Martin, M5CIX, wrote:

There must be a book to be written on LF operating including a
glossery of terms (O, M etc).<

the book actually *was* written ... by Peter, G3LDO (see
http://www.rsgb.org/books/acatalog/RSGB_On_Line_Shop_What_s_New_26.html):


"The Low Frequency Experimenter's
                     Handbook

                     NEW !!

                     by Peter Dodd, G3LDO

                     The LF Experimenter's Handbook has been written to
meet the
                     needs of amateurs and experimenters who have an
interest in
                     low power radio techniques below 200kHz. Most of the
                     techniques described are targeted at those using the
136kHz
                     band, but they are also of great interest to readers
in New
                     Zealand and Australia with the 183kHz band and the
Lowfers in
                     the USA on 180kHz.

                     The bulk of the material in the book comprises
contributions
                     from experimenters world wide and covers antennas,
                     propagation, transmitters, special modes and test
equipment,
                     and discusses some applications such as communication
with
                     caving enthusiasts.

                     All those interested in exploring the new frontier of
the LF
                     bands will welcome this invaluable and unique
reference,
                     whether they tend to transmitting or are content just
to receive.

                     2000, RSGB,paperback 296 by 210 mm, 146 pages.

                     ISBN 1-872309-65-8"


This information comes a little bit late for a christmas gift .... but
anyhow: Merry Christmas, vy73

Geri, DK8KW (W1KW)