In this article we calculate the distance covered by a 1000 Watt FM Transmitter.

FM transmitters are used in many different broadcast applications. When planning a system a radio engineer needs to know how far a broadcast will reach. We created a tool to make this easy.

**FM Transmitter Range Calculator**

In the calculator below, enter:

**Transmitter power**1000 Watt (converts to 60 dBm)**Receiver sensitivity**(refer to the second table below with dBm values for Rural, Urban or Large City)**Transmit Antenna Gain****Receive Antenna Gain**

**Example Calculation**

According to the ITU, the following table shows required sensitivity in dBuV/m for FM in various environments. We have used the dBuV/m to V/m calculator to convert the units.

Environment | Field Strength (dBuV/m) | Field Strength (V/m) |

Rural | 54 | 0.0005012 |

Urban | 66 | 0.0019953 |

Large Cities | 74 | 0.0050119 |

The field strength is used to calculate the input power at the receiver in dBm. In this case the antenna gain of 0 dBi is used. However you can substitute any value in this calculator. As well, for FM, the frequency range is 88-108 MHz, so we have used 108 MHz in the computation.

Environment | Field Strength (V/m) | Power (dBm) |

Rural | 0.0005012 | -64 |

Urban | 0.0019953 | -52 |

Large Cities | 0.0050119 | -44 |

Note that cities are more challenging RF environments, so the required power is higher relative to a rural environment. There’s a 20 dB difference between the two. These are receiver sensitivity values that can be substituted in the range calculator above.

**What is the Range of a 1000 Watt FM Transmitter?**

Based on the calculation above, the range for different operating environments is:

**Rural – 350 km or 218 miles****Urban – 88 km or 55 miles****Large City – 35 km or 22 miles**

As would be expected the range is the lowest in a city where buildings and other large objects will obstruct the FM signal. This means it will not travel as far in a city as it will in a rural environment.

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