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# format auto-updated on access: Tue 06-Jun-2023 18:01:32 +01:00 # sandbox: Journal 122 has gone to press and is due for publication in June 2023 CREG Journal 122 (0-24) This issue has a cover date of June 2023 and was published on 6 June 2023. Front Cover (1) Stef Williams, CEO of Aerialworx, flying a DJI Inspire2 drone during a photoshoot. Photo: Contents (2) List of contents and masthead information. News and Notes (2) Regular Columns, Articles for the Journal, Extending our Reach, . A Practical Guide to Underground Film Making Using a Drone (3-4) Drone use for in cave filming has grown substantially in recent years, but without some expert guidance, the results can be disappointing. , CEO of Aerialworx, provides her top tips for drone filming in caves. Comparative Review of MF and HF Frequencies for Cave Radio (5-8) Through-the-earth communication tests have been carried out in the Sima Aradelasis cave in Spain, on frequencies ranging from 1.8 MHz to 28 MHz in the MF and HF bands. Links were established on all frequencies. , EB1HBK, provides comparative results. Letters to the Editor (9) Phosphorescence, ; Skin, Proximity and Solenoid Effects, . An Improved Directional Draught Detector (10-12) Seeking to determine if a slight draught reversed when he and fellow diggers were not present, updated his earlier detector design to log direction and strength of draught. Building Blocks (13) Touch screen technologies and implementation – Part 1, by . Comparing Loop and Line Antennas for Cave Radio Applications – 1 (14-16) An induction-loop transmitter can operate at a higher current than a grounded electric dipole because the loop has a relatively low resistance when compared to the resistance between two earthed electrodes. However, the magnetic field from a loop falls off more rapidly with distance, so it is not straightforward to say that one antenna is better than the other. Several other factors, both physical and practical, come into play. In this article, outlines how we might go about making a comparison. This is a nonmathematical article – a more complete treatment will be given in part 2 of this article. We Hear (17) Roundup of news and events: brings us the latest to impact the world of cave radio and electronics. Radio Interference: a Thing of the Past?, Muon Tomography in the Great Pyramid of Gaza, AA Rechargeables get the USB-C Treatment. An Affordable Water Sampler (18-21) To meet a requirement for regular water samples, has developed a low-cost automatic sampler. This design is fully programable and able to take and store 24 50 ml samples for later analysis. The Resurgence of the QR Code and its Applications in Caving (22-24) investigates how QR codes have made a come-back, and suggests how cavers could benefit. He also provides some practical advice on how to generate them, and especially artistic QR codes, which research has revealed attract many more scans.