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# format auto-updated on access: Mon 27-Nov-2017 11:29:43 +01:00 CREG Journal Contents An LF Field Strength Meter John Hey provides circuit details for a portable, sensitive field strength meter for cave radio use. 934MHz in KMC Tests at this UHF frequency were performed in Valley Entrance. Results were disappointing writes Chris Trayner. Measuring Receiver Performance A laboratory bench test provides a quantitative method of evaluating receiver performance that has advantages over field testing, argues Ian Drummond. The Demise of 73kHz The new 136kHz band will replace and not augment 73kHz. Chris Trayner reports. Surface Radio - Communication for Expeditions, part 1 This short series of articles by Mike Bedford presents the basics, considering both technical issues and licensing. Cave Radio Notebook 27: Report on radio-location at Jewel Cave, by Brian Pease. 28: Cross-modulation in rock?. Wet & Dry Richard Rushton re-introduces our regular column on rugged electronics, ergonomics and practical construction techniques. A Phonetically-Balanced Speech Intelligibility Test The audio equivalent of an optician's eye chart is a specially constructed word list that is used to measure the articulation loss of consonants. David Gibson explains how it is used and why consonants are important. Earth Current Field Strength Experiments Rob Gill outlines his earth current field strength measurements. A Shocking Experience Is earth current equipment likely to give you an electric shock? Rob Gill investigates. A Practical Flashbulb Firer Although flashbulbs are still in widespread use by cavers, the associated guns are hard to get hold of. A universal flashbulb firer project by Richard Rushton. Cave Telephones - Q&A We often get asked questions about communications equipment. David Gibson answers some queries about using telephones in an 800m deep cave in Spain. The Personal Cave Communicator John Hey presents the circuit of a new cave radio which can be built into a small belt-mounted enclosure. Web Watch Regular author Peter Ludwig looks at communications and mapping. David Gibson introduces his 'Virtual Foyer' and looks at Usenet. From Luggable to Portable - Improvements in LF Spectrum Survey Apparatus John Rabson, G3PAI, describes the improvements made to his system for automatically surveying the LF spectrum. New results explain anomalies with his previous surveys. Autumn '97 - New Developments on Show Steve Laugher reports on the October '97 Field Meeting. A Ferrite Rod for Radio-location A small ferrite rod offers an interesting alternative to a large air-cored loop for radio-location. Chris Ross describes his experiences with this type of kit. Letters to the Editor Feedback, debate, information & news - our readers have their say.