TELEVISION DISPLAY FOR NIMBUS-TIROS PICTURE TRANSMISSION SYSTEM. INFORMATION OBTAINED FROM WEATHER SATELLITES REQUIRES RAPID PROCESSING TO BE USEFUL IN METEOROLOGICAL FORECASTING,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO)
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There were two principal objects in view first, to provide the Meteorological Service with the earliest opportunity to study these directly transmitted pictures, and, second, to explore the possibilities of kinescope-camera display of data as opposed to facsimile display, with a view to possible production by Canadian industry for Canadian and foreign use. One of the advantages attendant on the use of magnetic tape and kinescope is that the reproducing electron beam can be programmed. As it turned out the camera tube is sensitive to changes in the magnetic field resulting from the spin of the satellite relative to the earths magnetic field. This effect imposes a regular deflection on the reading beam, leading to a scalloping of the received picture. It is possible, by the addition of an opposing deflection during the play back to provide some cancellation of this effect. It is claimed that the flexibility, reliability and simplicity of the tape-recorder kinescope combination have been proved, and sufficient experience has been obtained to enable a greatly improved kinescope to be designed.