Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radio Corporation of the Philippines is the oldest radio network in the Philippines. 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. Few months later, Radio Corporation of the Philippines bought KZKZ AM from Henry Hermann. In 1926 the organization began 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.