Abstract
ON three occasions in April 1963, an interfering signal on 18 kc/s with a frequency deviation from nominal of 6 ± 1 parts in 107 and received at approximately the same signal strength as NBA (Panama Canal Zone) was observed at the Dominion Physical Laboratory, Lower Hutt, New Zealand. The times of occurrence to the nearest 5 min were: 
The beat frequency record for April 13, 1963, is reproduced in Fig. 1.
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References
Rohan, P., Anderson, L. L., and Cooke, D. J., Nature, 197, 783 (1963).
Allan, A. H., Nature, 198, 582 (1963).
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ALLAN, A. Interfering Radio Signals on 18 kc/s received in New Zealand. Nature 201, 1016–1017 (1964). https://doi.org/10.1038/2011016b0
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DOI: https://doi.org/10.1038/2011016b0
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