Rocky Mountain (Denver) News, February 15, 1920, Automotive Section, page 8:
CONCERT BY WIRELESS PHONE WILL BE GIVEN IN DENVER WEDNESDAY
Forestry Operator Will Send Out Classic and Jazz Music And All Radio Amateurs Can Listen In.
Grand opera music, without the presence of the temperamental diva, an orchestra leader or even a theater has long been commonplace thru the medium of the talking machine. Now H. R. Kylie, telephone engineer of the local forestry bureau, proposes to give a concert over the wireless telephone between 8 o'clock and 9 o'clock Wednesday evening.
"All persons having a receiving circuit are cordially invited to tune in." says Mr. Kylie. "Along with the grand opera we'll send out some jazz, folk songs and instrumental numbers. It's the first thing of its kind as far as I know."
Radio Amateurs Can Hear.
Receiving circuits of wireless telegraph instruments will pick up the sound waves emitted by the wireless telephone. The telephone reciprocates, however, and while the telegrapher gets words he cannot send them and he must answer in the dot and dash language. The telephone receiving circuit readily accepts Marconi. The "medium of exchange" is the same.
The two have a difference in action, despite the fact that they can understand each other. The waves of the wireless telegraph are "interrupted" as they start out, which gives them a jazzy effect. The telephone waves are continuous.
The instruments in use by the foresters here are of standard army model, such as were employed by the signal corps at the front in France. The range is rated at twenty miles, tho, under the most favorable conditions, a distance as great as thirty miles has been recorded.
Uses Extra Amplifier.
To supplement the amplifier of the stock model, Mr. Kylie has invented an extra amplifier which will considerably increase the range of the instrument. More important, how is the purpose for which he designed it. His desire was to perfect the receiving circuit so that calls could be heard clearly. In this he has been remarkably successful.
Recent experiments with the instrument have proven that it is reaching a long distance, and incidentally many antennae of other instruments, mainly telegraph. One purpose of the Wednesday night concert is to obtain a concise record of the powers of the instrument. Every operator is asked to tune in and then file a report of the concert at his station. The music will be furnished by a talking machine loaned by a local music store. The wave length will be set at 500 meters.
Hearers Asked to Report.
Everyone who catches the music is asked to send his name, address, the quality of the reception, whether clear, loud, weak, and a description of the receiving circuit used to Mr. Kylie.
Within a short time one instrument will be placed in a truck and driven away from the city, keeping in communication with the one at the postoffice building, to test the instrument's efficacy for fire fighting assistance in the national forests.
Other states where the forestry service has had many hard fights with the flames annually have been well satisfied with the wireless telephone in the battles with the fire.