CREG Journal (ISSN 1361-4800)

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Contents of journal 104
December 2018

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CREG Journal 104 (0-24) (PDF 4.6MB)        Individual articles may be available below

This issue has a cover date of December 2018 and was published on 3 December 2018.

 

Front Cover (1) (PDF 1.1MB)     

Radiolocation in the resurgence of Cabouy, France with a 1.3m loop and Brian Pease-designed Class-E 3496Hz beacon. Photo: Niko Gerdau.

 

Contents (2) (PDF 567KB)     

List of contents and masthead information. CREG Spring 2019 Field Meeting.

 

Simple Enclosure is Waterproof to 400 Metres (3-6) (PDF 529KB)     

David Gibson 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) (PDF 508KB)     

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 Mike Bedford explains. This article is #2 in our Fundamentals series.

 

Cave Exploration with the Inkonova Hybrid Drone Family (9-11) (PDF 561KB)     

Pau Mallol, 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) (PDF 269KB)     

Ruggedisation, waterproofing & construction techniques. Electrical Safety by Tony Haigh.

 

The Hidden Earth Timetable Display – Part 3 (13-15) (PDF 282KB)     

David Gibson 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) (PDF 273KB)     

Caving Conferences, Peter Cousins, Optical Flash Slave Update David Gibson.

 

Web Watch (16)  For download see previous item

Peter Ludwig delves into the Internet once more and comes up with some fascinating finds. Batteries, robots, 3D printing and more...

 

We Hear (17) (PDF 269KB)     

Roundup of news and events – Mike Bedford 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) (PDF 509KB)     

In this first of two articles, Bob Mehew 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) (PDF 261KB)     

Mike Bedford 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) (PDF 641KB)     

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. Tony Haigh describes his experience with two such devices.

 

CREG Field Meeting: October 2018 (23) (PDF 250KB)     

Activities at our most recent field meeting were mostly related to communications. Robin Gape outlines the weekend's activities.

 

The Adventures of GREG (24) (PDF 893KB)     

Illustration by Adrian Higgins, words by Mike Bedford.