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KSFI
Salt Lake City, Utah;
Broadcast area	Salt Lake City-Ogden-Provo, Utah
Frequency	100.3 MHz (HD Radio)
Branding	FM 100.3
Programming
Format	Adult contemporary
Subchannels	HD2: Sunday Sounds (worship music)
Ownership
Owner	Bonneville International; (Bonneville International Corporation);
Sister stations	KRSP-FM, KSL (AM), KSL-FM, KSL-TV
History
First air date	December 26, 1946; 77 years ago (as KSL-FM)
Former call signs	K47SL (1940–1943); KSL-FM (1943–1978)
Call sign meaning	Simmons Family Inc. (former owners)
Technical information
Facility ID	60452
Class	C
ERP	25,000 watts
HAAT	1,140 meters (3,740 ft)
Links
Webcast	Listen live; Listen live (HD2)
Website	fm100.com

KSFI (100.3 FM) is a radio station in Salt Lake City, Utah, United States. KSFI maintains studio facilities located at the KSL Broadcast House building in Salt Lake City's Triad Center (which also house KRSP-FM and the KSL-AM-FM-TV partners), and its transmitter is located on Farnsworth Peak in the Oquirrh Mountains, southwest of Salt Lake City.

History

On October 31, 1940, the Federal Communications Commission (FCC) awarded the first fifteen commercial FM station construction permits, including an assignment for Salt Lake City on 44.7 MHz to the Radio Service Corporation of Utah, which was also the licensee of AM station KSL.^[1] The FM station was issued the call sign K47SL.^[2]

There were numerous delays before broadcasting began. In early 1941, the FCC began an investigation whether newspaper ownership of radio stations should be restricted,^[3] which put K47SL's authorization on hold, because approximately twenty percent of Radio Service Corporation of Utah stock was held by the publisher of the Salt Lake Tribune and Salt Lake Telegram newspapers.^[4] As of June 1943, K47SL was included in a list of "other construction permit authorizations outstanding for FM stations not on the air".^[5]

Effective November 1, 1943, the FCC modified its policy for FM call letters,^[6] and the station was assigned new call letters of KSL-FM.^[7] Equipment and staffing shortages resulted in additional delays, until the station commenced broadcasting on December 26, 1946, at 100.1 MHz,^[8] quickly changed to 100.3 MHz.

Originally owned by the Deseret News, it became a part of Bonneville International when the Latter Day Saints Church formed it as the parent of its broadcasting outlets in 1964. "FM 100" was a pioneer of Bonneville's "beautiful music" format, but in late 1977 it was sold to Simmons.^[9]

Simmons changed the call letters to KSFI (Simmons Family Incorporated) on January 6, 1978, and began adding more vocal selections to the music mix, eventually evolving the format to soft adult contemporary. Bonneville reacquired the station (along with Star 102.7 and Arrow 103.5) from Simmons in 2003.^[9] According to the website of its owner, Bonneville International, FM100 is the top-performing adult contemporary station in Utah.

References

^ "New FM Call Letters Proposed", Broadcasting, November 15, 1940, page 77.
^ The initial policy for commercial FM station call signs included an initial "K" for commercial stations located west of the Mississippi River, followed by the last two digits of a station's frequency assignment, with "47" reflecting 44.7 MHz, and closing with a one or two character regional identifier, which for Salt Lake City was "SL".
^ "FCC Starts Newspaper Ownership Drive", Broadcasting, March 24, 1941, page 7.
^ "Newspaper Grants For FM Delayed", Broadcasting, March 24, 1941, page 8.
^ "40 FM Applicants Seek Reinstatement To Keep Files Pending Before FCC", Broadcasting, June 14, 1943, page 22.
^ "Standard Broadcast Station Call Letters for All Outlets Starting Nov. 1, FCC Rule", The Billboard, September 4, 1943, page 7.
^ "New Calls Named For FM Stations", Broadcasting, October 4, 1943, page 49.
^ "KSL-FM Starts; On Air Daily for 6 Hours", Broadcasting, January 6, 1947, page 35.
^ ^a ^b Arave, Lynn. "Bonneville purchase of 15 stations OK'd", Deseret News, December 9, 2003. Retrieved February 26, 2017.