LM LMC30051 User manual

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.. linear modulation technQ/ogy
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SERVICE ·MAN.UAL
. . . . .
'.
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F:,OR THE L ' M ' REPE~TJ:R SITE (BASE STAn .ON)
(25 WATT AND :· 100 ·· WATI)
. '" , "
Linear Modulation Mobiie&dio System
Advanced Pigit8J'Net-work,. Trunking .
Part ·Nos. LMC30051·mid:LMC30052
: . .
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,
, ~uricor "-lioco~ Umlted
.' Cross Keya Houae .. .
Westfield industrial Eatate .
Mldsomer Norton ... ..'; :. .
Bath BA3 4BS England .
Tel.phone [phone] .'
Fax +44 (0)17&1 41~1
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Publication Reference SM/02/1.2
December 1995 '
Printed in England

~ ________________ ' _ " _ ' _ ' _ ''' _-_ - '' _ ' : ' _ ' ~ ' _____________________ L_I_C_~_N_C_E
• DO NOT use this equipment near unshielded electrical blasting caps
or
in an explosive atm..Q~phere .
.,, _ .. ,_ .. .- .. ...
• The lOOW PA unitU~d30052) uses power transis~rs that contain
beryllium
oxid~ ,,; wh,ich is extremely toxic. The power transistors are
identified
as TR6 041:806:.2 and TR7 015106-2. .
In the unlikel~ . ev~nt : of.coniing into contact with beryllium oxide,
wash thoroughly with soap and water, if skin is broken obtain
medical attention. If eye. -cc;mtact, wash for 15 minutes with running
water including' under · the .eyelids, and seek medical attention.
Ifingested or fuh:EU ' ed~seek medical atten~ion immediately.
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Repairs, Modifications and ': Maintenance .
•
•
•
.: ' ~.
•• J. •
If any operational difficulties arise while using this product, report
them to autho~e~ . ~~ · . personnel as soon as possible.
This
system con~ rio-h~er serviceable pa.rts". Unauthorized
adjustments or modifications will void the warranty and may lead to
emissions outside FCC limits.
DO NOT connect an e~mal poweramplif'ier to this equipment.
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I, ' .
..! .. - ::' : ,:.. :...
: .\. .
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LICENC~ : 8ceON'fENTS -LM REPEATER SITE SERVICE MANUAL iii
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Q LMC30051/LMC30052 SPECIFICATIONS
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1. LMC30051/LMC30052 Specifications
The following specifications are intended for testing and servicing the
Repeater. Specifications are subject to change without notice.
1.1 General
Operating Mode
Frequency Range
Receive
Transmit
TransmitlReceive Separation
Channel Spacing
Channel Increment
Supply Voltage
Full Duplex
221-222 MHz
220-221 MHz
1 MHz
5kHz
2.5 kHz
240 VAC 110 V AC
Current Drain (typical, std test signal)
Transmit 25 W 0.34 A 0.70 A
1.52 A
0.33 A
Transmit 100 W 0.71 A
Receive 0.19 A
Temperature Range
Operational
Storage
Dimensions
Width
Depth
Height
Weight
Approvals
Audio Frequency Response
1.2 Receiver
Sensitivity
20dBSINAD
12dBSINAD
Selectivity
Intermodulation
Spurious and Image Rejection
Distortion
RF Input Impedance
Frequency Stability
-30°C to +55 °C
-40 °C to +85 °C
482mm
360mm
177mm
12.02 kg
(19.0")
(14.2")
(1.95")
(26.45Ib)
FCC
Part 15, 90
±0.75 dB, 300 Hzto 3 kHz
< -107 dBm, typically -112 dBm
< -115dBm
> 50 dB at 5 kHz
65 dB
70 dB
3%
50 n ,unbalanced to ground,
maximum VSWR 2:1
± 0.1 ppm
SECTION ONE -LM REPEATER SITE SERVICE MANUAL
1-1

LMC30051/LMC30052 SPECIFICATIONS
e
1.3 Transmitter
RF Output Power, Nominal
(Peak Envelope Power)
25W
100W
RF Output Power, Minimum
(Peak Envelope Power)
1W 4W
Spurious & Harmonic Emissions -61 dBc -67 dBc
(S 250 kHz from Channel
centre. Reference largest
in
channel signal in 100 Hz
bandwidth)
Spurious & Harmonic Emissions -69 dBc -75 dBc
(~ 250 kHz from Channel
centre. Reference largest
in
channel signal in 10 kHz
bandwidth)
Audio Modulation
4KOOJ3E
RF Load Impedance 50 n, unbalanced to ground
Frequency Stability :t 0.1 ppm
1.4 Frequency Standard
OutputLevel
3±2dBm
Input Level
0±10dBm
Frequency 10.000
MHz
Frequency Stability
:to.l ppm
1-2
SECTION ONE -LM REPEATER SITE SERVICE MANUAL

