CREG Journal (ISSN 1361-4800)

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Contents of journal 120
December 2022

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CREG Journal 120 (0-20) (PDF 2.9MB)        Individual articles may be available below

This issue has a cover date of December 2022 and was published on 31 December 2022.

 

Front Cover (1) (PDF 358KB)     

A semi-duplex dual-wire cave telephone in operation. Photo: Nuraniya Ilyasova

 

Contents (2) (PDF 325KB)     

List of contents and masthead information.

 

News and Notes (2)  For download see previous item

CREG Committee Meetings, Regular Columns, Hybrid Field Meeting 2023, Rob Gill.

 

A Semi-duplex Dual-wire Telephone for Expedition or Cave Rescue Use (3-5) (PDF 696KB)     

Single-wire telephones have been featured here on several occasions. However, according to Gleb Kucherovskiy, despite its requirement for twice the weight and bulk of the line, twin-wire telephones can have performance benefits. Here he provides full constructional details of a twin-wire telephone for caving use.

 

A Miniaturised Radiolocation Beacon with a Ferrite Core (6-8) (PDF 559KB)     

Brian Pease describes a small self-contained radiolocation beacon that incorporates an antenna constructed from a stack of toroidal ferrite cores. This design eases transport and deployment underground, compared with larger frame antennas, and is useable to a depth of approximately 75m.

 

We Hear (9) (PDF 357KB)     

Roundup of news and events: Mike Bedford brings us the latest to impact the world of cave radio and electronics. Solid-State Batteries Closer to Reality, Affordable Shortwave UV Flashlight, Raspberry Pi as a Tiny PC for Caving Use?

 

Geophysical Survey Techniques (10-12) (PDF 562KB)     

Tony Haigh provides an overview of a number of non-invasive techniques that have potential for discovering caves, mines and other underground features.

 

Investigating Licence-free 433MHz and 2.4GHz Modules for use in Caving Projects (13-15) (PDF 446KB)     

433MHz and 2.4GHz transmitter, receiver and transceiver modules are cheap, and may be used legally in many countries. Mike Bedford considers how they may be used for caving applications and provides some practical guidance.

 

HF Radio Experiments at Fort Stanton Cave, New Mexico, USA (16-19) (PDF 702KB)     

Fort Stanton Cave continues to be explored, with current progress and campsites some 20km from the entrance. John T. M. Lyles, of the Fort Stanton Cave Study Project, has been testing HF radio data transmission as a possibility for communications in the cave.

 

Letters to the Editor (19) (PDF 203KB)     

Viewing stereo images, Stuart France, Brian Pease.

 

Digital Object Identifiers - Part 1 (20) (PDF 251KB)     

Digital Object Identifiers (DOI) are persistent long-lasting references, usually bound to a URL and intended to identify an online document. This makes them slightly different to, for example, an ISBN (book number), which merely identifies a product, because a DOI can also deliver a product. In this brief overview, David Gibson explains the DOI system used by the British Cave Research Association and, in part 2, will give examples of the webserver coding. He notes that BCRA does not use an official DOI implementation because surely, a URL is just a URL?