band. The station entered general service providing instructional programming on September 1. In 1945 the FCC announced that, due to interference concerns, it was reallocating the current FM "low band" frequencies to other services and existing FM band stations would be relocated to 88–106 MHz (later expanded to 108 MHz). In July 1946 the FCC directed that FM stations currently operating on 42–44 MHz would have to move to new frequencies by the end of the year, and KALW changed its frequency from 42.1 to 44.3 MHz as an interim step. The station's initial assignment on the new FM band was 91.3 MHz, and a subsequent reallocation in the fall of 1947 reassigned it to its current frequency of 91.7 MHz. KALW was instrumental in helping KQED television sign on the air in 1954 as one of the first non-commercial educational television stations in the country, by providing technical training, studio space, and engineering advice to the KQED founding staff. KALW provided Chinese-language simulcasts of KGO-TV newscasts in the 1970s, before local Asian language newscasts became established. During the 1970s and 1980s KALW also aired live coverage of SFUSD sporting events, the last such regular live coverage of high school sports in San Francisco broadcasting. While KALW's original transmitter had not been used since the switch to the modern FM band in the late 1940s, it was still located at John O'Connell Technical High School until the school was demolished in the mid-1990s. In late October 2006, KALW suffered an antenna malfunction. The station continued to transmit with only three percent of normal power, causing many listeners to think the station had ceased broadcasting, although the audio stream was still available via the website. Fellow public broadcaster KQED-FM allowed KALW the use of their backup transmitter on San Bruno Mountain during the repair process. On November 2, 2006, station general manager Matt Martin posted an update on the station's website explaining the problem and expressing his appreciation to KQED-FM for its technical assistance. The City of San Francisco recognized "KALW Day" on the station's 70th anniversary on September 8, 2011. Ten years later, on the station's 80th birthday, San Francisco mayor London Breed declared September 1 to be "KALW Day". License renewal challenge In 1997, a group of full and part-time KALW employees filed a petition with the FCC to deny renewal of KALW's broadcast license, alleging that station management