in 1931, westinghouse switched the call letters of its two massachusetts stations, with wbza moving to springfield and wbz going to boston. the two stations had suffered from interference problems, though the boston facility was the more powerful of the two. in 1934, kyw was moved from chicago to philadelphia following a federal communications commission-dictated frequency realignment. westinghouse's next station was its first purchase: wowo in fort wayne, indiana, joined the group in august 1936.