 This initial station employed a spark transmitter that could only transmit the dots-and-dashes of Morse code.With the entrance of the United States into World War One in April 1917, all civilian radio stations were ordered to cease operations for the duration of the conflict.In late 1919 the amateur radio ban was ended and Reynolds, who had subsequently moved to Colorado Springs, relicensed his amateur station, which was now issued the call sign of 9JE.