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# htmlentities() run on access: Sat 01-Sep-2018 11:05:28 +01:00. Delete this line to re-run it. # format auto-updated on access: Sat 01-Sep-2018 11:05:28 +01:00 CREG Journal 103 (0-24) This issue has a cover date of September 2018 and was published on 1 September 2018. Front Cover (1) Slow Scan TV over cave radio at the recent CREG Field Meeting. Using Android apps and Peter Eggleston's interfaces to µHeyPhones. Photo: . Contents (2) List of contents and masthead information. CREG Field Meeting 27-28th October, Hidden Earth. Simple SSTV for Cave-to-Surface Image Transfer (3-4) 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) 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) Ruggedisation, waterproofing & construction techniques. A review of circuit power protection measures by . Thermal Imaging – a 2018 Perspective on IR Camera Advances (9-11) In this first of two articles, 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) 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) General purpose LED lamps are now reasonably bright, affordable and tough enough for use underground. investigates their use as an alternative to flash for underground photography. Web Watch (14) A further tranche of fascinating links from the Internet presented for our consideration by . Mountain and Cave Rescue Radio Systems 'Go Digital' (15-16) VHF frequency migration and the availability of DMR technology means big changes for mountain and cave rescue organisations. explains. We Hear (17) Roundup of news and events – 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) Geophysical methods of cave detection have, to date, reaped few positive results in finding new caves. As and 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) 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, describes how to get started with the Raspberry Pi. A future article will give actual code examples. The Adventures of GREG (24) Illustration by , words by .