Tait T885 Manuals

Manuals and User Guides for Tait T885. We have 1 Tait T885 manual available for free PDF download: Adjustment Manual

Tait T885 Adjustment Manual

Tait T885 Adjustment Manual (136 pages)

Base Station Equipment

Brand: Tait | Category: Accessories | Size: 1 MB

Table of Contents

Part a Introduction to Servicing

5
- Table of Contents
  5
- 1 General
  
  7
- 2 Mechanical
  
  9
  - Torx Recess Head Screws
    9
  - Pozidriv & Philips Recess Head Screws
    10
  - Disassembly/Reassembly
    11
    
    Receivers/Transmitters
    11
    
    Power Amplifiers
    11
  - Cover Screw Torques
    12
  - Chassis & Cover Compatibility
    13
- 3 Component Replacement
  
  15
  - Leaded Components
    15
    
    Desoldering Iron Method
    15
    
    Component Cutting Method
    15
  - Surface Mount Devices
    16
  - Cased Mica Capacitors
    16
- 4 Software History
  
  17
  - Pgm800Win V1.0
    17
T885 General Information

21
- T885 General Information B1.1
  22
- T885 General Information
  
  23
- Introduction
  
  23
- Specifications
  
  24
  - Introduction
    24
  - General
    25
  - RF Section
    25
  - Audio Section
    27
    
    General
    27
    
    Ctcss
    27
    
    Mute Operation
    28
  - Microprocessor Controller
    28
  - Test Standards
    28
    
    DTI CEPT Recommendation T
    28
    
    Telecommunications Industry Association
    29
- Product Codes
  
  30
- Standard Product Range
  
  31
T885 Circuit Operation

33
- Introduction
  35
- T885 Circuit Operation
  35
- Receiver Front End
  36
- IF Circuitry
  37
- Mixer
  37
- Carrier Mute
  38
- Noise Mute (Squelch)
  38
- Audio Processor
  39
- Power Supply and Regulators
  40
- Microcontroller
  41
- Synthesised Local Oscillator
  42
- Vco
  43
- T885 RSSI Block Diagram
  44
T885 Initial Tuning & Adjustment

45
- T885 Initial Tuning & Adjustment
  
  47
  - Channel Programming
    47
- Introduction
  
  47
- Test Equipment Required
  
  48
- Short Tuning Procedure
  
  49
  - Introduction
    49
  - Synthesiser Alignment
    49
  - Front End Alignment
    49
  - Mute Adjustment
    50
  - Noise Mute
    50
  - Carrier Level Mute
    50
  - Line Amplifier Output
    50
  - Ctcss
    51
  - Decoder Operation
    51
  - Opening Sinad
    51
  - High Pass Filter
    51
  - RSSI (if Used)
    52
- Audio Processor Links
  
  52
  - General
    52
  - Audio Processor Linking Details for CTCSS
    53
- Synthesiser Alignment
  
  54
- Alignment of Receiver Front End and if
  
  54
- Gating Delay
  
  55
- Carrier Level Mute
  
  56
- Noise Mute Adjustment
  
  56
- Rssi
  
  56
- Audio Processor
  
  57
  - Line Amplifier Output
    57
  - Monitor Amplifier Output (Speaker Output)
    57
- Ctcss
  
  57
  - Decoder Operation
    57
  - Opening Sinad
    57
  - High Pass Filter
    58
T881 General Information

81
- Introduction
  
  83
- Specifications
  
  84
  - Introduction
    84
  - General
    84
  - RF Section
    85
  - Audio Processor
    86
    
    Inputs
    86
    
    Modulation Characteristics
    87
    
    Ctcss
    87
  - Microcontroller
    87
  - Test Standards
    88
    
    DTI CEPT Recommendation T
    88
    
    Telecommunications Industry Association
    88
- Product Codes
  
  89
T881 Circuit Operation

91
- Introduction
  93
- Microcontroller
  94
- Synthesised Local Oscillator
  95
  - Two Point Modulation
    96
- Vco
  97
  - VCO Supply
    97
- Audio Processor
  98
  - General
    98
  - Audio Inputs
    98
  - Keying Inputs
    99
  - Compressor (Automatic Level Control (ALC))
    99
  - Outputs to Modulators
    99
- Power Supply & Regulator Circuits
  100
- Transmit Timers
  101
- Power Control Circuit & PA
  102
T881 Initial Tuning & Adjustment

103
- Introduction
  
  105
- Channel Programming
  
  105
- Test Equipment Required
  
  106
- Short Tuning Procedure
  
  107
  - Introduction
    107
  - Synthesiser Alignment
    107
  - Output Power Adjustment
    107
  - Two Point Modulation Adjustment
    108
  - CTCSS Encoder (if Used)
    109
  - FM Deviation (Limiter) Adjustment
    109
  - Line-In Level Adjustment
    109
- Audio Processor Links
  
  110
  - Link Details
    110
  - Typical Options
    110
- Synthesiser Alignment
  
  111
- PA Alignment
  
  112
- Thermal Shutdown
  
  112
- Audio Processor & CTCSS
  
  113
  - Two Point Modulation
    113
  - Modulator Adjustment
    113
  - CTCSS Encoder (if Used)
    114
  - Limiter Adjustment
    114
  - Line Level Without Compressor
    115
  - Compressor
    115
  - Compressor on Line Input Only
    115
  - Compressor on Microphone Input Only
    115
  - Compressor on both Line & Microphone Inputs
    116

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