casing. Also ensure that the volume
control/top connector assembly stay retained within the chassis and does not fall out.
(3) Slide out the locking drawer of connector, S6, (on the radio PCB) to release the flexi-circuit. Use a very
small bladed screwdriver.
(4) Remove the flexi-circuit from connector, S6.
(5) Lift the frame away from the front casing. At this stage the radio PCB and metal screen are still attached
to the frame.
Figure 2 Removal of Chassis
Remove the Metal Screen from the Radio PCB and Frame Assembly
(1) Use a small, flat bladed screwdriver to release the seven spring tabs on the metal screen. Note:
Releasing three spring tabs on one side and the one at the top of the metal screen should be sufficient
to remove the metal screen.
(2) Lift the metal screen away from the radio PCB and frame assembly.
Page 3.32 2 ~ SERVICE PHILOSOPHY
Remove the Speaker and Microphone
(1) Remove the speaker retaining clip.
(2) Lift the speaker / microphone assembly away from the front casing taking care not to damage the flexi-
circuit.
Figure 3 Removal of Speaker and Microphone
Remove the MMI PCB
The MMI PCB is held in place by four plastic lugs on the front casing.
(1) Using a small flat bladed screwdriver, exert slight sideways and upwards pressure on the edge of the
PCB (close to one of the top retaining lugs) whilst exerting slight outward deflection of the casing side
walls (A). This will release the PCB from the retaining lugs.
(2) Lift the MMI PCB and LCD display assembly away from the front casing.
Figure 4 Removal of MMI Assembly
Page 3.33
2 ~ SERVICE PHILOSOPHY
Remove the Switch Mat
The switch mat is held in place by the MMI PCB. Lift the switch mat clear of the casing.
RE-ASSEMBLY
Re-assembly is the reverse of disassembly. However:
(1) Examine the various seals before re-assembly and replace with new items if necessary.
(2) Slight outward deflection of the case walls will ease re-assembly of the MMI PCB behind the retaining
lugs.
(3) Care must be taken when reconnecting the flexi-circuits to ensure that they are correctly aligned before
pressing home the locking drawers on the connectors.
(4) Ensure that the metal screen is fitted to the PCB / frame assembly before the assembly is fitted to the
casing.
(5) To prevent damage to the frame seal, use a thin, flat piece of plastic (or other material) in a ‘shoehorn’
action between the bottom inside of the front case and the frame / PCB assembly as the assembly is
pushed home. Carefully remove the piece of plastic (or other material) after the frame / PCB assembly
has been fitted to the front case.
Page 4.1
3 ~ TECHNICAL DESCRIPTION
4. TECHNICAL DESCRIPTION
4.1 RECEIVER
Refer to Figure 4-1. Description based on UW band
4.1.1 Front-End Filters and RF Amplifier
The receiver input signal from the antenna passes through the harmonic filter and antenna switch. With the
portable in receive mode, diodes D580, D540a and D541a in the antenna switch are reverse biased allowing
the receiver input signal to be coupled through to the receiver front-end with minimal loss. The overall insertion
loss of the harmonic filter and switch is approximately 0.8dB.
A noise blanker is also fitted to E0 band radios. The noise blanker samples the received signal and gates the
45MHz signal in the IF stage in the event that high level noise transients are received. Due to inherent time
delays in the bandpass filters prior to the blanking gate, gating synchronisation occurs before the transients can
adversely affect the following stages.
Varactor-tuned bandpass filters at the input and output of the RF amplifier provide receiver front-end selectivity.
Varactor tuning voltages are derived from the alignment data stored in the radio. The DSP processes this data
to optimise front end tuning relative to the programmed channel frequencies, which may be changed at any
time without re-aligning the radio.
To achieve the required varactor tuning range an arrangement of positive and negative bias power supplies is
used to provide a total bias across the varactors of up to 14.0VDC. A fixed 2.5V positive bias derived from the
5V0 supply using voltage divider R429/R430 is applied to the cathodes of the varactor diodes. The negative
bias supply originates at the DSP/PLA as a PWM signal (FE TUNE) for the four front-end tuning voltages
TUNE1 to 4, for the particular channel frequency selected. The PWM signal is dependent on channel
frequency and tuning and passes through level shifting transistors Q404 to Q411 where it is converted to a
negative voltage in the range -0.5V to -11.5V. The -12.0V rail of the level translators is generated by U904D/E
with D903 to D906 providing the required voltage multiplication.
The RF amplifier stage comprises a low noise transistor amplifier Q400 that is compensated to maintain good
linearity and low noise matching. This provides excellent intermodulation and blocking performance across the
full operating range. The overall gain of the front-end is typically 14dB for all bands.
4.1.2 First Mixer and IF Section
The output of the last front-end bandpass filter is coupled into single balanced mixer T400/D415 which converts
the RF signal to an IF frequency of 45MHz. The local oscillator injection level is typically +8dBm at T400 pin 1
with low side injection used for UHF bands and high side for VHF bands.
Following the mixer is IF amplifier Q401 that provides approximately 15dB of gain and in association with its
output circuitry, presents the required load conditions to the 4 pole 45MHz crystal filters Z401A/Z401B.
The crystal filters provide part the required selectivity for adjacent channel operation with the remaining
selectivity provided by a DSP bandpass filter algorithm.
4.1.3 Quadrature Demodulator
Additional IF gain of approximately 45dB occurs at U400 which is a dedicated IF AGC amplifier/Quadrature
Demodulator configured for single ended input and output operation. The AGC voltage for U400 is derived from
the RSSI function of the DSP. The onset of AGC operation occurs when RF input signal level at the antenna
connector exceeds -90dBm and can reduce the gain by approximately 100dB for strong signals.
Conversion of the 45MHz IF signal to I and Q baseband signals is carried out by the demodulator section of
U400. The 90MHz local oscillator signal is generated by VCO Q402 which is phase locked by the auxiliary PLL
output of U701 via feedback signal AUX_LO2.
