Abstract
IT has been reported1 that long-delay multipath effects were observed when pulsed transmissions on 37 Mc./s. from Gibraltar were received in the United Kingdom during very high frequency forward-scatter propagation measurements. Delayed signals at multiples of approximately 20 msec. up to 80 msec. and traces of later components with about 130 msec. delay were detected. It was suggested that these were caused by a combination of reflexions at the F2 region and ground back-scatter behind the transmitting aerial, but the possibility of round-the-world propagation was discounted. The earlier delayed echoes were most probably due to the mechanism suggested, but observations at the Radio Research Station have shown that the signal with the longest delay was more likely to be due to round-the-world propagation.
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References
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Humby, A. M., Minnis, C. M., and Hitchcock, R. J., Proc. Inst. Elect. Eng., 102, B, No. 4, 513 (1955).
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LUSCOMBE, G. Delayed Signals in Ionospheric Forward-scatter Communication. Nature 180, 138 (1957). https://doi.org/10.1038/180138a0
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DOI: https://doi.org/10.1038/180138a0
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