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RADIO
COMMUNICATIONS
IN THE DIGITAL AGE
VOLUME ONE :
HF TECHNOLOGY
First Printing, May 1996
Copyright © 1996
By Harris Corporation
All rights reserved
LIBRARY OF CONGRESS CATALOG CARD NUMBER: 96-94476
Harris Corporation, RF Communications Division
Radio Communications in the Digital Age
Volume One: HF Technology
Printed in USA
5/96 MG 25K
B1006
© Harris Corporation
All Harris RF Communications products and systems included herein
are trademarks of the Harris Corporation.
TABLE OF CONTENTS
INTRODUCTION
1
CHAPTER 2 THE IONOSPHERE AND
HF PROPAGATION
CHAPTER 3 ELEMENTS IN AN HF
RADIO SYSTEM
CHAPTER 4 NOISE AND
INTERFERENCE
17
CHAPTER 8 HF SYSTEMS AND
APPLICATIONS
67
CHAPTER 9 FUTURE DIRECTIONS
83
APPENDIX A STANDARDS
4
61
86
APPENDIX B GLOSSARY
CHAPTER 1 PRINCIPLES OF RADIO
COMMUNICATIONS
CHAPTER 7 SECURING
COMMUNICATIONS
88
28
42
FURTHER READING
101
CHAPTER 5 DATA COMMUNICATION
VIA HF RADIO
47
CHAPTER 6 ADAPTIVE RADIO
TECHNOLOGY
56
Note: Throughout this handbook, technical terms
and acronyms shown in italics are defined
in the Glossary, Appendix B.
INTRODUCTION
T
here was a time when radio communication was one of
a few methods for instant communication across distances.
We’ve all seen black-and-white wartime film clips of radio operators sending Morse code using bulky radio equipment. After
World War II, the communications industry turned its attention
to other technologies, leading to a period of slow growth in highfrequency (HF) radio communications during the 1960s and 1970s.
However, HF, also known as short wave, is now undergoing an
exciting revival propelled by an infusion of new technology.
Genesis
Modern radio technology had its birth with the publication
of James Clerk Maxwell’s Treatise on Electricity and Magnetism
in 1873, setting forth the basic theory of electromagnetic wave
propagation.
But the first radio waves were...