Radio Wave Propagation and Antennas
Introduction - is114370008
Lesson 1. Identify Characteristics of Wave Propagation
Figure 1. Simple radio communication system.
Figure 2. Layers of the earth's atmosphere.
Table 1. Frequency band coverage. - is114370012
Table 2. Frequency band characteristics. - is114370013
Figure 3. Principal paths of radio waves.
Figure 4. Mirror Reflection. - is114370015
Figure 5. Bending of light by refraction.
Figure 6. Diffraction of wave around solid object.
Surface Wave Component.
Frequency Characteristics of Ground Waves.
Frequency bands use certain components of the ground wave:
Lesson 1/Learning Event 1 - Practice Exercise
Lesson 1/Learning Event 1 - Practice Exercise - Continued
Learning Event 2: Skywaves - is114370023
Ionosphere Storms
Figure 10. Solar eruption. - is114370025
Figure 11. Sunspots.
Figure 12. Layers of the ionosphere.
Figure 13. Effect of frequency on the critical angle.
Characteristics of the Ionosphere.
Regular Variations of Ionosphere.
Figure 16.
Table 4. Regular Variations of Ionosphere. - is114370032
Table 4. Regular Variations of Ionosphere. - Continued
Figure 17. Daily and seasonal variations in ion density.
Single Hop Transmission
Multiple Hop Transmission
Figure 19.
Irregular Variation of Ionosphere.
Table 5. Irregular Variations of Ionosphere.
Ionospheric Predictions - is114370040
Figure 21. Bright solar eruption.
Sky Wave Transmission Path.
Figure 23.
Figure 24. Average layer distribution of the ionosphere. - is114370044
Figure 25. Skip zone. - is114370045
Figure 26.
Figure 28. Frequency versus distance for returned waves. - is114370047
Signal Strength.
Lesson 1/Learning Event 2 Practice Exercise
Lesson 1/Learning Event 2 Practice Exercise - Continued
Lesson 1. Comprehensive Practice Exercise
Lesson 1. Comprehensive Practice Exercise - Continued
Lesson 1. Identify Chracteristics of Wave Propagation
Half-Wave and Quarter-Wave Antennas
Figure 29. Effect of antenna circumference on wave velocity
Figure 30. Impedance along half-wave antenna. - is114370056
Transmission Lines
Basic Feeder Systems - is114370058
Figure 31. Single-wire and twisted-pair feed systems.
Basic Radiation Patterns
Figure 33. Flashlight as anistropic source of radiation.
Figure 34. Development of vertical and horizontal plane
Figure 35. Radiation pattern of dipole (half-wave) antenna.
Practical Half-Wave Antennas
Ground-Affected Radiation Patterns.
Figure 38.
Figure 39. Solid pattern produced by horizontal half-wave
Changes in Radiation Resistance.
Figure 40. Vertical-plane radiation patterns produced by vertical half-wave antennas.
Figure 41. Solid patterns produced by vertical half-wave
Table 6. Ground Material Conductivity. - is114370071
Polarization.
Lesson 2/Learning Event 1 Practice Exercise - is114370073
Lesson Event 2: Common Antennas
Figure 43. A Typical Doublet.
Figure 45. Fourteen percent off-center fed antenna.
Figure 46. Inverted "L" antenna.
The slant-wire antenna - is114370078
Antenna has to be a quarter-wave in length.
Figure 50.
Quarter-Wave Antennas.
Figure 53. Quarter-wave antenna connected to ground.
Figure 55. Distribution of voltage and current
Radiation Characteristics.
Figure 57. Radiation pattern produced by a grounded
Types of Grounds.
Figure 59. Ground system for vertical antennas.
Figure 60. Wire counterpoises.
Figure 61. Vertical quarter-wave antenna.
Figure 62. Vertical doublet.
Bent Antennas.
Figure 64. Typical ground-plane antenna.
Figure 65. Jungle antenna (elevated ground-plane).
Figure 66. Vertical ground-plane antenna.
Figure 67. Typical whip antennas.
Figure 68. Best directivity of whip antenna mounted
Figure 69. 0-200 mile net.
Figure 70. Tying the whip antenna down.
Harmonically Operated Antennas in Free Space.
Half-Rombic Antenna.
Figure 72. Development of radiation pattern
Figure 73. Typical military half-rombic antenna.
Electromagnetic Pulse.
FM Squelch Capture Effect.
FM Squelch Capture Effect. - Continued
Lesson 2 / Learning Event 2 Practice Exercise
Lesson 2 / Learning Event 2 Practice Exercise - Continued
Learning Event 3: Siting - is114370108
Ground Conductivity For Various Terrain - is114370109
Single-hop Skip Distances at Various Vertical Take-off Angles - is114370110
Frequency Planning Guide - is114370111
Figure 74. Vehicle chassis counterpoise.
Figure 75. Use of the counterpoise with a vehicle.
Figure 76. L antenna.
Figure 77. Sloping wire antenna.
The Short Path Sky Wave.
Figure 79. A λ/2 dipole in free space.
Figure 81. Doublet antenna sag.
Figure 83. A typical doublet.
