Simoco Wireless Solutions SRP9100TU, SRP9100AC, SRP9100UW SERVICE MANUAL

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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

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 G

1.2 S

1.3 D

1.4 P

1.5 S

1.6 A

1.7 S

2. SERVICE PHILOSOPHY...............................................................................................................2.29

2.1 SERVICE CONCEPT......................................................................................................................2.29

2.2 W

ENERAL COPE ESCRIPTION RODUCT VARIANTS AND FACILITIES OFTWARE VERSIONS AND NAMING

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 Ve rsions .......................................... ........................................... ......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

DJUSTMENT AND ALIGNMENT PECIFICATION

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

1.7.5 Environmental...................................................................................................................1.28

2.2.1 Service Within and Out Of Warranty ................................................................................2.29

2.2.2 Ancillary Items ..................................................................................................................2.29

....................................................................................................................................1.13

........................................................................................................................................1.13

..............................................................................................................................1.13

...........................................................................................1.14

.............................................................................................1.16

.....................................................................................................1.20

............................................................................................................................1.20

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

ARRANTY

.................................................................................................................................2.29

2 ~ SERVICE PHILOSOPHY

Page 1.1

2.3 S

3. DISASSEMBLY.............................................................................................................................3.30

4. TECHNICAL DESCRIPTION...........................................................................................................4.1

4.1 RECEIVER.....................................................................................................................................4.1

4.2 T

4.3 F

4.4 CONTROL .....................................................................................................................................4.7

4.5 M

4.6 P

4.7 K

5. ALIGNMENT (LEVEL 3 SERVICE ONLY)......................................................................................5.1

5.1 T

5.2 T

6. REPLACEABLE PARTS...............................................................................................................6.14

OFTWARE POLICY

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

RANSMITTER

4.2.1 Drivers and PA Stage s ............................................................................ ...........................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

REQUENCY SYNTHESISER

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

4.4.1 DSP and PLA .....................................................................................................................4.7

4.4.2 DSP Clock Oscillator ..........................................................................................................4.7

4.4.3 PLA PWM...........................................................................................................................4.7

EMORY

.......................................................................................................................................4.8

OWER SUPPLIES

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 U904 E/F............ ...............................................................4.9

4.6.2.6 Switched Battery ....................................................................................................4.9

EYBOARD AND DISPLAY

EST EQUIPMENT EST SET-UP

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

.....................................................................................................................2.29

...............................................................................................................................4.3

............................................................................................................4.5

.........................................................................................................................4.8

(MMI) ..................................................................................................4.10

..........................................................................................................................5.1

................................................................................................................................5.3

Page 1.2

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6.1 C

6.2 A

A. ACCESSORY CONNECTOR....................................................................................................................... A1

B. ACCESSORIES............................................................................................................................................B1

OMMON PARTS CCESSORIES

.........................................................................................................................6.14

.............................................................................................................................6.15

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.

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 omission s 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/

2 ~ SERVICE PHILOSOPHY

Page 1.3

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

Page 1.4

2 ~ SERVICE PHILOSOPHY

Warnings and Cautions

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.

SRP9100 radio equipment is to be connected to TMC approved chargers and accessories only.

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.

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

alignment data for the radio (DAC settings for Tx power, front-end tuning etc).

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Page 1.5

GLOSSARY OF TERMS

A summary of common radio terms and some ot he r 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 AFC AGC Alarm

ANN

ANI Auto Interrogate Automatic Power

Background Hunting

BCAST

Analogue to Digital Converter. Automatic Frequency Control. Automatic Gain Control. A Selcall sequence sent from subscriber equipment to indicate an Emergency

situation. When activated the radio will ent e r a repeating sequence consisting of an Alarm

Live Transmit Time and an Alarm Dead Receive Time. Abbreviation for Algorithmic Networ k Number ing . Th is is th e nu mb er ing system

where the numbers presented to the rad io 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.

Automatic Number Identification. An Acknowledge identity sent as a response to an in dividual reset call. 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.

The searching for an alternative and 'better' control channel whilst already on a valid control channel.

MPT1327 broadcast message. Used to transmit information about the trunked radio system to radio units.

Busy

C4FM Call Back

CCSC Channel Spacing CHEKKER

Page 1.6

The state of a channel such that:

• For a non-signalling channel - if Busy this mea ns th at 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 cor rect 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 Distu rb' 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.

Compatible 4-Level Frequency Modulation. A request, sent by the dispatcher, to a unit requesting that the unit calls the

dispatcher back. Control Channel System Codeword. The distance (in Hz) between the defi ned frequency channels. 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 overrid de n by the TSC depending upon the setting of TSCLIM.

CLIME Closed

CODEC Community Repeater

Continuous

Control Channel

Control Channel Burst

CRU CTCSS

Emergency Call Limit Timer. A state where transmit and receive are no t a llow ed unt il a S el call 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 I n hib it would be enabled.

COde (Analogue to Digital Converter) / DECode (Digital to Analogue Converter). A communications set-up whereby different groups of radios can operate by using

only one base station. This is achieved b y 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 radio s in th eir group. Only one group of radios can use the base station at any one ti me.

A continuous control channel is one that is only used by one site. There are no breaks in the transmission of signalling. Emerge ncy Call Time Limit

A channel used for the transmission of messages that enables the TSC to control radios. Control channels may either Continuous or Timed Shared.

A feature that enables control channel bu rst transmissions on systems using timeshared control channels. It is unavailabl e if the control channel acquisition type is not 'Time Shared'. To make available: go to Control Channel Acquisition Type and set to Time-shared.

Central Repair Unit 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 allow s sev era l different networks to use the same frequencies. CTCSS is also known as Tone Lock or Tone Squelch.

DAC Dash (-) digits DCS

Decode

Demanded

Disabled

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Page 1.7

Digital to Analogue Converter. Digits known as 'No Tone' digits used in Selcall Id en tities. Digital Coded Squelch system is based on sendin g a co ntinuous stream of binary

code words using, low deviation, direct fr eq ue ncy 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 select e d re ceiv e rs on ly and allows several different netw orks to use the same frequencies.

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 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).

The 'False' state of a parameter. That indicates this parameter is not ac tive. Typically this state is represented by an unmarked check box. Compare with Enabled.

DSP

Digital Signal Processor.

DTMF

Dual Watch

Economiser

Enabled

Encode

ETS Fallback

FFSK

Fleet

Abbreviation of Dual Tone Multi-Frequ en cy signalling. Used to dial into Telephone networks using tone dialling.

