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Contents of journal 24
June 1996
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CREG Journal Archive:
This issue is available on paper as part of a two-volume archive,
covering issues 1 to 25.
To purchase it, please visit
Lulu.com.
- CREG Journal
(PDF 6.5MB)
  Individual articles may be available below
- Contents. (This is a bit-map scan).
-
- Some Experiments in Speech Bandwidth Reduction
- John and Hugo Rabson describe their progress with speech bandwidth reduction in software.
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- The D-Q Beacon Receiver - Overview
- Brian Pease outlines the receiver for use with the radio-location beacon described in the last issue.
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- Caving Electronic Projects at University
- The CREG is keen for university students to work on cave radio projects. Chris Trayner looks at what's already been done and the way forward.
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- Emergency Caving Lamp Uses LEDs
- Mike Bedford presents a simple constructional project.
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- An Introduction to Data Transmission
- An introduction to data communications as applied to cave radio, by David Gibson.
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- Closed Circuit TV for Underground Use
- A circuit for transmitting video signals over cheap twisted pair cable is described by Nick Negus.
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- The Talking Machine of Lamb Leer Cavern
- Bob Williams describes the re-discovery of Lamb Leer Cavern in the 1880s. This includes the first recorded use of a telephone in cave exploration.
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- Cave Radio Notebook
- 10: skin depth, 11: speech band compression, 12: toroidal loop antennas, 13: the inverse cube law, 14: data communications.
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- An Optimal NiCd Charger
- Mike Bedford outlines an intelligent charger based on the principle of 'optimal charging'. A flow diagram is given.
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- Spectral Optimisation of a Loop Antenna Driver
- Derek Potter investigates whether it is possible to match the antenna tuning to the signal spectrum in order to maximise the output.
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- Electronics in Surveying, part 2
- David Gibson elaborates on his article in the previous Journal. Global positioning and inertial navigation are discussed.
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