~ CONTENTS
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Contents
1. I...MC300511IMC30052 Specifications ............................................................ 1-1
1.1 General .................................................................................................. 1-1
1.2 Receiver .................................................................................................. 1-1
1.3 Transmitter ............................................................................................ 1-2
1.4 Frequency Standard .............................................................................. 1-2
2. In.troduction .......................................................................................................2-1
2.1 Scope of Manual ..................................................................................... 2-1
2.2 Definitions ............................................................................................. 2-1
2.3 Reference Documents ............................................................................ 2-1
2.4 Related Docu.ments................................................................................ 2-2
2.5 Equipment Description ......................................................................... 2-2
2.5.1 Channel Shelf.............................................................................................. 2-2
2.5.2 Frequency Standard................................................................................... 2-3
2.5.3 Combining System....................................................... .. ............................. 2-3
2.5.4 System Control Interface ......................................... .. .......................... .. .... 2-4
2.5.5 System Control and Monitoring................................................................. 2-4
2.5.6 System Options........................................................................................... 2-4
2.6 On-Site System Testing ......................................................................... 2-5
3. Linear Modulation .. ~ ........................................................................................ 3-1
3.1 Definition ............................................................................................... 3-1
3.2 LM Methods ........................................................................................... 3-1
3.2.1 TransparentTone In Band......................................................................... 3-1
3.2.2 Feed Forward Signal Regeneration........................................................... 3-1
3.2.3 Cartesian Loop ......................................................................................... ... 3-2
3.3 Transmission Process ............................................................................ 3-2
3.4 Cartesian Loop Linearisation of the Transmitter ................................ 3-4
3.5 Reception Process.................................................................................. 3-5
4. Advanced Digital Network TnJDking (ADN'r) ........................................... 4-1
4.1 Control Channel .................................................................................... 4-1
4.2 Call Setup and Clear Down ................................................................... 4-1
5. Controls, Indicators and Displays ................................................................ 5--1
5.1 System Control Interface ...................................................................... 5-1
5.1.1 The Keypad ................................................................................................. 5-2
5.1.2 On-Site Functions....................................................................................... 5-2
5.2 Power ..................................................................................................... 5-4
5.3 PA:LED .................................................................................................. 5-4
5.4 TCC :LEDs.............................................................................................. 5-4
5.4.1 Prl' ................................................. .. .......... ................................................. 5-5
5.4.2 CW LOCK (Code Word Lock)..................................................................... 5-5
5.4.3 TALK .............................................. .... .... ............................................. .. ...... 5-5
5.4.4 IN SERVICE............................................................................................... 5-5
5.4.5 SQUELCH................................................................................................... 5-5
5.5 TCC Display ........................................................................................... 5-5
5.5.1 Power Up Sequence .................................................................................... 5-5
5.5.2 Failure Codes .. .................. .. ........................................................................ 5-6
LICENCE & CONTENTS -LM REPEATER SITE SERVICE MANUAL v