Page 4.2 3 ~ TECHNICAL DESCRIPTION
Harmonic
Filter
L582-L585
Antenna
Switch
D540,
D541,
D580
Bandpass
Filter RF Amp
Q400 BandPass
Filter Mixer
T400 IF Amp
Q401
4 Pole
45MHz IF
Filters
Z401A/B
IQ
Demodulator
U400
RX/TX
AF
Switch
U800A
ADC/DAC
Codec
U820
RX AF
Switch
U302C
AF Amp
U850
Speaker
Switch
Q860,
Q861
PWM AGC
Integrator From
PLA
To TX PA From PLA
Tx Audio
In
From PLA/DSP
TX MOD To TX
VCO / Phase
Modulator
SPKR_ON
TUNE_1, 2 , 3 & 4 IQ
Noise Blanker
E0 Only
To External
Accessory
RX/Disc
AF Switch
U302B
Diff. Amp
U402
TX/RX
Switch
D610/D611
VCO Buffer
Q604/Q605
Synthesiser
Buffer
Q607
RX VCO
Q600
RX VCO
Switch
Q601
to U701
SYNTH
VCO
Control Volts
RX_PSU
90 MHz
VCO
Q402
ACK_LO2
AUX_CP
to U701
from U701
CPP
From PLA
TX_MODE
AGC
Figure 4-1 VHF/UHF Receiver Block Diagram
4.1.4 Receiver Audio Processing
The base band audio from the IQ Demodulator is applied to a differential amplifier that cancels out DC offsets
and converts the balanced demodulator I/Q output signals to unbalanced inputs for the CODEC U820.
All receiver audio processing and filtering functions are performed by the CODEC under the control of the DSP.
The receiver I and Q analogue baseband signals are converted to digital signals by the CODEC ADC before
being applied to a series of digital filters which provide the final stage of adjacent channel filtering, high pass
and low pass filtering, mute noise processing and volume control for narrow and wideband operation. The fully
processed signal is then converted to an analogue audio signal by the CODEC DAC and then applied to
conventional dual speaker amplifier U850-1.
Dual audio amplifier U850 provides an audio output level of up to 500mW watts into the 16 ohm speaker. The
carrier and signalling mute functions are performed by Q860/861 under DSP control. De-emphasis to the
audio is performed within the DSP.
In addition, Discriminator Audio is derived from the other CODEC output channel and then amplified by U802A
after which it is applied to one of the radio I/O connectors for option purposes. Discriminator Audio is a preset
level set by the FPP and is independent of squelch operation. Switch U302B can select either flat or de-
emphasised audio from the CODEC DAC U820-24. The selected audio is applied to the other half of the audio
amplifier U850-2 that drives the options connector audio after which it is routed to the portable’s options
connector.
Page 4.3
3 ~ TECHNICAL DESCRIPTION
4.2 TRANSMITTER
Refer to Figure 4-2.
4.2.1 Drivers and PA Stages
The RF output level from the VCO T/R switch D611a is typically +8dBm. Tx buffers Q550/Q560 increase this
level by approximately 6dB (136-530MHz), 9dB (66-88MHz) and also provide a high degree of VCO isolation
from the Tx output.
The PA module U500 requires a drive power of approximately 17dBm (335-520MHz), 13dBm (136~245MHz)
and 15dBm (66-88MHz). The module contains power control circuitry and MOSFET stages to provide a
maximum output power of +37dBm (5 watts).
Note. Care should be taken during servicing since if for any reason the drive power is lost, while the power
control voltage is high, the current into the PA may exceed its specification. Therefore, the power supply
current should be monitored at all times and preset to as low as required. The radio has additional inbuilt
safeguards, but these should not be relied on.
Power output settings are derived from alignment data stored in flash memory during the initial factory
alignment. The DSP processes this data to optimise the power output level relative to the programmed channel
frequencies that may be changed at any time without retuning the radio.
PA current is monitored via comparator U520B, the output of which is passed via a temperature compensation
network R534 to R537, and analogue gate U800B to ADC U301C. U301C samples the applied voltage after
which it is passed to the PLA and then processed by the DSP.
4.2.2 Power Control
Output power is stabilised by a power control feedback loop. A printed circuit transmission line, L590, R580,
D510 and associated components comprise the power detector. Comparator U520A and associated
components provide the power setting and control functions. Forward power is sampled by the power detector
and applied as a DC voltage to the inverting input of the comparator. The TX_PWR set voltage is a DC voltage
proportional to the programmed Tx power setting and is applied to the non-inverting input of the comparator.
The TX_PWR voltage originates from the PLA as a PWM signal and is integrated for application to the
comparator.
PA module output level changes due to supply voltage, load or temperature variations are detected and applied
to the comparator that proportionally adjusts the PA pre-driver supply, and therefore the PA drive level. High
temperature protection is provided by thermistor R532 that progressively reduces the power level if the PA
module temperature becomes excessive.
4.2.3 Antenna Changeover and Harmonic Filter
The antenna changeover circuit consisting of pin diodes D580/D540a/D541a, is switched by Q541/Q542 and
associated circuitry allowing the transmitter output to be coupled to the antenna while providing isolation for the
receiver input. With the transmitter switched on, the diodes are forward biased allowing power to be coupled
through to the antenna and isolating the receiver by grounding its input at C588. The short circuit at the
receiver input is transformed to an effective open circuit at D580 by L583, which minimises transmitter loading.
With the transmitter switched off the diodes are reverse biased allowing the receiver input signal to reach the
receiver front end with minimal loss. The harmonic rejection low pass filter comprises L582/L584/L585 and
associated capacitors.
4.2.4 Transmitter Audio Processing
The internal microphone unit comprising an Electret microphone provides 10mV RMS (nominal) at the
microphone input (INT_MIC) to provide approximately 60% of maximum system deviation. U800C is a control
gate to switch between the microphone audio signal and EXT_MOD to provide external audio options and data
input.
