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PostPosted: Tue 30 Dec 2008 13:43 
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Joined: Thu 01 Mar 2007 14:56
Posts: 42
Issue 71 of the CREG Journal has now been mailed.
(This is the late-running June 2008 issue.)

Subscribers should have received their copies by now. If your copy hasn't arrived,
you'd like to take out or renew a subscription, or you would like a sample copy, please
contact me at the address below.

Happy New Year!

Rob Gill
Editor CREG Journal
................................

The Cave Radio & Electronics Group (CREG) is a Special Interest
Group of the BCRA. It publishes a quarterly journal that is a truly
international forum for the publication of articles on cave electronics.

The annual subscription is still only £8.50 for UK subscribers.
(GBP 10.00 / US$ 15.50 / EUR 11.00 world-wide by surface mail or to Europe by
airmail. The airmail rate outside Europe is GBP 12.50, or about US$ 19.50).

An annual subscription gives you four issues. We can accept subscription payments by
cheque drawn on a UK bank, bank transfers, or secure Internet payments via NoChex
and PayPal.

Contents of Journal 71
--------------------------------

IP Ratings Revisited
Mike Bedford delves into the IEC 60529 standard that defines ingress
protection (IP) ratings to correct a common misconception. Two methods
of protection against the harmful effects of water vapour ingress – pressure
equalisation and desiccation – are also described.

A Caving Light for the 21st Century
Stuart France updates his white LED caving lamp design to incorporate new
LED, battery and control technology, and also looks at a powerful back-up light.

Novel Cave Radio Antenna uses Small Ceramic Tiles
Induction loop antennas are often inefficient due to skin and proximity effects,
self-capacitance and tuning losses. However, an electric field antenna will
generate a magnetic field which, in some circumstances, can exceed the field
strength available from a loop antenna of similar mass and power dissipation.
The main difficulty is in achieving efficiency at a small size. David Gibson
explains how this may be achieved using high-permittivity ceramic tiles.

Wireless in a Coalmine
Mike Bedford reproduces an article which was first published in 1922 by an
unnamed author with amateur radio callsign 2ZD, which provides an interesting
insight into the early days of experimentation in sub-surface communication.

Cave Technology Symposium 2008
BCRA’s second Cave Technology Symposium took place in April 2008.
Mike Bedford and Rob Gill review the proceedings with abstracts of
each of the presentations.

Plus regular features including, Wet & Dry, We Hear, Web Watch, Letters etc.


Searching for CREG articles:
-----------------------------------------
- http://bcra.org.uk/creg/jnl/ gives a Contents List of each Journal

- There is a searchable index as part of BCRA's Science Index.
See http://bcra.org.uk/creg/ for details

How to order
------------------
Follow the links at http://bcra.org.uk/creg/ to our payment pages.
Acceptable methods of payment are...

- online via PayPal or NoChex
- by bank transfer using our SWIFT and IBAN codes
- by cheque, through the post

If you need more information...
--------------------------------------------
http://bcra.org.uk/creg/
John Rabson <mailto:creg@bcra.org.uk>
John Rabson, Mare-le-Bas, 58800 CERVON, France

or contact me,

Rob Gill
Editor
Cave Radio and Electronics Group Journal
61 Cross Deep Gardens,
TWICKENHAM
TW1 4QZ, England

email: <mailto:creg-editor@bcra.org.uk>
web: www.bcra.org.uk/creg/


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