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Manuals and User Guides for Tait T881. We have
1
Tait T881 manual available for free PDF download: Adjustment Manual
Tait T881 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
Additional Technical Information
7
Caution: CMOS Devices
7
Caution: Aerial Load
8
Caution: Beryllium Oxide & Power Transistors
8
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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