Coax Loss Calculator 🛡️ 100% Client‑Side

SWR · Connectors · 20+ Cables · Loss Chart
Expert Options
~0.1 dB per connector
Total Loss1.2 dB
Efficiency76%
Power at Antenna76 W
Cable Loss1.0 dB

📘 Coaxial Cable Loss Explained

Coax loss increases with frequency and cable length. This tool includes a built‑in database of 20+ common cables and accounts for connector loss and SWR‑induced additional loss.

❓ Frequently Asked Questions

Why does loss increase with frequency?

Skin effect and dielectric losses both increase with frequency. Thicker cables (e.g., LMR‑400) mitigate this.

How does SWR affect loss?

High SWR causes power to reflect back and forth, increasing total dissipation in the cable.

Can I add custom cables?

Yes, use the "Custom Attenuation" field to override the database value.