CREG Journal (ISSN 1361-4800)

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Contents of journal 52
June 2003

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CREG Journal (PDF 8.3MB)        Individual articles may be available below

Contents

 

Newssheet

On Future Constructibility; Rugby Radio Ceases Operations on 16kHz; Deregulation of CB Radio in the UK; PCBs for the Brian Pease radio-location beacon; CREG Award; Magazine binders; Diary Dates.

 

A Caver's View of Remote Imaging

Aerial photography of the entire UK is being published either electronically or as hardcopy. Imagery for other countries is also available, either from aircraft or satellite. Mike Bedford looks at what's on offer and how it may benefit cavers. (Note: there were problems in the printing process for this article. The illustrations are the wrong size and the captions are missing. A corrected version is available here(PDF 2123K).

 

Cyfarchiadau o Grughywel - Greetings from Crickhowell

Our spring 2003 field meet was held at the Chelsea Speleological Society's hut near Crickhowell in Wales. Richard Rushton describes the proceedings.

 

Electronic Cave Surveying Instruments

At the CREG field meet in March 2003, Wookey gave a talk on what the Group could do to help cave surveyors. This is an extended version of his presentation.

 

First Impressions of a 3D Laser Scanner

3D laser scanners are the state of the art in professional surveying equipment. Mike Bedford was given the opportunity to see one in action underground and reports on his experiences.

 

3D Radiolocation Using a Single Station

The satellite-based Global Positioning System (GPS) cannot be used underground, and similar low-frequency methods using time-of-flight are likely to be difficult to implement. The best method of achieving a similar 3D system is by monitoring field strength and direction. In this article, David Gibson describes how the distance, bearing and elevation of a surface-based transmitter beacon can (in theory) be determined from measurements at a single underground station.

 

Towards 3D Radiolocation Using Two Stations

Using two radiolocation beacon receivers at surveyed stations, it is possible to take readings of field strength and direction that allow the relative position of the transmitter to be derived without knowledge of its magnetic moment. Richard Rushton describes this technique, and his experimental verification in Eglwys Faen.

 

A Bibliography of Cave Radiolocation

David Gibson explains the state-of-the-art in radiolocation, and gives a list of 'further reading'.

 

2-Way Voice Communication with Cave Divers

Commercial 32kHz voice communications equipment, used by divers to talk to the surface, was converted into through-the-earth radios and used for diver-to-surface voice communications in underwater Florida caves. Brian Pease reports.

 

Using the HeyPhone with Primary Cells

Although rechargeable lead-acid and nickel metal hydride cells and batteries are the most cost-effective way of powering the HeyPhone, primary cells do have their place. Mike Bedford looks at the advantage of using primaries and describes a suitable battery pack for the HeyPhone.

 

A Wind-up Power Supply for the HeyPhone

Consumer products ranging from portable radios to torches are now available with wind-up power supplies. Mike Bedford looks at Motorola's wind-up mobile phone power supply and describes how to adapt it for use with the HeyPhone.

 

Inductance of Earth Antennas

Chris Trayner wondered whether the bunched wire of an earth electrode antenna that was not fully deployed would affect its inductance significantly.

 

Wet & Dry

Julian Coward investigates the light transmission properties of plastic food boxes, and chooses one to house his flashguns. Column edited by Richard Rushton.

 

Student Project Suggestions

From time to time, we have produced lists of projects suitable for undergraduate students to undertake as part of their degree course. Here David Gibson gives some suggestions.

 

Jean-Jacques Fauchez: Mission Accomplished!

Jean-Jacques Fauchez (F6IDE), well known for his work on cave radio, was awarded the CREG prize posthumously in 2002. In May 2003 Rosy and John Rabson travelled to the Vercors to present the award to J-J's widow Luce.

 

Letters to the Editor

Readers have their say on NiCd Batteries, Building HeyPhones, Noise Shielding, Dowsing, Heyphone Antenna Leads, US Radio Amateurs and 5MHz-Band Channels, UK to Alaska on 136kHz, a Caver-proof Computer and PSTN/PMR446 Interfacing.