Racal Instruments TRA 7928 Manuals

Manuals and User Guides for Racal Instruments TRA 7928. We have 1 Racal Instruments TRA 7928 manual available for free PDF download: Technical Manual

Racal Instruments TRA 7928 Technical Manual (141 pages)

Brand: Racal Instruments | Category: Transceiver | Size: 4.51 MB

First Aid in Case of Electric Shock
2
Product View
9
General Information
11
Specifications
12
Additional Items List
14
Installation
15
Location of Fuses
15
Simple End Fed Aerial Arrangement
16
Fixed Site Station
17
Power
17
Aerial
17
Earthing
17
Mobile Mounting Arrangement
18
Mobile Installation
19
Vehicle Mounting
19
Mobile Aerial Mounting
20
Marine Installation
22
Operation
25
Controls
25
Indicator Lamp
26
Press-To-Talk (PTT)
26
Principles of Operation
31
Reception (USB Operation)
31
Transmission (USB Operation)
32
AM Operation
33
Switchable Sideband
33
Emergency Calling
33
Supply Lines and Switching Circuits
35
Receive and Transmit 9V Lines/12V Line
35
Receive am Line
35
USB/LSB Operation
35
Oven Oscillator Unit
39
Channel Oscillator
39
Carrier Insertion Oscillator
39
Oven Control Circuit
40
Oven Oscillator Unit Type 3047
43
Exciter Receiver Board Type 3028
45
Filter Switch
47
IF Trap
47
First Mixer
47
Sideband Filter
47
IF Amplifiers
48
Second Mixer
48
Audio Pre-Amplifier
48
Agc
48
Exciter Circuit
49
AF Output Amplifier
49
AF Amplifier
49
Rceive and Transmit Supporting Circuitry
50
IF Strip
50
10Mhz Low Pass Filter
50
First Mixer Drive
50
Alternative Operating Modes
51
Second Mixer Drive
51
9V Regulator
51
AM Filter Switching
51
Switchable Sideband Operation
52
Limiting Amplifier
52
Secondary Detector
52
CI - Re-Insertion/Af Oscillator
52
Power Amplifier Type 3019
53
AC Signal Path
55
DC Bias
55
ALC Peak Output Detecting and Limiting
56
Average Output Detecting (am Operation)
56
Aerial Tuning Indicator
56
Two Tone Generator Board Type 4186
57
Aerial Tuning Unit Type 3032
59
Tuning Circuit
59
Reflectometer Type 4509
59
Recommended Test Equipment
61
Dismantling and Re-Assembly
63
Chassis Layout
64
Removal of Exciter/Receiver Board Type 3028
65
Removal of Power Amplifier 3019
65
Separation of Heat Sink and Board
66
Removal of Oven Oscillator Unit
67
Removal of Channel Oscillator Crystals
67
Removal of Carrier Insertion Oscillator Crystal
67
Removal of Two Tone Generator Board Type 4186
68
Removal of Aerial Tuning Unit
68
Removal of Items Mounted to Front Panel
68
Overall Transceiver TRA 7928 Checks
69
DC Supply Check
71
Location of Faulty Module
72
Receiver Functional, Transmitter Not
73
Tansceiver Non Functional on One Channel
73
Transceiver Non Functional on any Channel
74
Tests on Oven Oscillator Unit Type 3044
75
Input/Output DC Voltages
77
Oven Beating and Control
77
Tests on Oven Oscillator Unit Type 3047
79
Oven Heating and Control
81
Tests on Exciter/Receiver Board 3028
85
DC Check
85
AC Checks
86
Tests on Power Amplifier 3019
89
Tests on Power Amplifier Type 3019
91
Typical Voltages Measured with Respect to -Ve Rail
93
Typical Voltages Measured with Respect to +Ve Rail
94
Tests on Two Tone Generator Board Type 4186
95
Tests on Aerial Tuning Unit Type 3032
97
Reflectometer Board Typical Voltages
97
Alignment Procedures
99
Oven Oscillator Units
101
Oven Temperature Adjustments
101
Channel Oscillator Adjustment
102
Initial Transmitter Alignment
103
Sideband Filter Adjustment
103
AM Filter Alignment
104
Post Filter Alignment
104
Carrier Re-Insertion Alignment
104
Receiver Initial Settings
105
Receiver Not Fitted with am Facility
105
Receiver Fitted with am Facility
105
IF Rejection
105
Diagrams and Parts Lists
109

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