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AGO Lf Hf Comms Reciever Instructions Manual

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    Page 1 AGO Field Manual Dartmouth College LF-HF Receiver May 10, 1996
    Page 2 1 1 Introduction Many studies of radiowave propagation have been performed in the LF/MF/HF radio bands, but relatively few systematic surveys have been made of natural emissions in this part of the spectrum. The predominance of man-made signals in this frequency range requires a remote location and a radio receiver of specialized capabilities in order to search for natural emissions. For instance, a receiving system must be capable of both detecting very weak signals, and be able to step around or...
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    Page 4 3 3 Antenna and Preamplifier The AGO LF/MF/HF receiver employs a magnetic loop antenna which is less susceptible to locally generated noise than an electric dipole, especially when oriented to null out the strongest local signal. The loop consists of a single turn of wire arranged in a square between two vertical 12-foot-long 4 x4 posts placed 3 m apart. One horizontal wire runs along the snow, and the other connects the tops of the posts, so that the area of the loop antenna is 10 square meters....
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