Maximum allowable frequency deviation for VHF marine radios is:

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Multiple Choice

Maximum allowable frequency deviation for VHF marine radios is:

Explanation:
Frequency deviation is how far the transmitter’s carrier frequency can swing from its center during FM modulation. For VHF marine voice operation, the standard maximum deviation is plus or minus 5 kHz. This limit keeps the signal within its assigned channel and helps prevent interference with adjacent channels that are spaced 25 kHz apart. If deviation were larger, the signal would occupy more bandwidth (roughly modeled as B ≈ 2Δf plus the audio content), increasing the risk of bleeding into neighboring channels. A deviation of only 2.5 kHz would be unnecessarily narrow for typical voice quality, while deviations of 15 kHz or 25 kHz would be far too wide for the standard VHF marine channel plan.

Frequency deviation is how far the transmitter’s carrier frequency can swing from its center during FM modulation. For VHF marine voice operation, the standard maximum deviation is plus or minus 5 kHz. This limit keeps the signal within its assigned channel and helps prevent interference with adjacent channels that are spaced 25 kHz apart. If deviation were larger, the signal would occupy more bandwidth (roughly modeled as B ≈ 2Δf plus the audio content), increasing the risk of bleeding into neighboring channels. A deviation of only 2.5 kHz would be unnecessarily narrow for typical voice quality, while deviations of 15 kHz or 25 kHz would be far too wide for the standard VHF marine channel plan.

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