Virginia Dare was the main character in Sallie Southall Cotten's 1901 book in verse The White Doe: The Fate of Virginia Dare. In the book, she is turned into a white doe by an Indian witch doctor after she rejects his advances.
Motorola DynaTAC 8000X TACS mobile phone. Advanced Mobile Phone System (AMPS) is an analog mobile cell phone system standard developed by Bell Labs, and officially introduced in the Americas on October 13, 1983, Israel in 1986, Australia in 1987, and Pakistan in 1990.t was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s. As of February 18, 2008, carriers in the United States were no longer required to support AMPS and companies such as AT&T and Verizon have discontinued this service permanently.
Digital Data/Analog Signals Must convert digital data to analog signal. One such device is a modem to translate between bit-serial and modulated carrier signals. To send digital data using analog technology, the sender generates a carrier signal at some continuous tone (e.g. 1-2 kHz in phone circuits) that looks like a sine wave. The following techniques are used to encode digital data into analog signals (Fig 2-18) Resulting bandwidth is centered on the carrier frequency. amplitude-shift modulation (keying): vary the amplitude (e.g. voltage) of the signal. Used to transmit digital data over optical ber. frequency-shift modulation: two (or more tones) are used, which are near the carrier frequency.