Chapter 5:
Waves, Wavelength, Frequency, and Bands
Objectives:
This lesson introduces the students to:
- the terms frequency, wavelength, and band.
- simple calculations involving the relationship between wavelength
and frequency
- the bands that make up the radio portion of the electromagnetic
spectrum.
Apparatus:
- Oscilloscope, if available
Handouts:
Lesson Plan:
Students can do a large part of this chapter on their own. However
there are few concepts for you to stress.
- Go over the homework from Chapter 4.
- Use the oscilloscope to illustrate the terms Amplitude, Frequency,
and Wavelength. Emphasize the inverse relationship between frequency and
wavelength.
- Have the class do Chapter 5 quiz questions 8, 9, and 10 in
class.
- Touch on the relationship between frequency and wavelength for
electromagnetic waves and the short version.
- Emphasize the conversion of kHz to MHz, MHz to kHz.
- The section on bands the students can do on their own. Tell them
that some of this will come back to haunt them when they do the section
of Regulations.
- Using slide 3, discuss what modes and equipment would be typically
used on each of these bands. Reinforce the relationship between the
frequency of the band and the propagation characteristics. (HF, VHF,
etc)
Homework
- Read Chapter 5.
- Do the Chapter 5 Quiz. If you elect to do this chapter over two
classes then you will have to break this quiz up into two
parts.
- Skim Chapter 6.
Chapter 5 Quiz:
Printable copy of the Review
Quiz
Answers to Chapter 5 Quiz
1 |
C |
4 |
A |
7 |
C |
10 |
A |
* |
* |
2 |
C |
5 |
A |
8 |
B |
11 |
D |
* |
* |
3 |
D |
6 |
D |
9 |
C |
* |
* |
* |
* |
Overhead Slide Versions of the Diagrams
- Slide
1
5.1 Waves - Crest, Trough and Amplitude
5.2 Waves - 1
Complete Cycle
5.4 Wavelength
- Slide
2 (Relationship between Time and Frequency)
5.3 One
Cycle and 7 Cycles per Second
5.5 Cycles of Long and Short Wavelength
- Slide
3
5.6 Spectrum Allocation, HF bands
5.7 Spectrum Allocation,
VHF Bands