Abstract
RECORDS of wireless echoes by the group-retardation method of Breit and Tuve1 show that the intensities and number of echoes diminish as the receiver is brought near the transmitter. The minimum distance from the transmitter at which we could detect echoes was 400 metres2. The nearest distance at which interference phenomena between direct and sky waves have ever been noticed seems to be 180 yards3. The difficulty experienced in recording echoes at short distances from the transmitter is commonly supposed to be due to the enormous strength of the direct ground signal as compared with the strength of the echoes. This is undoubtedly one reason; but there is another reason to which proper attention has not been paid by investigators in this field.
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References
Breit and Tuve, Phys. Rev., 27, 554; 1926.
Mitra and Rakshit, Phil. Mag., 15, 20; 1933.
Appleton and Naismith, Proc. Roy. Soc., A, 137, 36; 1932.
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MITRA, S., RAKSHIT, H. Recording Wireless Echoes at the Transmitting Station. Nature 131, 657 (1933). https://doi.org/10.1038/131657a0
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DOI: https://doi.org/10.1038/131657a0
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Recording Wireless Echoes at the Transmitting Station
Nature (1933)
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