CREG Journal (ISSN 1361-4800)

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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.
 
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.
 
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.
 
Cave Radio Notebook
David Gibson's notes on 4: earth current communication, 5: circular polarisation, 5: [sic] ground conductivity.
 
Wet & Dry
Our regular(ish) column on waterproof electronics. More on waterproof speakers by David Gibson.
 

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