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The bandwidth of the signal is 146.526 â 146.514 = 0.012 MHz, or 12 kHz. VHF Repeater FM Phone Signal: The question specifies a âVHF repeater FM phone signal.â The VHF portion indicates operations on the 6-meter, 2-meter, or 1.25-meter bands. Beyond the fact that FM phone signals are commonly used on the three VHF amateur bands this information is mostly irrelevant.
For example [2], in North America, the maximum frequency deviation, â f, is 75 kHz for commercial FM broadcasting. If the maximum message frequency is equal to 15 kHz for audio, then Î²= kHz kHz =75 15 5, and the FM bandwidth is BW FM = + 2(5 1)15 kHz =180 kHz.This is close to the allotted 200 kHz channel bandwidth.he FCC has set modulation limits of 100% modulation (an instantaneous frequency deviation of 75 kHz corresponds to a 100 percent modulation) for stereophonic transmission and up to 110. percent modulation for SCA multiplex subcarriers under certain conditions [5].