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Contents of journal 20
June 1995
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CREG Journal Archive:
This issue is available on paper as part of a two-volume archive,
covering issues 1 to 25.
To purchase it, please visit
Lulu.com.
- CREG Journal
(PDF 7.6MB)
  Individual articles may be available below
- Contents. (This is a bit-map scan).
-
- The GB2CRO - GB4CRO Link-up
- Mike Bedford reports on the recent HF link-up between underground stations operating from the Yorkshire Dales and South Wales.
-
- Talk-through Boxes
- A 'talk-through box' is the correct terminology for the type of 'repeater' needed to interface a cave radio to devices such as HF radios, telephones and so on. Mike Bedford and David Gibson explain the principles.
-
- Induction Radio or Telephone?
- Stuart France uses his experience with South Wales CRO to contrast the Ogofone with cable-laid telephones.
-
- Eavesdropping on Bats
- Dave Whiteley gives some background on bats and how to listen to them electronically.
-
- 49MHz Radios Underground
- Pete Allwright describes the use of 49MHz hands-free radios by the CRO in the Yorkshire Dales.
-
- Update - The France/Mackin Radio-location Beacon
- Mike Bedford gives further information about the tuning capacitors used in the France/Mackin beacon.
-
- Simplex Protocols for Cave Radios
- In a glossary and draft specification, David Gibson discusses the operation of a PTT switch, cueing tones, hands-free operation, and talk-through boxes.
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- PICs for Cave Radio Control
- Mike Bedford describes how a small PIC microcontroller can be used in a cave radio application; in this case, for a cueing tone generator.
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- High Power Switching Regulator
- David Gibson introduces a novel design.
-
- Earth Current / Induction Field Experiments - part 2
- Rob Gill reports on further experiments. Earth Rod Resistivity 20 Rib Gill compares a hexagonal array with a single long rod.
-
- Sodium Lamps for Caving
- Nick Williams and David Gibson describe the characteristics of these lamps.
-
- Update - An Ergonomic Loop Antenna
- Mike Bedford updates his earlier design.
-
- Signal/Noise Ratio - Part 1 of a Series on Receiver Noise Topics
- David Gibson introduces this series and explains the steps leading up to an expression for the s/n ratio of an induction loop receiver.
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- Cave Radio Notebook
- David Gibson's notes on 4: earth current communication, 5: circular polarisation, 5: [sic] ground conductivity.
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- Wet & Dry
- Our regular(ish) column on waterproof electronics. More on waterproof speakers by David Gibson.
-
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BCRA is a UK registered charity and is a constituent body of
the British Caving Association,
undertaking charitable activities on behalf of the BCA.
BCRA publishes a range of periodicals and books.
Click here for further information.
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