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The experience gained with that alphabet resulted in several changes being made during by the ITU. Throughout World War II, many nations used their own versions of a spelling alphabet. The U. At least two of the terms are sometimes still used by UK civilians to spell words over the phone, namely F for Freddie and S for Sugar.

To enable the U. The CCB alphabet itself was based on the U. Army Field Manuals in the series. Several of these documents had revisions, and were renamed. Major F. According to a report on the subject: The results showed that many of the words in the military lists had a low level of intelligibility, but that most of the deficiencies could be remedied by the judicious selection of words from the commercial codes and those tested by the laboratory. In a few instances where none of the words could be regarded as especially satisfactory, it was believed possible to discover suitable replacements.

Other words were tested and the most intelligible ones were compared with the more desirable lists. But many sounds were unique to English, so an alternative "Ana Brazil" alphabet was used in Latin America.

Be easily pronounced and recognized by airmen of all languages. Have good radio transmission and readability characteristics. Have a similar spelling in at least English, French, and Spanish, and the initial letter must be the letter the word identifies. Be free from any association with objectionable meanings. Some users believed that they were so severe that they reverted to the old "Able Baker" alphabet. Confusion among words like Delta and Extra, and between Nectar and Victor, or the unintelligibility of other words during poor receiving conditions were the main problems.

Later in , ICAO decided to revisit the alphabet and their research. To identify the deficiencies of the new alphabet, testing was conducted among speakers from 31 nations, principally by the governments of the United Kingdom and the United States. Among the more interesting of the research findings was that "higher noise levels do not create confusion, but do intensify those confusions already inherent between the words in question".

Air Force research. After all of the above study, only the five words representing the letters C, M, N, U, and X were replaced. It was finally adopted by the IMO in Alfa is spelled with an f as it is in most European languages because the English and French spelling alpha would not be pronounced properly by native speakers of some other languages — who may not know that ph should be pronounced as f.

Juliett is spelled with a tt for French speakers, because they may otherwise treat a single final t as silent. In some English versions of the alphabet, one or both of these may have their standard English spelling. However, ITU would continue to maintain general procedures regarding distress signals.


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