Figure 85. Multifrequency doublet.
Figure 87. The multiple doublet antenna.
Communication between 250 to 800 miles.
Tactical Radio System Analysis
Lesson 2 / Learning Event 3 Practice Exercise
Lesson 2 / Learning Event 3 Practice Exercise - Continued
Frequency Selection
Frequency Selection - Continued
Frequency Selection - Continued - is114370128
Frequency Selection - Continued - is114370129
Let's do a couple of sky-wave frequency selection problems.
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370131
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370132
Volume 8. Central Europe
The Intermediate and Short Distance (ISD) and Air/Ground (A/G)
Map of Areas - is114370135
Index to Lowesr Useful High Frequency (LUF)
Maximum Usable Frequencies
Lowest Useful High Frequencies
Lowest Useful High Frequencies - Continued - is114370139
Lowest Useful High Frequencies - Continued - is114370140
Lowest Useful High Frequencies - Continued - is114370141
Lowest Useful High Frequencies - Continued - is114370142
Lowest Useful High Frequencies - Continued - is114370143
Lowest Useful High Frequencies - Continued - is114370144
Lowest Useful High Frequencies - Continued - is114370147
Lowest Useful High Frequencies - Continued - is114370148
Lowest Useful High Frequencies - Continued - is114370149
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370150
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370151
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370152
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370153
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370154
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370155
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370156
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370157
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370158
Take-Off Angle Vs Distance - is114370159
Half-Wave Doublet Antenna Vertical Pattern, Height 25 Feet - is114370160
Half-Wave Doublet Antenna Vertical Pattern, Height 40 Feet - is114370161
Half-Wave Doublet Radiation Pattern, Quater Wave High
Conclusion
Ground-Wave Propagation Charts (GW Book) Volume 2 Central Europe - is114370164
Map of Areas
Index to Ground Wave Ranges
Ground Wave Ranges in Statute Miles
Ground Wave Ranges in Statute Miles - Continued - is114370168
Ground Wave Ranges in Statute Miles - Continued - is114370169
Ground-Wave Propagation Charts (GW Book) Volume 2 Central Europe - Continued
Lesson 2 / Learning Event 4 Practice Exercise
Lesson 2 / Learning Event 4 Practice Exercise - Continued
Lesson2 Comprehensive Practice Exercise
Lesson2 Comprehensive Practice Exercise - Continued
Lesson 2. Calculate Antenna Length
Answer to Practical Exercises
Answer to Practical Exercises - Continued - is114370177
Answer to Practical Exercises - Continued - is114370178
Introduction - is114370008
Lesson 1. Identify Characteristics of Wave Propagation
Figure 1. Simple radio communication system.
Figure 2. Layers of the earth's atmosphere.
Table 1. Frequency band coverage. - is114370012
Table 2. Frequency band characteristics. - is114370013
Figure 3. Principal paths of radio waves.
Figure 4. Mirror Reflection. - is114370015
Figure 5. Bending of light by refraction.
Figure 6. Diffraction of wave around solid object.
Surface Wave Component.
Frequency Characteristics of Ground Waves.
Frequency bands use certain components of the ground wave:
Lesson 1/Learning Event 1 - Practice Exercise
Lesson 1/Learning Event 1 - Practice Exercise - Continued
Learning Event 2: Skywaves - is114370023
Ionosphere Storms
Figure 10. Solar eruption. - is114370025
Figure 11. Sunspots.
Figure 12. Layers of the ionosphere.
Figure 13. Effect of frequency on the critical angle.
Characteristics of the Ionosphere.
Regular Variations of Ionosphere.
Figure 16.
Table 4. Regular Variations of Ionosphere. - is114370032
Table 4. Regular Variations of Ionosphere. - Continued
Figure 17. Daily and seasonal variations in ion density.
Single Hop Transmission
Multiple Hop Transmission
Figure 19.
Irregular Variation of Ionosphere.
Table 5. Irregular Variations of Ionosphere.
Ionospheric Predictions - is114370040
Figure 21. Bright solar eruption.
Sky Wave Transmission Path.
Figure 23.
Figure 24. Average layer distribution of the ionosphere. - is114370044
Figure 25. Skip zone. - is114370045
Figure 26.
Figure 28. Frequency versus distance for returned waves. - is114370047
Signal Strength.
Lesson 1/Learning Event 2 Practice Exercise
Lesson 1/Learning Event 2 Practice Exercise - Continued
Lesson 1. Comprehensive Practice Exercise
Lesson 1. Comprehensive Practice Exercise - Continued
Lesson 1. Identify Chracteristics of Wave Propagation
Half-Wave and Quarter-Wave Antennas
Figure 29. Effect of antenna circumference on wave velocity
Figure 30. Impedance along half-wave antenna. - is114370056
Transmission Lines
Basic Feeder Systems - is114370058
Figure 31. Single-wire and twisted-pair feed systems.
Basic Radiation Patterns
Figure 33. Flashlight as anistropic source of radiation.
Figure 34. Development of vertical and horizontal plane
Figure 35. Radiation pattern of dipole (half-wave) antenna.
