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Signalbuch
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).

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.
  
Close-up of the title of the Internationales Signalbuch 1931

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.

    More information about this book will be made available in due course. A similar book, that was used for international radio traffic, is the New Boe Code Book, which works similarly and has built-in error correction.
Close-up of the title of the Internationales Signalbuch 1931 The complete codebook of 1931. It is over 6 cm thick! A peek inside the codebook. It contains many chapters on special subjects. Close-up of a page from the codebook
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Close-up of the title of the Internationales Signalbuch 1931
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The complete codebook of 1931. It is over 6 cm thick!
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A peek inside the codebook. It contains many chapters on special subjects.
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Close-up of a page from the codebook

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