CREG Journal (ISSN 1361-4800)

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Contents of journal 132
December 2025

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CREG Journal 132 (0-24) (PDF 13.5MB)        Individual articles may be available below

This issue has a cover date of December 2025 and was published on 1 December 2025.

 

Front Cover (1) (PDF 483KB)     

Dr Matt Rowberry installing a novel positioning system for three dimensional fracture displacement monitoring in the British Cave Science Centre. Photo: John Gunn

 

Contents (2) (PDF 203KB)     

List of contents and masthead information.

 

News and Notes (2)  For download see previous item

Spring 2026 Field Meeting, Hidden Earth 2026, CREG Editorial Team.

 

A Practical Guide to 3D Cave Photography (3-6) (PDF 1.5MB)     

Cave passages provide a wonderful if harsh environment for stereo photography. Here, Michael Perryman provides a simple 'how to' guide, aimed at allowing complete beginners to take their first steps in capturing three-dimensional images.

 

Detection of Unknown Cavities in Caves Using Infrasound (7-8) (PDF 591KB)     

Rafael Grimm describes a new innovative method for the detection of unknown cavities in caves using infrasound.

 

Stations Transmitting in the VLF Spectrum (9) (PDF 24KB)     

Knowing about those radio stations transmitting in the frequency bands used for caving-related applications can be essential. Mike Bedford investigates one such band, namely VLF.

 

Pinger 2.0: an Updated Transmitter for Radiolocation in Flooded Passages, Part 2 (10-14) (PDF 7.7MB)     

To conclude their discussion of this new radiolocation transmitter, Aren Leishman and Ken Smith turn their attention to constructional details and guidance on how to use the system.

 

Micro-HeyPhone Modification (14) (PDF 284KB)     

Chris Ross describes a Micro-HeyPhone modification to prevent feedback that can occur in some circumstances.

 

The British Cave Science Centre - an Update (15-16) (PDF 228KB)     

Established to provide an open-access research facility for scientists and engineers, the British Cave Science Centre is now seven years old. Here, Andrew C. Smith and John Gunn provide a reminder of the aims and ambitions of the BCSC, outline some recent developments, and stress the ongoing opportunity for technically minded cavers to make a valuable contribution.

 

Hidden Earth 2025 (17) (PDF 186KB)     

Chris Ross provides an overview of the UK's Hidden Earth caving conference, paying particular attention to the technology-related activities.

 

Building Blocks (18) (PDF 1.2MB)     

The humble relay, old technology, but still going strong! by Tony Haigh.

 

Tuned Loop Antenna Matching Made Easy (19-21) (PDF 1020KB)     

Brian Pease describes a simpler alternative to commonly used methods to match low-frequency tuned loop antennas to radios by adding a single capacitor to the tuned loop circuit. Easy equations are given along with methods to measure loop impedance without an impedance meter.

 

Update (21) (PDF 978KB)     

The Technology of Cave Diving Habitats, Andy Pitkin, CREGJ 131, pp. 3-7.

 

Book Review - Cave Radio (22) (PDF 282KB)     

The Radio Society of Great Britain, the UK's amateur radio organisation, has recently published an introductory book on Cave Radio, written by Mike Bedford. Rob Gill takes a look and considers whether this will encourage wider interest in cave radio and electronics.

 

CREG Field Meeting - Autumn 2025 (23-24) (PDF 394KB)     

CREG recently held a very successful field meeting in the Yorkshire Dales as Mike Bedford reports.