U800A provides CODEC input switching which selects either the receiver I signal or transmitter audio/data
signals depending on the Tx/Rx mode. All pre-emphasis, filtering, compression and limiting processes for
narrow and wideband operation are carried out in the DSP after A-D conversion by the CODEC (U820). The
processed transmitter audio/data from the CODEC output at VOUTL is applied to the VCO as a modulation
signal with a level of approximately 200mV P/P.
Page 4.4 3 ~ TECHNICAL DESCRIPTION
Directional
Coupler
TX VCO
Q602
VCO
Buffer
Q604/
Q605
TX/RX
Switch
D610/
Q611
TX PA U500
Antenna
Switch
D580/
D540/
D541
Antenna
Switch
Control
Q541/
Q542
Power
Control
Comparator
U520A
Antenna
Filter
L582/
L584/L585
TX VCO
Switch
Q603
LO1_RX
Power
Control
Detector
D510
Integrator
R308/C307
PWM TX Power
Set from PLA
ADC/DAC/
CODEC U820
TX_MOD
From PLA/DSP
RX/TX AF
Switch
U800A
Q
I
TX/RX AF Control
From PLA
Switch
U800C
Internal MIC/ External
Audio Control From PLA
Internal Micropone
External Accessory Audio
PA_ON
Current
Sense
U520-B TX Current Sense to PLA
13V8_UNSW From L8
Audio
Gate
U302-B
TX Buffer
Amp
Q550/
Q560
DATA_EN
Alert Tones to U850
from PLA
TX_CURRENT
Thermal
Shut Back
R532
TX_PWR
MOD_SW
TX_MODE
To RX Mixer
Figure 4-2 VHF/UHF Transmitter Block Diagram
Page 4.5
3 ~ TECHNICAL DESCRIPTION
4.3 FREQUENCY SYNTHESISER
4.3.1 General
Refer to Figure 4-3.
The frequency synthesiser consists of one transmitter and two receiver voltage controlled oscillators, loop
filters, varactor negative bias generator, reference oscillator and an integrated dual phase locked loop device
U701.
4.3.2 PLL
The PLL device contains two prescalers, programmable dividers and phase comparators to provide a main and
auxiliary PLL. The main PLL of U701 controls the frequency of the Tx/Rx VCO’s via Control Voltage outputs at
pins 2 and 3 and VCO feedback to pin 6. The auxiliary PLL is used to control the receiver 90MHz second local
oscillator via the Control Voltage output at pin 17 and VCO feedback to pin 15. The PLL operation involves the
division of the 14.4MHz reference oscillator frequency to 225kHz (VHF) or 450kHz (UHF) by divider. It is then
divided by the internal divider of U701 down to a low frequency that corresponds to a sub-multiple of the radio
channel spacing, ie. 6.25kHz for 12.5/25kHz channel spacing, 5kHz for 10/20kHz channel spacing or 7.5kHz if
required. The VCO frequency is sampled and divided down to the same frequency after which it is phase
compared to the reference. Any error produces an offset to the Control Voltage output that is used to correct
the VCO frequency. A valid lock detect output is derived from pin 20 and is sampled by the PLA. During
transmit, if an unlocked signal is detected the radio will switch back to receive mode. An unlocked signal in
receive mode will cause the radio to beep.
4.3.3 VCO’s
The transmitter and receiver VCO’s use low noise JFET transistors Q600 (Rx), Q602 (Tx) and associated parts
to generate the signals for the required band coverage. Electronic tuning is provided by varactor diodes D600
to D608 with their control voltages derived from the Loop Filter, PLL and Negative Bias Generator. VCO
selection and timing is controlled by the DSP/PLA via the Rx and Tx power supplies and applied through
switches Q601 (Rx) and Q603 (Tx). VCO buffer Q604/Q605 isolates the VCO from load variations in following
circuits and active power supply filter Q615 minimises supply related noise. A PLL feedback signal is sampled
from the VCO buffer output via buffer Q607.
The 90MHz receiver VCO comprises Q402 and associated parts. Automatic tuning is achieved by applying a
Control Voltage to D408/D409 via Loop Filter R433, R445, R464, C467, C493 and C702.
4.3.4 Negative Bias Generator and Loop Filter
A positive and negative varactor bias supply similar to the front-end varactor arrangement has been used to
achieve the required broadband tuning range of the VCO’s. PLL device U701 is programmed to deliver a
nominal +2.5V output from phase detector/charge pump CPPF or CPP regardless of the channel frequency
selected. This voltage is filtered to remove synthesiser noise and reference products by the Loop Filter,
comprising C671 to C686 and R683/R684/R685. The resulting low noise voltage is applied to the cathode side
of the VCO varactor tuning diodes as a positive bias voltage. The negative bias supply originates as a positive
DC voltage (0.1V to 3.0V) at the DAC output of U701 (DOUT) with a level relative to the programmed state of
the radio (eg. channel frequency and Tx/Rx state). The voltage is translated to a negative voltage between 0V
and –16V by the circuit comprising Q700 to Q703. The -16V rail of this supply is generated by U904E/F with
D903 to D906 providing the voltage multiplying effect needed to achieve -16V. The output of the negative
supply is applied directly to the VCO varactor anodes as the negative tuning voltage VCAP BIAS.
4.3.5 Phase Modulator
The modulation path for audio, data and higher frequency CTCSS signals is via varactor D609 and its
associated components in the Tx VCO. The reference input to the PLL (REF) provides the low frequency
modulation path via the Phase Modulator.
The phase modulator comprises the following sections:
- Integrator U760B is a low pass filter providing 6dB per octave attenuation to frequencies above
approximately 10Hz.
- Divider U710 divides the 14.4MHz reference frequency down to 225kHz (VHF) or 450kHz (UHF).
