CREG Journal (ISSN 1361-4800)

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Contents of journal 19
March 1995

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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 6.1MB)        Individual articles may be available below

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

 

Reviews of Literature Received

David Gibson lists some papers which readers have sent in.

 

The Autumn '94 Field Meeting

Mike Bedford reports on the field meeting in Nidderdale.

 

The Use of VHF/UHF to Help in Locating Dig Points

Steve Laugher shows how VHF walkie-talkies can be used to locate digs from the surface.

 

Earth Current / Induction Field Experiments

Following David Gibson's assertion that an earth current signal could be received inductively, Rob Gill put it to the test obtaining encouraging results.

 

Collapsible VHF Yagis

Experiments at the field meeting used collapsible Yagis to attempt long distance communication along passages. Mike Bedford reports.

 

A Preliminary Underground Spectrum Survey

With a view to selecting ideal frequencies for new cave radios, John Rabson describes how he set the ball rolling at the field meeting.

 

Lithium-ion Cells

An overview of these new cells by David Gibson.

 

Experimenting with Capacitive Couplers for SWTs

Experiments with different designs of capacitive couplers for earth return telephones are described by Nigel Lovell.

 

Designing a Capacitive Coupler for an SWT

Some theoretical guidance by David Gibson.

 

Losses in Tuning Capacitors

David Gibson described the effect of dielectric losses in the tuning capacitors of loop antennas and indicates which types of capacitor have the lowest loss.

 

Experimental High-energy Flashgun

Chris Vernon describes his 90J flashgun and presents the circuit diagram.

 

Update - Type-approved Transmitter Module

Following some misunderstanding regarding articles in the last Journal, David Gibson clarifies his ideas for a type-approved transmitter module.

 

Headlite Performance Tests

Test results on Speleo Technics' new NiCd lamp, reported by Keith Lewis.

 

Cave Radio Notebook

In this new series, David Gibson presents notes on 1: aperture synthesis, 2: spectrum analysis, 3: digitised speech.

 

An Advanced Method of Soft Speech Clipping - part 2

Bill Purvis describes the algorithm used and the results obtained with an experimental method of digital speech processing.

 

Wet & Dry

Our regular(ish) column on waterproof electronics. David Gibson describes Pelican cases, Hexseals and waterproof speakers.

 

The Proximity Effect - part 1

David Gibson describes this little-discussed effect which was described by Butterworth in 1926.