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THE DEVELOPMENT OF TELEVISION AND RADIOMOVIES
TO DATE
C. FRANCIS JENKINS*
Radiomovies for entertainment in the home have progressed rather satisfactorily during the year. Our audience on 46 meters has grown in a year to some 18,000 or 20,000. To distinguish them from the radio fan with a set which covers only the entertainment band from 200 to 550 meters most of this audience are known as amateurs.
This limitation of visual radio to short wave channels comes about because the Federal Radio Commission does not at present permit visual broadcast in the audible entertainment band. That is the reason we cannot encourage the purchase of a television attachment for your present set.
The surprising quickness with which our radiomovie audience has been built up is largely accounted for by the fact that the amateur already had his radio set for code communication on 40 meters, and all he had to do was to attach a radiovisor to his receiver, tune 6 meters farther along on his dials, and pick up our radiomovies, broadcast from W3XK, Washington. Because we published a broadcast schedule on which he could depend, he rigged up his visual radio receiver with confidence.
Our broadcasts were well received rather widely over the United States, very dependably as far west as Denver; occasionally we got reports from California, Canada, Cuba, and Porto Rico of reception on the 46 meter channel. But as 46 meters gave double images in local territory, we also simultaneously broadcast on 186 meters for Washington, Baltimore, and other nearby receivers. As with audible radio there are locations in which reception is better than in other places.
An amateur in Cold Springs, Iowa, explained that he happened to tune in on our initial radiomovies broadcast, July 2, 1928, and that he had missed very few of our broadcasts since, and then only because of absence from home at our broadcast hour. We believe his reports authentic for we have checked him up; which we easily do by
* Jenkins Laboratories, Washington, D. C. 344