Feeder and Jumper Loss Calculator
Add up the losses between the radio and the antenna.
Your numbers
Your results
Feeder and Jumper Loss Calculator by TheCalcTools
How the Feeder and Jumper Loss Calculator works
Enter the feeder attenuation per 100 m at your band, the feeder length and jumper losses.
Add connectors at a typical 0.1 dB each.
The tool shows total loss and the power actually reaching the antenna.
The formula
Worked example
Using the default values shown in the calculator:
| Feeder attenuation at your frequency (dB per 100 m) | 4 |
|---|---|
| Feeder length (m) | 40 |
| Jumper loss, both ends (dB) | 0.4 |
| Number of connectors | 4 |
| Loss per connector (dB) | 0.1 |
| Power at the radio (dBm) | 46 dBm |
- Feeder 4 dB/100 m × 40 m = 1.6 dB; jumpers 0.4 dB; 4 connectors = 0.4 dB.
- Total loss = 2.40 dB, so 46 dBm becomes 43.6 dBm (42.5% of the power lost).
Result:
| Total loss (dB) | 2.40 |
|---|---|
| Power at the antenna (dBm) | 43.6 |
| Power lost | 42.5% |
| Power at the antenna (W) | 22.9 |
Frequently asked questions
Why does frequency matter?
Cable loss rises with frequency, so the same feeder loses more at 3.5 GHz than at 900 MHz. Use datasheet values for your exact band.
How can I reduce feeder loss?
Use a larger-diameter cable, shorten the run, or place the radio near the antenna (remote radio head).
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.