CONTENTS ~
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5.5.3 Normal Operation (Control Channel) ....................................................... fH)
5.5.4 Normal Operation (Traffic Channel) ........................................................ fH)
5.6 TCC Internal Controls........................................................................... 5-7
5.6.1 S10 Bus Address ........................................................................................ 5-7
5.6.2 Channel Number ........................................................................................ 5-7
5.6.3 FFSK Output Level.................................................................................... 5-8
5.7 TCC Front Panel Controls..................................................................... 5-8
5.7.1 Squelch Level ............................................................................................. 5-8
5.7.2 FFSR Threshold Level............................................................................... 5-9
5.7.3 Pilot Pumping ............................................................................................. 5-9
5.8 Frequency Standard .............................................................................. 5-9
5.8.1 IntemallExtemal Select............................................................................ 5-9
6. In.s1;allation......................................................................................................... 6-1
6.1 Perfonnance Tests ................................................................................. 6-1
6.2 Power Supply......................................................................................... 6-1
6.3 Location ................................................................................................. 6-1
6.4 System Control Interface ...................................................................... 6-2
6.4.1 System Control Terminal (Syscon) or Central Computer ........................ 6-2
6.5 Channel Setup ....................................................................................... 6-3
6.6 Repeater Rack........................................................................................ 6-3
6.6.1 Frequency Standard ................................................................................... 6-4
6.6.2 Channel Shelves......................................................................................... 6-5
6.6.3 Earth Connection....................................................................................... 6-6
6.7 Combining Rack (optional).................................................................... 6-6
6.7.1 Cavity Alignment ....................................................................................... 6-6
6.7.2 Receiver Connections................................................................................. 6-6
6.7.3 Transmitter Connections........................................................................... 6-7
6.7.4 Antenna Connection .................................................................................. 6-7
6.7.5 Earth Connection...................................................:................................... 6-7
7. Operation........................................................................................................... 7-1
7.1 Power Up ............................................................................................... 7-1
7.2 Control Channel Selection .................................................................... 7-1
7.3 Squelch Setting ...................................................................................... 7-2
7.4 During a Call ......................................................................................... 7-2
8. Circ11it Description .......................................................................................... 8--1
8.1 Receiver.................................................................................................. 8-1
8.2 Exciter and Power .Amplifier................................................................. 8-2
8.3 Trunking Channel Controller ............................................................... 8-4
8.4 Power Supply Unit ................................................................................ 8-5
8.5 Frequency Standard .............................................................................. 8-5
~ S,Ystem Control Interface ...................................................................... 8-5
'--"" 8.6.1 Main Bo8l'd................................................................................................. 8-6
8.6.2 RAM Banks ................................................................................................ 8-6
8.7 The I2C Bus............................................................................................ 8-7
8.7.1 Commands.................................................................................................. 8-7
8.7.2 Responses ................................................................................................... 8-7
9. Commissioning .................................................................................................. 9-1
9.1 Range ..................................................................................................... 9-1
9.2 Transmission Losses ............................................................................. 9-1
9.3 Receiver Losses...................................................................................... 9-1
9.4 Reciprocity............................................................................................. 9-2
10. Simplified. On·Site Testing ........................................................................ 10--1
10.1 Test Equipment ................................................................................. 10-1
vi
LICENCE & CONTENTS -LM REPEATER SITE SERVICE MANUAL

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10.2 Frequency Reference ......................................................................... 10-1
10.3 Receiver Sensitivity Tests ................................................................. 10-2
10.3.1 Setting up the Equipment ...................................................................... 10-2
10.3.2 MeasuringReceiver Sensitivity............................................................. 10-2
10.3.3 Receiver Testing via Splitter/Amplifier................................................. 10-6
10.3.4 Returning Equipment to Operation....................................................... 10-6
10.4 Transmitter Tests .............................................................................. 10-7
10.4.1 Transmitter Testing, Direct Connection............................................... 10-7
10.4.2 Transmitter Testing, Connection via Transmitter Combiner.............. 10-8
10.4.3 Returning Equipment to Operation....................................................... 10-9
10.4.4 Carrier Wave Identification (CWID) ..................................................... 10-9
11. Comprehensive OD.·Site TestiD.g............•..................................................11-1
11.1 Test Equipment ................................................................................. 11-1
11.2 Frequency Standard .......................................................................... 11-1
11.3 Test Modes ......................................................................................... 11-1
11.3.1 Transmit Preamble................................................................................. 11-2
11.3.2 Transmitter Test Modes.........................................................................11 -2
11.3.3 Transmitter PowerAdjust ..................................................................... 11-2
11.4 Receiver Tests .................................................................................... 1 1-2
11.4.1 Connections............................................................................................. 11-2
11.4.2 mtimate SINAD Test............................................................................. ll-3
11.4.3 Sensitivity Test....................................................................................... 11-3
11.5 Transmitter Tests .............................................................................. 11-3
11.5.1 Connections............................................................................................. 11-3
11.5.2 SpectrumAnalyzer Set-up..................................................................... 11-3
11.5.3 Stability: Pilot Only Test ........................................................................ ll-4
11.5.4 Linearity: Two Tone Test....................................................................... 11-4
11.5.5 Image Suppression: OneTone Test .......................................................11-5
11.5.6 External Signal Test ............................................................................... 11-6
11.5.7 Adjusting TransDrit Power..................................................................... 11-6
12. ChaD.nel Freq,uencies .....................................................................•............. 12-1
13. Base Station 5·Channe125/100 W.............................................................. 13-1
14. System Controlln:terface ..............................................•............................ 14-1
15. 10 MHz Frequency sUndard. .................•.....•..........................•.................. 15--1
16. ChaD.nel Shelf 25 W/ 100 W......................................................................... 16--1
17. Power .Am.pli:fier 25 W.............•................•..................•...••........................... 17-1
18. Power .Am.pli:fier 100 W................................................................................ 18-1
19. TnJDkjng ChaD.nel Controller ................................................................... 19--1
20. Channel Receiver Unit ................................................................................ 20-1
21. Channel Exciter Unit ..................•................................................................ 21-1
22. 200W Power Supply Unit ............................................................................ 22-1
23.·400W Power Supply Unit ............................................................................ 23-1
LICENCE & CONTENTS -LM REPEATER SITE SERVICE MANUAL
vii