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.

A process by which the Receiver is powered down whilst there is no received signal. Periodically the receiver is powered up to che ck fo r such a sign al. This is used to extend the battery lif e o f a Portable.

The 'True' state of a parameter. That indicates this parameter is active. Typically this state is represented by a mark (ei th er a tick or a cross) in a check box. Compare with Disabled.

Transmission of signalling. Either Selcall where Selcall tone digits are encoded into tone frequencies or CTCSS/DCS where ton es modulated onto the channel's carrier.

European Technical Standard. A mode of operation that may be en te red when the Network is suffering a

malfunction. During this mode certain facilities (e.g. PSTN) may not be available. 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.

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

PLA FPP Hash (#) digits

IDENT

Identity

Idle State Inaccessible

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 pa rt y is not present to deal with the call.

Programmable Logic Array. Field Personality Programmer. 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.

A 13 bit number used for Identification purposes. Associated with a Prefix (PFIX) this forms a 20 bit address which is used for identification purpos es in signalling between the radio and the trunking system.

Name given to a sequence of tones that is used in sequential tone signalling. See Valid Selcall Digits.

The state of the radio when it is not in a call. 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

Page 1.8

These types of calls are used to allow a 3rd party to join into an existing call.

2 ~ SERVICE PHILOSOPHY

Link Establish Time

that allows for the finite del ay of the radio equipment in responding to any radio

A delay incorporated into the start of every selective call or DTMF transmission signal. This includes both the commencement time of the originating transmitter

and the response time of the receiver.

Locked

MEP Modifier

MPT1327

MPT1343

Noise Blanker NDD

Null Id Open

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.

Miniaturisation Extent Parameter. Used in systems that use ANN numbering. 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).

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.

A System Interface Specification for commercial Trunking networks. Defined for systems in the UK but also used outside the UK. Issued January 1988.

A circuit designed to reduce automotive ignition inte rference. Network Dependent Data. This is a field within the CCSC codeword that is used by

the trunking system to identify info rma tion about the trunking network and, in particular, information specifi c to t he site that is radiating the control channel. It is used by the radio when it is acquiring a control channel to identify valid channels.

A Selcall identity that is not defined and whose tones' field is displayed as a blank. A state where transmit and receive are allo we d. 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 PABX Password

PFIX

PLL PMR Priority Channel PSTN PTT

PTT Inhibit

PWM Queuing

Network Operator Identity used in Reg i o na l Systems. See Roaming. Private Automatic Branch Exchan ge . An optional password system available on th e ra dio . This feature is only available

if the radio does has a display and a keypad. To ma ke a vailable: go to Hardware Components, Terminal Settings and set Product Type to one which has a display and a keypad.

The 7 most significant bits of an MPT1327 addr ess nu mb er. Normally same fleet units have same prefix. Relates to individual and group ad dress numbers.

Phased Locked Loop. Private Mobile Radio (not normally tru nked). A channel in a search group that is scanned be tween every other channel. Public Switched Telephone Network Press To Talk. This is the term given to the operator’s key normally used to

commence transmitting a message. A state whereby transmission using the PTT is no t a llow ed . Also know as Tx

Lockout. Pulse Width Modulation The storing of a Selcall Identity for later transmission.

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Page 1.9

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 qu eu e 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

Registration

Repeat Tone

Reset

Roaming

Normally this is generated from a high stability crystal oscillator reference and is divided digitally in a fre qu ency synthesiser for comparison with other frequency sources, e.g. a VCO.

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 th e wh ole system for the called radio.

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'. Resetting is caused by Three Tone Reset, a Remote Reset, and an Individual

reset or a Group reset (Call Types in Dec ode 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 op tionally 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.

This is a process that allows changing between regional trunking systems which have different Operator Identities (OPID 's). Not allowed on MPT1343 Systems.

RSSI Scanning

SDM Selcall

Selcall Mute Selcall System

SFM Sidetone

Page 1.10

Received Signal Strength Indicator. 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.

Short Data Message. Selective Calling - a system of signalling which allows 'dialling up' of specific

mobiles, portables and controllers. Such a system may b e use d 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.

A state of the audio gate whereby the loudspeaker is muted (closed). Sel

ective Calling, uses a tone sequence at the start, and end, of a call to con tr ol

which members of a fleet react to the transmission. Short Form Memory. Sidetone is the audio which can be (optionally) heard when Selcall, DTMF and

toneburst transmissions are made.

2 ~ SERVICE PHILOSOPHY

Simplex

Mode of operation whereby the radio operates as a conventional fixed channel radio outside the Trunking network.

Squelch

Star (*) digits

Status

SW SYS

System used to prevent weak, unintelligible signals and random noise from being heard by a radio operator while still all owin g in t elligible 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 t o be enabled, with the result that only satisfactory signals are received. The squelch lev el is specified in SINAD.

Digits known as Status or Message digits. These digits are used for three purposes:

• Status Digits for Selcall Identities

• Wil dcard d i git s in Status strings

• Use in DTMF dia lle d strings - their use is network dependent to access special

services. 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 digi ts are looked up in a table (Status Menu) for possible messages to display.

Software. System Identity Code part of the CCSC.

TCXO Temporary

Three Tone Reset

Timed Reset

Time Shared

Temperature Compensated Crystal Oscillator. Temporary Registration; a process carried o ut 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.

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.

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.

A time-shared control channel is one tha t is used by more than one site. This allows a wide coverage area to be obtain ed usin g only one frequency.

The forward channel from the TSC to the radio is di v i de d in to 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.

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Page 1.11

TMR

Trunked Mobile Radio.

Tone Burst

Transpond TRAXYS

TSC

Tx Inhibit

UMP

User Defined Groups

User Identity

An audio tone is transmitted at the start of transmission to inform a relay (repeater) station to switch itself on to relay th e transmission.

An Acknowledge identity sent as a response to an in dividual call. Air Interface for the PTT Telecom Trunked Rad i o Ne twork, used in the

Netherlands. Trunking Site Controller. Central control required for the Trunking System to

function. Controls base stations. A facility which prevents the user from transmitting,( other than alarms), while the

channel is Busy. User Memory Plug. A special device that contains the customisation data for the

radio. If this is removed then this can cause th e ra dio to behave in a number of ways.

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 a t switch off unless 'Save Groups at Switch Off' is enabled.

