 The station signed on August 10, 1948, as WJZ-TV, the first of three television stations signed on by ABC during that same year, with WENR-TV in Chicago and WXYZ-TV in Detroit being the other two.Channel 7's call letters came from its then-sister radio station, WJZ.In its early years, WJZ-TV was programmed much like an independent station, as the ABC television network was still, for the most part, in its very early stages of development; the ABC-owned stations did air some common programming during this period, especially after the 1949 fall season when the network's prime time schedule began to expand.