KZKZ (AM) is the second radio station in the Philippines owned by Henry Hermann in 1922. It broadcast with a 5-watt transmitter. In 1924, it boosted its power to 100 watts. A few months later, Radio Corporation of the Philippines bought KZKZ AM from Henry Hermann. In 1926 the organization began to work on constructing two of the largest radio stations in Asia with the idea of maintaining direct Manila-San Francisco service. After Philippine independence, it changed its callsign to DWKZ, but changed in 1960 to DZCA.
In 1929, RCP launched KZRC in Cebu broadcasting with a 100-watt transmitter, but was later sold to store owner Isaac Beck (it is now DYRC owned by the Manila Broadcasting Company). However in 1970, RCP launched DYRB.
In 1960, it launched the first AM station in Region 4 called DZLT 1188. Recently, its transmitter fell during a typhoon. It is already fixing its transmitter & DZLT-AM will resume on October 2008.
Today, the RadioCorp group is composed of 5 broadcast companies: the RadioCorp itself, Philippine Radio Corporation (PhilRadio), Radio Audience Developers Integrated Organization Inc. (RADIO Inc.), Beacon Communications Systems Inc. (BCSI), and Radyo Pilipino Corporation (Radyo Pilipino), Its also produced the weekly business show Asenso Pinoy aired every Saturdays and Sundays on government TV station PTV-4.