Mr. and Mrs. Norman Sobel of Pittsburgh announce the engagement of their daughter, Rachel Sobel, to Nicholas Fobes, son of Mr. and Mrs. W. Stewart Fobes of Minneapolis.

    Rachel, a graduate of the University of Wisconsin, earned a master's degree at Northwestern University. She is a television producer.

    Nick, also a graduate of the University of Wisconsin, is a landscape architect for both commercial and residential properties.

    Rachel is the granddaughter of Florence Gubernick and the late Raymond Gubernick, and Lillian Sobel and the late Harry Sobel of Philadelphia. Nick is the grandson of Mr. and Mrs. John Parbst, and the late Robert and Katherine Fobes.

    Nick, who met Rachel in college, proposed on the beach in Key West, Fla.

    The couple, who lives in Chicago, is planning an October wedding in Pittsburgh.