What does 73 in the radio mean?
The traditional sentence "73" appeared earlier than the early days of the development of cable telegrams. Its traces have been found in some of the earliest digital telegraph codes. Although individual versions have different definitions, they all have the same concept. That is, it indicates that the end or signature of the message will follow. But there is no information to confirm that it was actually used.
The first written record using "73" was the first edition of "The NaTIonal Telegraphic Review and Operators' Guide" in April 1857. At that time, "73" meant "My love to you"! After that, all the versions published in this book continue to use this definition. Many definitions of telegraph codes were used until now, but strangely, after a short period of time, the use of "73" began to change.
In the national telegraph treaty, this telegram code changed from a lover-style blessing sentence to a general signal of friendship. Here, "73" is a greeting, "a statement of friendliness among telegraphers", and is common to all telegrams.
Western Union set a standard of "92 yards" in 1859. This is to edit a series of commonly used sentences, and then use the numbers 1 to 92 to represent the power for the reporter to send and receive reports. In the "92 yards", "73" changed from a friendly signal to a widely circulated "accept my compliments", which was also a commonly used modified sentence at the time.
From 1859 to 1900, numerous telegraph manuals showed how its meaning evolved. Dodge's "The Telegraph Instructor" only describes it as "compliments". In "TwenTIeth Century Manual of Railway and Commercial Telegraphy", it has two definitions, one is "my compliments to you"; but it is only "compliments" in the abbreviated vocabulary. Theodore A. Edison's "Telegraphy Self-Taught" reverts to "accept my compliments". By 1908, in the later version of the Dodge manual, our definition of "best regards" appeared today, and the earlier meaning "compliments" can still be found in another part of the book.
Since then, "best regards" has always been the meaning of "73", but it also has a more intimate meaning. Today, amateur radio enthusiasts use it as James Reid's original intention of "a telegrapher's friendly statement" walkie-talkie.
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