Sharing Between Fixed and International Broadcasting - A Time Sharing Example

The United States position for the 1979 World Administrative Radio Conference (WARC-79) proposes sharing of frequency bands by the fixed and international broadcasting services in the High Frequency (HF) bands. In the past, frequency allocations for international broadcasting have been made exclusive due to the high powers employed. A time sharing example is described which assigns geographical areas of operation to each service based upon limiting the hours of operation of each radio service. The impact upon selected domestic fixed circuits by transmissions from several different international broadcast stations is examined.