KJKK (100.3 FM, "Jack FM") is an American radio station in the Dallas-Fort Worth area of Texas. It broadcasts an adult hits music format. KJKK is owned by CBS Radio and the broadcast license is held by CBS Radio Texas Inc. The station's studios are located along North Central Expressway in Uptown Dallas and the transmitter site is in Cedar Hill.
KJKK started as KBOX-FM ("K-Box"), playing easy listening and occasional jazz music in 1965. Although it was the sister station of KBOX-AM 1480 (now KBXD), a Top 40 and then country music giant during the 1960s and 1970s, the two stations never simulcasted until 1982, when AM 1480 became KMEZ-AM. In 1973, the call letters were changed to KTLC (meaning Tender Loving Care for your ears) while maintaining its easy listening format. Three years later, the callsign was changed once again to KMEZ and carried the new branding EZ 100, while still maintaining the easy listening format and was a flagship station for SMU College football.
In 1988, KMEZ was purchased by Summit Broadcasting. After the purchase, KMEZ moved to 107.5 FM, replacing KDLZ. After two days of stunting with "Jam On It" by Newcleus, the station changed formats to CHR/Urban (also known as a "CHUrban" format, which is the predecessor of rhythmic contemporary) and changed its call letters to KJMZ and branding to The All New 100.3 Jamz at 12:01 a.m. on Christmas Day, 1988. During its tenure as KJMZ, on-air personality Russ Parr got his start in the radio business before going to Washington, DC to jumpstart his syndicated morning show, which, at one time, aired on KBFB. In 1995, Granum Communications (later bought out by Infinity/CBS Radio) bought KJMZ and KMEZ (now KMVK), and tweaked the format to Classic and Modern R&B (Urban AC) and renamed the station as KRBV, V100 on September 1, 1995; the KJMZ calls were picked up by a station in Las Vegas (now KMXB). KRBV was one of four stations (the others being KXTX-TV, KOAI and KYNG) that fell victim to the Cedar Hill tower collapse on October 12, 1996. Three workers were killed and one worker was injured when a gust of wind caught the gin pole being used for construction of a new antenna for KXTX. After the collapse, the stations scrambled to get back on air, and later ended up using an auxiliary site for many months, though at a much reduced power output. Because of this, KRBV never returned to its glory days and the ratings sunk, most of it due to philosophical differences in direction of programming for KRBV.
In 1998, KRBV re-added hip hop in its playlist, and was revamped as Adult Mix V100.3.
The KJMZ calls have since been utilized at an Urban station in Lawton, OK.
On March 12, 1998, the station began stunting by looping songs from artists such as Rob Base and Eminem. Three days later, on March 15, the station changed formats to Rhythmic-leaning Top 40 and renamed the station Hot 100, calling itself DFW's Party Station. On May 28, 2001, at 11 AM, the station changed its name again to Wild 100 while maintaining its Rhythmic-leaning Top 40 format with the first song of Wild being "Wild Thing" by Tone Loc, and became the Dallas affiliate for the Austin-based "J. B. and Sandy" morning show. On March 8, 2002, Wild 100 exhumed an old KLIF stunt by declaring themselves a "thing of the past"; the station went dark for about three hours and came back with the same format and name. That same year, J. B. and Sandy's show was terminated. The station was still under the ownership of Infinity Broadcasting; however, it would become a CBS Radio station when Infinity was renamed.
On the morning of April 1, 2004, as an April Fool's joke, Wild 100's morning show was replaced by a pre-recorded episode of The Russ Martin Show. Later that day, Russ Martin was back on his regular station, Live 105.3, where he got calls from Russ Martin show listeners who thought this change was for good. Little did anyone know a monumental change was on the horizon for 100.3 FM.
Later that year, on July 1, at 8 AM, the station interrupted their morning show and began stunting with a mix of music and soundbites featuring "Jack." At Noon, the station flipped to Adult hits as 100.3 Jack FM, with the first song being "Where the Streets Have No Name" by U2. The KRBV call letters would also be changed to KJKK. For the first 11 years, KJKK was jockless, and rejected all song requests. In late 2015, the station added a full-time airstaff. In the summer of 2016, KJKK dropped the "Playing What We Want" slogan, and changed their slogan to "80's, 90's and More." The station's playlist has a core focus on music from the 1980's.
The KRBV call letters eventually went to a Los Angeles-area station, also at 100.3 FM, but under different ownership. The letters went away again in 2008 to be replaced by KSWD.
KJKK's secondary channel (HD2) was initially launched as "My HD" in 2004. As of early 2008, it currently airs Las Vegas-related jazz standards under the branding "The Sound of The Strip",
KJKK's HD3 signal was launched in late 2010 to broadcast a diverse indie/alternative format known as The Indie-Verse, which was previously dropped from KRLD-FM 105.3 HD2 to make way for the simulcast of all-news radio station KRLD 1080 AM. As of June 1, 2016, it now broadcasts a classic country format.