Practical Half-Wave Antennas
Ground-Affected Radiation Patterns.
Figure 38.
Figure 39. Solid pattern produced by horizontal half-wave
Changes in Radiation Resistance.
Figure 40. Vertical-plane radiation patterns produced by vertical half-wave antennas.
Figure 41. Solid patterns produced by vertical half-wave
Table 6. Ground Material Conductivity. - is114370071
Polarization.
Lesson 2/Learning Event 1 Practice Exercise - is114370073
Lesson Event 2: Common Antennas
Figure 43. A Typical Doublet.
Figure 45. Fourteen percent off-center fed antenna.
Figure 46. Inverted "L" antenna.
The slant-wire antenna - is114370078
Antenna has to be a quarter-wave in length.
Figure 50.
Quarter-Wave Antennas.
Figure 53. Quarter-wave antenna connected to ground.
Figure 55. Distribution of voltage and current
Radiation Characteristics.
Figure 57. Radiation pattern produced by a grounded
Types of Grounds.
Figure 59. Ground system for vertical antennas.
Figure 60. Wire counterpoises.
Figure 61. Vertical quarter-wave antenna.
Figure 62. Vertical doublet.
Bent Antennas.
Figure 64. Typical ground-plane antenna.
Figure 65. Jungle antenna (elevated ground-plane).
Figure 66. Vertical ground-plane antenna.
Figure 67. Typical whip antennas.
Figure 68. Best directivity of whip antenna mounted
Figure 69. 0-200 mile net.
Figure 70. Tying the whip antenna down.
Harmonically Operated Antennas in Free Space.
Half-Rombic Antenna.
Figure 72. Development of radiation pattern
Figure 73. Typical military half-rombic antenna.
Electromagnetic Pulse.
FM Squelch Capture Effect.
FM Squelch Capture Effect. - Continued
Lesson 2 / Learning Event 2 Practice Exercise
Lesson 2 / Learning Event 2 Practice Exercise - Continued
Learning Event 3: Siting - is114370108
Ground Conductivity For Various Terrain - is114370109
Single-hop Skip Distances at Various Vertical Take-off Angles - is114370110
Frequency Planning Guide - is114370111
Figure 74. Vehicle chassis counterpoise.
Figure 75. Use of the counterpoise with a vehicle.
Figure 76. L antenna.
Figure 77. Sloping wire antenna.
The Short Path Sky Wave.
Figure 79. A λ/2 dipole in free space.
Figure 81. Doublet antenna sag.
Figure 83. A typical doublet.
Figure 85. Multifrequency doublet.
Figure 87. The multiple doublet antenna.
Communication between 250 to 800 miles.
Tactical Radio System Analysis
Lesson 2 / Learning Event 3 Practice Exercise
Lesson 2 / Learning Event 3 Practice Exercise - Continued
Frequency Selection
Frequency Selection - Continued
Frequency Selection - Continued - is114370128
Frequency Selection - Continued - is114370129
Let's do a couple of sky-wave frequency selection problems.
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370131
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370132
Volume 8. Central Europe
The Intermediate and Short Distance (ISD) and Air/Ground (A/G)
Map of Areas - is114370135
Index to Lowesr Useful High Frequency (LUF)
Maximum Usable Frequencies
Lowest Useful High Frequencies
Lowest Useful High Frequencies - Continued - is114370139
Lowest Useful High Frequencies - Continued - is114370140
Lowest Useful High Frequencies - Continued - is114370141
Lowest Useful High Frequencies - Continued - is114370142
Lowest Useful High Frequencies - Continued - is114370143
Lowest Useful High Frequencies - Continued - is114370144
Lowest Useful High Frequencies - Continued - is114370147
Lowest Useful High Frequencies - Continued - is114370148
Lowest Useful High Frequencies - Continued - is114370149
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370150
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370151
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370152
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370153
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370154
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370155
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370156
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370157
Let's do a couple of sky-wave frequency selection problems. - Continued - is114370158
Take-Off Angle Vs Distance - is114370159
Half-Wave Doublet Antenna Vertical Pattern, Height 25 Feet - is114370160
Half-Wave Doublet Antenna Vertical Pattern, Height 40 Feet - is114370161
Half-Wave Doublet Radiation Pattern, Quater Wave High
Conclusion
Ground-Wave Propagation Charts (GW Book) Volume 2 Central Europe - is114370164
Map of Areas
Index to Ground Wave Ranges
Ground Wave Ranges in Statute Miles
Ground Wave Ranges in Statute Miles - Continued - is114370168
Ground Wave Ranges in Statute Miles - Continued - is114370169
Ground-Wave Propagation Charts (GW Book) Volume 2 Central Europe - Continued
Lesson 2 / Learning Event 4 Practice Exercise
Lesson 2 / Learning Event 4 Practice Exercise - Continued
Lesson2 Comprehensive Practice Exercise
Lesson2 Comprehensive Practice Exercise - Continued
Lesson 2. Calculate Antenna Length
Answer to Practical Exercises
Answer to Practical Exercises - Continued - is114370177
Answer to Practical Exercises - Continued - is114370178
