pidpawel / coaxcalculator

Open Source coaxial cable loss calculator

Coax Calculator

Open source coaxial cable loss calculator.

Calculates total loss for various feedlines, based on frequency, length and input power.

How does it work?

The most important part of the calculator is cables file. It contains attenuation data specified by cable manufacturer for various frequencies, extracted from the datasheet:

h155-belden:
  name: H155 (Belden)
  manufacturer: Belden
  type: H155
  attenuation: { 5: 2.5, 50: 6.9, 100: 9.1, 230: 13.4, 400: 18.0, 800: 26.1, 862: 27.3, 1000: 29.6, 1350: 34.9, 1750: 40.3, 2150: 46.0, 2400: 49.1, 3000: 56.3, 4200: 69.1, 5800: 75.1, 5400: 80.8, 6000: 86.5 }
  data_source: https://www.tme.eu/Document/18ee3e29381bee0e348180bedff1050b/H155BK_EN.PDF
  additional_info:
    ext_diameter_mm: 5.4
    velocity_factor: 0.8
    impedance: 50

Since the attenuation is specified for a given frequency values, usually different for every manufacturer, a simple linear interpolation is performed to obtain attenuation values for a frequency of interest.

How to contribute?

If your favourite cable is not on the list, please add it to cables.yaml, including all the fields as in the example above and open a pull request.