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 Vote

Voting

VOX

Voltage Controlled Oscillator. Method used to compare the signal stren gth on a current channel with another

specified channel and then to choose the channel having the stronger signal. Feature used during searching when there is more than one channel that satisfies

the required conditions. It involves examining all th e channels that satisfy the required conditions, and then selecting the channel with the highest signal strength.

Voice Operated Transmit.

Page 1.12

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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 fun c tional variants. The variants are as follows:

Description PMR/Trunked

Portable Transceiver with no Keypad SRP9120 Portable Transceiver with Keypad SRP9130 Portable Transceiver with Keypad an d G rap hic Display SRP9130-Plus

1.2 SCOPE

This manual provides technical specifications, description and servicing details for the SRP9100 series of portable radio transceivers toget h er with the related accessories.

Unless specifically stated otherwise, the text and illustrations refer to all versions in the series.

1.3 D

The design concept utilises wide band analogu e t ech niques 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 tunin g and level adjustment.

A Digital Signal Processor (DSP) an d a Programmable Gate Array (PLA) are used with other dedicated devices in the SRP9100 to perform the following fu nctions 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, limi ting, compression, muting, CTCSS, Selcall or any other

• 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 ) bo ar d 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 plugin 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 additi o na l rig i dity when seated on the radio body.

ESCRIPTION

frequency or level dependent signal modification.

2 ~ SERVICE PHILOSOPHY

Page 1.13

1.4 P

RODUCT 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

Keypad - 12 button numeric keypad 12 button numeric keypad Display LCD 12 character with bit

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

Menu driven Yes

Customisable Menus Yes Yes Yes

can be customised.

mapped section and fixed icons.

66-88MHz, 136-174MHz, 174-208MHz, 335-375MHz,

Limited selections

7 Function keys. All keys can be customised

LCD 12 character with bit mapped section and fixed icons.

400-480MHz, 440-520MHz

10/12.5/20/25kHz

Yes Yes

7 Function keys . All keys can be customised

Graphic LCD 102 x 64 pixels.

Table 1-2 Conventional-PMR Variants

Feature: Model: 9120 9130/9130+

Channels Signalling Text Messaging

Attack Operation DTMF Encode

PTT Limit Timer with

200 1000 CTCSS / DCS Selcall/FFSK/DTMF CTCSS / DCS/Selcall/FFSK/DTMF FFSK test messaging display

Selcall status messaging Yes Yes

Pre defined Encodes via function keys Free form encodes via keypad

Yes Yes

FFSK text messaging display Selcall status messaging

Pre defined Encodes via function keys

warning beeps PTT Inhibit on Busy Scanning

Voting

Priority Scanning Nuisance Delete Multiax Phonebook P25

Yes Yes 100 groups with up to 15 channels per

group. Up to 50 groups consisting of up to 16

channels per group. Yes Yes

- Yes Yes Yes 250 entries 250 entries Optional Optional

240 groups with up to 15 channels per group. 4 user defined scan groups.

Up to 200 groups consisting of up to 16 channels per group.

Page 1.14

2 ~ SERVICE PHILOSOPHY

Table 1-3 Trunked Variants

Feature: Model: 9120 9130/9130+

Channels Frequency Bands Background Hunt and

1024 channels in 50 sub-bands Specifically: 136-174MHz, 400-450MHz (and possible in all other bands) Yes Yes

Vote-Now MPT1343 dial strings ANN Numbering Phonebook Memories User Phonebook Alpha Status List SDM/EDMs NPDs Attack Operation

Yes Yes Yes Yes 250 250 Recall entries configured by FPP only. Recall and edit. Yes Yes Yes Yes Yes Yes Yes Yes

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Page 1.15

1.5 S

There are various associated items of Software (SW) required for the SRP9100 radio and programmer to operate. This section simply defines the namin g ru le s of t h e SW file s 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 f or digital and analogue PMR, Trunking and Alignment.

OFTWARE VERSIONS AND NAMING

1.5.1

• 2 character Application code

• 2 or 3 character SW Type code

• 3 character version number

• File Extension as required.

eg.

91p_533.bin 91s_533.bin

1.5.2

This identifies the application the SW was initially designed for: 91 = Standard SRP9100 Software

1.5.3

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 numbe rs an d re le ase dates for the Backup, Startup, PMR, TMR and DMAP codes. The Bootloader, PLA Backup and PLA codes show release dates only.

Filename Structure

91tm533.bin

Application Code

Software Type Code

Page 1.16

2 ~ SERVICE PHILOSOPHY

1.5.4

This is a 3-digit number allocated by Engine ering to identify the SW version. eg. 103 = Version 1.03

Version Number

1.5.5

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

Each Transceiver SW code file (e.g. 91tm258.bin, etc.) contains version information about itself and possibly compatible Programming SW.

For

Exclusions

Displaying Software Versions

Radio SW saved on Disk

Options : Upgrade_Software : Get_File

, this information can be displayed via the Programmer function:

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Page 1.17

For

Software loaded in the radio

Programmer function:

Options : Radio_Information

, information can be read from the Transce iv er and displayed via the

The portable software version can be read from the portable display if required by accessing the menu and then choosing

1.5.7

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 recog nise a more recent revision of the radio, it is important that the latest FPP version is downloaded from http://www.tmcradio.com

YES

If NO is selected, only

It is strongly recommended to select “Yes” when this message is shown.

This process also updates the Start-up code to e nsu re it is comp atible with the loaded PMR or Trunk code.

Note: If the …\StandardFPP\RadioSW folder contains no files, then the above check will not be performed.

Automatic Version Upgrade Prompting

is selected, the Transceiver Radio code is updated before the new configuration is downloaded.

Radio Info

the configuration is downloaded.

and selecting the software version on the radio.

Set-up

Page 1.18

2 ~ SERVICE PHILOSOPHY

1.5.8

The SRP9100 Transceiver software is split into the following separate modules:

When the Transceiver starts, it basically performs the fo llo wing ste ps:

If the Mainline Software cannot b e lo aded, or a Job file configuration has not been loaded (e.g. non-exist e nt 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:

Transceiver SW Description, Start-up and Backup-Software

• Bootloader and Backu p Software

• Start-Up Softwar e

• PLA and PLA-Backup Software

• Mainline PMR Software

• Mainline Trunk Softwar e

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 do wnl oa ds t he PLA code (or PLA-Backup code if PLA checksum is bad) to the PLA device. If both PLA an d 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 execut ion to complete the power-up process and start normal operation.

• Mainline Trunk Softwar e or Main lin e PMR Software (normal power-up) If the radio does not have a vali d Jo b file configuration loaded, then it will display a “No PMR Cfg” or “No TMR Cfg” message.

