Theory and Design of Resonant Transformer-Coupled Loop-Antenna Input Systems for VLF Reception,
NAVAL RESEARCH LAB WASHINGTON DC
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Investigations of effective small collectors for very low. frequency radio energy indicate that direct coupled loop circuits provide maximum possible signal to noise ratio for given Q value. It is recommended that these antennas be used where no appreciable length of cable is needed between loop and tuning condenser, and where tuning coverage is limited to one band.
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