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Coax Loss Calculator

Estimate feedline loss and remaining power for common coax types.

Cable Type

Cable Length (ft)

GMRS Frequency Preset

Transmit Power (W) — optional

Cable Loss

2.75 dB/100ft

Total Loss

1.37 dB

Power at Antenna

36.4 W

Values are estimates based on typical published attenuation scaled by frequency. Actual loss depends on the specific cable batch, installation, connectors, VSWR, and temperature.

These tools provide estimates and general information for educational and planning purposes. They do not replace FCC rules, official licensing information, equipment documentation, or professional engineering advice. Always operate within applicable laws and regulations.