• Start-Up Softwar e (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

A “WAILING SIREN” sound is emitte d 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 usin g 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

Note 2: Should these steps fail to restore the set and the Wailing Siren cease, the radio will need to be

Wailing Siren (Boot-up Software Corrupted)

to start-up in Backup Software. Thi s may be useful in some situations.

returned to a Level 3 Service Centre for FLASH replacement.

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Page 1.19

1.6

There are no internal adjustments in the SRP9100. Re-programming and alignment is performed using software tools. For testing, a special t est 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 prov ides access to audio in and out.

As the radio has no internal adjustments, t he re is no ne ed 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.

ADJUSTMENT AND ALIGNMENT

1.7 S

1.7.1 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

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

Radio excluding antenna 147mm

Weight

PECIFICATION

General

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

(mm)

Height Width Depth

68mm 43 mm

Excluding volume

control

Including std. battery

Page 1.20

2 ~ SERVICE PHILOSOPHY

Radio only Battery NiCad 1600mAH Battery NIMH 2150mAH 230g Battery Li 3000mAH 180g Battery NiMH 2700mAH 280g Antenna E0 30g Antenna UW 19g

Battery Endurance

Conformance Approvals

Pending in some cases

210g 250g

> 10 hours, high transmit power, 2700mAh battery, 90:5:5 duty cycle

ETS EN 300 086 * EN 300 113 * EN 300 489 * EN 300 219 * Australia AS4295 *

1.7.2 Power Output

Transmitter Rise Time

Duty Cycle

Spurious Emissions

Residual Noise

Audio Frequency Distortion Audio Frequency Response

Audio Sensitivity (PMR Mode 1kHz) (User programmable via FPP)

Transmitter

Any two levels programmable from High Power: 5W Adjustable down to 0.5W

Low Power: 0.5W Adjustable up to 5W Less than 40 ms

1 minute transmit: 4 minutes receive

< 0.25uW (9kHz to 1GHz) < 1.0uW (1GHz to 4GHz) 60% deviation. CCITT Weighted 25kHz Channel Spacing >45dB

12.5kHz Channel Spacing >40 dB ≤ 3% (at 60% deviation) 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) Accessory Connector: 5mV±2d B Internal Mic: 10mV±2dB

2 ~ SERVICE PHILOSOPHY

Page 1.21

1.7.3 Sensitivity

Adjacent Channel Selectivity

Intermodulation Rejection Spurious Response

Rejection Blocking Conducted Spurious

Emissions

FM Residual Noise (CCITT weighted)

Mute Range

Mute Response Time

Receiver ETS AS4295

≤0.5µV PD (-113dBm) for 20dB SINAD

25kHz Channel Spacing: >73dB

12.5kHz Channel Spacing: >60dB >65dB

>70dB

>95dB <2nW (-57dBm) - 9kHz to 1GHz

<20nW (-47dBm) - 1GHz to 4GHz

GENERAL

25kHz Channel Spacing: >45dB

12.5kHz Channel Spacing: >40dB Typically 6dB to 25dB SINAD

Typical setting 10dB to 12dB SINAD <30mS (no CTCSS)

Add 200mS for CTCSS

≤0.3µV PD (-117.5dBm) for 12dB SINAD ≤0.5µV PD (-113dBm) for 20 dB Quieting.

25kHz Channel Spacing: >73dB

12.5kHz Channel Spacing: >65dB >70dB

>73dB

>95dB <20nW (-47dBm) - 9kHz to 4GHz

Voting Response Time Audio Distortion Audio Frequency

Response

Deviation Sensitivity (For rated audio at 1kHz)

Searches at 50ms/channel 500mW into 16Ω at <5% distortion

300 to 3000Hz*: +1dB to -3dB Figures apply for a flat audio respon se or a 6d B/octave de-emphasis curve (*2550Hz for 12.5kHz channel spacing)

20% MSD±3dB

Page 1.22

2 ~ SERVICE PHILOSOPHY

1.7.4

1.7.4.1 CTCSS

All 38 standard CTCSS Tones are supporte d as pe r the table below.

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%

Signalling

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

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Page 1.23

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 minut e at 10 dB SINAD

False Decode Rate Less than 5 false decodes per min ut e (no carrier input) Talk-off For no dropouts in one minute, interfering tone at 90% of system deviation

Full quieting signal: 310H z 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 qu ieting/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

(CTCSS tone deviation 10% of system deviation. RF deviation 60% at 1000Hz).

(CTCSS tone at 10% of system deviation).

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, EI A

Page 1.24

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

2 ~ SERVICE PHILOSOPHY

Page 1.25

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 sec onds 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 i n 10 ms ste ps. Tx Hang Time, programmable: 0 – 9.99s in 10ms steps. Side-Tone in Loudspeaker: selectable via programmer.

Page 1.26

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 cod es – se e be low Turn off code 200ms 134Hz tone at PTT release

DCS Codes can be Transmitted “Normal” or “Inve rt ed ” (p ro grammable). 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 TI A/ EIA 102 requirements.

2 ~ SERVICE PHILOSOPHY

Page 1.27

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 Fig ur e 51 4.5C-1 Transit Drop 516.5 Table 516.5-V1 Functional Shock of severity 25g

Acceleration, 6ms pulse durat ion, 500 shocks in 6 directions.

Page 1.28

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 an d 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

2 Replacement of PCB or

mechanical component replacement, Cosmetic repair

3 Repair by PCB or mechanical

component replacement, Cosmetic repair.

Repair of Radio PCB to component level in CRU.

Antennas, Fuses Ancillaries

Listed in Level 2 Spares Schedule

Radio PCB components only available to CRU.

Multimeter P.C. Radio software Programmer As above + service aids and

test equipment

As above + service aids and test equipment

2.2 W

Initially, the normal 12-month warranty will apply to all radios and ancillaries.

2.2.1

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

All ancillary items are Level 1 service. These items should be replaced if f aul ty; t hey are non-re pairab le, and non-re turna ble t o th e CRU.

2.3 S

Software provided by TMC Radio shall remain the Company's property, or that of its licensors and the customer recognises the confidential n ature of the rights owned by the Company.

The customer is granted a personal, non-ex clu siv e, non-transferable limited right of use of such software in machine-readable form in direct connecti on wi th th e equipment for which it was supplied only.

In certain circumstances the customer may be req uir ed to enter into a separate licence agreement and pay a licence fee, which will be negotiated at the time of the contract.

