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Gates Five 994 9204 002
Harris Gates Five 994 9204 002 User Manual
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GATES
ONE
-
994
9202
0
02
GATES
TWO
-
9
94
9203
002
GATES
FIVE
(1-PHASE)
-
994
9204
002
GATES
FIVE
(3-PHASE)
-
994
9205
002
T.M.
No.
888-2314-001
Printed:
1990
©
Copyri
ght
1990,
1991,
1992,
1994,
1995,
1996,
1998,
1999,
2000,
200
1,
2002
Rev.
AF:
06-21-02
Harris
Corporation
All
r
ights
r
eserved
TECHNICAL
MANUAL
GATES
S
eries™
AM
TRANSMITTERS
2
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
Remote/Local Switch
37
Remote Control Improperly Wired
37
Remote Control Unit Not Functioning
37
Ribbon Connectors Loose
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
PA Voltage Electrical Zero
98
PA Volt Meter Calibration
98
Power Supply Current Calibration
98
Power Output Calibration
99
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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Harris Gates Five 994 9204 002 Specifications
General
Brand
Harris
Model
Gates Five 994 9204 002
Category
Transmitter
Language
English
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