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# format auto-updated on access: Mon 02-Mar-2026 17:45:57 +00:00 #sandbox: Journal 133 has gone to press and is due for publication in March 2026 CREG Journal 133 (0-24) This issue has a cover date of March 2026 and was published on 2 March 2026. Front Cover (1) Stuart France installing his latest incarnation of the telemetry box in Dan-yr-Ogof cave in South Wales. Photo: Contents (2) List of contents and masthead information. News and Notes (2) Spring 2026 Field Meeting, Hidden Earth 2026, CREG Editorial Team. Introducing the Nicola 4 Rescue Radio (3-4) The latest member of the Nicola family of cave radios has recently been released. Developers and provide an overview. Are Cave Radio Loop Antennas Staging a Comeback? (5-8) 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. considers what benefits loop antennas could offer today. Also see the appendix listed immediatrely below. Formally Comparing Loop and Line Antennas (A1-A2) This appendix to CREG journal 133 is a more detailed version of the box-out on page 8 of this issue. It will be placed online by the middle of March 2026. Please contact us if you would like further information. We Hear (9) 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) As a prelude to providing constructional details in a future article, and provide an overview of the companion receiver to their Pinger 2.0 radiolocation transmitter for use in flooded passages. Correction (14) Pinger 2.0: an Updated Transmitter for Radiolocation in Flooded Passages, Part 1, and , CREGJ 131, pp. 8-10. PCB Production (15-16) 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, 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) Previously, 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) Students at the University of Nottingham have undertaken cave radio-related projects. Here, provides a summary of what they achieved. Student Projects (23) suggests that cave electronics-based projects for university students would be beneficial to the caving community. Historical Stereo Cave Photography (24) 3D cave photography has a long heritage as reports.