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Contents of journal 27
March 1997
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- CREG Journal
(PDF 10.7MB)
  Individual articles may be available below
- Contents
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- Conductivity Experiments at Castleguard Meadows
- Canadian cavers have been using electromagnetic methods to determine ground conductivity. Ian Drummond presents the results.
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- Guide-wire - the Feature
- This Journal takes guide-wire communication as its main theme. Mike Bedford sets the scene.
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- 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.
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- 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.
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- Guide-wire Quandary - VHF, HF, LF?
- Mike Bedford describes some experiments aimed at discovering which frequency is best for guide-wire communication.
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- Technicolour Cables
- Are some colours of cable more visible than others underground? Mike Bedford examines the evidence.
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- 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.
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- Membership Survey
- A questionnaire was sent to subscribers whose renewal fell due in September. M.C. Black analyses the results.
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- Nidderdale '96
- Richard Rushton looks back on our recent field meeting.
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- 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.
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- 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.
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- HF to UHF at RCM
- A report on cave passage propagation by Mike Bedford.
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- 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.
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- Foot Candles
- Footnotes to David Gibson's article 'Candlepower' in J26.
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- 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.
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- A Rubber Loop Antenna
- John Cleeve, G3JVC, presents constructional details for a loop antenna based on a bicycle inner-tube.
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- Letters to the Editor
- Letters.
-
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