TUDN Logo.svg
Broadcast areaDenver metropolitan area
Frequency1090 kHz
BrandingTUDN Radio Denver
FormatSpanish Sports
AffiliationsTUDN Radio
First air date
September 12, 1972 (as KAAT)
Former call signs
KAAT (1972–1979)
KLDR (1979–1984)
KLSZ (1984–1985)
KLSC (1985–1987)
KYBG (1987–1996)
Technical information
Facility ID10057
Power50,000 watts day
500 watts night
Transmitter coordinates
39°39′53″N 104°39′24″W / 39.66472°N 104.65667°W / 39.66472; -104.65667

KMXA (1090 kHz) is a commercial AM radio station licensed to Aurora, Colorado, and serving the Denver metropolitan area. It broadcasts a Spanish-language Sports format and is owned by Entravision Communications Corporation.

KMXA broadcasts at 50,000 watts by day, the maximum power for FCC-licensed AM radio stations. But because AM 1090 is a clear channel frequency, reserved for Class A stations KAAY Little Rock, WBAL Baltimore and XEPRS Tijuana, KMXA must greatly reduce power at night to 500 watts to avoid interference. It uses a directional antenna at all times.


On September 12, 1972, the station went on the air as KAAT, originally licensed to Denver.[1] It was powered at 50,000 watts, but was a daytimer, and was owned by the Colorado Radio Corporation.

In 1978, Colorado Radio Corporation sold KAAT to Leo Payne Broadcasting. On January 2, 1979, KAAT became KLDR (now used by a station in Medford, Oregon). The station's format was current and oldies top 40, with the playlist totally determined by listeners' requests. It promoted itself as "Colorado's all-request station." KLDR also carried broadcasts of Colorado State Rams football.

1984 saw KLDR become KLSZ, a call sign modified to KLSC on September 25, 1985. In 1987, KLSC became KYBG (known as "KBIG"), the first all-sports radio station west of the Mississippi River, which was on air in the late 1980s and early 1990s. Irv Brown was an early host on the station as well.

On December 29, 1995, KYBG dropped the sports format and began simulcasting KQKS.[2]

In August 1996, after being sold to EXCL Communications (which later became Entravision), KYBG flipped to Spanish-language programming as KMXA.

In 2009, the station began simulcasting sister station KXPK 96.5 FM. Later, the station broadcast the 'Jose' Spanish Oldies format.

Up until the 2012 season, KMXA carried live play-by-play of the Colorado Rockies of Major League Baseball.

On June 3, 2015, the station flipped to Entravision's "Super Estrella" Spanish CHR format.

On January 10, 2018, as part of a company-wide change, KMXA dropped the "Super Estrella" format (KJMN would also drop the "Jose" format) and flipped to an 80s/90s Spanish adult contemporary hits format as "La Suavecita."[3]

On January 21, 2019, KMXA split from its simulcast with KJMN and switched to ESPN Deportes Radio Spanish sports.[4] Over the weekend of August 31, 2019, the station dropped ESPN Deportes ahead of the network's September 8 closure. The station played ranchero and norteno music as "José 1090AM". It has since returned to Spanish sports with programming from TUDN Radio as of August 2020.

Previous logos

Maria 1090.png


  1. ^ Broadcasting Yearbook 1973 page B-31
  2. ^ "'KBIG' the loser in sports talk war; New owners to change focus", The Denver Post, December 30, 1995.
  3. ^ Entravision Brings La Suavecita to 11 Markets
  4. ^ ESPN Deportes Returns to Denver Radioinsight - January 21, 2019