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Contents of journal 11
March 1993
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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 6.0MB)
  Individual articles may be available below
- Contents. (This is a bit-map scan).
-
- Update
- Updates on past articles: Flashgun Slave, Radio Initiation of Detonators.
-
- Computers Underground
- Mike Bedford reviews two new ruggedised, hand held IBM compatibles.
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- Extending Battery Duration by Heating
- David Gibson investigates.
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- Which is the Best Frequency for Cave Radio?
- In part 1 of a series, Mike Bedford looks at the various types of interference present and presents circuits to assist in reviewing the LF / VLF bands.
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- Guide-wire Communications Review
- David Gibson gives a roundup of the various techniques referred to as 'guide-wire' communication.
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- Choosing a Battery Voltage
- How many NiCd cells should you string together into a battery? David Gibson shows there is a limit to this.
-
- Ferrite Rods as Receiving Antennas
- David Gibson explains the salient points of using ferrite cores and compares them with air-core antennas.
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- How Long Should a Wire Antenna Be?
- Despite the virtual universality of loop antennas for cave radio, there may be something to be said for using short whips. David Gibson reports.
-
- Photography with a Bang
- Cameras have been known to explode underground. Chris Howes investigates why and what can be done to prevent it.
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- Biasing Op-amps for Single-supply Circuits
- David Gibson gives circuit suggestions for using op-amps when you don't have a split supply rail.
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- SURVEY V1.2 Cave Surveying Software for PC Compatibles
- Dave Irwin reviews this latest version of cave surveying software for the IBM.
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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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