SIGNAL SUBCOURSE 321, AM RADIO TRANSMITTERS
INTRODUCTION
In the year 1896 the world unknowingly entered into a new era. In that year a
man named Guglielmo Marconi sent the first wireless message a distance of two miles
to a receiving device.
Five years later Marconi's equipment successfully sent a
signal across the Atlantic.
The era of fast communications had dawned.
Today
there is no spot on the globe that cannot be reached by radio. We even communicate
with our manned space capsules. The outgrowth of Marconi's first radio contact can
be seen everywhere you look today.
The military services, firemen, police
departments, transportation industries, such as airlines, railroads, taxi companies
and shipping lines, all use radio as their means of communication.
Along with
communication we have television, broadcast radio, stereo and hi-fi equipment,
navigational equipment, and detection devices such as radar and sonar. These are
all descendants of, or have evolved from, radio.
The use of RF waves has indeed
broadened since Marconi's first feeble attempt to use them to communicate.
However, none of these electronic miracles can do us any good unless we have
people trained to maintain and repair them. Every TV picture or radio message that
is sent must come from a transmitter.
This subcourse is designed to teach the principles of amplitude-modulated
transmitters and a systematic method of locating troubles in these transmitters.
This subcourse consists of four lessons and an examination, as follows:
Lesson 1.
CW Radio Transmitters
Lesson 2.
Lesson 3.
Transmitter Circuit Analysis
Lesson 4.
Troubleshooting Procedures
Examination
Credit Hours: 9
You are urged to finish this subcourse without delay; however, there is no
specific limitation on the time you may spend on any lesson or the examination.
Texts and materials furnished: Subcourse booklet with lesson exercises, lesson
solutions and Examination.
Two Porta Punch Examination Answer Cards.
Return self addressed envelope
TM 11-665, C-W and A-M Radio Transmitters and Receivers, September 1952.
(EXTRACTED)
Reviewed and reprinted with minor revisions February 1979.
321
1
Previous Page