ARRANTY

Service Within and Out Of Warranty

Ancillary Items

OFTWARE POLICY

2 ~ SERVICE PHILOSOPHY

Page 2.29

The customer undertakes not to disclose an y part of the software to third parties without the Company's written consent, nor to copy or modi fy 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 warrant y 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 warra nties, expressed or implied such, by way of example, but n ot 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 batte ry latch to release the battery. (2) Slide the battery down the radio t o dise ngage the retaining lugs. (3) Lift the battery away f rom 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 f i tted). (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.

2 ~ SERVICE PHILOSOPHY

Page 3.30

Remove the Metal Frame Assembly

(1) Use a small, flat bladed screwdriver to release th e cast metal frame assembly from the bottom of the

front casing. This action releases the radio PCB f ro m th e 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 fro m t he casing ). Caution: The loudspeaker / microphone flexicircuit connects the radio PCB (attache d 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 re tained 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.

2 ~ SERVICE PHILOSOPHY

Page 3.31

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 lug s) 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.

Page 3.32

Figure 4 Removal of MMI Assembly

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.

2 ~ SERVICE PHILOSOPHY

Page 3.33

4. TECHNICAL DESCRIPTION

4.1 RECEIVER

Refer to Figure 4-1. Description based on UW band

4.1.1

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 signa l to b e co upled thro ugh to th e receiver front- end with minimal los s. The ove rall inser tion loss of the harmonic filter and switch is approx imately 0.8dB.

A noise blanker is also fitted to E0 band ra dios. The noise blanker sample s the received signal and gates the 45MHz signal in the IF st age in the event that high level noise transien ts are received. Due to inherent time delays in the bandpass filters prior to the blanking gate, ga ting 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 fr equencies, which may be changed at any time without re-aligning the radi o.

To achieve the required varactor tuning range an arrangement of positive and negative bias power supplies is used to provide a total bias acr oss the varacto rs of up to 14.0VDC. A fixed 2.5V pos itive bias derived fr om 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 pass es through level shifting transistors Q404 to Q411 wh ere it is converted to a negative voltage in the range -0.5V to -1 1.5V. The -12.0V rail of the le vel translators is generated by U9 04D/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 pr ovides excellent intermodu lation and blockin g performance acros s the full operating range. The overall ga in of t he fr on t- en d is typically 14dB for all bands.

Front-End Filters and RF Amplifier

4.1.2

The output of the last front-end band pass 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 requ ired 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 band pass filter algorithm.

4.1.3

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 whe n 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.

First Mixer and IF Section

Quadrature Demodulator

3 ~ TECHNICAL DESCRIPTION

Page 4.1

VCO

Control Volts

CPP

RX VCO

Q600

VCO Buffer Q604/Q605

Synthesiser

Buffer Q607

SYNTH

to U701

4.1.4

RX VCO

Switch

RF Amp

TUNE_1, 2 , 3 & 4

To External

Accessory

Harmonic

Filter

L582-L585

RX_PSU

Antenna

Switch

D540, D541, D580

To TX PA From PLA

Bandpass

Filter

Figure 4-1 VHF/UHF Receiver Block Diagra m

Receiver Audio Processing

Q601

Q400

BandPass

SPKR_ON

Filter

D610/D611

Noise Blanker

E0 Only

AF Amp

U850

Speaker

Switch Q860,

Q861

TX/RX Switch

Mixer T400

IF Amp

Q401

RX AF Switch U302C

RX/Disc

AF Switch

U302B

4 Pole

45MHz IF

Filters

Z401A/B

ADC/DAC

Codec

U820

From PLA/DSP

TX MOD To TX

VCO / Phase

Modulator

90 MHz

VCO Q402

Demodulator

U400

Diff. Amp

U402

RX/TX

AF Switch U800A

ACK_LO2

TX_MODE

From PLA

AUX_CP

PWM AGC

Integrator

to U701

from U701

AGC

From PLA

Tx Audio

The base band audio from the IQ Demodu lator is applied to a differential amplifie r that cancels out DC offsets and converts the balanced demodulato r I/Q output signals to unbalanced inputs for the CODEC U820.

All receiver audio processi ng and filtering functions are perfor med by the CODEC under the contro l of the DSP. The receiver I and Q analogue bas eband signals are converted to dig ital 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 processi ng and volume contro l for narrow and wide band 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 pro vides an audio ou tput level of up to 500mW watts into th e 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 ra dio I/O connectors for option p urposes. Discriminator Audio is a preset level set by the FPP and is independent of squelch operation. Switch U302B can select either flat or deemphasised audio from the COD EC DA C U820 -24 . The selec ted audio is applied to the other half of the aud io amplifier U850-2 that drives the options connector audio after which it is routed to the portable’s options connector.

Page 4.2

3 ~ TECHNICAL DESCRIPTION

4.2 T

Refer to Figure 4-2.

RANSMITTER

4.2.1

The RF output level from the VC O T/R switch D611a is typically +8dBm. Tx buffers Q550/Q560 incr ease 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 dr ive power of approximately 17dBm (335-520MHz), 13dBm (136~245 MHz) 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 re lie d o n.

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 a ny 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 analog ue 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

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 pow er setting and co ntrol functions. Forw ard power is sa mpled by the power de tector 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 p owe r setting and is applied to the non-inverting input of the compara to r.

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.

Drivers and PA Stages

Power Control

4.2.3

The antenna changeover circuit con sisting of pin diodes D580/D540a/D541a, is s witched 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 o ff the diodes are reverse biased allowing the receiver input signal to rea ch the receiver front end with minimal loss. The harmonic rejection low pass filter comprises L582/L584/L585 and associated capacitors.

4.2.4

The internal microphone unit comprising an Electret microphone provides 10mV RMS (nominal) at the microphone input (INT_MIC) to provide ap proximately 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 wideban d 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.

