KGNU 1390 AM: A History of Radio Evolution in Denver and Boulder
The story of 1390 AM is a fascinating journey through the shifting landscapes of American broadcasting. From its origins as a classical music outlet in the 1950s to its current role as a community-driven variety station, the frequency has mirrored the changing tastes and economic realities of the Colorado radio market.
The Early Years: KFML and the Classical Era
The station was first licensed on April 4, 1956, under the call sign KFML. Owned by Evert A. Bancker Jr., the station initially broadcast a classical music format, which was simulcast on 98.5 KFML-FM. In its early days, the station operated with 1,000 watts of power, limited to daytime hours only.
Ownership changed hands several times during the 1960s. In 1961, the Fine Arts Broadcasting Company purchased the AM and FM stations for $118,720. By 1964, the station's power was increased to 5,000 watts. In 1966, O'Fallon–O'Connor Broadcasting Inc. acquired the stations for $165,000, and by 1969, Joseph R. McGoey gained controlling interest for $96,250.
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Transition to Progressive Rock
As musical tastes evolved, so did KFML. In 1971, the station pivoted to a progressive rock format. This era of growth culminated in 1975 when the station was sold to Radio Denver Corp. for $200,000.
The Golden Bear Era and Format Shifts
In 1982, Golden Bear Communications purchased the station for $760,000. This period was marked by rapid identity changes. The station first became KJJZ with a jazz format, then shifted to KPPL in 1984, adopting an urban contemporary format. However, financial instability followed; Golden Bear Communications filed for Chapter 11 bankruptcy on July 31, 1985, which was later converted to Chapter 7 on October 10, 1985.
From Health Talk to Heavy Metal
The late 1980s saw the station cycle through several niche formats. In 1987, the Huttner Health Network bought the station for $265,000, renaming it KMDK and branding it "K-Medic" to air health-talk programming.
The identity shifted again in June 1988. After a brief stint as KFTO, the station became KDZR. Initially, it served as an affiliate of Z Rock, broadcasting heavy metal and hard rock. By November 14, 1988, it pivoted once more, becoming an affiliate of the Business Radio Network to provide business talk.
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The KJME Period and Regulatory Challenges
In 1989, the station was renamed KJME and began broadcasting in Spanish. Jo-Mor Communications purchased the station in 1990 for $350,000. This era was not without controversy; in 1991, the station was fined $5,000 for operating at 450% in excess of its licensed power.
The Rise of KGNU Community Radio
While the AM frequency was changing hands, KGNU-FM had already established itself, beginning broadcasts on May 24, 1978, from a small cottage along Boulder Creek. In 2004, the Boulder Community Broadcast Association expanded its reach by purchasing AM 1390 KJME in Denver for $4.1 million, officially changing the call sign to KGNU.
Today, KGNU employs a variety radio format—a diverse programming style featuring a mix of music, news, and information. The station is characterized by its community roots, with local shows hosted by volunteers and syndicated content from the BBC World Service, Pacifica Radio, and Public Radio International. KGNU is also a founding member of the Grassroots Radio Coalition, established in 1996.
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Growth and Modern Facilities
KGNU has continued to grow its infrastructure and community presence. In 2001, the station moved to a new building at 4700 Walnut St. In 2018, the Museum of Boulder hosted a six-week exhibit titled "Listening Together" to celebrate the station's 40th anniversary.
To ensure its future, the station launched a capital campaign in 2019 to raise $1.25 million, with a matching grant from the City of Boulder via the 2017 Community, Culture and Safety Tax. This growth culminated on May 22, 2026, when KGNU opened new facilities on 14th Street in downtown Boulder.
Key Facts
- Original License: Issued April 4, 1956, as KFML.
- Highest Purchase Price: $4.1 million by Boulder Community Broadcast Association in 2004.
- Format Evolution: Classical → Progressive Rock → Jazz → Urban Contemporary → Health Talk → Heavy Metal → Business Talk → Spanish → Variety.
- Community Focus: KGNU utilizes volunteer hosts and is a founding member of the Grassroots Radio Coalition.
- Recent Milestone: Opened new downtown Boulder facilities on May 22, 2026.
| Call Sign | Primary Format | Notable Event/Owner |
|---|---|---|
| KFML | Classical / Progressive Rock | First licensed in 1956 |
| KJJZ | Jazz | Acquired by Golden Bear Communications (1982) |
| KPPL | Urban Contemporary | Golden Bear bankruptcy (1985) |
| KMDK | Health Talk ("K-Medic") | Owned by Huttner Health Network (1987) |
| KDZR | Heavy Metal / Business Talk | Z Rock and Business Radio Network affiliate |
| KJME | Spanish Language | Sold to Jo-Mor Communications (1990) |
| KGNU | Variety | Purchased by Boulder Community Broadcast Association (2004) |
Frequently Asked Questions
When did 1390 AM first begin broadcasting?
The station was first licensed on April 4, 1956, operating under the call sign KFML.
What is a variety radio format?
A variety radio format is a diverse programming approach that mixes music, news, and information, often featuring a blend of local volunteer-hosted shows and syndicated content.
Why was the station fined in 1991?
While operating as KJME, the station was fined $5,000 for broadcasting at 450% in excess of its licensed power.
How is KGNU funded and supported?
KGNU is supported by the Boulder Community Broadcast Association and has benefited from capital campaigns, including a matching fund from the City of Boulder through the 2017 Community, Culture and Safety Tax.
Who provides the syndicated programming for KGNU?
The station carries programs distributed by the BBC World Service, Pacifica Radio, and Public Radio International.