- Ramp generator Q711/Q712 provides a saw tooth output, the slope of which is adjustable via
the MOD_BAL line. This adjustment is set via a DAC output controlled from the Alignment
Page 4.6 3 ~ TECHNICAL DESCRIPTION
Tool. Adjustment of the ramp slope effectively changes the Phase Modulator gain by
modification of the Schmitt Trigger switching points after modulation from the Integrator is
combined to the saw tooth ramp.
The divided reference signal is differentiated and discharges C744 via Q711 after which Q711
is turned off allowing C744 to recharge via constant current source Q712/Q713.
- Schmitt Trigger comprising Q714 to Q716 converts the modulation combined with the saw
tooth ramp to a square wave output, the duty cycle of which is controlled by the ramp slope
and modulation.
Modulation balance adjustment is carried out using a CODEC generated 100Hz square wave applied
to the TX_MOD input and set to give an optimum demodulated square wave output.
4.3.6 Reference Oscillator
TCXO U700 determines the overall frequency stability and frequency setting of the radio. The frequency
setting is achieved by adjusting its ADJ voltage with the Alignment Tool. In addition, the ADJ input is used in
a frequency control loop with the receiver I and Q signals to provide receiver AFC. U700 operates at
14.4MHz and is specified at ±2.0ppm frequency stability over the temperature range -30° to +75°C.
90MHz
VCO Q402
Synthesiser
U701 RX/TX VCO
Q600/ Q602
TX/RX
Switch
D601/
D611
VCO
Buffer
Q604/
Q605
Data From
DSP
Phase
Modulator
Q714-
Q716
Ramp
Generator
Q711-
Q713
Integrator
U711A
TX_MOD
MOD_BAL Prog.
Divider
U710
Buffer
Q710
14.4MHz
Reference
Oscillator
U700
To TX Buffer
REF
PLL Loop
Filter
VCO Neg
Bias
Supply
Q700-
Q703
CPP
CPPF
DOUT VCAP_BIAS
AUX_LO2
AUX_CP
Divide 32 (UHF)
Divide 64 (VHF)
Synth
Buffer
Q607
SYNTH
LO1_RX
Q
RX/TX
Switch
U800A I
Internal
External
TX Audio
Switch
Internal Mic.
External Audio
ADC/DAC
CODEC
U820
TX_MOD
To IQ
Demodulator
U400
LO2
AFC from
PLA
To RX Mixer
Figure 4-3 VHF/UHF Synthesiser, Block Diagram
Page 4.7
3 ~ TECHNICAL DESCRIPTION
4.4 CONTROL
Refer to Figure 4-4.
4.4.1 DSP and PLA
The SRP9100 transceiver operates under the control of a DSP (U201) and PLA (U300) combination that
together with a number of other dedicated devices perform all the operational and processing functions
required by the radio. The PLA is configured by the DSP under software control to provide the following
functions:
• Channel set-up of all operating frequencies
• Modulation processing and filtering
• De-modulation processing and filtering
• Tx power output reference
• Modulation Balance adjustment
• Receiver front-end tuning
• Serial communications with alignment tool, microphone and control head
• Modem functionality for data modulation
• All signalling / CTCSS generation and decoding
• DSP Crystal Oscillator control
• Receiver muting control
• RSSI / AGC control
• AFC
• Tx / Rx switching and PTT control
• PLL lock detect
• Audio switching
• Power On/Off control
• Interface functionality with Option Boards and External Devices
• Battery voltage and Tx current monitor
4.4.2 DSP Clock Oscillator
The DSP is clocked by a 15.360MHz oscillator that consists of crystal X200 and an internal DSP oscillator.
Q200 forms a crystal switching circuit with C205 which, when activated by a command from the PLA, steers the
oscillator away from potential interfering frequencies.
4.4.3 PLA PWM
The PLA must supply several analogue signals to control radio tuning. It does this with several Pulse Width
Modulated (PWM) outputs.
The front-end tune signals (TUNE1-TUNE4) originate from the PLA in the form of PWM signals. The values for
these signals are stored in flash memory from radio alignment and selected depending on the channel that the
radio is currently tuned to. These signals are integrated by RC networks to provide the analogue tuning
voltages that are ultimately applied to the tuning varicap diodes.
Other analogue PWM derived signals used are transmitter power (TX_PWR), receiver AGC voltage (AGC),
LED’s (RED/GREEN) and modulation balance (MOD_BAL).
Analogue inputs are monitored by comparators and a ramp generator that is derived from a PWM signal at the
PLA. Four comparators comprising U301A-D have their non-inverting inputs connected to a ramp voltage
generator.
Page 4.8 3 ~ TECHNICAL DESCRIPTION
Analogue voltages to be monitored such as PLL Loop Voltage (LOOP_VOLTS), key detect (KEY_DET), battery
voltage (BAT_SENSE), transmitter current (TC_CURRENT), volume level (VOLUME) and external sense
(EXT_SENSE) are connected to the inverting inputs. The analogue voltages are compared with the ramp
voltage as they increase and the comparator switches at the point where the input voltage exceeds the ramp.
The PLA compares the time that this occurs with the PWM signal and converts it to a binary value.
4.5 MEMORY
Memory consists of the internal DSP memory and an external 8MB non-volatile Flash Memory U202. When
power is off, all program SW and data are retained in Flash Memory. At power-on, a boot program downloads
the DSP and PLA SW from Flash Memory to their internal RAM’s for faster program execution and access to
data. PLA SW is loaded by the factory into the Flash Memory and can be updated via the Alignment Tool. DSP
SW comprises Start-up code that is also loaded by the factory. High-level SW comprising Operational Code
and Customer Configuration are loaded at distribution centres and are loaded via the FPP Programmer.
