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ANSWERS TO QUESTIONS Q1. THROUGH Q13 - 14189_141
MEDIUM FREQUENCY AND BELOW

Neets Module 17-Radio-Frequency Communications Principles
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5-1 CHAPTER 5 INTRODUCTION TO MISCELLANEOUS COMMUNICATIONS SYSTEMS AND EQUIPMENT LEARNING OBJECTIVES Upon completion of this chapter you will be able to: 1.    Describe the basic operation of communications systems that operate at medium frequencies and below. 2.    Describe the basic microwave line-of-sight communications system. 3.    Describe the basic tropospheric scatter communications system. 4.    Describe the objective/purpose of the naval tactical data system (NTDS). 5.    Describe the naval tactical data system (NTDS) data transmission subsystems in terms of links. 6.    Explain the various applications of portable communications equipment. 7.    Define the term laser. 8.    Describe the basic theory of operation of lasers 9.    Describe the possible applications of lasers in communications. INTRODUCTION In the previous four chapters we've looked at communications equipment and systems that were used in several frequency ranges. Some have had many applications. In this chapter you will look at systems used in some portions of the rf spectrum that have not been covered in detail. We will also discuss the naval tactical data system (NTDS), which operates in the high-frequency and ultrahigh-frequency regions. Various portable communications equipments used in the military and an introduction to the laser and its uses in communications are included. Some of the applications presented are fairly new to the military community. SYSTEMS As discussed in chapter 1, the frequency range from elf to shf is from below 300 hertz up to 30 gigahertz. The first area we will cover is the lower frequency bands (medium frequency [mf] and below). You will then get a look at the microwave region and the high-frequency and ultrahigh-frequency range as it pertains to the naval tactical data system (NTDS).






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