47 CFR § 80.765 - Effective radiated power.

---
identifier: "/us/cfr/t47/s80.765"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 80.765 - Effective radiated power."
title_number: 47
title_name: "Telecommunication"
section_number: "80.765"
section_name: "Effective radiated power."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "D"
subchapter_name: "SAFETY AND SPECIAL RADIO SERVICES"
part_number: "80"
part_name: "STATIONS IN THE MARITIME SERVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 151-155, 301-609; 3 U.S.T. 3450, 3 U.S.T. 4726, 12 U.S.T. 2377."
regulatory_source: "51 FR 31213, Sept. 2, 1986, unless otherwise noted."
cfr_part: "80"
---


# 80.765 Effective radiated power.

Effective radiated power is used in computing the service area contour. The effective radiated power is derived from the transmitter output power, loss in the transmission system including duplexers, cavities, circulators, switches and filters, and the gain relative to a half-wave dipole of the antenna system.