CFR > Title 47 - Telecommunication > CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION > SUBCHAPTER C—BROADCAST RADIO SERVICES (Parts 70–79) > PART 74—EXPERIMENTAL RADIO, AUXILIARY, SPECIAL BROADCAST AND OTHER PROGRAM DISTRIBUTIONAL SERVICES > SUBPART F—Television Broadcast Auxiliary Stations (§74.600 to §74.690) > 74.643—Interference to geostationary-satellites.