It call sign started with letter K, like radio stations in the U.S. West Coast. RH stands for Radio Heacock, after H. E. Heacock, an American jewelry dealer and original owner of H.E. Heacock Company, the largest chain of department stores in the Pacific Rim.
Ang call sign nito ay nag-uumpisa sa letrang K, tulad ng mga istasyon ng radyo sa US West Coast.