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# format auto-updated on access: Mon 27-Nov-2017 11:29:58 +01:00

CREG Journal
Contents. (This is a bit-map scan).

Update
Updates on recent articles: Flashgun Slave, Laser Rangefinder, Electronic compass & Clinometer.

Theoretical Considerations for a Low Noise Pre-amp
David Gibson considers this, the most critical stage of a cave radio receiver.

A New Technique for Speech Signal Enhancement
David Gibson reports on a new technique which claims a 20dB increase in s/n ratio using a microprocessor.

VLF Transverter for CB Radio
Ian Drummond outlines his design a low cost alternative to a custom built cave radio.

An Electronic Cave Surveying Instrument
Compass, clinometer and rangefinder combined - Mark McLean presents the basic principles.

The State of Cave Surveyors
David Gibson offers an opinion in the latest episode in this ongoing saga.

Waterproof Housings & Components
Housings, connectors, switches and indicators come under the spotlight in this, the first of a new series, by David Gibson.

Loop Antenna Construction
In our cover feature, David Gibson suggests some novel alternatives to loop construction.

Circuit Simulation using PSPICE
Keith Jackson describes how to prototype your circuit without even building it.

The Optimal Design of a Cave Radio
Notes based on David Gibson's talk at last year's BCRA conference.

Which is the Best Frequency for Cave Radios?
Following Mike Bedford's look at the spectrum, David Gibson discusses some theoretical points.

An Introduction to Induction Cave Radio
In the second of our series for newcomers to cave radio we take a look at the principles of inductive communication.

A NiCd Charger and Conditioner
David Gibson discusses a possible practical design.

A Solar Powered Battery Charger
Reprint of a Maxim application note & circuit.