Tenths digit
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The tenths digit of an FM radio station is the digit that follows the decimal point.
In the United States, frequency-modulated broadcasting stations operate in a frequency band extending from 88.0 MHz to 108.0 MHz, for a total of 20 MHz. It is devided into 100 channels, each 0.2 MHz wide, designated "channel 201" through "channel 300."
To receive a station, an FM receiver is tuned to the center frequency of the station's channel. The lowest channel, channel 201, extends from 88.0 MHz to 88.2 MHz; thus its center frequency is 88.1 MHz. Channel 202 has a center frequency of 88.3 MHz, and so on, up to channel 300, which extends from 107.8 to 108.0 MHz and has a center frequency of 107.9 MHz.
Because each channel is 0.2 MHz wide, the center frequencies of adjacent channels differ by 0.2 MHz. Because the lowest channel is centered on 88.1 MHz the tenths digit of the center frequency of any FM station in the United States is always an odd number.