DSP
U201
Synthesiser
U701
PLA
U300
Reset
U200
Clock
X200
Flash
Memory
U202
CODEC
U800
Serial port
Serial port
TX_DATA
RX_DATA
XTAL_SHIFT AGC
TX_Power
1. BACKLIGHT
2. SPKR_ON
3. PA_ON
4. TX_MODE
5. LEDS
6. PWR_OFF
7. CHG_INH
8. SYNTH_FAST
9. ANALOG GATE CONTROLS
Tune 1 - 4
BAT_SENSE
Rx
Audio
Tx
Audio
AFC
FUNCTION_EN
LOOP_VOLTS
EXT_SENSE
1. PWR_ON
2. PTT
3. PWR_SENSE
Bit
Outputs
TX_CURRENT
VOLUME
POWER_SENSE
MOD BAL
Bit
Inputs
LOCK
PWM
Outputs
Sampled Analog Inputs
KEY_DET
BAT_SENSE
Figure 4-4 Controller Block Diagram
4.6 POWER SUPPLIES
4.6.1 Power On Function
The unregulated battery input (6.4V ~ 9.6V DC) is routed directly to all high current devices after the battery
fuse and is then switched via FET Q900 to provide BAT_SW supply for all other circuits. The output from Q900
feeds three low dropout series regulators, switched battery voltage and a switch-mode 3.3V DC supply. These
regulated supplies power auxiliary supplies as well as the negative voltage generator. The radio ON/OFF
function is achieved through Q908 and Q909. The On-Off switch is connected between unswitched fused
battery and PWR_ON. When the switch is turned on, a DC pulse is applied to Q908 that turns on the main
FET switch Q900 for approximately 1 sec. In this time, the radio DSP samples the PWR_SENSE line and
determines the state of the on-off switch. If the on-off switch is on, the DSP raises the PWR_OFF line and
latches the main FET on, which then maintains power to the radio circuitry.
Page 4.9
3 ~ TECHNICAL DESCRIPTION
The Power-off operation requires the On-Off switch to be turned off for more than 2 seconds. If the On-Off
switch is sensed going low by the DSP via the PWR_SENSE line, the DSP will save radio settings and then
lower the PWR_OFF line, thereby turning Q900 off.
4.6.2 Power Supplies
The following is a list of the SRP9100 power supplies and some of the devices and circuits they supply.
4.6.2.1 5V Regulator U900
This regulator can be powered down by a STBY signal from the PLA. Supplies RX_PSU and TX_PSU are
switched via Q903 and Q904. Circuits supplied by U900 are as follows.
• Synthesiser reference oscillator, divider and phase modulator
• VCO Varicap driver
• Switched RX PSU to VCO output switch
• Switched TX PSU to TX VCO enable/Rx VCO disable
• Switched TX PSU to Transmit Buffer Amplifiers
• Switched RX PSU to Receive front end and mixer
• 90MHz local oscillator Q402
4.6.2.2 5V Regulator U901
• Transmit and receive VCO’s
• PLL U701
• Analogue gates U302, U800
• Op amp U760
• 3.3V sub regulator Q910
4.6.2.3 3.3V Regulator U902/Q918
• PLL Synthesiser IC U701
• DSP U201
• Flash memory U202
• PLA U300
• ADC CODEC U1, U820
4.6.2.4 2.5V Regulator U903
• DSP U201
• PLA U300
4.6.2.5 Negative Power Supply U904E/F
• -16V output (-16V) for VCO Varicap tuning drivers
• -12V Output (-12V) for Front end Varicap tuning drivers
4.6.2.6 Switched Battery
• Transmit Power Amplifier
• Speaker Amplifier
Page 4.10 3 ~ TECHNICAL DESCRIPTION
4.7 KEYBOARD AND DISPLAY (MMI)
Keypad Press Detection
Electronically, the keypad keys are arranged in a matrix of 3 rows and 7 columns.
The rows are driven directly by two processor port signals KEY_ROW1 and KEY_ROW2 that are normally in
the low state. Transistors TR910-916 generate a unique voltage on KEY_DET3 for each column. Any key in the
same column generates the same voltage.
For example, if key “1” (S903) is pressed TR913 turns on and sets up a voltage on KEY_DET3 according to the
value of R932, R971 on the MMI board and R15 on the main radio board. This generates a processor interrupt
on PTT3. The processor then goes through a process of deactivating the keypad rows selectively until it
deduces which row the key press is in. The KEY_DET3 voltage that initiated the interrupt identifies which
column the key press is in.
Processor Interface to LCD Display
The LCD display is driven by LCD driver chip IC901. The driver chip interfaces to the processor via an 8-bit
data bus with the write cycle being controlled by LCD_CS and the LCD register select line controlled by
processor address line A20. The processor is only able to write to the LCD driver.
Signal Name Use Signal Type
DATA (0:7) Eight lines, processor data 0V or 5V
A(20) Low duty cycle, display address
selection 0V or 5V
BLITE Backlight enable 0V OFF, 5V ON
nLCD_CS Display enable 0V or 5V, active low
nKEY_ROW 1-2 Local keypad enables 0V or 5V, active low
KEY_DET3 Voltage proportional to key press 0V to 5V
AF_PSU Supply 5V nominal
0VA Ground 0V
nWR Write line(for future use) 0V write, 5V read
Four function keys are located below the display:
Legend Function
M Activate menu
– Scroll down through channels (or menu, if active)
+ Scroll up through channels (or menu, if active)
OK Confirm choice or action (ie. Enter).
The SRP9130 has 12 additional keys (supported by the daughter board) arranged as a DTMF keypad.
Page 4.11
3 ~ TECHNICAL DESCRIPTION
Figure 5 Keypad Layout
Backlighting
The LCD and keypad backlighting LED’s, D904 to D918, are turned on by the processor port signal, BLITE, via
driver TR909.
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5. ALIGNMENT (LEVEL 3 SERVICE ONLY)
This procedure is applicable to all versions of SRP9100 portable transceivers.
p
If the radio contains customer configuration data that must be retained, you must first use the SRM/SRP
Personality Programmer (FPP) software to read all radio configuration files and save them on to alternative
media before commencing the alignment procedure.
