Washington Evening Star, March 11, 1920, page 12:
THIRTY RADIO AMATEURS HEAR RADIO CONCERT
Music Sent Out from National Radio School Strong Enough to Dance By.
Development of radio telephony at the National Radio School, 1345 Pennsylvania avenue, last night reached the stage where thirty amateurs on the receiving ends of wireless apparatus throughout the city reported that they were hearing musical records being played at the schools, under the direction of F. W. Fennimore of the bureau of standards radio research laboratory.
Mr. Fennimore has been aiding in the development of the radio telephone for several weeks, but experiments did not reach the stage of perfection which allowed a general reception of a musical program until last night. Mr. Fennimore called up his wife by radiophone at about 9 o'clock. She replied that she was entertaining company, and requested that a musical number be put on the wireless. According to reports, the music was heard well enough to dance by at the Fennimore home. Shortly after the record was sent out thirty calls from amateurs throughout the city announced that they were "getting it" and listening in.
Announcement was made today that the experiment would be repeated for the benefit of local amateurs tonight between 9:30 and 10:30, as well as tomorrow night during the same period.