Pioneer Inventor Is Conducting a Radio Movie Station (Feb, 1930)

M0re information on the good Dr and his inventions may be found here.

Pioneer Inventor Is Conducting a Radio Movie Station

DR. C. FRANCIS JENKINS, noted Washington scientist and pioneer in the field of radio vision, is now conducting a new high powered transmitting station near Washington, for the broadcasting of motion pictures by radio. Opening of his station was preceded by broadcasts from his laboratory for several months. The station was originally assigned to operate on a frequency of 2850 kilocycles with a power of 1.5 kilowatts. Dr. Jenkins has developed an instrument which changes the lights and shadows of the motion picture film into electrical impulses which operate the radio transmitter. The broadcasting equipment which is decidedly intricate includes a photo electric cell and a series of lenses for focussing.

3 comments
  1. MikeBurdoo says: January 17, 201210:19 am

    Don’t see how he could get the bandwidth to transmit motion pictures at that low frequency. Sounds like he used the scanning disk to transmit single frames.

  2. Mike Brown says: January 17, 201210:43 am

    Jenkins pioneered mechanical scanning television in the US. He had many patents on radiovisors, as he called them, including 1,544,156 which issued in 1925. The earliest broadcasts were just silhouettes, but by the time of this article he was broadcasting grayscale images.

    The moving image was sent at about 40-48 lines of resolution at 15-18 frames per second, as far as I’ve been able to determine. That would have reduced the required bandwidth to something possible to transmit at 2.8MHz and receivable on an ordinary amateur radio receiver of the day.

  3. Jari says: January 17, 201211:04 am

    W3XK (Jenkins’s TV-station) transmitted 48 lines x 15 pictures per second, according to this: http://www.tvhistory.tv…

    Of course, the picture quality was what it was from a mechanical system at the time.

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