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After Elshinta Radio was bought (possibly by Salim Group) in the late 1970s, Soejoso Karsono created Radio Suara Irama Indah.[2] Sudibyo Karsono also contributed to Irama Indah radio[3]. Later the radio changed into B-FM and Radio One in the late 1990s.

Radio One started broadcasting in the late 1990s. This radio's audience was young adults, playing classical music. With affiliation to Prambors group in the late 1990s, Radio One was partially owned by Masima Group along with sister station Prambors, Delta FM, Female Radio (acquisition of Tangerang-located station), Bahana 101.8, M97FM (now RDI) and SPFM (now Oz Radio). Radio One once had provincial stations, but they were sold to Masima to create Prambors provincial stations. In 2007, this affiliation led to ownership of Masima Group's 20% share by Mahaka Group. In 2004, the 101.0 FM frequency was first time used, after using 101.25 FM for over a decade. In 2006, management decided to change Radio One branding into 101 Jak FM. Ownership was overtaken by Mahaka group and now they are the sole operators.

Jak FM changed the branding only. Neither DJ's nor music was altered from Radio One. To cater younger and more varied listeners, Jak FM later added new music, mostly Western music. Jak FM slowly reduced classic hits (now on Most Radio) and added new announcers, including morning show DJ Ronal Surapradja and Tike Prie.