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• Annual Subscriptions (back to home page)
• Back Issues of the CREG Journal
• CREG Binders no longer available
• Bibliography of Underground Communications no longer available
• Book: Sub-Surface Communications
• Book: Radiolocation 
• HeyPhone printed circuit boards no longer available
• Flashgun Slave Unit

Information on How to Pay is at the foot of this page.

We can supply back-issues of the journal, at the following rates. These rates are based on 'cost price'. There is therefore no discount for bulk orders beyond the figure listed in the table below.

	Issue	Price
	issue #6 to present	£1.70
	issues #1 to #5, as a set	£3.40 for the set
	Quantity Discount	10% on four or more items
	Postage Zone	Postage/item
	UK, Channel Isles	postage free
	Europe (air) & World (surface)	£0.30 / item
	World (airmail)	£1.10 / item

This simple plastic clip allows you to file your CREG journals (or any magazines) in a ring binder or lever arch file. As you can probably work out for yourselves, the magazine simply slips into the long thin slot (see picture right), and the holes allow you to attach the clip to any design of ring binder.

CREG can no longer supply these binders because the supplier Viking Directare no longer stocks them. Judging from the results of a web search, and the enquiries posted to Ebay, they are now difficult to obtain. If anyone knows of a source of this product, please let us know.

This was originally compiled by Nick Williams, and published in 1992. The second edition, in 1995, was written by Chris Trayner and Nick Williams and contained over 700 references taken from caving journals, electronics and amateur radio magazines, academic journals, the trade press, conference proceedings, and text books.

The paper editions are now out of print, and we have no current plans to issue a new edition. The replacement for the paper edition, the In-Depth database is no longer supported either. However, you can peruse the list of contents of CREG journals at creg.org.uk/jnl/ and you can search by keywords in the BCRA Cave Science Index

Sub-surface or through-the-earth communication using electromagnetic fields - and specifically magnetic induction equipment - plays a key role in search and rescue systems used in the mining industry and, increasingly, by cavers and pot-holers. Similar equipment is used for radio-location, sub-surface surveying and geophysical measurements. David Gibson has been studying the techniques for many years now, and has written numerous papers and articles on the subject, many of them published in the CREG journal. David is in the process of re-formatting his PhD thesis on Channel Characterisation and System Design for Sub-surface Communications and adding to it a collection of his CREG articles. A draft edition of volume 1 of this work is available from 10th January 2004. For further details, see David's web page at caves.org.uk/radio/ and follow the link.

David Gibson has collected together his CREG journal articles on radiolocation into this single 70 page volume. Offered at 'cost price' this volume saves you having to consult several years' worth of CREG journals to find the articles on radiolocation. For further information, see David's web page at caves.org.uk/radio/ and follow the link.

The HeyPhone is the Cave Rescue radio used by various cave rescue groups in the UK. It was designed by John Hey with the support of CREG and the BCRC (British Cave Rescue Council). The unit is essentially an 87.5kHz SSB radio that operates into a tuned induction loop or earth electrodes. Circuit diagrams and instructions have been published in the CREG journal, and are available online, see heyphone.org.uk.

CREG no longer has a stock of PCBs for this project. Please see heyphone.org.uk for further information.

Commercial slave units are generally poor in performance. They are not sensitive enough for caving use, and can be triggered by light from a caplamp beam. In 1992 CREG published David Gibson's design for a high-performance slave unit suitable for cave photography. Kits of parts are still available and the design has proved to be very popular. (It now forms the basis of the Firefly II commercial slave unit). The circuit has been updated and enhanced several times and, in 2004, a new version, compatible with digital cameras, was released.

Documents giving constructional details of the latest versions are available - see caves.org.uk/flash/.

You can pay for your annual subscription by going directly to our On-line subscription payments page. Flashgun Slave Units are available via David Gibson's web pages but, for all other items (e.g. back issues etc), you will need to e-mail us to obtain a transaction reference number and then use our general payment page to pay over the Internet. In other words, the page you are reading now is just a price list - we do not have an online shopping page, 'as such'. We hope to correct this deficiency soon.

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