Harris DX 25U Medium Wave Transmitter Manuals

Manuals and User Guides for Harris DX 25U Medium Wave Transmitter. We have 1 Harris DX 25U Medium Wave Transmitter manual available for free PDF download: Technical Manual

Harris DX 25U Technical Manual

Harris DX 25U Technical Manual (274 pages)

MEDIUM WAVE TRANSMITTER

Brand: Harris | Category: Transmitter | Size: 3 MB

Table of Contents

Table of Contents

3
Principles of Operation/Turn-On

7
- Section I
  
  11
  - Block Diagram
    11
  - Equipment Description
    11
  - Introduction
    11
    
    Scope and Purpose
    11
- Introduction/Specifications
  
  11
  - Specifications
    11
- Installation/Initial Turn on
  
  13
  - Delivery and Storage
    13
  - Introduction
    13
  - Returns and Exchanges
    13
  - Unpacking
    13
  - Factory Test Data
    14
  - Transmitter Placement
    14
    
    Cabinet Positioning
    14
    
    Removing the Combiner Crossover Bar
    14
    
    Cabinet Bolts
    15
    
    Cabinet Ground Strap
    15
    
    Cabinet Grounding Plate
    15
  - Air System and Cooling
    15
  - Electrical Installation
    15
    
    AC Power
    15
    
    Step Start Panel
    15
    
    Interconnection Wiring
    16
    
    Transformer Tap Settings
    16
  - Component Installation
    16
    
    PA Combiner Output Bar
    16
  - Transmitter Grounding
    16
  - Customer Interface Connections
    17
    
    Audio Input
    17
    
    External Interlock (Failsafe)
    18
    
    External RF Input
    18
    
    Frequency Monitor Connection
    18
    
    Modulation Monitor Connection
    18
  - RF Output Connection
    17
    
    Dummy Antenna Information
    17
  - Initial Turn on Procedure
    19
    
    Power Supply Test
    19
    
    Fan Rotation Check
    20
    
    PA Power Supply Check
    20
    
    Underdrive Overload Test
    20
    
    Driver Operation Check
    21
    
    Power Amplifier Stage Turn on Check
    21
    
    Raise/Lower Function Check
    21
    
    Setting Modulation Monitor Sample Levels
    22
    
    Audio Input Phasing Check (Optional)
    24
    
    Controller Battery Backup
    24
    
    Modulation Check
    24
    
    Setting Audio Input Level
    24
    
    Recording Normal Meter Readings
    25
  - Pre-Turn on Checks (Electrical)
    19
  - Pre-Turn on Checks (Mechanical)
    19
  - AM Stereo Installation and Tuning Hints
    25
    
    Bandpass Tuning 2C1
    25
    
    Interfacing for Stereo
    25
  - Remote Control Connections
    25
- WARNING: Disconnect Primary Power Prior to Servicing
  
  25
  - Analog Monitoring Outputs
    25
  - Control Inputs
    25
  - Status Monitoring Outputs
    25
  - Daily Preoperational Checkout
    29
  - Introduction
    29
  - Operating Procedures
    29
- Operators Guide
  
  29
  - Transmitter Turn-Off Procedure
    29
  - Transmitter Turn-On Procedure
    29
  - Transmitter Operations
    30
    
    Fault Conditions
    30
    
    Routine Meter Readings
    30
- Section IIIA
  
  33
- Controls and Indicators
  
  33
  - Block Diagram Description
    47
    
    Audio and Modulation Section
    47
    
    RF Section
    47
    
    Controller Section
    48
    
    Power Supplies
    48
  - Introduction
    47
- Overall System Theory
  
  47
  - Low Voltage Power Supply: Circuit Description
    48
    
    Power Distribution Board, A39
    50
  - PA Power Supply: Circuit Description
    50
    
    Interphase Transformer T3
    50
    
    PA Power Supply Transformer T1
    50
    
    PA Supply Discharge Circuit (Crowbar)
    50
    
    Power Supply Shorting Switches
    50
    
    Step Start Panel
    50
    
    VDC and +60 VDC Supplies
    50
    
    VDC Supply
    50
    
    A24 and A25 Fuse Board Sample Circuits
    51
    
    AC Power Protection Circuits
    51
    
    Fan Motor Fuses
    51
    
    Loss of Phase and "Brown-Out" Protection
    51
    
    Overvoltage and Undervoltage Protection
    51
    
    Secondary Winding Fuses
    51
    
    Supply Current Meter, M2
    51
    
    Supply Fuses
    51
  - Air System and Sensing Circuits
    51
    
    Air Flow and Temperature Sensing
    52
    
    Fans
    52
  - Interlocks
    52
    
    Door Interlock Circuit
    52
    
    External Interlock Circuit
    52
  - RF Circuits
    52
    
    RF Drive Cables
    52
    
    RF Drive Splitter, A15
    52
    
    Combiner Description
    53
    
    Power Amplifier Description
    53
    
    RF Samples from the Output Combiner
    54
  - Digital Modulation Principles
    54
    
    Digital Terms and Concepts
    54
    
    Analog to Digital Conversion
    55
    
    RF Amplifier Control
    55
    
    Amplitude Modulation in the DX-25U
    56
    
    Power Amplifier Stage
    56
    
    Summary: Digital Modulator
    56
    
    Maintenance/Alignments
    59
  - Output Network Description
    54
    
    Bandpass Filter
    54
    
    PI Matching Network
    54
    
    Spark Gap, E2
    54
  - Introduction
    59
  - Maintenance
    59
    
    Maintenance Logbook
    59
    
    Maintenance of Components
    59
    
    Preventive Maintenance
    59
  - Module Replacement/Alignment
    61
  - Modules Which Can be Replaced with no Adjust
    61
    
    Buffer Amplifier (A16)
    61
    
    PA Modules
    61
    
    Predriver
    61
    
    RF Drive Splitter Removal
    62
    
    RF Drive Splitter Replacement
    62
  - Boards Which Require Preset Switch Settings or Jumper Plug Positions
    62
    
    Modulation Encoder (A37)
    62
    
    Binary Combiner/Motherboard, Main Com
    63
    
    Biner/Motherboards (A5-A8)
    63
    
    Controller A38
    63
    
    Driver Combiner/Motherboard A14
    63
  - Printed Circuit Boards Which Require Adjustments
    63
    
    Analog Input Board (A35)
    64
    
    Analog to Digital Converter (A34)
    64
    
    Oscillator (A17)
    65
    
    DC Regulator (A30)
    66
    
    Driver Supply Regulator (A22)
    66
    
    Output Monitor (A27)
    67
    
    LED Board (A32)
    69
    
    Driver Encoder/Temp Sense Board (A19)
    71
    
    Switch Board/Meter Panel (A31)
    72
  - Frequency Change Procedure
    73
    
    Frequency Determined Components
    73
    
    Frequency Determined Jumpers and Switches
    73
    
    Output Network Dry Tune
    73
    
    Test Equipment Required for Frequency Change
    73
    
    RF Circuits Checkout
    74
    
    Initial Driver Tuning and Setup
    75
    
    Initial Tuning at Low Power
    76
    
    Completion of Basic Frequency Change of Transmit
    77
    
    Tuning at High Power
    77
    
    Other Adjustments
    78
Table 6-0. Troubleshooting the Transmitter

83

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