Editing Low-power broadcasting (section)

===AM radio===
{{see also|AM broadcasting#Microbroadcasting}}
The acronym 'LPAM' is not a legal term in the United States and is only used as an acronym. Unlike LPFM stations, which have legal and regulatory status, FCC rules do not define "LPAM" nor issue licenses for low-power AM transmission. LPAM is only an acronym applied to licensed low-power AM operations and to [[Title 47 CFR Part 15|Part 15]] transmissions as well.

Any use of the term "low power AM" in FCC licensing for United States stations is the requirement for higher-power licensed AM stations to reduce their transmit power at nighttime – post-sunset / pre-sunrise – as a condition of their high-power broadcast authorization. There is a category ''class&nbsp;D'' for AM broadcast licenses, which limited stations to daytime-only transmission before regulations changed in the 1980s. Many, but not all, class&nbsp;D stations have been granted authority to broadcast at night with enough power to be heard within a few miles of their transmitters.

Other LPAM operations are known as [[Travelers' Information Stations]] (TIS), sometimes also called highway advisory radio (HAR). Authorized under FCC Part 90.242, these are stations licensed to local transportation departments or other governmental or quasi-governmental agencies to provide bulletins to motorists regarding traffic conditions. These are often near highways and airports, and occasionally other tourism attractions such as [[national park]]s. Some are used by chemical and nuclear facilities for emergency evacuation information systems, others by public safety entities for mobile operations.

Music is not allowed on TIS/HAR stations, and they are restricted to only 3&nbsp;kHz wide, "[[High fidelity|low-fidelity audio]]", compared to the 10&nbsp;kHz audio for standard AM broadcasters and 15&nbsp;kHz audio permitted on FM stations. (Modern AM stations in the US actually restrict their audio from 5&nbsp;kHz down to 2.5&nbsp;kHz - roughly the same as to TIS stations.<ref>{{cite web |title=5 kHz audio bandwidth on AM |website=Radio World (radioworld.com) |date=October 20, 2004 |url=https://www.radioworld.com/tech-and-gear/5-khz-audio-bandwidth-on-am}}</ref> [[Travelers' Information Stations|TIS]] transmissions are normally authorized for 10&nbsp;watts or less, although some higher authorizations exist, primarily in locations where emergency evacuation may become necessary. The 60&ndash;watt TIS stations on 1640 and 1680&nbsp;kHz at [[Dallas/Fort Worth International Airport]]<ref>{{cite web |title=Dallas / Fort Worth International Airport radio station WPLR660 authorization |date=May 27, 2015 |orig-year=2012-12-20 (grant date) |id=file nr.&nbsp;6816465, [[call sign]] WPLR660, 1.680&nbsp;MHz |website=fcc.gov |place=Washington, DC |series=Public Safety and Homeland Security Bureau |publisher=U.S. [[Federal Communications Commission]] |format=PDF |url=http://wireless2.fcc.gov/UlsApp/letterPdf/LetterPdfController?licId=1236825&letterVersionId=52&autoLetterId=0&letterCode=AZ&radioServiceCode=PW&op=LetterPdf&licSide=Y&letterTo=L%20%20%20%20&archive=nul |quote=60&nbsp;Watts [[Effective Radiated Power|ERP]]}}</ref> have the highest licensed power among full-time TIS stations.