The new station, dubbed DBS, at first broadcast via tiny transmitters in each dormitory, each operating on a different frequency. In 1942 this unwieldy arrangement was changed to a "carrier current" system using the college electrical system to reach the dormitories. In 1948 the call letters were changed to WDBS, and in 1958, after considerable controversy, the station obtained a standard AM broadcast license. On March 4, 1958 the students began broadcasting to the entire Upper Valley region as WDCR at 1340 Khz on the dial. Dartmouth Broadcasting launched WFRD (FM Radio at Dartmouth) 99.3 FM on February 19, 1976.