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Internationales Signalbuch · 1931
- this page is a stub
This book is titled Internationales Signalbuch 1931 - Band II,
Funkverkehrsbuch
(International Signals Book 1931 - Volume II, Radio Traffic Book).
It was published by Walter de Grunter & Co in Germany (1931)
under the authority of the
Reichsverkehrsministerium (National Traffic Ministery).
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The book is intended for encoding radio traffic that was usually send
via the short-wave radio bands (SW) by means of
morse code in the days between
WWI and WWII (interbellum).
It contains many frequently used expressions and parts of
complete sentences, and converts them into 5-letter codes.
This shortens a message drastically.
This was initially done to reduce the cost of the transmission.
At the time, important messages were sent by telegraph — via telegraph
wires or via radio — at a price per character. Encoding a message
made it much more cost effective.
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When sending the message via radio — this was commonly done by
means of morse code —
a shorter message also means that the transmitter is on air
much shorter, reducing the chance of
interception and discovery by
means of Radio Direction Finding (RDF).
This was particularly useful in the event of a war, in which enemy
interceptors were constantly hunting for hostile signals.
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New Boe Code Book, which works similarly
and has built-in error correction.
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