CONTENTS ~
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Amendment Schedule
Amendments to this manual will be issued to incorporate changes or detail additional
information.
Amended pages will be identified by the amendment date and number
shown at the foot of the page. Record incorporation of amendments to this manual on this
page.
If a new issue of this manual is made all amendments will be incorporated.
Date Amdt.No.
Date Incorporated Reason for Change
If you find any errors or omissions in this manual, or you have any suggestions for
improvements please
write to the address shown on the front of this manual.
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viii LICENCE & CONTENTS -LM REPEATER SITE SERVICE MANUAL

Q INTRODUCTION
~----~--
2. Introduction
2.1 Scope of Manual
This service manual contains installation, operation and service
information for
the Linear Modulation Technology Limited Repeater
Site. This manual applies to both 25 W (LMC30051) and 100 W
(LMC30052) equipment.
2.2 Definitions
ADNT
AGC
CCITT
CTU
DSP
DTMF
FFSR
FPU
12C
PABX
PSTN
PTI'
RFU
SCL
SDA
SDM1
SDM2
SINAD
SPU
TCC
TTIB
VSWR
Advance Digital Network Trunking
Automatic Gain Control
ConsultatifCommittee
Internationale Telephones et
Telecommunications (now ITU)
. Control
and Trunking Unit
Digital Signal Processor
Dual Tone Multiple Frequency
Feed Forward Signal Regeneration
Front Panel Unit
Inter-Integrated Circuit (bus).
Private Automatic Branch eXchange
Public Switched Telephone Network
Press To Talk
Radio Frequency Unit
Serial clock
Serial data
Short Data Message Type 1
Short Data Message Type 2
Signal/Noise
and Distortion
Signal Processing Unit
Trunking Channel Controller
Transparent Tone In Band
Voltage Standing Wave Ratio
2.3 Reference Documents
MPT1327 A Signalling Standard for Trunked Private and Land Mobile
Radio Systems (Radiocommunications Agency (UK».
MPT1343 System Interface Specification for Radio Units to be Used
with Commercial Trunked Networks Operating in Band ITI
and Sub-Bands 1 and 2. (Radiocommunications Agency (UK».
MPT1376 Co-existence Standard for Transmitters and Receivers
Operating
in 5 kHz Channels (Radiocommunications Agency
(UK».
SECTION TWO -LM REPEATER SITE SERVICE MANUAL
2-1

INTRODUCTION Q
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2.4 Related Documents
• LMM 3115 Mobile Service Manual (SM/01f2.0)
• SYSCON
Manual (TUl211.4)
• TrunkingTechnical Reference Manual (TU13/1.1)
2.5 Equipment Description
2-2
The Repeater Site is part of the LM trunked radio system which allows
mobiles to communicate using 5
kHz channel assignments. A modulation
scheme called
Linear Modulation is used, which is spectrally efficient
and provides a medium particularly suited to the varying propagation
effects (e.g.
multipath and Doppler) encountered in a typical mobile
environment.
The system is designed for speech and data use, with data
rates of 14,400 bits per second achievable.
The
repeater employs digital signalling and provides trunked operation
using
the Advanced Digital Network Trunking (ADNT) system, based on
the UK specification MPl'1327. The unit provides features such as
Status Calls, Call Queueing, Priority Calls, Data Calls, Emergency
Calls, Group Calls, Individual
Calls and Telephone Connection.
The system
is completely modular, allowing easy expansion from a
simple local system,
to a large multi-channel, multi-site network.
Channels
may be added or removed with the system 'live', and the
system will automatically re-configure itself to use the new equipment.
Up to 24 channels can be accomodated on a single site. Single site
installations
can be upgraded to multi-site by adding a Central Control
Computer.
Up to 10 sites can be linked in this way.
The system is fully automatic, and can operate unattended. It canbe
remotely controlled using a Control Terminal connected via a modem
and telephone line. Refer to the SYSCON Manual (TUl211.4) for details
of operation of the Control Terminal.
The Repeater Site consists of, as a minimum, the following equipment
mounted in standard 19 inch cabinets:
• Up to 24 Channel Shelves
• Frequency Standard (a minimum ofone per 5-channel rack)
• System Control Interface (SCI)
• Combining
and Duplexing System.
2.5.1 Channel Shelf
A channel shelf consists ofa two-frequency duplex radio channel which
provides base
to mobile communication and a talkthrough connection for
mobile to mobile, along with
trunking signalling and control. It operates
on
the 200 channels in the 220 MHz band (220-221 MHz repeater
transmit, 221-222 MHz repeater receive). It is a 4U high unit, consisting
of five modules which can be removed independently from the shelf.
SECTION TWO - LM REPEATER SITE SERVICE MANUAL