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Manuals
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Racal Instruments Manuals
Transceiver
TRA 7928
Technical manual
Racal Instruments TRA 7928 Technical Manual
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Contents
Table of Contents
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Table of Contents
First Aid in Case of Electric Shock
Product View
General Information
Specifications
Additional Items List
Installation
Location of Fuses
Simple End Fed Aerial Arrangement
Fixed Site Station
Power
Aerial
Earthing
Mobile Mounting Arrangement
Mobile Installation
Vehicle Mounting
Mobile Aerial Mounting
Marine Installation
Operation
Controls
Indicator Lamp
Press-To-Talk (PTT)
Principles of Operation
Reception (USB Operation)
Transmission (USB Operation)
AM Operation
Switchable Sideband
Emergency Calling
Supply Lines and Switching Circuits
Receive and Transmit 9V Lines/12V Line
Receive am Line
USB/LSB Operation
Oven Oscillator Unit
Channel Oscillator
Carrier Insertion Oscillator
Oven Control Circuit
Oven Oscillator Unit Type 3047
Exciter Receiver Board Type 3028
Filter Switch
IF Trap
First Mixer
Sideband Filter
IF Amplifiers
Second Mixer
Audio Pre-Amplifier
Agc
Exciter Circuit
AF Output Amplifier
AF Amplifier
Rceive and Transmit Supporting Circuitry
IF Strip
10Mhz Low Pass Filter
First Mixer Drive
Alternative Operating Modes
Second Mixer Drive
9V Regulator
AM Filter Switching
Switchable Sideband Operation
Limiting Amplifier
Secondary Detector
CI - Re-Insertion/Af Oscillator
Power Amplifier Type 3019
AC Signal Path
DC Bias
ALC Peak Output Detecting and Limiting
Average Output Detecting (am Operation)
Aerial Tuning Indicator
Two Tone Generator Board Type 4186
Aerial Tuning Unit Type 3032
Tuning Circuit
Reflectometer Type 4509
Recommended Test Equipment
Dismantling and Re-Assembly
Chassis Layout
Removal of Exciter/Receiver Board Type 3028
Removal of Power Amplifier 3019
Separation of Heat Sink and Board
Removal of Oven Oscillator Unit
Removal of Channel Oscillator Crystals
Removal of Carrier Insertion Oscillator Crystal
Removal of Two Tone Generator Board Type 4186
Removal of Aerial Tuning Unit
Removal of Items Mounted to Front Panel
Overall Transceiver TRA 7928 Checks
DC Supply Check
Location of Faulty Module
Receiver Functional, Transmitter Not
Tansceiver Non Functional on One Channel
Transceiver Non Functional on any Channel
Tests on Oven Oscillator Unit Type 3044
Input/Output DC Voltages
Oven Beating and Control
Tests on Oven Oscillator Unit Type 3047
Oven Heating and Control
Tests on Exciter/Receiver Board 3028
DC Check
AC Checks
Tests on Power Amplifier 3019
Tests on Power Amplifier Type 3019
Typical Voltages Measured with Respect to -Ve Rail
Typical Voltages Measured with Respect to +Ve Rail
Tests on Two Tone Generator Board Type 4186
Tests on Aerial Tuning Unit Type 3032
Reflectometer Board Typical Voltages
Alignment Procedures
Oven Oscillator Units
Oven Temperature Adjustments
Channel Oscillator Adjustment
Initial Transmitter Alignment
Sideband Filter Adjustment
AM Filter Alignment
Post Filter Alignment
Carrier Re-Insertion Alignment
Receiver Initial Settings
Receiver Not Fitted with am Facility
Receiver Fitted with am Facility
IF Rejection
Diagrams and Parts Lists
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