### To convert a frequency to a channel number:

Take the hundredths number value in the frequency. | (example: in 72.990 MHz, use the 99 part) |

Subtract 21 from this number. | (example:99 - 21 = 78) |

Divide by 2. | (example:78 / 2 = 39) |

Add 21 to the result. | (example:39 + 21 = 60) |

The result is the channel number. | (example: result = 60) |

### To convert a channel number to a frequency:

Subtract 21 from the channel number. | (example: i.e. 60 - 21 = 39) |

Multiply the number by 2. | (example: 39 * 2 = 78) |

Add 21 to this number. | (example: 78 + 21 = 99) |

The result can be found by prepending a "72." in front of this number. | (example: result is 72.990) |

There ya go... Invest in a 'Spread-Spectrum' radio and you'll never have to worry about this!