Letter | Published:

Ghost echoes on the Earth–Moon path

Nature volume 257, page 36 (04 September 1975) | Download Citation

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Abstract

ON July 7, 1974 while using a Moon Bounce technique on 1,296 MHz I observed the appearance of strange, delayed echoes. My equipment consists of a parabolic antenna 26 feet in diameter with a circularly polarised feed horn driven with 500-W continuous wave from a transmitter. The receiver has a noise figure of 2 dB and a bandpass of 500 cycles and the equipment had a very distinct note because of a spurious frequency near the fundamental; on the Moon–Earth circuit it is very easy to identify this signal because of this unique characteristic. On the day in question a series of dots or a single dash were being reflected back from the Moon after 2.6 s. Suddenly there appeared a second signal delayed by approximately 2 s. This signal had the same characteristics of the Moon Bounce signal except that it was weaker.

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  1. Amateur Radio OZ9CR, Asum Odense Denmark

    • HANS LOHMANN RASMUSSEN

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DOI

https://doi.org/10.1038/257036a0

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