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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 ...
Interest in Morris Beitman's "Most Often Needed Radio Diagrams" resurfaced in the early 1980s with the rise of restoring antique and collectible radios made before the 1940s. Vintage Radio, founded by Morgan E. McMahon, was a publishing company specializing in preserving early radio and television technology. [ 8 ]
This file is licensed under the United Kingdom Open Government Licence v3.0.: You are free to: copy, publish, distribute and transmit the Information; adapt the Information; ...
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)
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 ...
With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the called customer's line.
[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 ...
In radio communications, a base station is a wireless communications station installed at a fixed location and used to communicate as part of one of the following: a push-to-talk two-way radio system, or; a wireless telephone system such as cellular CDMA or GSM cell site. Terrestrial Trunked Radio