WZUM (AM)
WZUM (AM)
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WZUM (AM)

WZUM (1550 kHz) is a jazz AM radio station serving the Pittsburgh, Pennsylvania market. The station broadcasts with a power of 1,000 watts daytime (4 watts at night) from studios in South Park, Pennsylvania, and is licensed to Braddock, Pennsylvania.

Before changing to jazz as WZUM, 1550's programming was provided by a format developed by veteran Pittsburgh radio programmer Clarke Ingram.

Before changing to urban oldies in 2013, WZUM, most of 1550's programming was provided by the Lifestyle TalkRadio Network.

WZUM was the "Flagship Station" of the Woodland Hills Wolverine Football Network. A.W. Gusky Productions produced the broadcasts of Woodland Hills High School football.

This station began as WLOA, with the construction permit first applied for on August 13, 1946. The initial permit was for the station to operate at 910 kHz at a power output of 1,000 watts, daytime only, from a transmitter site to be determined in Swissvale. The permit was amended later than November to move from 910 kHz to its current channel of 1550 kHz, daytime only. In December 1946, the transmitter site located on a hill northeast of Braddock was selected and approved by the FCC. In January 1947, the station applied for permission to increase its daytime power from 1,000 watts daytime non-directional to 5,000 watts and add nighttime power using a directional antenna system. That application was dismissed in February 1947.

On May 20, 1947, WLOA signed on the air from its studios at 1233 Braddock Avenue in Braddock, doing business as Matta Broadcasting Company. On June 1, 1959, the station signed on its same-named FM sister, known today as WRRK. The FM provided local radio service after the AM was required to sign off after local sunset.

Before becoming famous, actor George Peppard was a DJ at WLOA and frequently talked about working at the station, including once while delivering the weather, accidentally forecasting "flow snurries" instead of snow flurries.

In 1972, station co-founder William G. Matta, died. Later that year, the station was transferred from his estate to William J. Matta and Mrs. E.R. Matta, with William J. Matta taking full control of the station in 1975. In 1979, the station took the call letters of its sister FM station, by this time known as WFFM, which had adopted them in 1977 and separated itself from its AM sister. The FM station was renamed WFFM-FM and the AM became a full simulcast as WFFM.

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