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Contents of journal 48 June 2002
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- CREG Journal
(PDF 4.7MB) Individual articles may be available below
- Contents
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- Newssheet
- Comment: CREG PCBs; Heyphone Documentation; Derbyshire CRO's 50th Year; Next Field Meet; Paying BCRA Subscriptions via CREG; Annual General Meeting, CREG Prize; Diary Dates.
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- The March 2002 Field Meet
- This joint radiolocation event with the Cave Surveying Group was held in Ingleton. Richard Rushton and Rob Gill report.
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- Trigonometric Radiolocation in a Plane
- Richard Rushton describes how making measurements at fixed points can allow us to locate radiolocation beacon by simple trigonometry, provided we are working in a single plane.
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- Cave Radio Notebook
- 49: Trigonometric Radiolocation, 50: Finding Ground Zero (Peter Martinez). Edited by David Gibson.
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- 3496Hz Radiolocation Beacon: Construction Update
- Brian Pease's beacon was described in the CREG journal in 1997. John Hey recently constructed two beacons to Brian's design, and relates his experiences.
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- HeyPhone Documentation on the Web
- The HeyPhone documentation has now been updated with corrections and additional information. Mike Bedford indicates what you can now find on-line.
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- HeyPhone System Update: Using Molefone Audio Equipment
- Many CROs are now re-equipping with HeyPhones, but there are some Molefone add-ons which may be worth converting for HeyPhone use. Chris Trayner explains Molefone audio equipment.
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- Cave Surveying by Radio-Location - 3
- Cave radiolocation relies on magnetic fields and a crucial assumption is that these fields behave in a 'quasi-static' manner. David Gibson explains how the conductivity of the ground distorts the field lines, leading to error, and derives some new methods of eliminating these errors.
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- A Tone-generator for Setting-up the HeyPhone
- For initial testing of the HeyPhone, rescue teams need to be able to compare signal strengths from different locations and with different antenna configurations. Mike Bedford describes an add-on tone generator which will permit this.
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- A Field Strength Meter for the HeyPhone
- Mike Bedford describes an audio field strength meter which can be connected to the HeyPhone for set-up and testing.
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- HeyPhone System Update: Powering External Equipment
- The Heyphone microphone socket can be used to power external equipment, but some versions require an adapter. Chris Trayner gives the details.
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- Design Directory: Radiolocation and Cave Radio
- Under the classifications of 'building equipment', 'introductory articles', 'further reading' and 'historical reading', David Gibson lists some CREG journal articles that will give you some insight into the current state-of-the-art of radio-location beacons and cave communications using induction radio equipment.
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- Flashgun Slave Unit for Digital Cameras
- Digital cameras often have a built-in flashgun that gives a small pre-flash in order to set the colour balance. A slave unit must respond to the second flash pulse. David Gibson describes how his slave unit can be adapted to achieve this.
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- Bulb Firer Adaptor for Electronics Guns
- Flashbulb firers based on capacitor discharge circuits may damage, or be damaged by electronic flashguns. David Gibson describes a simple experimental adapter that allows a slave-driven bulb firer to be safely used with flashguns.
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- Wet & Dry
- Laptop computers, GPS and PMR radio - Mike Bedford reviews examples of rugged and waterproof equipment.
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- Letters to the Editor
- Early LED power controllers, DF Beacon Tests, PCB Design.
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- Web Watch
- Peter Ludwig has found even more lighting and battery sites.
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- Correction
- Jean-Jacques Fauchez, CREGJ 47.
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- Palm Programming for Embedded Applications
- Electronic devices often require a user interface. This is frequently based on a microcontroller and an LCD module. Martin Melzer describes another approach, using a Personal Digital Assistant (or PDA) made by Palm, Inc.
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- Meet the CREGgies (6)
- Rosy Rabson interviews Rob Gill, John Rabson and Jean-Jacques Fauchez.
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