4.18 Wideband FM is to be generated from narrowband FM using the indirect method of Figure...
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4.18 Wideband FM is to be generated from narrowband FM using the indirect method of Figure 4.10. For the narrowband FM, fet = 125 kHz and Af₁ = 30 Hz. For the desired wideband FM, f. = 80 MHz and Af = 48 kHz. (a) Suppose the largest multiplication factor allowed for an individual multiplier is 5, and n₁ = n₂. Complete the design of the indirect WBFM generator by specifying the constituent multiplying factors for n, and n₂, and by specifying the two possible local oscillator frequencies. (b) Repeat part (a) if only frequency doublers and triplers are allowed, n₁ and n₂ should be as close in value as possible but are not necessarily equal, and the frequency deviation of the WBFM may be higher or lower than, but should be as close as possible to, the desired value of 48 kHz. (c) Determine a new value of Af, such that with the values of n, and n₂ found in part (b), the frequency deviation of the WBFM will be the desired 48 kHz. 4.18 Wideband FM is to be generated from narrowband FM using the indirect method of Figure 4.10. For the narrowband FM, fet = 125 kHz and Af₁ = 30 Hz. For the desired wideband FM, f. = 80 MHz and Af = 48 kHz. (a) Suppose the largest multiplication factor allowed for an individual multiplier is 5, and n₁ = n₂. Complete the design of the indirect WBFM generator by specifying the constituent multiplying factors for n, and n₂, and by specifying the two possible local oscillator frequencies. (b) Repeat part (a) if only frequency doublers and triplers are allowed, n₁ and n₂ should be as close in value as possible but are not necessarily equal, and the frequency deviation of the WBFM may be higher or lower than, but should be as close as possible to, the desired value of 48 kHz. (c) Determine a new value of Af, such that with the values of n, and n₂ found in part (b), the frequency deviation of the WBFM will be the desired 48 kHz.
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Fundamental Managerial Accounting Concepts
ISBN: 978-0078110894
6th Edition
Authors: Edmonds, Tsay, olds
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