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C-QUAM. C-QUAM (Compatible QUadrature Amplitude Modulation) is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert, and Yoshio Sakaie, and published in an IEEE journal . Using circuitry developed by Motorola, C-QUAM uses quadrature amplitude ...
The R-390A is a general coverage radio receiver capable of receiving amplitude modulated, code, and frequency shift keying signals. Its tuning range is from 500 kHz to 32 MHz, in thirty-two 1 MHz bands. The circuit is the superheterodyne type, double conversion above 8 MHz, below which triple conversion is used.
Motorola Pageboy was the second pager produced by Motorola with individual-unit addressing, [clarification needed] after the lesser-known "Handie-Talkie Radio Pocket Pager" from 1955. [citation needed] The first pager-like system was used in 1921 by the Detroit Police Department. However, the first pager that we would today recognize as such ...
Pageboy II. Motorola’s Pageboy II was launched in 1975 for the United States and 1976 for Europe in various types. Pb II 5-tone only 68–88 MHz / 146–174 MHz (US and Eur). Pb II tone only for 5-tone 80,6–88 MHz / 146–174 MHz (US). Pb II tone & voice radio for 2-tone signalling systems 68–88 MHz / 146–174 MHz (US).
Barstool Sports CEO Dave Portnoy says he is lucky to be alive today after having to be rescued by the U.S. Coast Guard just outside of Boston.On Monday, the 47-year-old Massachusetts native and ...
John Francis Mitchell (January 1, 1928 – June 9, 2009) was an American electronics engineer and president and chief operating officer of Motorola. [3] [4] Mitchell led the pioneering development and implementation of Motorola's mobile phone technology producing the first portable transistorized pager and cell phone.
Motorola first introduced digital two-way radio in the U.S. in 1991 under the name ASTRO Digital Solutions. With the completion of the APCO Project 25 standard, Motorola introduced the ASTRO 25 solution and migrated its ASTRO Digital Solutions customers to ASTRO 25. Project 25 (also known as P25) is a suite of digital radio communications ...
Look up squelch in Wiktionary, the free dictionary. In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. [1] Essentially, squelch is a specialized type of noise gate designed to suppress weak signals.
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