Table Of Contents - Hitachi ATT-20 Installation, Operation, Troubleshooting

1. GENERAL INFORMATION ............................................................................................................... 1-1
1.1. Introduction ............................................................................................................................... 1-1
1.2. Physical Description ................................................................................................................. 1-1
1.3. Specifications ............................................................................................................................ 1-1
1.3.1. Power Requirements .................................................................................................... 1-1
1.3.2. Transceiver Characteristics .......................................................................................... 1-2
1.3.3. Receiver Characteristics ............................................................................................... 1-2
1.3.4. Miscellaneous ............................................................................................................... 1-3
2. APPLICATION, INSTALLATION, AND ADJUSTMENTS ................................................................ 2-1
2.1. General ..................................................................................................................................... 2-1
2.2. Shunt Mode Track Circuit Application ...................................................................................... 2-1
2.3. Series Mode Track Circuit Application ...................................................................................... 2-2
2.4. Terminal Connections ............................................................................................................... 2-3
2.5. Mounting Requirements ............................................................................................................ 2-3
2.6. General Considerations ............................................................................................................ 2-3
2.7. Shunt Mode Operation .............................................................................................................. 2-4
2.7.1. Shunt Mode Installation ................................................................................................ 2-4
2.7.2. Shunt Mode Adjustment ............................................................................................... 2-5
2.8. Series Mode Operation ............................................................................................................. 2-5
2.8.1. Series Mode Installation ............................................................................................... 2-6
2.8.2. Series Mode Adjustment without Cable Compensating PCB ....................................... 2-6
2.8.3. Series Mode Adjustment with Cable Compensating PCB ............................................ 2-7
2.9. Lightning Protection .................................................................................................................. 2-7
3. FUNCTIONAL DESCRIPTION .......................................................................................................... 3-1
3.1. General ..................................................................................................................................... 3-1
3.2. Shunt Mode Track Circuit ......................................................................................................... 3-1
3.3. Series Mode Track Circuit ........................................................................................................ 3-1
3.4. Detailed Circuit Description ...................................................................................................... 3-1
3.4.1. Transmitter .................................................................................................................... 3-1
3.4.2. Receiver ........................................................................................................................ 3-2
4. FIELD MAINTENANCE ..................................................................................................................... 4-1
4.1. General ..................................................................................................................................... 4-1
4.2. Test Equipment ......................................................................................................................... 4-1
4.3. General Checks ........................................................................................................................ 4-1
4.4. Shunt Mode Checks ................................................................................................................. 4-1
4.5. Series Mode Checks ................................................................................................................. 4-3
5. SHOP MAINTENANCE ..................................................................................................................... 5-1
6. PARTS LISTS .................................................................................................................................... 6-1
6.1. ATT-20 Audio Track Receiver Kits ........................................................................................... 6-1
Copyright 2019

Table of Contents

SM 6299 Rev. 3, March 2019
ATT-20 Audio Track Transceiver
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