3 ~ TECHNICAL DESCRIPTION

Page 4.3

Antenna Changeover and Harmonic Filter

Transmitter Audio Processing

To RX Mixer

LO1_RX

Power

Control

Comparator

U520A

Thermal

Shut Back

R532

Power

Control

Detector

D510

TX_PWR

Integrator

R308/C307

Antenna

Switch

Control

Q541/

Q542

PWM TX Power

Set from PLA

PA_ON

from PLA

TX_MOD

TX VCO

Q602

TX VCO

Switch

Q603

From PLA/DSP

ADC/DAC/

CODEC U820

VCO Buffer Q604/ Q605

Audio

Gate

U302-B

RX/TX AF

Switch U800A

TX_MODE

TX/RX AF Control

From PLA

TX/RX Switch

D610/ Q611

TX Buffer

Amp Q550/ Q560

Alert Tones to U850

DATA_EN

Internal MIC/ External

Audio Control From PLA

MOD_SW

Switch U800C

TX PA U500

Current

Sense

U520-B

Internal Micropone

External Accessory Audio

Directional

Coupler

TX_CURRENT

Figure 4-2 VHF/UHF Transmitter Block Diagram

Antenna

Switch

D580/ D540/ D541

TX Current Sense to PLA

13V8_UNSW From L8

Antenna

Filter L582/

L584/L585

Page 4.4

3 ~ TECHNICAL DESCRIPTION

4.3 F

REQUENCY SYNTHESISER

4.3.1

Refer to Figure 4-3. The frequency synthesiser consists of one transmitter and two receiver voltage controlled oscillators, loop

filters, varactor negative bia s generator, reference oscillator and an integrated dual phase locked lo op dev i ce U701.

4.3.2

The PLL device contains two prescalers, pro gr ammable dividers and phase comparators to provide a main and auxiliary PLL. The main PLL of U701 con t r ols t he fr equency 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 th e radio will switch back to receive mode. An unlocked signal in receive mode will cause the radio to beep.

4.3.3

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 provide d 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 v ia L oop Filter R433, R445, R464, C467, C493 and C702.

General

PLL

VCO’s

4.3.4

A positive and negative v ar act or bias supply similar to the front-end varactor arrangement has be en 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 th e DAC output of U701 (DOUT) with a level relative to the programmed sta te of the radio (eg. channel frequency an d 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 mu ltiplying effect needed to achieve -16V. The output of the neg at i v e supply is applied directly to the VCO varactor anodes as the negative tuning voltage VCAP BIAS.

4.3.5

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

- Divider U710 divid es t he 14.4MHz reference frequency down to 225kHz (VHF) or 450kHz (UHF).

3 ~ TECHNICAL DESCRIPTION

Page 4.5

Negative Bias Generator and Loop Filter

Phase Modulator

approximately 10Hz.

- Ramp generator Q711/Q712 provides a saw tooth outp ut, the slope of which is adjustable via the MOD_BAL line. This adjustment is set via a DAC output controlled from the Alignment

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 discharg es 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 car ried out usin g a CODEC gene rated 100Hz sq uare 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 -3 0° to +75°C.

Data From

DSP

Buffer Q710

SYNTH

CPP

CPPF

DOUT

PLL Loop

VCO Neg

Supply

14.4MHz

Reference

Oscillator

U700

Filter

Bias

Q700-

Q703

VCAP_BIAS

AFC

from PLA

RX/TX VCO Q600/ Q602

TX_MOD

ADC/DAC

CODEC

U820

VCO Buffer Q604/ Q605

Synth Buffer Q607

RX/TX Switch U800A

TX/RX Switch D601/

D611

LO1_RX

Internal

External

TX Audio

Switch

To IQ

Demodulator

U400

TX_MOD

MOD_BAL

Integrator

U711A

LO2

Ramp

Generator

Q711-

Q713

90MHz

VCO Q402

Phase

Modulator

Q714-

Q716

Divide 32 (UHF) Divide 64 (VHF)

Prog.

Divider

U710

AUX_LO2

AUX_CP

REF

Synthesiser

U701

To TX Buffer

To RX Mixer

Internal Mic.

External Audio

Page 4.6

Figure 4-3 VHF/UHF Synthesiser, Block Diagram

3 ~ TECHNICAL DESCRIPTION

4.4 C

Refer to Figure 4-4.

ONTROL

4.4.1

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:

DSP and PLA

• Channel set-up of all operating frequencies

• Modulation processing and filt ering

• De-modulation processing and f iltering

• Tx power output reference

• Modulation Balance adjustme nt

• Receiver front-end tuni ng

• Serial communications with alignment tool, microphone and control head

• Modem functionality for data modulation

• All signalling / CTCSS gener at i on an d 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

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

The PLA must supply several analogue signals to control radio tuning. It does this with several Pu lse Width Modulated (PWM) outputs.

The front-end tune signals (TUN E1- TUNE 4) o rig inate fro m the PLA in the for m of PWM sign als. The value s for these signals are s tored in flash memor y from radio a lignment and se lected d epending on th e channe l that the radio is currently tuned to. These signals are integrated by RC networks to provide the analogue tuning voltages that are ultimately app lie d 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.

DSP Clock Oscillator

PLA PWM

3 ~ TECHNICAL DESCRIPTION

Page 4.7

Analogue voltages to be monitored s uch as PLL Loop Voltage (LOOP_VOLTS) , k ey 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 increa se and the compar ator switches at the poin t where the input voltage exc eeds the ramp. The PLA compares the time that this occu rs with the PWM signal and converts it to a binary value.

4.5 M

EMORY

Memory consists of the internal DSP memor y and an external 8MB non-volatile Flash Memory U202. When power is off, all program SW an d data are retained in Flash Memo ry. At power-on, a boot prog ram downloads the DSP and PLA SW from Flash Memory to their interna l RAM’s for faster program execution an d access to data. PLA SW is loaded by the fac tory into the Flash Me mory and can be upda ted via the Alignmen t Tool. D SP SW comprises Start-up code that is also loaded by the factory. High-level SW comprising Operational Code and Customer Configuration are loa de d a t d i str ibution centres and are loaded via the FPP Programmer.

PWM

Outputs

Tune 1 - 4

AGC MOD BAL TX_Power

AFC FUNCTION_EN

Sampled Analog Inputs

LOOP_VOLTS EXT_SENSE

KEY_DET

TX_CURRENT VOLUME POWER_SENSE

BAT_SENSE

1. BACKLIGHT

Bit

Outputs

2. SPKR_ON

3. PA_ON

4. TX_MODE

5. LEDS

6. PWR_OFF

7. CHG_INH

8. SYNTH_FAST

Bit

9. ANALOG GATE CONTROLS

Inputs

1. PWR_ON

2. PTT

3. PWR_SENSE Serial port Serial port

BAT_SENSE

Clock

X200

Reset U200

Audio

DSP U201

CODEC

U800

XTAL_SHIFT

Audio

Flash

Memory

U202

Synthesiser

U701

LOCK

PLA

U300

RX_DATA TX_DATA

Figure 4-4 Controller Block Diagram

4.6 P

4.6.1

Power On Function

OWER SUPPLIES

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.

