CREG Journal (ISSN 1361-4800)

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Contents of journal 25
September 1996

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CREG Journal Archive:
This issue is available on paper as part of a two-volume archive, covering issues 1 to 25. To purchase it, please visit Lulu.com.

CREG Journal (PDF 8.9MB)        Individual articles may be available below

Contents. (This is a bit-map scan).

 

Watching & Listening to the LF Bands

Ian Drummond introduces some software for analysing a receiver's audio output.

 

Alpine Cave Radio - Earth-current at Hölloch

Jacques Hurni, HB9OD and Christian Ebi, HB9ZGB of the Hölloch Cave Research Association AGH, outline cave radio development in Switzerland.

 

Humidity Measurement

Accurate humidity measurement in caves is not possible nor, says David Gibson, is it needed.

 

An Opportunity for Radio Amateurs

Robin Gape investigates the new UK amateur allocation at 73kHz.

 

Measuring Radiated Power at 73kHz LF

David Gibson explains how cave radio experimenters can benefit from the very strong near fields that 1W e.r.p allows, and explains the problems in measuring the radiated power.

 

Red or Green? LEDs on Test

Richard Rushton describes the results of an experiment to determine which colour of high-brightness LEDs are best as emergency lights.

 

3-D Vector Processing of Magnetometer and Inclinometer Data

Electronic sensors can be used to construct a cave surveying tool, but the data needs processing in 3 dimensions. David Gibson explains the maths.

 

Counting Cavers

Stuart France discusses the need to count cavers and outlines electronic developments in this area.

 

A Capacitive Coupler for SWTs

Mike Bedford provides constructional details for a capacitive coupler for SWTs.

 

Cave Radio Trials in the French Alps

In our second contribution from mainland Europe, Jean Jacques Fauchez, F6IDE, outlines his experiments with cave radio on various frequencies.

 

The Eartalker

David Gibson briefly describes a combined earphone / microphone.

 

Introduction to Solid-state Lithium-ion Cells

A cell which has double the power to weight ratio of NiCd or NiMH and can be moulded to any shape sounds too good to be true. Mike Bedford investigates.

 

Metal Halide Bulbs - Lighting for Tomorrow?

New to the cycling world is the CatEye Stadium lamp, which uses a metal halide bulb and offers unprecedented power per Watt. Possible caving applications are evident. Marty Goodman looks at how the metal halide bulb compares to other forms of electric lighting.

 

Safety-Critical Use of the Induction Radio Band

David Gibson reports on the latest proposals from the Radiocommunications Agency.

 

Underground Photographer

A review of issue 2 by Mike Bedford.

 

Letters to the Editor

UIS97, A Plea for Help from Ireland, Compliment from Belgium, Radio Location in Archaeology, Amateur LF Allocation, Time-domain Reflectometry, Radio-location Depth Measurement, High Brightness LED Safety, NCRC, Earth-Current Comms.