CREG Journal (ISSN 1361-4800)

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Contents of journal 133
March 2026

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sandbox: Journal 133 has gone to press and is due for publication in March 2026

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CREG Journal 133 (0-24) (PDF 23.2MB)        Individual articles may be available below

This issue has a cover date of March 2026 and was published on 1 March 2026.

 

Front Cover (1) (PDF 920KB)     

Stuart France installing his latest incarnation of the telemetry box in Dan-yr-Ogof cave in South Wales. Photo: Martyn Farr

 

Contents (2) (PDF 1.5MB)     

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.

 

Introducing the Nicola 4 Rescue Radio (3-4) (PDF 1.2MB)     

The latest member of the Nicola family of cave radios has recently been released. Developers Graham Naylor and Pete Allwright provide an overview.

 

Are Cave Radio Loop Antennas Staging a Comeback? (5-8) (PDF 4.9MB)     

In many geographical regions, earth arrays are now used almost universally with through-the-earth cave radios. This is in marked contrast to the early days when loop antennas were invariably used. However, there are indications that there's been a resurgence of interest in loops. Mike Bedford considers what benefits loop antennas could offer today.

 

We Hear (9) (PDF 1.1MB)     

Mike Bedford reports: iPhone Cave Lidar goes Mainstream, Low-cost Protection for in-Cave Drones, Quantum Physics to Offer an Alternative to GPS?

 

Pinger 2.0: A New Radiolocation Receiver, Part 1 (10-14) (PDF 5.0MB)     

As a prelude to providing constructional details in a future article, Ken Smith and Aren Leishman provide an overview of the companion receiver to their Pinger 2.0 radiolocation transmitter for use in flooded passages.

 

Correction (14) (PDF 3.6MB)     

Pinger 2.0: an Updated Transmitter for Radiolocation in Flooded Passages, Part 1, Aren Leishman and Ken Smith, CREGJ 131, pp. 8-10.

 

PCB Production (15-16) (PDF 1.3MB)     

Affordable PCB production, end-to-end assembly services (PCBA), and large component libraries have made it easier than ever to get high-density surface-mount boards produced for your projects. Using the radiolocation Pinger as an example, Aren Leishman explains how you can use these services yourself in your own KiCAD projects. This article is #11 in our Fundamentals series.

 

Dan-yr-Ogof Telemetry - Experience and Lessons (17-19) (PDF 3.9MB)     

Previously, Stuart France reviewed a year's progress with his cave water depth and local rainfall data acquisition system and, later, the upgrades made as a result of incidents during the first winter. This concluding article reports that the system is now reasonably reliable, supplying near-live online data on a single clear webpage to cavers about underground cave river conditions that they should expect to encounter.

 

Overview of University of Nottingham MEng Cave Radio Projects (20-23) (PDF 2.5MB)     

Students at the University of Nottingham have undertaken cave radio-related projects. Here, Tony Haigh provides a summary of what they achieved.

 

Student Projects (23) (PDF 1.0MB)     

Mike Bedford suggests that cave electronics-based projects for university students would be beneficial to the caving community.

 

Historical Stereo Cave Photography (24) (PDF 1.2MB)     

3D cave photography has a long heritage as Mike Bedford reports.