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The theory, construction, and use of high performance Cave Radiolocation equipmentis described in a series of articles originally published by the Cave Radio ...
3496 Hz  cave radio  D-Q Receiver  Thru-the-Earth 
radiolocation.tripod.com - 2009-04-10
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Information for Amateur Radio, Broadcast, Radiotelecommunication & Monitoring Stations.
MF radio 
www.dxinfocentre.com - 2009-02-09
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