Engineering Tool · published-design + closed-form · advisory
Feed Line Loss
matched: α = k₁√f + k₂f · total under SWR (ARRL)
Total loss (under SWR)
1.14dB
Matched loss
1.07dB
SWR-added loss
0.07dB
Power to antenna
76.8%
Accuracy note
Matched loss from a two-term fit of published cable curves; SWR-added loss is exact for that matched loss. Real loss drifts with age, temperature, and batch — treat as ±10–20%.
Matched loss from a two-term fit of published cable curves; SWR-added loss is exact for that matched loss. Real loss drifts with age, temperature, and batch — treat as ±10–20%.
Method published-design + closed-form Cite ARRL Antenna Book · cable datasheets