Sunday Express Skeleton 24Th November...
Crosswords2 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.In the early days anyone with a normal radio could tune into Police broadcasts so they invented this code to get some privacy, but also to cut down radio time, and have less misunderstandings. Radio codes were not new, their forerunner was telegraphic codes, and of course shortened morse codes, one of which is the famous SOS.
It didn't take long for Police radio codes to become known, television programmes like Car 54 popularised them and the CB radio craze (remember that) got them into the public domain.
Different police forces develop dtheir own codes, there's not a standard list, but - and here I 'm going to part from Quizmonster - usually 10-4 means 'acknowledged, not yes. As does 'Roger'.
If you're interested in 'Roger', here is what Michael Quinion has to say:-
The letter R, expanded to Roger, was used to mean message received, and had been in use in that sense ever since the early days of Morse code. Since the operator was often acknowledging receipt of a message on which he would have to act in some way, the response came not only to mean that he had received it, but that he had understood it, a subtle but crucial extension. (If he wanted to say explicitly that he would carry out an instruction, he would add wilco, short for "I will comply". Hence all these handle-bar moustached aviators in films like The Dam Busters shouting "Roger, Wilco!" into their handsets before peeling off to do some deed of daring.)
This meaning for Roger became so stereotyped that it survived the shift to the international phonetic alphabet that almost everybody now uses, which instead has Romeo for R. It's a good thing it only came in after the War: "Romeo, Wilco!" doesn't have the same ring ...