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One of them was the repair of radio and radio-phonograph sets and eventually, television. [4] Hugo Gernsback was an early publisher of repair manuals. Soon others were publishing. John F. Rider in the early 1930s began to compile complete volumes of radio servicing diagrams of many radio manufacturers called the Perpetual Troubleshooter's ...
Ericsson Radio Systems AB was the name of a wholly owned subsidiary in the Ericsson sphere, founded on 1 January 1983 by buying out all former owners of Svenska Radioaktiebolaget (SRA). The company was well known in Scandinavia and elsewhere in the 1980s, as it was deploying NMT systems and developing a line of mobile telephones under the brand ...
Manual service is telephone service in which a human telephone operator routes calls as instructed by a subscriber with a telephone set that does not have a dial. Dial service is when an exchange routes calls by interpreting subscriber-dialed digits. A telephone switch is the switching equipment of an exchange.
The first digital voice mode developed for EDACS was GE's Voice Guard, utilizing sub-band coding for its datastream at a rate of 9600 bps. Voice quality was not great, however, with it quickly being replaced by AEGIS. AEGIS was the second generation EDACS digital voice mode, made once again by GE, with Adaptive Multiband Encoding as its coding ...
[citation needed] As large cities had both manual and automatic exchanges for many years, the numbers for manual or automatic exchanges used the same format, which could be either spoken or dialed. [10] In the late 1940s, telephones were redesigned with the numbers and letters displayed on a ring outside the finger wheel to provide better ...
A trunked radio system is an advanced alternative in which the channel selection process is done automatically, so as to avoid channel conflicts and maintain frequency efficiency across multiple talkgroups. This process is handled by what is essentially a central radio traffic controller, a function automatically handled by a computer system.
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HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and towns in the counties) HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges)