Engineering:Reference distance
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In broadcast engineering, the reference distance is the distance at which a radio station signal is predicted to reach a service contour under standard propagation conditions. For FM broadcasting, this typically corresponds to the 1 mV/m (60 dBµ) contour under average terrain and normal atmospheric conditions.[1]
This reference distance primarily depends on the station’s effective radiated power (ERP) and height above average terrain (HAAT), with adjustments applied according to Federal Communications Commission (FCC) propagation charts ensuring that the station does not exceed licensed limits.[2]
References
- ↑ Power and antenna height requirements. (regulation). U.S. Government Publishing Office (GPO). 47 CFR § 73.211. https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C/part-73/subpart-B/section-73.211. Retrieved 2026-03-12.
- ↑ Engineering charts (regulation). U.S. Government Publishing Office (GPO). 47 CFR § 73.333. https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C/part-73/subpart-B/section-73.333. Retrieved 2026-03-12. "This section consists of engineering propagation charts (Figures 1, 1a, 2, etc.) used in broadcast coverage and contour prediction under Part 73."
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