When the Alignment is completed, use the FPP software to retrieve this stored data and write it back to the
radio.
It is preferred that the radio remain installed in its cast and ABS case so that appropriate shielding and
battery supply are maintained.
Note. Final Tx power adjustments must be performed with the radio board installed in the chassis.
5.1 TEST EQUIPMENT
1. Radio transceiver test set CMT, 52/82 or similar.
Note. For alternative equipment, the
Mod Balance test requires internal DC
coupling between the demodulated
signal and demodulation output
connector.
2. Variable DC power supply 6.4V to 9.6V at 2.5 amps
3. Oscilloscope 20 MHz bandwidth minimum
4. SRP9100 Programming & Alignment Lead P/N PA-PRLD
5. SRP9100 Radio Test Interface Unit OR
See simple interface circuit in Fig 5.1
P/N PA-RTIU
6. Personal Computer 486 DX 66 or better.
Operating system Windows 95 or later.
Minimum RAM - 16MB.
5MB free hard disk space.
Floppy drive - 1.44MB.
Mouse and serial port required
7. SRM/SRP Alignment Tool Computer Software file
8. SRM/SRP Field Personality Programmer
(FPP) Computer Software file
9. SRP9100 Simulated Battery
10. Antenna Adaptor for Portable PA-ACON
Caution
Preparing the radio for alignment will erase from the radio all customer PMR and Trunking
configuration data (channel, signalling information etc). The only data retained by the Alignment
Tool is the factory alignment data for the radio (DAC settings for Tx power, front-end tuning etc).
Using the Alignment Tool will allow changes to the original factory alignment and will invalidate
all warranties and guarantees unless performed by an authorised level 3 service centre.
Page 5.2 6 ~ CIRCUIT DIAGRAMS
3.5mm
2.5mm
DB9F
to PC
3
330R 1% 2
5
2k7
1%
27k
1%
PTT
1uF Bipolar TX AF
In
RX AF
Out
P1761
680R16R
RxD In
TXD Out
470u
25V
470u
25V
2k7
Zener 5v6
27k
1%
1
2
S1
Figure 5-1 SRP9100 Radio Test Interface Unit
Notes for test jig:
1. The PTT switch activates transmit on the portable.
2. Interface data levels are TTL with RS232 polarity, although should work with most personal computers.
3. 16R resistor simulates speaker load.
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2 TEST SET-UP
Test Interface Box
Communications Test Set
To PC Serial Port
RX Audio
TX Audio
Antenna
Accessory
Connections
To Power Supply
Figure 5-2 Test Set-up
Notes:
1. Connect the radio to the test equipment as shown in Figure above.
2. Use an adaptor (P/N PA-ACON) to provide a coaxial socket termination for the antenna.
3. A battery simulator is used to supply power to the portable. This is an empty battery pack with
external DC connections.
5.2.1 COMMS Set up
1. Copy the SRP9100 Alignment Tool Computer Software
file to the PC hard drive and run the program
The Alignment Tool Opening Menu is displayed.
Page 5.4 6 ~ CIRCUIT DIAGRAMS
2. Go to the Options menu and choose Comms Setup.
3. The Comms Setup dialogue box is displayed.
Select the Comms Port setting appropriate to the
configuration of your PC and choose 9OK.
(Usually COM1)
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2.2 Radio Preparation
Radio parameters are to be aligned sequentially as detailed in this procedure.
1. At the Opening Menu, select the Align Menu
and choose Prepare/Read Radio.
2. The WARNING is displayed.
Choose No if you want to save the
configuration and use the FPP software to
read and save the data to a file.
Choose Yes if you want to proceed and go to
step 3.
3. The radio alignment data is read (indicated
by percentage bar) and stored.
The test alignment data is downloaded into
the radio.
Note: In test alignment mode the radio is configured only for 12.5 kHz channel spacing, therefore all
alignment is carried out at 12.5 kHz settings unless otherwise specified. When the radio is
configured with the FPP for other channel spacings, the deviation related levels are calculated on
a per channel basis by the radio software.
Page 5.6 6 ~ CIRCUIT DIAGRAMS
5.2.3 Alignment Procedure
Radio alignment must be done in the sequence detailed in the following paragraphs. This alignment
assumes that the radio is functioning normally.
5.2.3.1 VCO DAC Alignment
1. Select the VCO DAC page.
2. Select Auto Align. The Synth DAC Rx slider will automatically adjust its value for each receiver
alignment frequency to set the VCO loop filter value between 140 and 150.
3. Select PTT and then select Auto Align. The Synth DAC Tx slider will automatically adjust its value for
each transmitter alignment frequency to set the VCO loop filter value between 140 and 150.
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2.3.2 TCXO (Radio Netting Adjustment)
1. Select the Mute/TCXO page.
2. Select PTT.
3. Adjust the TCXO slider to ensure that the transmit frequency error is within 50Hz for the selected
channel (to be measured on the RF Test Set frequency counter).
Page 5.8 6 ~ CIRCUIT DIAGRAMS
5.2.3.3 Rx Front End
1. Ensure that the TCX0 Alignment has been done before proceeding with this section.
2. Select the Rx Front End Page
3. Select Open Mute.
4. Set the Volume slider to 15.
Speaker audio should now be visible on the Scope. If required readjust the Volume slider to a suitable
level.
5. Set the Signal Generator to the Channel 0 carrier frequency, with a 1000Hz modulation signal, a
deviation of ±2 kHz and an RF level of -90dBm.
6. Select Channel 0.
7. Select Auto Align.
The front end will be tuned automatically and finish with an RSSI reading of typically around 150.
8. Repeat Steps 7 to 8 for the remaining 3 Channels (1, 2, & 3).
9. Change deviation to 1.5kHz.
10. Verify that the receiver sensitivity is better than -117.5dBm for 12dB SINAD on all channels.
(Sensitivity is typically -120dBm).
