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# format auto-updated on access: Mon 27-Nov-2017 11:30:02 +01:00 CREG Journal Contents. (This is a bit-map scan). Phased-array Sonar for Rangefinding David Gibson presents a computer-generated plot showing how the beam from a small ultrasonic transducer might be concentrated. (Front cover diagram). UK VLF Licence Regulations David Gibson summarises the MPT 1337 type-approval specification. Optimal Design of a Cave Radio David Gibson summarises some key points. Lighting: The Aven Explorer Small NiCd cells can be used with high wattage bulbs provided certain precautions are taken. David Gibson explains. Cave Detection with rho, sigma, mu, epsilon. Part 1 David Gibson summarises the physical parameters that we could consider measuring in order to detect caves. Are Q-Multipliers Any Use for Cave Radio David Gibson questions the worth of the Q-multiplier, seen in several designs of cave radio receiver.