KJKK (100.3 FM) is a commercial radio station in Dallas, Texas and serving the Dallas/Fort Worth Metroplex. It is owned by Audacy, Inc., and airs an adult hits radio format known as "Jack FM." The station's studios and offices are along the North Central Expressway in Uptown Dallas. KJKK has an effective radiated power (ERP) of 100,000 watts, the maximum for most FM stations. The transmitter site is off Plateau Street in Cedar Hill, amid the towers for several Dallas-area TV and FM stations. KJKK broadcasts in the HD Radio hybrid format, with its HD2 subchannel playing classic country music and sports betting airing on its HD3 subchannel. History 1965-1988: Easy Listening On December 25, 1965, KBOX-FM ("K-Box") first signed on the air as the FM counterpart of KBOX (now KBXD). KBOX-FM played easy listening and occasional jazz music while KBOX (AM) was a Top 40 and then country music giant during the 1960s and 1970s. The stations used the KBOX call sign because they were owned by John F. Box. In 1973, the FM station's call letters switched to KTLC for "Tender Loving Care," a way to describe its beautiful music format. In 1976, the call sign was changed again, this time to KMEZ, carrying new branding as EZ 100. KMEZ also served as the flagship station for Southern Methodist University football. 1988-1999: CHUrban In 1988, KMEZ was purchased by Summit Broadcasting. After the purchase, KMEZ's call letters and easy listening format moved to 107.5 FM. At 12:01 a.m. on December 25, 1988, after two days of stunting with a loop of "Jam On It" by Newcleus, the station changed formats to a mix of CHR and Urban music, commonly called the "CHUrban" format, which is the predecessor of rhythmic contemporary. The station would also change its call letters to KJMZ and branding to 100.3 Jamz. During its time as KJMZ, on-air personality Russ Parr got his start in the radio business before going to Washington, D.C. to host a syndicated morning show, which, at one time, aired on KBFB. In 1995, Granum Communications bought KJMZ and KOAI; Granum tweaked KJMZ's format to adult R&B hits of the last two decades (Urban AC) and renamed the station KRBV, V100, on September 1, 1995. The KJMZ call letters were picked up by a station in Las Vegas (now KMXB). KRBV, along with KXTX-TV, KOAI and KYNG, were impacted by the