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CREG Journal
Contents

Introducing the Nicola System
When complete, the Nicola System will provide an early warning system and communication for rescue use in the Gouffre Berger. Graham Naylor outlines the system and describes progress to date.

Speleonics
Recent topics included using salt to lower earth resistance, and the mechanism of magnetic field generation in earth-current systems. Review by David Gibson.

From Alkaline to Zinc Air - an A to Z of Batteries
Not long ago battery choice was limited but today the choices are bewildering. Mike Bedford considers the options for lighting and for radio & electronics equipment.

The Berger on 137kHz
Jean-Jacques Fauchez discusses his first underground tests on the 137kHz amateur band.

EMC Type Examination for RF modules
In addition to Type Approval, transmitters require EMC Type Examination. The RA has recently clarified these procedures for RF modules. David Gibson reports.

Sumpflash 2
In 1996, Underground Photographer described a Sumpflash built in a jam jar. Just when you thought it was safe to go back in the water, here is another design. Chris Trayner describes an adaptation of a flashgun, with slave unit, which can be used underwater.

Another Year Over - Secretary's Report for 1997/98
Richard Rushton, CREG's retiring secretary, takes a look over CREG's achievements over the last twelve months.

Web Watch
Peter Ludwig provides a selection of Web sites which have featured on the Speleonics mailing list.

Making Mic Speak
How to re-wire a microphone to act as a speaker / microphone by John Hey.

Cave Radio Notebook
33: Winding an Earth-current Transformer. 34: Ground Proximity & Antenna De-tuning. 35: Deep Radio-location.

CREG Equipment Loan Scheme
Who says CREG only ever talks about cave radio? Jeremy Davis introduces our equipment loan scheme as a service to the caving community at large.

Wet & Dry
Durable Labels, protecting switches against shock, ruggedness tests and more on Rugged Laptop Computers are this quarter's topics. Edited by Richard Rushton.

Going Deeper - two ways to Improve Performance
Ian Drummond and Bill Putnam experiment try a couple of techniques to improve range with LF cave radios. The results are impressive.

John Hey in the Spotlight
John Hey is the RSGB's LF Experimenter of the Year - news report by John and Rosy Rabson.

If you had a Hammer ... Electrokinetic Water Detection
If you're looking for water or oil (or a cave?), try giving the ground a good thump says Agathe Remousé.

UHF TX & Rx Modules: An Introduction
Mike Bedford considers the options for remote control underground and outlines one solution - UHF modules.

Letters to the Editor
Feedback, debate, information & news - our readers have their say.