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# format auto-updated on access: Sat 31-Aug-2024 19:25:28 +01:00

# sandbox: Journal 127 has gone to press and is due for publication in September 2024
CREG Journal 127 (0-24)
This issue has a cover date of September 2024 and was published on 1 September 2024.

Front Cover (1)
The SUNFISH AUV begins an exploration mission in Harasib Cave, Namibia. Photo: Jason Gulley

Contents (2)
List of contents and masthead information.

News and Notes (2)
Hidden Earth 2024 - UK's National Caving Conference.

How to Increase the Range of your 3D Laser Scanner (3-4)
Guy Van Rentergem outlines a novel method of surveying beyond the quoted range of a laser scanner. The technique involves using the scanner's intensity measurements, which work beyond the range of laser distance measurements, and employ photogrammetry.

Improvements for BuecherNet, a Low Power Data Network at Fort Stanton Cave, New Mexico, USA (5-7)
BuecherNet is a system for monitoring the water level 1.6km into Fort Stanton Cave. John T. M. Lyles and Ted Lappin describe the final system improvements and commissioning of the system.

Letters to the Editor (7)
Rob Gill Luc Le Blanc, Stuart France, Nicola 4 Update Pete Allwright.

Show Cave Lighting Systems (8-11)
Alexander Chrapko and Vladimir Vashkevich of Cave Lighting CL GmbH & Co. KG explain how lighting for show caves has changed significantly in recent years. This, in turn, has improved the visitor experience as well as providing environmental benefits.

LoRa and Meshtastic for Underground Communications (12-13, 20)
Paweł Krawczyk introduces the long-distance communication protocol LoRa and discusses its potential for mesh-based communication along cave passages. Also discussed is the opensource Meshtastic initiative, which adds data format and routing protocols for building ad hoc two-way communication networks.

Building Blocks (14)
Coaxial Cables, part 1, by Tony Haigh.

Underground Testing of a Loop Antenna for the Micro HeyPhone (15)
Previously, Chris Ross described how he'd designed a loop antenna for use with the Micro HeyPhone and presented the results of preliminary surface tests. Here, encouraging results are provided for a test between the surface and an underground station.

Autonomous Cave Exploration and Mapping with the SUNFISH Autonomous Underwater Vehicle (16-20)
Vickie Siegel, Kristof Richmond, Tyler Haden and Bill Stone, all of Sunfish, Inc., introduce an underwater robot that has been used in some of the world's most challenging flooded cave environments.

A Durable Small Sensor Boat for your Cave Projects (21-24)
Robotic cave exploration and research has commonly made use of airborne, submerged and ground-based vehicles. Here, though, Guy Van Rentergem describes how he has used a boat in a caving project, and provides a design that others can follow.