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What is the deviation ratio of an FM phone transmitter having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation rate of 3.5 kHz?
2.14
Deviation Ratio = Maximum Permitted Frequency Deviation (Δf_max) / Maximum Modulating Frequency (fm_max). Ratio = 7.5 kHz / 3.5 kHz ≈ 2.143.
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