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There are several theories as to why this occurs, suffice to say that is a very useful phenomenon since it increases the surface range of these frequencies. Atmospheric Refraction 79. Atmospheric refraction sometimes occurs in certain meteorological conditions, and produces a situation known as ducting. This is discussed in detail at a later stage. Propagation Paths 80. Chapter 1 Page 57 Six of the possible paths which may be taken by a radio wave are discussed below. © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory The Direct Wave 81.

Demodulation is the point at which the intelligence/information is separated from the carrier wave and therefore made available to the recipient. Fading 55. Occasionally radio reception suffers from the effects of fading. g. surface wave and skywave) before meeting at the receiving aerial. If the two signals arrive in phase they will reinforce each other, if they arrive in antiphase they will cancel out; if therefore, in the above example, the ionosphere is fluctuating in intensity and height the path length taken by a skywave will vary continuously, leading to fading in and out of the signal.

Chapter 1 Page 47 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory FIGURE 1-25 Variation in Current with Frequency Chapter 1 Page 48 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory FIGURE 1-26 Variation in Impedance with Frequency Chapter 1 Page 49 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory Bandwidth 53. Parallel circuits reject signals near to the resonant frequency. 707 of its maximum value. See Figure 1-27. FIGURE 1-27 Bandwidth in a Parallel LCR Circuit Chapter 1 Page 50 © G LONGHURST 1999 All Rights Reserved Worldwide Basic Radio Theory Bandwidth B = F2 – F1 In some circuits a wide bandwidth is required and one way to achieve this is to connect a resistor across the parallel circuit.

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Basic Radio Theory Tutorial - PPSC


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