3 ~ TECHNICAL DESCRIPTION

Page 4.8

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

The following is a list of the SRP9100 power supplies and some of the devices and ci rcuits they supply.

4.6.2.1 5V Regulator U900

This regulator can be powered down by a STBY sign al from the PLA. Supplies RX_PSU and TX_PSU are switched via Q903 and Q904. Circuits supplied by U900 are as follows.

4.6.2.2 5V Regulator U901

Power Supplies

• Synthesiser reference oscillator, divider and phase modulator

• VCO Varicap driver

• Switched RX PSU to VCO output switch

• Switched TX PSU to TX VCO enab le/Rx VCO disable

• Switched TX PSU to Transmit Buffer Amplifiers

• Switched RX PSU to Receive front end and mixer

• 90MHz local oscillator Q402

• 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 tuni ng drivers

• -12V Output (-12V) for Front end Varica p tuning drivers

4.6.2.6 Switched Battery

Transmit Power Amplifier

•

• Speaker Amplifier

3 ~ TECHNICAL DESCRIPTION

Page 4.9

4.7 K

EYBOARD AND DISPLAY (MMI)

Keypad Press Detection

Electronically, the keypad key s a re a rra nged in a matrix of 3 rows and 7 columns. The rows are driven directly by two pro cesso r po rt 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) A(20)

BLITE Backlight enable 0V OFF, 5V ON nLCD_CS Display enable 0V or 5V, active low nKEY_ROW 1-2 Local keypad enables KEY_DET3 Voltage proportional to key press 0V to 5V AF_PSU Supply 0VA Ground 0V nWR Write line(for future use) 0V write, 5V read

Eight lines, processor data Low duty cycle, display address

selection

0V or 5V 0V or 5V

0V or 5V, active low

5V nominal

Four function keys are located below t he di sp lay :

Legend Function M – + OK

Activate menu Scroll down through channels (or menu, if act ive) Scroll up through channels (or menu, if active) Confirm choice or action (ie. Enter).

The SRP9130 has 12 additional keys (supported by the daughter board) arranged as a DTMF keypad.

3 ~ TECHNICAL DESCRIPTION

Page 4.10

Figure 5 Keypad Layout

Backlighting

The LCD and keypad backlighting LED’ s, D9 04 to D918, are turned on by the processor port signal, BLITE, v i a driver TR909.

3 ~ TECHNICAL DESCRIPTION

Page 4.11

5. ALIGNMENT (LEVEL 3 SERVICE ONLY)

TNM-M-E-0012 Issue 1.23

This procedure is applicable to all versions of

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.

If the radio contains customer configuration data that must be retained, you Personality Programmer (FPP) software to read all radio configuration files and save them on to alternative media

before

When the Alignment is completed, use t he 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 pe rf ormed with the radio board installed in the chassis.

commencing the alignment procedure.

SRP9100

portable transceivers.

Caution

must first

use the SRM/SRP

5.1 TEST EQUIPMENT

1. Radio transceiver test set CMT, 52/82 or similar. Note. For alternative equipmen t, 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

6. Personal Computer 486 DX 66 or better.

7. SRM/SRP Alignment Tool Co mpu t er Software file

8. SRM/SRP Field Personality Programmer

(FPP)

9. SRP9100 Simulated Battery

10. Antenna Adaptor for Portable PA-ACON

P/N PA-RTIU

Operating system Windows 95 or later. Minimum RAM - 16MB. 5MB free hard disk space. Floppy drive - 1.44MB. Mouse and serial port required

Computer Software file

6 ~ CIRCUIT DIAGRAMS

Page

5.1

Zener 5v6

RxD In

TXD Out

330R 1%

2k7

DB9F

to PC

3.5mm

2.5mm

470u

25V

470u

25V

PTT

2k7

P1761

27k

1uF Bipolar

TX AF

RX AF

Out

680R16R

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.

Page 5.2

6 ~ CIRCUIT DIAGRAMS

5.2 TEST SET-UP

Communications Test Set

RX Audio

TX Audio

TNM-M-E-0012 Issue 1.23

Antenna

Accessory

Connections

To Power Supply

To PC Serial Port

Test Interface Box

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.

6 ~ CIRCUIT DIAGRAMS

Page

5.3

Go to the

The Select the Comms Port setting appropriate to the

configuration of your PC and choose (Usually COM1)

Options

Comms Setup

menu and choose

dialogue box is displayed.

Comms Setup.

Page 5.4

6 ~ CIRCUIT DIAGRAMS

TNM-M-E-0012 Issue 1.23

5.2.2

Radio parameters are to be aligned sequentially as detailed in this procedure.

3. The radio alignment data is read (indicated

Radio Preparation

At the Opening Menu, select the and choose

The

WARNING

Choose configuration and use the FPP soft war e t o read and save the data to a file.

Choose step 3.

by percentage bar) and stored. The test alignment data is downloaded into

the radio.

Prepare/Read Radio

is displayed.

if you want to save the

if you want to proceed and go to

Align Menu

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 set t ings 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.

6 ~ CIRCUIT DIAGRAMS

Page

5.5

5.2.3

Radio alignment must be done in the sequence detailed in the following paragraphs. This alignment assumes that the radio is functioning n orm ally.

5.2.3.1 VCO DAC Alignment

Alignment Procedure

Select the

Select alignment frequency to set the V CO loop filter value between 140 and 150.

Select each transmitter alignment freq ue ncy to set the VCO loop filter value between 140 and 150.

VCO DAC

Auto Align.

and then select

PTT

page.

The Synth DAC Rx slider will automatically adjust its value for each receiver

Auto Align

. The Synth DAC Tx slider will automatically adjust its value for

Page 5.6

6 ~ CIRCUIT DIAGRAMS

5.2.3.2 TCXO (Radio Netting Adjustment)

TNM-M-E-0012 Issue 1.23

Select the

Select

Adjust the channel (to be measured on the RF Test Set f req uency counter).

Mute/TCXO

PTT

TCXO

page.

slider to ensure that the transmit freq ue ncy error is within 50Hz for the selected

6 ~ CIRCUIT DIAGRAMS

Page

5.7

5.2.3.3 Rx Front End

1. Ensure that the TCX0 Alignment has been done before proceeding with this section.

Select the

Select

Set the Speaker audio should now be visible on the Scope. If required readjust the

level.

