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# format auto-updated on access: Mon 03-Dec-2018 10:03:30 +00:00 CREG Journal 104 (0-24) This issue has a cover date of December 2018 and was published on 3 December 2018. Front Cover (1) Radiolocation in the resurgence of Cabouy, France with a 1.3m loop and Brian Pease-designed Class-E 3496Hz beacon. Photo: . Contents (2) List of contents and masthead information. CREG Spring 2019 Field Meeting. Simple Enclosure is Waterproof to 400 Metres (3-6) describes a low-cost equipment housing for underwater use at depths of, potentially, up to 1000m although caving applications would normally be at a shallower depth of under 100m. Possible uses of this housing would be as part of a data-logger designed to monitor water depth (via a pressure sensor), as well as temperature, electrical conductivity and possibly turbidity and fluorescence. Introduction to Cave Radiolocation (7-8) Radiolocation, an application of LF, VLF or ULF through-the-earth radio, allows an underground station to be located from the surface. This is a valuable technique in cave surveying as explains. This article is #2 in our Fundamentals series. Cave Exploration with the Inkonova Hybrid Drone Family (9-11) , Founder and CTO of Inkonova AB, introduces the company's range of innovative hybrid drones which have freely-rotating retractable wheels. He describes how one model has been trialled in a lava tube in Tenerife. Wet & Dry (12) Ruggedisation, waterproofing & construction techniques. Electrical Safety by . The Hidden Earth Timetable Display – Part 3 (13-15) continues with his series of articles on using Raspberry Pi computer modules as the basis for a network of computers that can provide information displays. This article includes an example of how to run a web browser in 'kiosk mode' on the Raspberry Pi, and how the Raspberry Pi can report its id to the system's web server. Letters and Announcements (16) Caving Conferences, , Optical Flash Slave Update . Web Watch (16) delves into the Internet once more and comes up with some fascinating finds. Batteries, robots, 3D printing and more... We Hear (17) Roundup of news and events – brings us the latest to impact the world of cave radio and electronics. Panasonic Introduces De-stinking Technology, Sweat-powered Radio, Atomic Radio Receivers, Chemical Lighting. Carbon Dioxide Data Logging in Caves – Part 1 (18-19) In this first of two articles, considers a requirement to monitor CO2 levels in caves. He reviews available sensors, describes the development of a prototype logger using an SCD30 non-dispersive infrared sensor, and shows preliminary results. Radiolocation at Pen Park Hole (20) reviews a paper describing the use of radiolocation to help preserve a cave of significant scientific and historical interest. Bluetooth on a Budget (21-22) Bluetooth handsets and headsets for radios are restricted to specific models, limited in availability, and tend to be very expensive. Adapting low-cost off-the-shelf Bluetooth devices for incorporation into self-build projects can be a viable option. describes his experience with two such devices. CREG Field Meeting: October 2018 (23) Activities at our most recent field meeting were mostly related to communications. outlines the weekend's activities. The Adventures of GREG (24) Illustration by , words by .