According to S. E. Frost's 1937 Education's Own Stations, the station operated by the Iowa State College for these Morse code broadcasts was 9YI, which operated under a Technical and Training School licence.
 
The Electrical Experimenter, September, 1916, page 548:

250  AMATEURS  TAKE  REPORTS  IN  IOWA.

    There are now more than 250 amateur wireless stations in the state of Iowa, according to Professor C. A. Wright of Ames. Practically all are receiving the weather and news reports sent out twice daily from the big wireless station at Ames.
    "It is our intention to continue the news service right on through the season," says Professor Wright. "The service is to be improved as soon as feasible and blanks furnished those who want them for bulleting news sent out." The idea of adding general news items to the college news furnished is being favorably considered.