5. Set the Signal Generator to the Channel 0 carrier frequen c y , with a 1000Hz modulation signal, a deviation of ±2 kHz and an RF level of -90dB m .

Select

Select 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).

Rx Front End

Open Mute

Volume

Channel 0. Auto Align

slider to 15.

Page

Volume

slider to a suitable

Page 5.8

6 ~ CIRCUIT DIAGRAMS

5.2.3.4 Mute/Audio Balance Adjustment

Note. This adjustment has default set t i ng of 1000/2600 and should not need changing except for specific requirements.

TNM-M-E-0012 Issue 1.23

Select the

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.

Select

Select the

Set the will be muted.

Set the

7. Reconnect the RF input to the radio.

Adjust the

9. Reduce the Signal Generator output level by approximately 2dB (or by an amount equal to the

desired mute hysteresis level).

10.

Adjust the

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.

Adjust the Rx

14.

0V±10mV) and leave at this setting. Note. On revision 2 radios and higher, an additiona l

15.

For these radios, the more accurate setting, the DC voltag e at TP731 needs to be noted during Rx and adjusted by the

Audio Balance

Mute/TCXO

Mute Closed

Mute/TCXO

Squelch Open

Squelch Close

Squelch Open

Squelch Close

Audio Balance

page and select

and remove the RF input from the radi o

page

and

Squelch Close

slider to the fully right position.

slider to the right until the mute opens.

slider to the left until the mute closes.

DAC to achieve a minimum in the measured DC volt ag e (w ithin

Tx Audio Balance

DAC to give the same reading (to within 10mV).

Open Mute.

sliders to the fully left position. This ensures the receiver

DAC is defaulted to zero for normal setting. However, for a

Tx Audio Balance

DAC is also provided

6 ~ CIRCUIT DIAGRAMS

Page

5.9

5.2.3.5 RSSI

Select the

2. Set the Signal Generator for a RF output level of –90dBm and 2kHz deviation at the specified

frequency.

Activate the The receiver RSSI threshold setting is calibrated.

4. Monitor the battery voltage at the simulated battery terminals wi th an accurate multimeter.

5. Adjust the power supply so that the voltage reads exactly 7.2V ±5mV.

Click the

RSSI Cal

Store RSSI

Battery

page.

button.

button to store the calibration.

Page 5.10

6 ~ CIRCUIT DIAGRAMS

5.2.3.6 Tx Power

TNM-M-E-0012 Issue 1.23

Select

Tx Power/Mod

Select

Channel 0

Select the

Press the

Adjust the

6. Repeat step 5 for the remaining 3 Channels (1, 2, & 3).

Select the 1W power level.

Adjust the

9. Repeat step 8 for the remaining 3 Channels (2, 1& 0).

10.

Select the 5W power level.

11.

Adjust the 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

0.5W

button.

PTT

Tx Final Value

PTT

page.

power level.

slider for a power output of 0.5W.

slider for a power output of 1W.

slider for a power output of 5W.

button.

6 ~ CIRCUIT DIAGRAMS

Page

5.11

5.2.3.7 Modulation

Select

Tx Power/Mod

Select

Channel 0

Select the

4. Set the mic rophone input signal from the Audio Generator to 1000Hz at 100mV RMS.

Adjust the

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.

Select the

10.

Select adjust the

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).

0.5W

VCO Modulation Limit

Generate Square Wave

and, while viewing the de-modula ted signal on the transceiver test set oscilloscope,

PTT

Modulation Balance

page.

power level.

slider for a maximum peak deviation of ±2.3kHz

function.

slider for the best square wave symmetry.

Page 5.12

6 ~ CIRCUIT DIAGRAMS

5.2.3.8 Programming

TNM-M-E-0012 Issue 1.23

When all channels have been aligned the radi o is pr og ra mmed with the new alignment data:

Select

2. A warning message is displayed.

Choose New alignment data is written to the radio.

Align

and choose

Write Alignment

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.

6 ~ CIRCUIT DIAGRAMS

Page

5.13

6. REPLACEABLE PARTS

The parts listed in this section are considered t o t ho se mo st 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

ACTUATOR PTT BLACK 1 6102 310 00 131 ACTUATOR SIDE KEY B BLACK 1 6102 310 00 121 ACTUATOR SIDE KEY A BLACK 1 6102 310 00 111 CLIP RETN LOUDSPEAKER 1 3513 900 62 202 CLOTH LOUDSPEAKER 1 3513 900 62161 CLOTH MIC 1 3513 90 0 62 261 CONTROL VOL/ON-OFF 1 3513 993 51504 FLEXI-CIRCUIT MIC/SPKR 1 3513 908 02 89 1 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

Part Number

Page 6.14

6 ~ CIRCUIT DIAGRAMS

TNM-M-E-0012 Issue 1.23

6.2 A

Description Part Number

ACCESSORY CORD STRAIGHT (UNTERMINATED) SRP 91 00 PA-LDST ANTENNA HELICAL E0 BAND (66-88 M Hz) 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-BAT H 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

CCESSORIES

6 ~ CIRCUIT DIAGRAMS

Page

6.15

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.

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.

3.5mm Ring TXD1_OUT RS232 TxD out or IIC SCL or 5V supply output (50mA maximum.)

3.5mm Sleeve 0VA Ground 0V To Access ory

0-5V To Radio

0V to 5V 0V or –12V Space 5V or +12V Mark 0-5V To Radio

Bi-directional

Page 6.16

6 ~ CIRCUIT DIAGRAMS

APPENDIX B - ACCESSORIES

Lapel Speaker Microphone

TNM-M-E-0012 Issue 1.23

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 Sensitivity –64dB ±4dB at 1kHz (0dB = 1V / µbar). Sensitivity variation rela tiv e to 1kHz over

frequency range 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

DC voltage established time for PTT release 50ms ±20% to reach 95% of the nominal PTT release

Loudspeaker

Impedance Power rating 0.3W nominal, 0.5W maximum

2kΩ (nominal)

Less than +10dB, –2dB, 300 Hz to 4kHz

Less than 5ms to reach 95% of the nominal PTT

voltage

16Ω ±2Ω

6 ~ CIRCUIT DIAGRAMS

Page

6.17

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 conn ected 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 o f a r emo te he adset.

Page 6.18

6 ~ CIRCUIT DIAGRAMS

Simoco Wireless Solutions SRP9100TU, SRP9100AC, SRP9100UW SERVICE MANUAL

Specifications and Main Features

Frequently Asked Questions

User Manual