CREG Journal (ISSN 1361-4800)

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Contents of journal 122
June 2023

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CREG Journal 122 (0-24) (PDF 4.4MB)        Individual articles may be available below

This issue has a cover date of June 2023 and was published on 6 June 2023.

 

Front Cover (1) (PDF 603KB)     

Stef Williams, CEO of Aerialworx, flying a DJI Inspire2 drone during a photoshoot. Photo: Aerialworx

 

Contents (2) (PDF 394KB)     

List of contents and masthead information.

 

News and Notes (2)  For download see previous item

Regular Columns, Articles for the Journal, Extending our Reach, Rob Gill.

 

A Practical Guide to Underground Film Making Using a Drone (3-4) (PDF 530KB)     

Drone use for in cave filming has grown substantially in recent years, but without some expert guidance, the results can be disappointing. Stef Williams, CEO of Aerialworx, provides her top tips for drone filming in caves.

 

Comparative Review of MF and HF Frequencies for Cave Radio (5-8) (PDF 637KB)     

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. Javier Moldes, EB1HBK, provides comparative results.

 

Letters to the Editor (9) (PDF 505KB)     

Phosphorescence, Mike Bedford; Skin, Proximity and Solenoid Effects, Ian Drummond.

 

An Improved Directional Draught Detector (10-12) (PDF 707KB)     

Seeking to determine if a slight draught reversed when he and fellow diggers were not present, Chris Hunter updated his earlier detector design to log direction and strength of draught.

 

Building Blocks (13) (PDF 331KB)     

Touch screen technologies and implementation – Part 1, by Tony Haigh.

 

Comparing Loop and Line Antennas for Cave Radio Applications – 1 (14-16) (PDF 381KB)     

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, David Gibson 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) (PDF 357KB)     

Roundup of news and events: Mike Bedford 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) (PDF 813KB)     

To meet a requirement for regular water samples, Guy Van Rentergem 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) (PDF 399KB)     

Mike Bedford 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.