Regulations last checked for updates: Feb 10, 2026

Title 47 - Telecommunication last revised: Feb 05, 2026
All TitlesTitle 47Chapter IPart 74Subpart F - Subpart F—Television Broadcast Auxiliary Stations
View all text of Subpart F [§ 74.600 - § 74.690]
§ 74.663 - Modulation limits.

If amplitude modulation is employed, negative modulation peaks shall not exceed 100%.

[45 FR 78694, Nov. 26, 1980]
authority: 47 U.S.C. 154,302a,303,307,309,310,325,336
cite as: 47 CFR 74.663
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