The station was first licensed on July 23, 1940, as WJHP on 1290 kHz.[2] It was owned by The Metropolis Company and transmitted with a power output of 250 watts, and the call sign was derived from the initials of company president John H. Perry.[3] By 1941, WJHP was an NBC Blue Network affiliate.[4] Following the NARBA treaty, WJHP obtained a construction permit for the 1320 kHz frequency in March 1941, and the license was officially modified for the station to broadcast on 1320 beginning November 6, 1942.[2]
The station was transferred to the Jacksonville Journal Company in 1952.[2] In 1957, the Jacksonville Journal Company sold WJHP to Radio Jax for $225,000.[5]
On June 6, 1968, WJHP's call sign changed to WVOJ. Four days later, the station was acquired by Victory Broadcasting, which changed the station to a country music format.[6][7] Its slogan was "The Voice of Jacksonville".[6] By 1976, WVOJ became the most popular radio station in Jacksonville.[6]
WVOJ was purchased by Jacor on June 1, 1984, and changed its call sign to WQIK.[8] On April 1, 1994, WQIK became WJGR. WJGR switched callsigns to WBOB on March 1, 2007; WBOB became WJNJ on May 3, 2010.[9]
Norsan Media purchased WJNJ from New Covenant Ministries for $700,000 in 2023. At the time of the sale, the station aired Christian radio programming as "Pure Radio"; the intellectual property of that format was excluded from the deal.[10]
^"This week's receipts: $26 million"(PDF). Broadcasting. Vol. 51, no. 14. April 8, 1957. p. 32. Retrieved September 18, 2022 – via World Radio History.