Tait T857 Manuals

Manuals and User Guides for Tait T857. We have 1 Tait T857 manual available for free PDF download: Service Manual

Tait T857 Service Manual

Tait T857 Service Manual (370 pages)

Base Station Equipment 400-520MHz

Brand: Tait | Category: Accessories | Size: 3 MB

Table of Contents

Part a Introduction to Servicing

13
- Table of Contents
  13
- 1 General
  
  15
- 2 Mechanical
  
  17
  - Torx Recess Head Screws
    17
  - Pozidriv & Philips Recess Head Screws
    18
  - Disassembly/Reassembly
    19
    
    Receivers/Exciters/Transmitters
    19
    
    Power Amplifiers
    19
  - Cover Screw Torques
    19
- 3 Component Replacement
  
  21
  - Leaded Components
    21
    
    Desoldering Iron Method
    21
    
    Component Cutting Method
    21
  - Surface Mount Devices
    22
  - Cased Mica Capacitors
    22
- 4 Software History
  
  23
  - Pgm800Win V1.0
    23
  - Pgm800Win V2.00
    23
T855 General Information

27
- T855 General Information
  
  29
- Introduction
  
  31
- Specifications
  
  32
  - Introduction
    32
  - General
    33
  - RF Section
    33
  - Audio Section
    35
  - General
    35
  - Ctcss
    35
  - Mute Operation
    36
  - Microprocessor Controller
    36
  - Test Standards
    36
  - European Telecommunication Standard (ETS)
    36
  - DTI CEPT Recommendation T
    37
  - Telecommunications Industry Association
    37
- Product Codes
  
  38
- Standard Product Range
  
  39
T855 Circuit Operation

41
- Introduction
  43
- T855 Circuit Operation
  43
- Receiver Front End
  44
- IF Circuitry
  45
- Mixer
  45
- Carrier Mute
  46
- Noise Mute (Squelch)
  46
- Audio Processor
  47
- Power Supply and Regulators
  48
- Microcontroller
  49
- Synthesised Local Oscillator
  50
- Vco
  51
- Received Signal Strength Indicator (RSSI)
  52
Title

54
- Audio Processor Links
  60
- General
  60
- Audio Processor Linking Details for CTCSS
  61
- Alignment of Receiver Front End and if
  62
- Synthesiser Alignment
  62
- Carrier Level Mute
  64
- Gating Delay
  64
- Noise Mute Adjustment
  64
- Audio Processor
  65
  - Line Amplifier Output
    65
  - Monitor Amplifier Output (Speaker Output)
    65
- Ctcss
  65
  - Decoder Operation
    65
  - Opening Sinad
    65
  - High Pass Filter
    66
- Rssi
  66
T855 Functional Testing

67
- Figure
  67
  - Current Consumption
    69
  - Sensitivity
    69
  - Switching Range
    69
  - Audio Distortion
    70
  - Ultimate Signal-To-Noise Ratio
    70
  - De-Emphasised Audio Frequency Response
    71
  - Noise Mute (if Linked In)
    72
  - RSSI (if Fitted)
    72
  - Carrier Level Mute (RSSI Fitted & Carrier Mute Linked In)
    73
Title

76
- Pgm800Win Generated Errors
  
  82
- Fault Finding Charts
  
  83
  - Microcontroller (IC810)
    83
  - Basic Checks
    83
  - Serial Communication
    84
  - CTCSS Decode
    85
  - Regulator
    86
  - Synthesiser
    87
  - Noise Mute
    90
  - Carrier Mute
    91
  - Receiver
    92
  - Audio
    93
T856/857 General Information

125
- Introduction
  
  131
- Specifications
  
  132
  - Introduction
    132
  - General
    132
  - RF Section
    133
  - Audio Processor
    134
  - Inputs
    134
  - Modulation Characteristics
    135
  - Ctcss
    135
  - Microcontroller
    135
  - Test Standards
    136
  - European Telecommunication Standard
    136
  - DTI CEPT Recommendation T
    136
  - Telecommunications Industry Association
    136
- Product Codes
  
  137
T858/859 Fault Finding

265
- General
  268
- PA Faults
  268
- Voltage Chart
  
  271
- Fault Finding Charts
  
  272
  - T858 Pa
    272
  - T858 Power Control
    273
  - T859 Pa
    274
  - T859 Power Control
    275
  - T859 Fan Control Circuitry
    276
- Removing the PCB from the Heatsink
  
  279
Part G System Configurations

323
- 1 T855 Link Selectable Features
  
  325
  - Flat or De-Emphasised Response
    325
  - Mute Selection
    325
  - Receiver Disable
    325
  - CTCSS Configuration
    325
  - 300Hz High Pass Filter
    326
  - Audio Processor Links
    326
    
    General
    326
    
    Audio Processor Linking Details for CTCSS
    327
- 2 T856/857 Optional Features
  
  329
  - Audio Processor
    329
    
    Link Details
    329
    
    Typical Options
    330
  - Line Transformer Inputs and Outputs
    330
  - Opto Key
    330
  - Relay Driver
    330
- 3 Talk through Repeater
  
  333
- 4 Line Controlled Base Without Talk through
  
  335
  - Transmitter Tail Timer
    336

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