KMXA 1090 is TUDN Radio Denver, a Spanish-language sports station, and before that it was home to the first all-sports station west of the Mississippi. It signed on September 12, 1972, as KAAT, a 50,000-watt daytimer owned by Colorado Radio Corporation. Leo Payne Broadcasting bought it in 1978, and from 1979 it was KLDR, a listener-request station. After a few more call changes, it became KYBG in 1987, billed as the first all-sports radio station west of the Mississippi.
Sports ended in December 1995 and the station simulcast KQKS. EXCL Communications, later Entravision, bought it in August 1996 and made it Spanish-language KMXA. Since then it has simulcast KXPK, played Spanish oldies, carried Colorado Rockies baseball through 2012, and run Super Estrella (2015), La Suavecita (2018) and ESPN Deportes (2019). TUDN Radio took over in August 2020.
Station information
- Frequency: 1090 kHz.
- City of license: Aurora.
- Signed on: September 12, 1972.
- Branding: TUDN Radio Denver.
- Call history: KAAT (1972–1979), KLDR (1979–1984), KLSZ (1984–1985), KLSC (1985–1987), KYBG (1987–1996), KMXA (1996–present).
- Owner: Entravision Communications.
- FCC facility ID: 10057.
References
Catalog note: The archive’s KYBG page covers the KYBG call sign on 92.1 FM (1989–1995). That’s a separate signal: 1090 AM was KYBG from 1987 to 1996, while the 92.1 FM facility carried KYBG-FM (country and talk) from 1989 to 1995. The overlap was common practice for an AM/FM call-letter pair. Whether the two were simulcast or under shared ownership isn’t confirmed yet.
STATION FILE
FROM THE TIMELINE
Moments in KMXA-AM History
KYBG 1090 goes all-sports
1987 — Denver's 1090 AM became KYBG, billed as the first all-sports radio station west of the Mississippi. Sports lasted until December 1995. The station is now KMXA, which still carries sports, in Spanish.
1090 AM goes Spanish-language as KMXA
August 1996 — EXCL Communications, later Entravision, bought Denver's 1090 AM and turned it into Spanish-language KMXA. It later carried Rockies baseball in Spanish through 2012 and has been TUDN Radio since August 2020.
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