Propagation

• Fluctuations of the received signal are called FADING
• Can be attributed to a variety of reasons
• Signals arriving at the receiver by more than one path (multipath – due to ionospheric variations) can either reinforce or cancel one another
• Polarisation of the radio wave may be changed by propagation conditions resulting in an apparent reduction of strength
• At vhf and uhf fading may be attributed to varying atmospheric conditions, temperature, humidity, etc.

Course Guide Topics

1. Electric Field
2. Magnetic Field
3. Electromagnetic Field
4. Propagation Velocity
5. Signal Attenuation
6. Atmospheric Layers
7. Ionospheric Layers
8. Ionosphere – diagram
9. Layer Properties
10. Ground and Sky Waves
11. Skip Distance
12. MUF
13. LUF
14. Critical Frequency
15. Fading
16. Sunspots & Flares
17. Troposphere
18. VHF/UHF Propagation
19. Line of Sight Propagation
20. Diffraction