TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
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CONTENTS<br />
Part Title Page<br />
1 Key System, <strong>Circuit</strong> Description ......................................................... 4<br />
2 Selector Key, 4001-A ........................................................................... 17<br />
3 Selector, 4304-A and 4301-A ............................................................ 24<br />
4 Selector Test Set, 4001-B .................................................................. 35<br />
5 Dial System, <strong>Circuit</strong> Description ....................................................... 39<br />
6 Line Construction and Line Voltage Curves .................................. 50<br />
7 Line Test Set, LU.3101 ...................................................................... 53<br />
8 Relays, Adjustment of .......................................................................... 64<br />
9 Line Switch, 4120 Type ..................................................................... 73<br />
10 Line Switch, 4150 Type ..................................................................... 78<br />
11 Adjusting Tools..................................................................................... 84<br />
LIST OF ILLUSTRATIONS<br />
Figure Title Page<br />
1 General Schematic Key Sending System ............................ (facing) 8<br />
2 Selector <strong>Circuit</strong> operated through a No. 341-A or<br />
AAJ 4100-1 Transformer ............................................................... 12<br />
3 Selector <strong>Circuit</strong> operated through 2 Q.4104-1 or 2 No. 70A<br />
Repeating Coils in Series ................................................................ 12<br />
4 Branch Line operated through Repeating Coil .............................. 13<br />
5 Intermediate Telegraph Station . ..................................................... 13<br />
6 Selector Key Case (Capacity 40 Keys) ............................................ 17<br />
7 Selector Key, illustrating method of coding ................................... 18<br />
8 Selector Key, 4001-A ........................................................................... 21<br />
9 Selector 4304-A .................................................................................... 24<br />
10 Selector 4301-A exploded views........................................................ 32<br />
10a Selector 4304-A exploded views........................................................ 34<br />
11 Selector Test Set, 4001-B ................................................................... 35<br />
12 Selector Test Set, Schematic .............................................................. 37<br />
13 Dial System, Schematic .......................................................(facing) 84<br />
14 Line-Voltage Curves-direct signalling............................................... 51<br />
15 Line-Voltage Curves-signalling through one transformer ............ 52<br />
16 Line-Voltage Curves-signalling through two Repeating ....................<br />
Coils ......................................................................................................... 52<br />
17 The Line Test Set ................................................................................. 53<br />
18 Line Test Set-Battery Voltage Test, Schematic . ........................... 55<br />
19 Line Test Set, Resistance by Wheatstone Bridge Test, .....................<br />
Schematic................................................................................................ 56<br />
20 Line Test Set, Earth Fault by Murray Earth Test, Schematic .... 5 8<br />
21 Line Test Set, Resistance by Voltmeter Test, Schematic ............. 5 9<br />
22 Line Test Set, Volts, Resistance Curves .......................................... 60<br />
23 Line Test Set, Selector <strong>Circuit</strong> Impulse Ratio Test, Schematic.. 61<br />
24 Line Test Set, Reduced Voltage Test for 4301-A and 4304-A .........<br />
Selectors Schematic .............................................................................. 62<br />
25 Line Test Set, Telephone and Ringing <strong>Circuit</strong>, Schematic .......... 6 3<br />
26 The B.P.O. type Relay ........................................................................ 65<br />
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