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contents of j27
March 1997
- Conductivity Experiments at Castleguard Meadows
- Canadian cavers have been using electromagnetic methods to determine ground conductivity. Ian Drummond presents the results.
- Guide-wire - the Feature
- This Journal takes guide-wire communication as its main theme. Mike Bedford sets the scene.
- Hi-Z SWTs
- David Gibson takes a brief look at single-wire telephones, and compares Lovell's high impedance version with Michie's standard design.
- Single Wire Telephones for Mines Rescue
- David Gibson recently visited a Mining consultancy, to find out what commercial communications equipment was used by Mines Rescue teams, and whether it would be suitable for cavers.
- Guide-wire Quandary - VHF, HF, LF?
- Mike Bedford describes some experiments aimed at discovering which frequency is best for guide-wire communication.
- Technicolour Cables
- Are some colours of cable more visible than others underground? Mike Bedford examines the evidence.
- Guide-wire in Action - the SCMC Experience
- An interesting technique or a useful method of communication? Peter Eggleston describes SCMC's success with CB guide-wire.
- Membership Survey
- A questionnaire was sent to subscribers whose renewal fell due in September. M.C. Black analyses the results.
- Nidderdale '96
- Richard Rushton looks back on our recent field meeting.
- An Automated LF Spectrum Survey
- Which are the quiet spots in the LF spectrum? John Rabson, G3PAI, hooks up a communications receiver to a PC and plots the results.
- Packet Radio Goes Underground
- Bob Bruninga, WB4APR, presents an amusing account of his experiments with VHF underground, and considers the merits of a packet repeater system.
- HF to UHF at RCM
- A report on cave passage propagation by Mike Bedford.
- Build a Cascade Unit for Electronic Flashguns
- You've seen the pictures, now build the unit. Ian Drummond presents his flashgun cascade unit as a constructional project.
- Foot Candles
- Footnotes to David Gibson's article 'Candlepower' in J26.
- Determining Depth by Radio-Location: An Extreme Case
- At a depth approaching 200m radio-location is not easy. Brian Pease compares practical measurements using his beacon, to a theoretical model.
- A Rubber Loop Antenna
- John Cleeve, G3JVC, presents constructional details for a loop antenna based on a bicycle inner-tube.
- Letters to the Editor
- Letters.
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The CREG journal (ISSN 1361-4800) is published quarterly by the Cave Radio & Electronics Group of the British Cave Research Association. BCRA is a UK registered charity and is a constituent body of the British Caving Association, undertaking charitable activities on behalf of the BCA. CREG's aims are, by means of a regular Journal, other publications and meetings, to encourage the development and use of radio communications and other electronic and computer equipment in caving and related activities.
Annual Subscriptions are currently £8.50 (UK). The overseas rates are £10 (EU), £10 (World, surface mail) and £12.50 (World Airmail). Most back issues are still in print. For details, please contact CREG.
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