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CREG Newsletter 4
published in Summer 1989. (This is a bit-map scan).

Smaller Batteries Can Improve Loop Antenna Performance
David Gibson extends the expression for loop antenna performance to include battery mass.

Component News
Information on Multifuse resettable overcurrent protection, Polyswitch circuit protection, and laser diodes.

Portasol Gas Soldering Iron
Review of a portable gas soldering iron.

Review
A review of Mark Bodt's paper which describes the way in which electronics and computers can be combined to make a reliable device for cave surveying.

Computers in Surveying
Phil Ingham presents a short history of the use of computers in surveying.

Pannikins Cave Diving Rescue
An extract of a report on the use of radio equipment during a rescue in Australia.

Rechargeable Batteries
Stuart France relates his experience with Lead Acid and Nickel Cadmium batteries.