A summary of Southern California-related business litigation developments during the past week.

‘Noise-Free’ Radio Signal: Korean Community Broadcasting Inc. has sued California Broadcasting Group for more than $5 million, alleging that it breached a contract to provide a 20,000-kilowatt “noise-free” radio signal. The Los Angeles Superior Court suit contends that California Broadcasting Group agreed in August to provide a “clean, static and noise-free radio broadcast signal” over which Korean Community Broadcasting could broadcast at 10,000 kilowatts. The suit said California Broadcasting Group agreed to boost the frequency to 20,000 kilowatts by February. Korean Community Broadcasting paid $310,000 for the contract, hired employees and incurred overhead costs exceeding $50,000 a month, the suit said. It said California Broadcasting Group breached the agreement in November by failing to provide a clean signal and in December by disclosing that it could not buy the equipment needed to boost the signal. (Case No. BC017876. Filed Dec. 26, 1990.)