What's a transmitter watch?

A “… transmitter watch …” could refer to any of several things. . Which of these you might be referring to would depend on where you heard (or read of) the term, and the context in which your source of information was using the term. . Here are some possibilities: . (a) Miniature transmitter (usually referred to as a “bug” ) concealed in a wrist watch and typically used for covert surveillance. This sort of device has often been written about in fictional spy stories like “ The Man from Uncle” and “James Bond”, but also exist in real life for use in such applications as industrial espionage, or law enforcement e.g. in order to allow plain-clothes officers to infiltrate criminal gangs and obtain evidence of the planning or execution of crimes.
. (b) Wrist watch type of design (not necessarily operating as a functional watch), containing an mp3 player and miniature FM transmitter that can provide a wireless link - e.g. to an FM car radio, to allow the media content stored in the player to be heard at high volume by all the occupants of the car. A home Hi-Fi with built in FM broadcast receiver can also be tuned in to receive such a signal. . (c) A functional wrist watch with built in “emergency transmitter” designed to be used, typically by aircraft pilots, to use as an “emergency position indicating radio beacon” (EPIRB). They can be used to transmit a distress signal that can be used by rescue services (e.g. coastguard, lifeboats, military helicopter crew etc. ) to locate the position of the transmitter and any survivors: . http://funadvice.com/r/14qeltp45gv . None of the devices described above would allow “two-way” communication, however, such communication devices have been produced that enable either simplex or duplex communication over relatively short distances. However such devices would be called “transceivers” (contraction of “transmitter” and “receiver”) rather than just “transmitters”. .

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