(Ebook - English) Us Army - Electronics Course Ss 0330 - Introduction To Telephone And Telegraph Transmission.pdf

(4385 KB) Pobierz
SUBCOURSE
SS0330
EDITION
9
INTRODUCTION TO TELEPHONE
AND TELEGRAPH TRANSMISSION
SIGNAL SUBCOURSE 330
INTRODUCTION TO TELEPHONE AND TELEGRAPH TRANSMISSION
INTRODUCTION
On May 24, 1844, Samuel Morse sent his first message from Washington, D.C. to Baltimore, Md. He used a
series of electrical pulses over a wire line to operate a magnet. The magnet produced clicks and recorded a code of dots
and dashes on a moving paper tape. This code represented letters of the alphabet and was translated into words.
In 1876 Alexander Graham Bell devised and patented the first capable telephone system. Until the invention of
the telephone, the distance over which the human voice could be used for communication was limited by the lung power
of the speaker and by the ear sensitivity of the listener.
The use of the telephone and the teletypewriter in military communications systems has provided one of the
most reliable means of sending messages quickly and accurately. The communications specialist must therefore have a
working itinerary with each of the various types of equipment.
In this subcourse you will learn the principles of sound as well as the theory operation of telephone and
teletypewriter systems.
STUDENT ACTIONS
Specific performances and lesson objectives are listed at the beginning of each lesson. Here is a brief summary
of these objectives.
1.
To enable you to understand what sound waves are, what makes up a telephone and what is represented by
electronic symbols on schematics and other diagrams. You will also learn how a telephone is constructed and what
makes it operate.
2.
To teach you the operational characteristics of a local-battery telephone system and a common battery telephone
system.
1
3.
To enable you to understand the construction principles and types of circuits used with various transmission lines.
To teach you the types of telephone operation, power gain and/or loss, simplex and phantom circuits, thus providing you
a better understanding of the world of telephone communications.
4.
To enable you to understand operation of teletype circuits, teletype operation, the Baudot code and identify terms
and symbols peculiar to teletype operations.
* * * IMPORTANT NOTICE * * *
THE PASSING SCORE FOR ALL ACCP MATERIAL IS NOW 70%.
PLEASE DISREGARD ALL REFERENCES TO THE 75% REQUIREMENT.
2
SUBCOURSE SS0330 ............................................................................Introduction to Telephone and
Telegraph Transmission
CONTENTS
Lesson 1
Sound and Telephony
PAGE
4
CREDIT HOURS
2
Chapter 1 Sound and Telephony
Chapter 2 Transmitter and
Receivers
Lesson 2
Telephone Systems
58
2
Chapter 3 Introduction to
Telephone Sys
Chapter 4 Local Battery
Telephony
Chapter 5 Common Battery
Telephony
Lesson 3
Wire Transmission Principles
113
1
Chapter 6 Transmission Lines
Chapter 7 Special Circuits
Lesson 4
Fundamentals of Teletypewriter
163
2
Chapter 9 Introduction to
Teletypewriter
Communications
Chapter 10 Teletypewriter Circuits
Lesson Exercise Solutions
192
3
LESSON 1
SOUND AND TELEPHONY
OBJECTIVE:
Action:
You will describe the characteristic of sound waves, identify electronic symbols on a
telephone system schematic diagram, analyze the construction of a telephone transmitter
and receiver.
You will be provided the lesson material and a lesson exercise sheet.
You must respond correctly to at least 17 of the 20 questions in the lesson exercise.
2
Read inclosed text
Pencil or pen
None
Conditions:
Standard:
CREDIT HOURS:
TEXT ASSIGNMENT:
MATERIALS REQUIRED:
SUGGESTIONS:
4

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin