For information on designing transformers see if you can find a copy of the
"AWV Radiotron Designers Handbook". This book has its origins pre second
world war in Australia and contains all sorts of necessary information. I
believe it has been re-issued recently on CD ROM, and is well worth getting
if you can track it down.

An alternative would be to look for a copy of the ARRL or GSGB handbooks
which may have sufficient information on this for your purpose.

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