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2.3.4 Mute/Audio Balance Adjustment
Note. This adjustment has default setting of 1000/2600 and should not need changing except for specific
requirements.
1. Select the Mute/TCXO page and select Open Mute.
2. Set the RF signal generator to the receiver alignment frequency, and adjust the RF level such that the
desired mute opening SINAD (typically 10dB SINAD) is achieved.
3. Select Mute Closed and remove the RF input from the radio.
4. Select the Mute/TCXO page
5. Set the Squelch Open and Squelch Close sliders to the fully left position. This ensures the receiver
will be muted.
6. Set the Squelch Close slider to the fully right position.
7. Reconnect the RF input to the radio.
8. Adjust the Squelch Open slider to the right until the mute opens.
9. Reduce the Signal Generator output level by approximately 2dB (or by an amount equal to the
desired mute hysteresis level).
10. Adjust the Squelch Close slider to the left until the mute closes.
11. The mute should now open and close at the desired RF levels.
12. Unsquelch the radio and set the radio volume to minimum.
13. Monitor the DC voltage across the speaker or load.
14. Adjust the Rx Audio Balance DAC to achieve a minimum in the measured DC voltage (within
0V±10mV) and leave at this setting.
15. Note. On revision 2 radios and higher, an additional Tx Audio Balance DAC is also provided.
For these radios, the Tx Audio Balance DAC is defaulted to zero for normal setting. However, for a
more accurate setting, the DC voltage at TP731 needs to be noted during Rx and adjusted by the Tx
Audio Balance DAC to give the same reading (to within 10mV).
Page 5.10 6 ~ CIRCUIT DIAGRAMS
5.2.3.5 RSSI
1. Select the RSSI Cal page.
2. Set the Signal Generator for a RF output level of –90dBm and 2kHz deviation at the specified
frequency.
3. Activate the Store RSSI button.
The receiver RSSI threshold setting is calibrated.
4. Monitor the battery voltage at the simulated battery terminals with an accurate multimeter.
5. Adjust the power supply so that the voltage reads exactly 7.2V ±5mV.
6. Click the Battery button to store the calibration.
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2.3.6 Tx Power
1. Select Tx Power/Mod page.
2. Select Channel 0.
3. Select the 0.5W power level.
4. Press the PTT button.
5. Adjust the Tx Final Value slider for a power output of 0.5W.
6. Repeat step 5 for the remaining 3 Channels (1, 2, & 3).
7. Select the 1W power level.
8. Adjust the Tx Final Value slider for a power output of 1W.
9. Repeat step 8 for the remaining 3 Channels (2, 1& 0).
10. Select the 5W power level.
11. Adjust the Tx Final Value slider for a power output of 5W.
Note that the supply current is less than 2.5A.
12. Repeat step 11 for the remaining 3 Channels (1, 2, & 3).
13 Press “Calibrate TX PA Current” button to automatically set the maximum current limit.
14 Release the PTT button.
Page 5.12 6 ~ CIRCUIT DIAGRAMS
5.2.3.7 Modulation
1. Select Tx Power/Mod page.
2. Select Channel 0.
3. Select the 0.5W power level.
4. Set the microphone input signal from the Audio Generator to 1000Hz at 100mV RMS.
5. Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz
6. Reduce the microphone input level to 10mV RMS and check that the deviation is within the range
±1.25 kHz to ±1.75 kHz.
7. Repeat steps 2 to 7 inclusive for the remaining 3 Channels (1, 2, & 3).
8. Remove the microphone audio input signal.
9. Select the Generate Square Wave function.
10. Select PTT and, while viewing the de-modulated signal on the transceiver test set oscilloscope,
adjust the Modulation Balance slider for the best square wave symmetry.
Note. DC coupling is required on the scope for optimum setting accuracy.
11. Repeat steps 8 to 11 inclusive for the remaining 3 Channels (1, 2 & 3).
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
5.2.3.8 Programming
When all channels have been aligned the radio is programmed with the new alignment data:
1. Select Align and choose Write Alignment.
2. A warning message is displayed.
3. Choose Yes.
New alignment data is written to the radio.
5.2.3.9 Customers Radio Configuration Data
If the Customers Radio Personality Data was saved as a separate file, use the FPP Programmer to write this
data to the radio.
Page 6.14 6 ~ CIRCUIT DIAGRAMS
6. REPLACEABLE PARTS
The parts listed in this section are considered to those most likely to need replacement due to physical
damage to the radio.
