CREG Journal (ISSN 1361-4800)

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Contents of journal 103
September 2018

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CREG Journal 103 (0-24) (PDF 5.5MB)        Individual articles may be available below

This issue has a cover date of September 2018 and was published on 1 September 2018.

 

Front Cover (1) (PDF 1.6MB)     

Slow Scan TV over cave radio at the recent CREG Field Meeting. Using Android apps and Peter Eggleston's interfaces to µHeyPhones. Photo: Mike Bedford.

 

Contents (2) (PDF 240KB)     

List of contents and masthead information. CREG Field Meeting 27-28th October, Hidden Earth.

 

Simple SSTV for Cave-to-Surface Image Transfer (3-4) (PDF 429KB)     

Peter Eggleston describes how smartphone apps allow slow scan television pictures to be exchanged between cave and surface without the bulky or expensive equipment that was previously required. Good results are reported.

 

Introducing the SubPhone: an SDR-based Cave Radio (5-7) (PDF 1.6MB)     

Ron Taylor provides an overview of a new software defined cave radio which uses an off-the-shelf DSP board. The top-level design is presented, as are the results of initial tests by the Matienzo expedition team members.

 

Wet & Dry (8) (PDF 240KB)     

Ruggedisation, waterproofing & construction techniques. A review of circuit power protection measures by Tony Haigh.

 

Thermal Imaging – a 2018 Perspective on IR Camera Advances (9-11) (PDF 476KB)     

In this first of two articles, John T M Lyles reviews developments in the field of thermal imaging technology over the last ten years. Much has changed in terms of capability and price, making the technology more practical for a number of cave science applications.

 

Micro HeyPhone: Update to V3 (12) (PDF 278KB)     

Ian Cooper details an update to the Micro HeyPhone transmitter caused by the unexpected obsolescence of the device used as the power amplifier. He also updates the previously published bill of materials and discusses AGC enhancements.

 

Off-the-Shelf LED Lamps for Cave Photography (13-14) (PDF 418KB)     

General purpose LED lamps are now reasonably bright, affordable and tough enough for use underground. Mike Bedford investigates their use as an alternative to flash for underground photography.

 

Web Watch (14) (PDF 335KB)     

A further tranche of fascinating links from the Internet presented for our consideration by Peter Ludwig.

 

Mountain and Cave Rescue Radio Systems 'Go Digital' (15-16) (PDF 402KB)     

VHF frequency migration and the availability of DMR technology means big changes for mountain and cave rescue organisations. Tony Haigh explains.

 

We Hear (17) (PDF 425KB)     

Roundup of news and events – Mike Bedford brings us the latest to impact the world of cave radio and electronics. Artificial Intelligence Meets 3D Photography, DARPA Sends Robots Underground, Amateurs ask "How Low Can We Go?".

 

Practical Geophysical Methods of Cave Detection (18-21) (PDF 818KB)     

Geophysical methods of cave detection have, to date, reaped few positive results in finding new caves. As Atanas Rusev and Tanya Slavova report, however, this isn't inevitable. Here they describe cave detection, using ground-penetrating radar, magnetometry, gravimetry and infrared imaging, and illustrate the techniques with case studies showing the discovery of new caves and entrances.

 

The Hidden Earth Timetable Display – Part 2 (22-24) (PDF 466KB)     

The UK's annual caving conference – Hidden Earth – has experimented with a network of computers that provide timetable displays, as well as news and information. The Raspberry Pi module makes a very useful web client for such a system. In this article, David Gibson describes how to get started with the Raspberry Pi. A future article will give actual code examples.

 

The Adventures of GREG (24) (PDF 379KB)     

Illustration by Adrian Higgins, words by Mike Bedford.