Harris HTlFM - Page 10

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Table of Contents
SECTION I
Output Directional Coupler ...................... 4-1
DESCRIPTION
Controller .
.. ......... .. ...................... 4-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Power Supply ............................... 4-1
Equipment Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Operating Circuits ............................ 4-4
Physical Description .. ...... ....... .. ........... 1-1
Metering Circuits ... .. .............. .. ...... . 4-4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Overload and Alarm Circuits ................... 4-4
FM Exciter ................................. 1-1 Power Control Circuits ........................ 4-4
RF Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
User Interface RFI Filter and Transient Protection .. 4-6
Splitter (HT
lFM ONLY) . . . . . . . . . . . . . . . . . . . . . 1-1
AC Power Distribution ........................ 4-6
500 Watt Power Amplifier
..................... 1-1
250 Watt Power Amplifier . ... ....... .......... 1-1
Lowpass Filter . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . 1-1
Directional Coupler ........................... 1-1
Controller ................................... 1-1
Multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Controller Functions ................ .. ........ 1-3
Indicators
.. . ................... . . . ... ....... 1-3
Remote Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Remote Control Commands . . . . . . . . . . . . . . . . 1-4
Remote Control Metering Samples
.......... 1-4
Remote Status Indicators . . . . . . . . . . . . . . . . . . . 1-4
Equipment Characteristics . . . . . . . . . . . . . . . . . . . . . . . 1-4
SECTIONV
MAINTENANCE
Introduction
.................... . .......... .... 5-1
Purpose
.......................... . ... ........ 5-1
Station Records .
...... ..... . ................... 5-1
Transmitter Logbook
................... .... .. 5-1
Maintenance Logbook
....... ..... .. .......... 5-1
Safety Precautions
............................ 5-1
Preventive Maintenance
......................... 5-1
Filter Cleaning
......... ........ ..... .... .... 5-1
Blower Maintenance .......................... 5-1
Maintenance
Of Components ................... 5-1
Semiconductors
.......................... 5-1
SECTION
II
Capacitors .............................. 5-2
INSTALLATION
Fixed Resistors
.......................... 5-2
Introduction ................ . ............... . . . 2-1
Transformers
............................ 5-2
Unpacking .................................. 2-1
Meters
................................. 5-2
Retur::3 and Exchanges
... ................ .. . .. 2-1
Relays ................................. 5-2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Switches
.. . ...... ....................... 5-2
Cooling Air Requirements
.................. . .. 2-1
Corrective Maintenance .. ........ .. .......... .. . 5-2
Transmitter Placement
....................... . 2-1
Troubleshooting .... ... ............. ......... 5-2
Component Installation
......... ... ............ 2-1
Technical Assistance
.... ..... ....... ..... ...... 5-2
Reassembly Instructions
.... .... ..... .. .... 2-1
Alignment Procedures .......................... 5-2
Initial Checkout
.............................. 2-2
Voltmeter and Ammeter Calibration
............. 5-3
Connections to Remote Controls ................ 2-2
500 Watt PA Chassis, 250 Watt PA Chassis .
.. 5-3
External Fail-Safe Interlock Connections ......... 2-2
Voltmeter Calibration
.................. 5-3
BBS Connections ............................ 2-2 Ammeter Calibration ................... 5-3
SECTION III
OPERATION
Introduction
.... . .. ..... .............. ..... .... 3-1
Controls and Indicators .......................... 3-1
Preoperational Checks .......................... 3-6
Transmitter Turn
On and Checkout . ............... 3-6
Power Raise
& Lower ......................... 3-6
Transmitter Shutdown
........................... 3-6
PA Bypass Procedure
.. ............... . ......... 3-6
Single PA Bypass Procedure - (HT 1PM) ......... 3-6
PA Bypass Procedure - HT 500 and 250FM ..... 3-6
Overload Set Procedure ......................... 3-6
Controller Calibration Alarm and Fault Settings
.... 5-3
Manual Power Control Limit Setting ......... 5-3
Automatic Power Control (APC) Limit Setting 5-3
Forward Power Meter Calibration ........... 5-3
SWR Meter Calibration ..... .............. 5-3
SWR Foldback Trip Point Setting ........... 5-3
Reject Load - Balance Detector Fault Calibra-
tion
................................... 5-4
Setting Foldback Power Level .............. 5-4
Low Power Trip Set ...................... 5-4
Procedure for Removing an RF Power Transistor from
a PA Module
................................. 5-4
Procedure to Mount New Transistor to PA Module
... 5-4
SECTION IV
PRINCIPLES OF OPERATION
Introduction
... ..... .. ....................... .. 4-1
FM Exciter . ....... .. ......................... 4-1
500 Watt Power Amplifier (PA) .................. 4-1
SECTION VI
PARTS LIST
Introduction
... . .......................... ..... 6-1
Replaceable Parts Service ....................... 6-1
250 Watt Power Amplifier
(HT 250FM only) ....... 4-1 SECTION VII
Power Combiner (HT lFM ONLY) ................ 4-1 DIAGRAMS
Output Lowpass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
-1
iv
888-2312-002
WARNING: Disconnect primary
power prior to servicing.