Figure 6-1 Replaceable Parts
6.1 COMMON PARTS
Ident Description Quantity per
Assembly Part Number
ACTUATOR PTT BLACK 1 6102 310 00131
ACTUATOR SIDE KEY B BLACK 1 6102 310 00121
ACTUATOR SIDE KEY A BLACK 1 6102 310 00111
CLIP RETN LOUDSPEAKER 1 3513 900 62202
CLOTH LOUDSPEAKER 1 3513 900 62161
CLOTH MIC 1 3513 900 62261
CONTROL VOL/ON-OFF 1 3513 993 51504
FLEXI-CIRCUIT MIC/SPKR 1 3513 908 02891
FLEXI-CIRCUIT TOP CTL 1 3513 908 02884
FRONT CASE ASSY GRAPHIC LCD SRP9100 1 6102 350 00111
FRONT CASE ASSY COMPLEX SRP9100 1 6102 350 12081
FRONT CASE ASSY SIMPLE SRP9100 1 6102 350 12091
GASKET LCD 1 3513 902 10442
INSULATOR JACK 1 3513 902 50331
JACK TWIN 1 3513 993 08002
KEYPAD COMPLEX (keypad 9130) 1 6102 310 00141
KEYPAD SIMPLE (keypad 9120) 1 6102 310 00151
KNOB ASSY 1 6102 350 12371
LABEL FRONT 1 6102 303 00021
LOUDSPEAKER 16R TO36S23 1 3513 993 55004
MIC ELECTRET JL-0627B1033-5830 1 6102 640 00011
MMI ASSY ALPHA/NUMERIC 1 6102 350 12341
RETAINER TOP ASSY 1 3513 906 40272
RETAINER MIC 1 3513 905 60541
SEAL TWIN JACK (for accessory jacks) 1 3513 905 82561
SEAL ACTUATOR 1 3513 905 81791
SEAL LOUDSPEAKER 1 3513 905 81801
SEAL CHASSIS 1 3513 905 81811
SEAL O-RING KNOB 1 3513 905 60671
SEAL TOP 1 3513 905 81852
SRP9100 Brief User Guide 1 TNM-U-E-0046
SUPPORT SWITCH TOP ASSY 1 3513 905 81783
WINDOW LCD SRP9100 1 6102 310 00101
WINDOW GRAPHIC LCD SRP9100 1 6102 310 00111
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
6.2 ACCESSORIES
Description Part Number
ACCESSORY CORD STRAIGHT (UNTERMINATED) SRP9100 PA-LDST
ANTENNA HELICAL E0 BAND (66-88 MHz) SRP9100 PA-AHE0
ANTENNA HELICAL HIGH PERFORMANCE E0 BAND (66-88 MHz) SRP9100 PA-AHE0-HIGH
ANTENNA HELICAL AC BAND (136-174 MHz) SRP9100 PA-AHAC
ANTENNA HELICAL K1/KM BAND (174-245 MHz) SRP9100 PA-AHAK
ANTENNA WHIP R1 BAND (335-375 MHz) SRP9100 PA-AWR1
ANTENNA HELICAL TU BAND (400-480 MHz) SRP9100 PA-AHTU
ANTENNA HELICAL UW BAND (440-520 MHz) SRP9100 PA-AHUW
ANTENNA WHIP TU BAND (400-480 MHz) SRP9100 PA-AWTU
ANTENNA WHIP UW BAND (470-520 MHz) SRP9100 PA-AWUW
BATTERY SRP9100 NICAD 1.6AH PA-BATH
BATTERY SRP9100 NIMH 2.1AH PA-BATN
BATTERY SRP9100 NIMH 2.7AH PA-BATB
BATTERY SRP9100 LITHIUM 3.0AH PA-BATL
EXTERNAL ANTENNA CONNECTOR PA-CON
LEAD PROGRAMMING SRP9100 PA-PRLD
Page 6.16 6 ~ CIRCUIT DIAGRAMS
APPENDIX A - ACCESSORY CONNECTOR
The following table details the connections on the accessory connector.
Connection Signal Name Use Signal type Direction
2.5mm Tip MIC1 Multi-function, audio in,
ancillary type voltage
and key press voltage.
0-5V To Radio
2.5mm Ring EXT_LS1A Balanced Speaker Drive Nominal Mid Supply To Accessory
2.5mm Sleeve EXT_LS1B Balanced Speaker Drive Nominal Mid Supply To Accessory
3.5mm Tip RXD1_IN RS232 RxD in or IIC
SDA or trickle charge
input.
0V to 5V
0V or –12V Space
5V or +12V Mark
Bi-directional
3.5mm Ring TXD1_OUT RS232 TxD out or IIC
SCL or 5V supply output
(50mA maximum.)
0-5V To Radio
3.5mm Sleeve 0VA Ground 0V To Accessory
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6 ~ CIRCUIT DIAGRAMS
TNM-M-E-0012 Issue 1.23
APPENDIX B - ACCESSORIES
Lapel Speaker Microphone
Figure 2 Lapel Speaker Microphone
Introduction
The lapel loudspeaker / microphone is a robust, lightweight, unit with an integral press-to-talk (PTT) switch
and a headset socket. The unit connects to the portable radio via a 1.5m ‘curly’ cable with a 2.5mm (J1) and
3.5mm (J2) stereo jack plugs mounted in a single moulding.
Specification
Maximum circuit current 10mA
Type Electret
Impedance 2kΩ (nominal)
Sensitivity –64dB ±4dB at 1kHz (0dB = 1V / µbar).
Sensitivity variation relative to 1kHz over
frequency range Less than +10dB, –2dB, 300 Hz to 4kHz
PTT switch Push to transmit
DC voltage overshoot during switching periods Within 2% of nominal voltage
PTT ‘click’ suppress circuit:
DC voltage establishment time for active PTT
voltage Less than 5ms to reach 95% of the nominal PTT
DC voltage established time for PTT release 50ms ±20% to reach 95% of the nominal PTT release
voltage
Loudspeaker
Impedance 16Ω ±2Ω
Power rating 0.3W nominal, 0.5W maximum
Page 6.18 6 ~ CIRCUIT DIAGRAMS
Headset socket 3.5mm - loudspeaker disconnected when jack inserted
Environmental:
Operating temperature range –20°C to +55°C
Storage temperature range –40°C to +80°C
Figure 3 Lapel Speaker Microphone Circuit
OPERATION
Ancillary Type
R3 defines the ancillary as a Lapel Speaker / Microphone.
Microphone
The microphone connects to the radio via the tip of the 2,5mm stereo jack (J1) and is powered via the ring
and sleeve of the 3.5mm stereo jack (J2) on the cord assembly.
When the Lapel Speaker / Microphone is connected to the radio, the radio’s microphone is switched out of
circuit.
Operation of the PTT switch brings into circuit the Electret microphone, which is powered from a rectified
and filtered DC supply from the radio. R5 is used to generate a PTT interrupt to the radio.
Speech is superimposed onto this voltage on using the microphone with the PTT switch pressed.
Loudspeaker
The loudspeaker connects to the radio via the ring and sleeve of the 2.5mm stereo jack (J1) on the cord
assembly.
When the Lapel Speaker / Microphone is connected to the radio, receive audio is routed to the ancillary
loudspeaker and not to the radio’s.
The Lapel Speaker / Microphone supports the use of a remote headset.