FM radio stations end in odd numbers to prevent interference. The reason they are odd numbers rather than even numbers is that 1 (odd number) is the first number we start counting from, not 0 (even number).
FM radio stations in the U.S. transmit in bands between 88.0 megahertz (MHz) and 108.0 MHz. Inside this band, each station occupies a 0.1 MHz (100 kilohertz (kHz)) section. Each of these sections starts and ends on odd number boundaries.
This means there can be a radio station at 88.1 MHz, 88.3 MHz, 88.5 MHz, and so on. Skipping over the even-numbered radio stations (88.2, 88.4, 88.6, etc. ) was done by the FCC to prevent radio stations from interfering with one another. Radio stations that are only 0.1 MHz (100 kHz) apart tend to bleed into each other more often.
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- HowStuffWorks – Why do all FM radio stations end in odd numbers?