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contents of j29
September 1997
- 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.
- Foot-Candles: Photometric Units
- More footnotes on optical topics by David Gibson.
- Fluorescent Tube Drivers
- A selection of references to circuits for driving fluorescent tubes collected by David Gibson.
- 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.
- Using LEDs as Photodiodes
- David Gibson shows that using an LED could reduce the cost, and increase sensitivity of his flashgun slave.
- The Cave Radio & Electronics Group - The First 10 Years
- Mike Bedford and David Gibson chart our progress over the first ten years.
- 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.
- 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.
- Literature Received
- Review of John Taylor's paper on earth current communication by Mike Bedford.
- 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.
- 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.
- Electronics Underground in Yorkshire and Mendip
- Richard Rushton reports on our latest two field meetings.
- 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.
- 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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The CREG journal (ISSN 1361-4800) is published quarterly by the Cave Radio & Electronics Group of the British Cave Research Association. BCRA is a UK registered charity and is a constituent body of the British Caving Association, undertaking charitable activities on behalf of the BCA. CREG's aims are, by means of a regular Journal, other publications and meetings, to encourage the development and use of radio communications and other electronic and computer equipment in caving and related activities.
Annual Subscriptions are currently £8.50 (UK). The overseas rates are £10 (EU), £10 (World, surface mail) and £12.50 (World Airmail). Most back issues are still in print. For details, please contact CREG.
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