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Contents of journal 29 September 1997
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- CREG Journal
(PDF 10.5MB) Individual articles may be available below
- Contents
-
- Light Work - An Overview of Sight, Seeing, Light & Lighting
- How does the human eye respond to various forms of lighting? Steve Clark investigates, and suggests a bright future for the new breed of high-brightness white LEDs.
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- Foot-Candles: Photometric Units
- More footnotes on optical topics by David Gibson.
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- Fluorescent Tube Drivers
- A selection of references to circuits for driving fluorescent tubes collected by David Gibson.
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- State of the Art Main Caving Lamps
- Peter Lugwig presents his views on the ideal main caving lamp and investigates how this may be provided by new light sources and batteries.
-
- Update: Flashgun Slave
- This short note gives an update on the constructional information for David Gibson's slave unit.
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- Using LEDs as Photodiodes
- David Gibson shows that using an LED could reduce the cost, and increase sensitivity of his flashgun slave.
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- The Cave Radio & Electronics Group - The First 10 Years
- Mike Bedford and David Gibson chart our progress over the first ten years.
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- LF Spectrum Surveys - a Review
- John Rabson reviews the work carried out so far makes some preliminary proposals on suitable frequencies for designers of new cave radios.
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- Batteries at Low Temperatures
- John Rabson cools some batteries.
-
- Cave Radio Notebook
- Deforming Loop Antennas & Racal-Decca Beacons.
-
- The Future of Amateur LF Bands
- The 73kHz amateur band may soon be joined by one at 136kHz. Chris Trayner reports.
-
- Web Watch
- The Web is becoming an indispensable source of information for the electronically-minded caver. Peter Ludwig of Austria reviews some lighting-related sites.
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- Literature Received
- Review of John Taylor's paper on earth current communication by Mike Bedford.
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- A Two-tone Generator for Aligning SSB Transmitters
- John Hey presents a practical design for a portable unit which is suitable for use with cave radios.
-
- Spectrum
- News about the LF spectrum by David Gibson.
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- The Resistance of Ground-electrode Arrays
- Using N electrodes in a ground array can reduce the resistance to 1/N but certain criteria have to be met. David Gibson explains the theory.
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- Electronics Underground in Yorkshire and Mendip
- Richard Rushton reports on our latest two field meetings.
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- Earth Current: Directionality & Circular Polarisation
- John Hey and Rob Gill describe experiments to evaluate the benefits of 'circularly polarised' earth current transmission and to measure the relationship between field strength, distance and orientation.
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- Letters to the Editor
- Feedback, debate, information & news - our readers have their say.
-
- The New CREG Journal Bar Code
- David Gibson.
-
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