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CREG Journal 94 (0-24)
This issue has a cover date of June 2016 and was published on 14 June 2016.
Front Cover (1)
Roo Walters laser scanning in Gaping Gill. Photo: Chris Howes.
Contents (2)
List of contents and masthead information.
Radio Propagation in Standedge Tunnel (3-5)
Back in 2003, CREG was invited by Network Rail to investigate radio propagation in Standedge tunnel. During these tests, some unexpected results were obtained. Various hypotheses were discussed, but the work was never followed up. David Gibson asserts that a lack of 'experimenter's diligence' in the original work prevents us from drawing any useful conclusions, and he warns of the danger of making a 'wishful' hypothesis.
Laser Scanning the World's Largest Cave Chambers (6-10)
Richard Walters (Roo) is part of a team that aims to survey the World's largest chambers in full 3D using laser scanning techniques. Here he presents the results to date and a practical guide on how to conduct a laser scanning exercise.
John Hey – an Appreciation (11-12)
John Hey will be greatly missed. His contributions to cave radio are well known, but his wide range of other interests may surprise some. These brief tributes, from a number of past and present members of CREG, highlight his quiet and independent character, many talents and numerous pastimes.
802.11af & 802.11ah: Examining the Next Generation of Wi-Fi (13-14)
Mike Bedford delves into several new wireless networking standards, emphasising those which have something to offer the technically-minded caver.
We Hear... (15-16)
News and events – Mike Bedford brings us the latest to impact the world of cave radio and electronics. MEMS-based Gravimeter, Cheap Disto Clone, Introducing UNEXMiN, Faster Landmine Detection, Photography Lamp, Stretchy PCBs.
Wet & Dry (16)
Ruggedisation, waterproofing & constructional techniques – a roundup by Mike Bedford. Clever Wire Stripper, Solder-less Connections, Seriously Rugged Smartphone.
Electric Fields around an Underground, Radiating Electric Dipole (17-19)
Ian Drummond revisits Nevin Davis's 1970 paper 'Optimum Frequencies for Underground Radio Communication'. Research had been carried out on communication between underground sites as part of Cold War preparations. Davis was able to make use of this work to explore how it might be of benefit to cave communications. Davis's conclusions remain relevant today.
Letters and Notes (19)
Calling Elderly Radio Amateurs [The author describes the concept of a "Naive Hoax"] , Diary Dates.
Web Watch (19)
Peter Ludwig offers more Internet gems...
Introducing Sonar Technology as a Tool for Underwater Cave Surveying (20-23)
Christian Dobson, Applications Engineer, Tritech International Ltd., describes the technology of acoustic sensors, the fast update and real-time imaging and profiling options for sonar, and how the technology could benefit cave diving.
Searching the CREG Journal Contents Lists (24)
David Gibson describes a search routine that he is developing for the CREG Journal database.
The Adventures of GREG (24)
Illustrations by Adrian Higgins with words by Mike Bedford.