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City Gilbert, Arizona
Broadcast area Phoenix, Arizona
Branding Hot 97.5/103.9
Slogan Trending Radio
Frequency 103.9 MHz (also on HD Radio)
Translator(s) K241BQ (96.1 MHz, Fort McDowell)
First air date 1981 (as KQEZ)
Format Adult Top 40 (KMVA simulcast)
HD2: Soft AC (KOAI simulcast)
HD3: Rhythmic Contemporary (KKFR simulcast)
Language(s) English
ERP 100,000 watts
HAAT 189 meters
Class C1
Facility ID 54944
Former callsigns KQEZ (1981-1993)
KAZR (1993-1995)
KBZR (1995-1997)
KPTY (1997-2001)
KEDJ (2001-2010)
KEXX (2010-2016)
Owner Riviera Broadcasting
Sister stations KMVA, KOAI, KKFR

KZON (103.9 FM) is a commercial radio station located in Phoenix, Arizona, broadcasting to the Phoenix Metropolitan Area. KZON airs a Hot AC format branded as "Hot 97.5/103.9" (simulcasting with KMVA 97.5 FM Dewey-Humboldt, Arizona). Its studios are located on 7th Street in Midtown Phoenix, while its transmitter is located in San Tan Valley, Arizona.


The station signed in 1981 and located in Coolidge, Arizona. The station aired a country music format and originally adopted the call letters of KQEZ. This lasted until 1994.

In 1994, the country music format was dropped in favor of a classic rock music format complemented by a change of call letters to KAZR. A signal upgrade followed providing the southern sections of the Phoenix, Arizona, area with a clear signal. However, the format change was short lived.

In March 1994, the format was changed to a modern rock/top 40 hybrid branded as “The Blaze”. A change of call letters to KBZR followed the change of format. In the Spring of 1996, the station began moving its transmitter closer to Phoenix. At the same time, the station began a 6-month stunt of an automated Rhythmic Oldies format, only going by the moniker "S.T.E.V.E." The name was an acronym standing for "Songs That Everyone Vociferously Enjoys."

On October 30, 1996, at 3:30 PM, the station completed its upgrade, and flipped to a hip-hop emphasizing rhythmic top 40 as "103.9, Arizona's Party Station". The call letters were changed in the spring of 1997 to KPTY to reflect their station branding. Despite the station's signal limitations, KPTY did very well in the ratings; in fact, rival KKFR, which was airing a broad-based Mainstream Top 40 format at the time, began to move towards a hip hop/R&B emphasizing rhythmic top 40 format as well, and took away much of KPTY's audience. In 1998, the format evolved to a hybrid hip-hop/modern rock format shortly followed by a change of branding to "Party Radio @ 103.9". During the last week of 1999, KPTY stunted a supposed broadcast hijacking with buzzing sounds and audio glitches in the songs, legal IDs, sweepers, and as the DJs were talking. On December 31, 1999, KPTY began stunting with a 24-hour loop of "We Like To Party" by The Vengaboys. On January 1, 2000, it returned to a rhythmic top 40 format (this time with more of a dance lean) as "103.9 The Party".

In October 2001, the station's owners were persuaded by the staff of the original KEDJ "The Edge" on 106.3 FM and 100.3 FM to drop the Rhythmic Top 40 format and bring the KEDJ call letters and its modern format (minus The Howard Stern Show) over to 103.9 FM. KPTY flipped to "The Edge" exactly 5 years after the station began: October 30, 2001 at Noon. The 106.3 FM and 100.3 FM frequencies originally used by "The Edge" were sold to Hispanic Broadcasting Corporation (now Univision Radio) and switched to a Spanish-language format.

In April 2008, the morning show "The Morning Ritual" was dropped in place of the syndicated Adam Carolla Show. The Adam Carolla Show was cancelled on February 20, 2009, due to Carolla's flagship station KLSX-FM flipping formats. It was quickly replaced by another Los Angeles-based morning show, Kevin and Bean.

In July 2009, the station relaunched as "FM/1039...Where Music Matters." FM/1039 Launched under then-Program Director Tim Virgin. That same month, Virgin left to do Afternoons at Q101 in Chicago. Former program director Marc Young returned to the station and took over afternoon duties as well.

On January 8, 2010, the "FM 103-9" branding was changed to "X 103-9...Alternative Rock Now." On February 2, 2010, under the direction of Program Director Marc Young, the station's call letters were changed from KEDJ to KEXX to align with the "X 103.9" branding.

On January 12, 2012, the station dropped alternative rock for classic rock under the name "My 103.9". "Personal Jesus" by Depeche Mode was the last song under their alternative rock format.

As of June 2012, the station turned to a Hot AC format, still under the name "My 103.9."

On December 27, 2013, Trumper Communications and Riviera Broadcasting Group announced that they would merge their Adult Top 40 outlets into one simulcast, with KMVA and KEXX becoming "Hot 97.5/103.9 Trending Radio." The combined signals made their launch on December 31, 2013.

On April 9, 2015, its HD2 digital subchannel became the high definition simulcast of KOAI 95.1 FM Sun City West.

On June 20, 2016, KEXX changed their call letters to KZON.

Weekly program playlist[edit]

  • Vinnie 6am-12pm
  • JT 12pm-3pm
  • Robin Nash 3pm-7pm


KEXX My 103.9 logo.png

External links[edit]

Coordinates: 33°14′49″N 111°31′52″W / 33.247°N 111.531°W / 33.247; -111.531