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Cable loss
Apply a data-sheet attenuation to your length and power.
HB3YAQ · Ajdin HadzicLearning to take awayhttps://hb3yaq.ch/en/tools/cable-loss
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Formula & context
A = a · L / 100; Pout = Pin · 10^(−A/10)
Take attenuation at the intended frequency from the cable data sheet. This calculator scales it linearly with length and calculates remaining power.
A worked example
8.5 dB/100 m and 20 m give 1.7 dB. About 67.61 W remains from 100 W.
Assumptions & limits
Assumes a matched line. Connector loss, ageing, moisture and additional mismatch loss are excluded. 8.5 dB/100 m is an example, not a claim about a cable model.
Coaxial cable: loss and electrical lengthUnderstand the reasoning →From reading to experimenting
Cable loss
8.5 dB/100 m and 20 m give 1.7 dB. About 67.61 W remains from 100 W.
Open example with starting values →Attenuation at your frequency: 8.5 dB/100 m · Cable length: 20 m · Input power: 100 WBack to the learning article →Then change exactly one value. Compare the result and use the formula to explain why it changes. The model limits below the calculator also apply here.