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The Pioneer SX-1980 [1] [2] [3] is an AM/FM radio receiver that Pioneer Corporation introduced in 1978, to be matched with the HPM series of speakers. It was rated at 270 watts RMS per channel into 8 ohms , both channels driven.
December 1977: Introduces the world's first two-way addressable CATV system in the U.S. (with Warner Cable). 1978: Introduces SX-1980 receiver, Pioneer's most powerful receiver manufactured to date. February 1979: Introduces the industry-use Laserdisc player. June 1980: Introduces VP-1000 LD player for home use in the U.S.
In 1975 Ed Long [1] in cooperation with Ronald J. Wickersham invented the first technique to Time-Align a loudspeaker systems. In 1976 Long presented "A Time-Align Technique for Loudspeakers System Design" [2] at the 54th AES convention demonstrating the use of the Time-Align generator to design improved crossover networks for multi-way loudspeakers systems.
Marine VHF mostly uses half-duplex audio equipment and non-relayed transmissions. Ship to ship communication is over a single radio frequency ( simplex ), while ship to shore often uses full duplex frequency pairs, however the transceivers are usually half-duplex devices that cannot receive when transmitting even on a full-duplex channel.
Two-way voice communications - A two-way radio is an audio transceiver, a receiver and transmitter in the same device, used for bidirectional person-to-person voice communication. The radio link may be half-duplex , using a single radio channel in which only one radio can transmit at a time. so different users take turns talking, pressing a ...
Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...
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