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Following its founding, RCA acted as the sales agent for a small line of Westinghouse and GE branded receivers and parts used by home constructors, originally for a limited market of amateur radio enthusiasts. By 1922, the rise of broadcasting had dramatically increased the demand for radio equipment by the general public, and this development ...
In 2009, an agreement was made between Discount Two Way Radio Corporation (DTWR) and Technicolor SA to manufacture Two-way radio products under the RCA brand. [1] [2] RCA Two-way radios is the official sponsor of the United States Bobsled and Skeleton Team for the 2022 Winter Olympic Games in Beijing. [3]
Each connection to a telephone set required six wires from the key system: [5] One pair (two wires) carried the talk circuit (tip and ring), one pair carried control information, known as A-Leads, for that line, designated A and A1, and the third pair carried current to a lamp for the specific line key position on the telephone set (L and LG).
For example, some systems used two-tone sequential paging to alert a mobile or handheld that a wired phone was trying to call them. Other systems used DTMF. Some used a system called Secode 2805 which transmitted an interrupted 2805 Hz tone (in a manner similar to IMTS signaling) to alert mobiles of an offered call. Some radio equipment used ...
Renaming the Westrex system to Photophone was facilitated by the demise of RCA's cinema sound business unit, by the hand of General Electric, RCA's acquirer, and by its failure to protect the Photophone trademark. The Westrex system, briefly renamed Photophone, is still in use, with more than 100 systems currently in active service, world-wide.
Private line automatic ringdown (PLAR) is a type of analog signaling often used in telephone-based systems. When a device is taken off-hook, ringing voltage is automatically applied to a circuit to alert other stations on the line. When answered on another station, a call is maintained over the circuit.
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