Radio Magazine was one of the earlier technically oriented radio magazines. It began in November, 1921 as the successor to Pacific Radio News, which began publishing in January 1917 and ran until the outbreak of WWI.  By 1929 it had changed to focus on the receiver sales and service trade. In June 1933 focus once again changed to Amateur Radio.  In 1947 it became Audio Engineering and served the high-end audio enthusiast.   The editors were outspoken critics of the ARRL leadership, particularly K. B. Warner.  Many editorials in the early 1930's called for the relocation of the league HQ to the Midwest and the separation of powers that Warner had consolidated upon the death of HPM.