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CREG Journal
Contents

Constructing the 3496Hz 'D-Q' Beacon Receiver
Brian Pease provides constructional details for his 'double quadrature' receiver which is used in conjunction with his radio-location transmitter.

Low-noise RF Amplifier uses FET Cascode Input
John Hey presents an alternative RF amplifier for the G3TDZ cave radio. Much improved results are reported.

White LEDs: Introducing a New Generation
After years of waiting, the blue LED is finally with us. But closely associated is something of far more potential interest to the caver. Steve Clark reports on the first of the white LEDs.

Ground Shorts with a Single-wire Telephone
What happens when the conductor of a single-wire telephone is accidentally shorted to earth? David Gibson analyses where the current goes, and shows that shorts are not necessarily a problem.

Building them Tough - Rugged PCs Investigated
Think that caves and computers don't mix? Mike Bedford looks at some PCs which have got what it takes to withstand the cave environment.

LF Utility Stations
A list of transmitters operating in the LF spectrum, compiled by David Gibson from information supplied by Joerg Klingenfuss of Klingenfuss Publications, and others.

Ultrasonic Cave Mapping
Bill Sellers and Andrew Chamberlain describe an ultrasonic instrument for automatically recording a 3D model of a cave chamber.

European Rescue Meeting
French, Swiss and British cave radio enthusiasts met in Grenoble to discuss a rescue system for the Gouffre Berger in France. Chris Trayner reports.

Cave Radio Notebook
Edited by David Gibson, with contributions from John Hey and Chris Trayner. Topic 15 : 73kHz monopoles. 16: The 'thirds rule' for radio location. 17: An automatic level control. 18: A mixer for cave radio signals. 19: Under-sampling in a digital receiver. 20: Ground proximity and antenna de-tuning. 21: Deformation of loop antennas.

Staying on the Level
Mike Bedford offers advice on a novel method of levelling radio-location loop antennas, based on a suggestion by Chris Trayner.

Cave Television - SSTV Experiment on 73kHz
John (G3PAI) and Rosy Rabson describe the first ever cave radio operation on the 73kHz amateur band and the associated experiments with slow-scan television.

Letters to the Editor
Feedback, debate, information & news - our readers have their say.