## LMR-400 Cable Loss Calculator

## Overview of LMR-400 Coaxial Cable

LMR-400 is a popular 50-ohm coaxial cable known for its low signal loss and high performance in various applications, including Wi-Fi, cellular networks, and amateur radio. Below is a detailed table summarizing the key specifications, characteristics, and attenuation values at different frequencies.

Parameter | Value |
---|---|

Overall Diameter | 0.405 inches (10.3 mm) |

Characteristic Impedance | 50 ohms |

Maximum Voltage Rating | 2500 VDC |

Capacitance | 23.9 pF/ft (78.4 pF/m) |

Inductance | 0.060 µH/ft |

Velocity of Propagation | 84% |

RF Shielding | >90 dB |

## Attenuation Values at Various Frequencies

The following table details the attenuation (signal loss) of LMR-400 cable at different frequencies:

Frequency (MHz) | Attenuation per 100 ft (dB) |
---|---|

10 | 0.4 |

50 | 1.1 |

100 | 1.6 |

400 | 3.9 |

900 | 6.6 |

1000 | 7.1 |

1500 | 9.3 |

2000 | 11.1 |

5800 | 24.4 |

## Key Features of LMR-400

**Construction**: LMR-400 features a solid copper center conductor, foam polyethylene insulation, and dual shielding with bonded aluminum foil and tinned copper braid, which minimizes signal loss.**Flexibility**: While it is less flexible than lighter models like LMR-200 or LMR-100, it provides excellent durability.**Applications**: Ideal for high-frequency applications, including IoT infrastructure and outdoor sensors due to its UV-resistant jacket.

## Factors Affecting Signal Loss

The attenuation of LMR-400 can be influenced by several factors:

**Cable Length**: Longer cables will have higher total loss.**Frequency of Signal**: Higher frequencies increase attenuation.**Temperature**: Elevated temperatures can degrade insulation and increase loss.**Installation Method**: Sharp bends or kinks can lead to additional resistance and loss.

## Conclusion

LMR-400 coaxial cable is an excellent choice for applications requiring minimal signal loss over longer distances. Its robust construction and low attenuation make it suitable for various RF communication needs, particularly in environments where high-frequency signals are prevalent. Understanding its specifications and factors affecting performance can help in making informed decisions for installation and usage.