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Part 15 of the Federal Communications Commission (FCC) rules allows some low-powered radio devices to operate without a license on the AM and FM radio broadcast bands. These devices are subject to certain restrictions, including:
Range: On FM frequencies, the effective service range is limited to about 200 feet (61 meters).
Field strength: The field strength should not exceed 250 ?V/m (48db) at 3 meters.
Detachable antennas: Part 15 rules prohibit detachable antennas on all Part 15 transmitters.
Some examples of Part 15 radio stations include:
Microbroadcasting
Often used by hobbyists, drive-in theaters, or on college or high school campuses.
Talking roadsigns, talking houses, or talking billboards
These transmitters air a repeating loop of information, such as traffic or highway construction. They typically operate on empty channels on the AM broadcast band.
InfOspot
A custom product that can include special audio systems, USB / internet connectivity, cabinets, and antenna mounting styles.
Free-radiate AM radio stations
Educational institutions can use a transmitter without a license if the signal coverage is limited to their property.
5. TIS (Travellers Information Stations)
1610 kHz with low power, usually around 10 watts, such as the one I hear near the Blue Water Bridge between Sarnia, Ontario and Port Huron, Michigan
6. Expanded AM broadcast band
Over a quarter century ago, these frequencies began to be used in the U.S. by BCB stations. I still have recordings of a half dozen of these from the early days.
WTDY 1670:
WNML 1670:
WMDM 1690:
KCNZ 1650:
KCJJ 1630:
KBGG 1700:
Also, here is a link to a column in Popular Communications magazine from February 1998.
Many thanks to SWLing Post contributor and noted political cartoonist, Carlos Latuff, who shares illustrated radio listening report of a recent broadcast of African News Panorama via Vatican Radio.
Carlos notes:
Vatican Radio’s African News Panorama, in English.
Angola parliament debates on banning the sale of alcoholic beverages in some places, African Union’s Extraordinary Summit on Agriculture in Uganda, Benin’s National Army attacked by Islamic militants. Listened in Porto Alegre.
Vatican Radio’s African News Panorama, in English.
Ivory Coast’s Alassane Outtara would like to continue serving his country as president, Mozambique opposition leaders Venancio Minolane returns from self-exile, Ghana’s new president names finance minister, Chad foiled effort to destabilize the country. Listened in Porto Alegre, Brazil
Vatican Radio’s African News Panorama, in English.
The US has accused the Sudanese Rapid Response Forces of genocide, African-Americans in Ghana, Somalia talks with Egypt over the new African Union’s peacekeeping mission. Listened in Porto Alegre, Brazil.
Vatican Radio’s African News Panorama, in English. Earthquake, volcano eruption in Ethiopia, migrant boat shipwreck in the Mediterranean, people flee Mozambique due election unrest, Mauritius’ central bank governor released on bail, China foreign minister to visit Namibia, Republic of Congo, Chad and Nigeria. Listened in Porto Alegre.
Hey Thomas my friend, wish you, your family and the SWLing Post community a happy 2025.
Full news bulletin of KBS World Radio (in Spanish), with focus on the tragic plane crash in South Korea that killed 179 passengers. Listened in Porto Alegre, Brazil.