Harris Gates Two 994 9203 002 Manuals

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Harris Gates Two 994 9203 002 Technical Manual

Harris Gates Two 994 9203 002 Technical Manual (110 pages)

Gates Series

Brand: Harris | Category: Transmitter | Size: 2 MB

Table of Contents

Table of Contents
10
Introduction
13
Introduction
17
- Three Phase Delta Distribution Transformers
  18
- Printed
  19
RF Output Connection
20
Airflow Sensor Status
21
Modulation Monitor Carrier Level
22
Application of Audio
23
- VSWR Detector
  26
- Introduction
  29
- PDM Amplifier
  30
High Voltage Supply Adjustment
32
IPA Tuning
33
- Overload Adjustment Procedures
  34
- Contactor Control
  35
- Power Output
  36
- VSWR Trips with High Levels of Modulation and High Power
  37
  - Improper Tuning and Loading
    37
  - Antenna
    37
  - Output Network
    37
Symptom: Remote Control Functions Do Not Work
37
- Possible Causes
  37
Troubleshooting am Noise
38
- 50/60 Hz
  38
- Audio Lines Are Normally Balanced
  38
- 60 Khz
  38
- RFI Noise on Audio
  38
  - Transmitter Overall
    39
Introduction
39
Personnel Protection
39
Principles of Operation
39
- FET'S in the GATES Series
  39
- PDM Theory in Brief
  39
- Polyphase Theory
  39
- Audio/Pdm Signal Flow
  39
- PDM Loop
  41
- RF Power Flow
  41
- Failsafe
  41
- AC Power Flow
  41
- High Voltage Power Supply
  41
  - Description
    41
  - Introduction
    41
  - Description
    44
  - Introduction
    44
    
    Parts List
    45
Introduction
45
- Section a
  63
- Oscillator (A16)
  63
Principles of Operation
63
Replacement/Alignment
63
Troubleshooting the RF Oscillator
63
- Symptom: no Output
  63
  - Open Fuse/Loss of +20V
    63
  - Rf Kill
    63
  - Q1,Q2,Cr1
    63
  - U1,Cr4
    63
    
    Section B
    67
    
    Ipa (A5)
    67
Handling Mosfet's
67
IPA Tuning and Testing
67
- Procedure
  67
  - IPA Tuning
    67
- Ohmmeter Testing the IPA
  67
Principles of Operation
67
- IPA Tuning Network
  67
Replacement/Alignment
67
Testing Mosfet's
68
- Section C
  71
- POWER AMPLIFIER A1 through A4
  71
PA Toroids
71
Principles of Operation
71
Replacing a PA Module
71
Troubleshooting the PA Boards
71
- Ohmmeter Testing
  71
Handling Mosfet's
72
RF Drive Phasing Measurement
72
- Section D
  77
- Output Network
  77
Scoping the RF Drive
72
Testing Mosfet's
72
- Replacing PA Transistors
  72
Adjustment Procedures
77
- Tuning and Loading Controls
  77
- Output Network Cold Tuning
  77
  - TEE Network - Load and Tune
    77
  - L2 Sliding Tap
    77
  - L1 Tap
    78
    
    Section E
    79
    
    Output Monitor (A18)
    79
Principles of Operation
77
Principles of Operation
79
Replacement/Alignment
79
Troubleshooting
79
- Symptom: Detector Null Reading Is High and Cannot be Adjusted to Zero
  79
  - Bad Load Impedance
    79
  - Sample Signal Missing
    79
    
    Section F
    83
    
    Pdm Generator (A15)
    83
Principles of Operation
83
Replacement/Alignment
83
Troubleshooting PDM Generator
83
- Symptom: no Pulses at J4, Causing Zero Power Out- Put from the Transmitter
  83
  - Power Setting
    83
  - Loss of Plus and Minus 15 Volts
    83
  - PDM Interrupt
    83
  - DC/Audio Failure
    83
- Symptom: Imbalance in Output Pulse Widths
  84
  - Audio Imbalance
    84
  - Triangle Wave Imbalance
    84
- Symptom: Only One Output High
  85
- Symptom: Two Outputs Are High
  85
- Symptom: All Four Outputs Are High
  85
  - Section G
    89
  - Pdm Amplifier/Pull-Up (A6-A9)
    89
Maintenance
89
- PDM Amplifiers
  89
- Gate Drive Checks
  89
- In-Circuit Ohmmetering the PDM Amp Module
  90
  - Checking Gate Drive
    92
Principles of Operation
89
- PDM Amplifier
  89
- PDM Pull-Up Board
  89
Handling Mosfet's
92
Testing Mosfet's
92
- Section H
  95
- PDM FILTER (A10 and A11)
  95
Principles of Operation
95
- Section J
  97
- Controller Board (A12)
  97
Principles of Operation
97
- Coarse Power Level Control
  97
- Contactor Control
  97
- Fine Power Control
  97
- Metering
  97
- Overload Circuitry
  97
- Other Fault Detection
  98
- Controller Supply Voltages
  98
Replacement/Alignment Procedures
98
Overload Adjustment Procedures
99
- Power Supply Current Overload
  99
- Underdrive Fault
  99
- VSWR Detector
  99
Troubleshooting the Controller
99
- Symptom: will Not Respond to an on Command
  99
  - Controller Supply Failure
    99
  - Failed Flip Flop Circuitry
    99
- Symptom: PDM Power Level Signal Cannot be con
  99
  - Section K
    103
  - Interface Board (A24)
    103
Principles of Operation
103
Replacement/Alignment
103
Troubleshooting
103
- Symptom: Green Power Level Status Led's Light on Controller, but the Contactors Do Not Energize
  103
  - Open Interlock
    103
  - 24 VAC Missing
    103
  - ON Command Missing
    103
  - Bad Triac or Optical Isolator
    103
    
    Appendix Ltest Equipment
    107
Introduction
107

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