Abstract
IN a previous communication1 a semi-automatic method was described by which curves showing the equivalent height of the reflecting regions of the ionosphere as a function of the frequency of the exploring radio waves could be plotted. In order to increase the flexibility of the method, a new system of electrical linkage between the tuning systems at the transmitter and at the receiver has been developed whereby the receiving installation automatically follows the changes of the sender frequency, so that the two stations maintain synchronism without attention.
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References
NATURE, 133, 66 (1934).
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NAISMITH, R. Apparatus for the Investigation of the Ionosphere. Nature 137, 615–616 (1936). https://doi.org/10.1038/137615a0
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DOI: https://doi.org/10.1038/137615a0
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