CREG Journal (ISSN 1361-4800)

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Contents of journal 41
September 2000

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CREG Journal (PDF 7.4MB)        Individual articles may be available below

Contents

 

Introducing a New Cave Radio for Rescue Use

Mike Bedford provides background information on the new cave radio which is about to be issued to the UK's rescue teams.

 

A New Rescue Radio - the Electronic Design

The British Cave Rescue Council (BCRC) is about to issue new cave radios to the UK's rescue teams. Electronic designer John Hey provides details of the circuit and the PCBs.

 

The Cave Radio Road Show

Pete Allwright has been conducting field tests of the new BCRC rescue radio with the UK's rescue teams. Here he collates the results to date.

 

Speleonics

Optimum frequency for cave radios, and hot & cold cathode lamps are among the subjects discussed over the last six months. Jeremy Davis reviews the postings.

 

Measuring L, C, Q & Resonance

Jean-Jacques Fauchez describes a practical method for measuring L, C, Q & resonance. Translation by John Rabson.

 

Tough Stuff - Investigating Rugged & Waterproof Equipment

Mike Bedford takes a look at some of the ruggedised electronic equipment which is available on the general market.

 

Wet & Dry

A specification for 'cave-qualified' electronic equipment would be an aid to designers and builders. Richard Rushton summarises some discussions.

 

Web Watch

David Gibson explains how to avoid web-site-published e-mail addresses giving rise to junk e-mail.

 

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.

 

Raynet: A Resource for Rescue Teams

Raynet is the Radio Amateurs' Emergency Network. Chris Trayner describes what Raynet can offer and how this might be of value to cave rescue teams.

 

The Millennium Photo Meet

Richard Rushton describes events at our field meeting, dedicated to cave photography and video, which took place in June.

 

A Channel Sounder for Sub-Surface Communications Part 2 - Computer Simulation of a Small Buried Loop

Channel-sounders are used to test radio-wave propagation in a specified band, often the short-wave (HF) or one of the UHF cell-phone bands. In this series of articles, David Gibson describes a new design of sounder that operates from 0 - 200kHz with a wide-band induction loop antenna. The sounder can also be used as a spectrum analyser, and is intended to be part of a wideband adaptive digital communications system.

 

Letters to the Editor

Subjects include: Ultrasonic Microphones, DSP Analysis of Bat Calls, Antennas (plural) - Official!, 28MHz Rigs & Ian Drummond's Transverter, a LORAN Filter?, PSK31, 73kHz Amateur Allocation.