sandbox: Journal 136 has gone to press and is due for publication in December 2026
CREG Journal 136 (0-24)
This issue has a cover date of December 2026 and was published on 1 December 2026.

Front Cover (1)
Stuart de Haas demonstrates the CTX Radio system to the expedition team while waiting for a helicopter to take them to Bisaro Anima Cave, Fernie, BC, Canada. Photo: <span class="author">Katie Graham</span>

Contents (2)
List of contents and masthead information.

News and Notes (2)
CREGJ Editor, Style Guide and Submissions Guidelines, Future CREG Field Meetings, Hidden Earth 2027.

PIXIE: A Low-cost Open-source In situ Fluorometer - Part 2 (3-6)
Following his introduction to the PIXIE open-source, low-cost, in situ, submersible fluorometer project, <span class="author">David Eason</span> provides practical information for potential users. Included here are details on building the unit, adding a data logger, plus calibration and testing. He also addresses the lessons learned.

Real-time Data Analysis from Cave Sensors - Part 2 (7-10)
<span class="author">Luca Tringali</span>, <span class="author">Alexander Debenjak</span>, <span class="author">Tecla Tripari</span>, <span class="author">Caterina Bearzotti</span> and <span class="author">Giacomo Canciani</span>, of Gruppo Speleologico Talpe del Carso - J.K. Kra&scaron;ki Krti, continue their discussion of the data storage and analysis tools that have been adopted for their open-source real-time cave dataloggers with telemetry. Other SQL queries are covered, specifically graph plotting, standard deviation and error, linear regression, correlation and generating alerts.

Low-Earth Orbit Satellite Services for Mountain Rescue (11-12)
Low-Earth Orbit Satellites can offer a cost-effective solution for rescue teams. <span class="author">Tony Haigh</span> provides an introduction to StarLink, with some reference to alternative services.

Maximising Single-hop Range with Meshtastic-based Along-passage Radios (13-15)
<span class="author">Mike Bedford</span> investigates how the range of Meshtastic-based radios can legally be increased, thereby minimising the number of nodes required to achieve a particular overall range.

CTX&colon; A Ruggedized Digital Cave Radio System (16-18)
The CTX is the newly developed Canadian Through-the-Earth Transceiver. Here, <span class="author">Stuart de Haas</span> introduces this digital cave radio system, describes use in the field, and discusses plans for further development.

The Cave-Link System in Practice&colon; Field Use Tips for Underground Communication and Radiolocation. (19-22)
The Cave-Link system, derived from ground-based transmission devices, enables the establishment of two-way surface-cave radio links and supports communication during radiolocation operations. <span class="author">Daniel Chailloux</span> offers a set of practical tips for optimising its use in the field: the installation of earthing plates, establishing and maintaining the surface-cave link, integration with conventional radiolocation methods, and operational organisation.

CREG Field Meeting Report&colon; October 2026 (23-24)
The Autumn field meeting included demonstrations, trials and technical discussions. <span class="author">Rob Gill</span> summarises the recent two-day event, held in the Yorkshire Dales.