CREG Journal (ISSN 1361-4800)

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Contents of journal 42
December 2000

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CREG Journal (PDF 10.7MB)        Individual articles may be available below

Contents

 

Highest & Deepest 2000

In August 2000, teams ascended Mont Blanc and descended the Gouffre Berger and established radio and SSTV communication. Graham Naylor tells the story of this most unusual expedition.

 

Computer Simulation of a Grounded Wire Antenna

The equations that describe the sub-surface fields due to a wire laid on the surface are complicated, both to define and solve. Reno Lippold explains his implementation of Hill & Wait's equations using the MathCad package. In a commentary, David Gibson suggests how we might interpret these results.

 

Simple Flashbulb Firer

Flashbulbs are still the professionals' choice for cave photography. This simple circuit by David Gibson allows you to fire flashbulbs manually or with a slave unit.

 

A Prototype DSP- based Bat Detector

Keith Jackson and Rachel Roberts of the School of Electrical, Communication and Electronic Engineering, University of Plymouth, describe a prototype multi-mode bat detector which was produced as a project for Rachel's degree course. Limited success is reported and suggestions are made for further development.

 

Speleonics

A regular favourite subject over past years has been the use and design of an electronic rappel? control system. Review by Jeremy Davis.

 

Miniature Dichroic Lamps

Low voltage tungsten halogen bulbs in a dichroic 35mm envelope are now becoming available. David Gibson reports.

 

A Field Strength Measuring Receiver for LF and HF

Jean-Jacques Fauchez presents a special-purpose receiver design. Based on notes translated and amplified by John and Rosy Rabson.

 

Web Watch

Peter Ludwig.

 

Further Reading

If a topic in this issue interests you, this 'further reading' list from CREG journals, compiled by David Gibson, may be of use.

 

Wet & Dry

Standard connectors for caving and other caving-related electronics products are discussed. Edited by Richard Rushton.

 

Chairman's & Treasurer's Reports for 1999/2000

Officers' Reports from our recent AGM are reproduced.

 

The Future is not Orange,... but White

David Gibson and Stuart France describe the use of white LEDs for caving lamps and attempt to demolish a few myths. This article is the first of a series that will include practical circuits for LED caving lamps.

 

Should we Hang up our Soldering Irons Now?

Graham Naylor considers the future trends in analogue electronics and suggest that, in the not too distant future, cave radio developers will buy off-the-shelf hardware and develop the required functionality in software alone.

 

Update on Flood Pulse Logger

Preliminary results of Stuart France's PIC-based flood pulse logging.

 

Letters to the Editor

Feedback, debate, information & news - our readers have their say.