receiver-amplifier unit
41Bell TV — This article is about Bell Canada s satellite TV service. For Bell s IPTV service, see Bell Fibe TV. For the Bell Canada subsidiary that operates TV channels such as CTV, see Bell Media. Bell TV Type Subsidiary of Bell Canada Ind …
42Laser beam profiler — A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path. Since there are many types of lasers ultraviolet, visible, infrared, continuous… …
43Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …
44Motorola Minitor — Front view of the Minitor V pager. The Motorola Minitor is a portable, analog, receive only, voice pager typically carried by fire, rescue, and EMS personnel (both volunteer and paid) to alert of emergencies. The Minitor, slightly smaller than a… …
45telecommunications media — Introduction equipment and systems metal wire, terrestrial and satellite radio, and optical fibre employed in the transmission of electromagnetic signals. Transmission media and the problem of signal degradation Every… …
46Companding — Original signal After compressing, before expanding In …
47Transmitter — For biologic transmitters, see transmitter substance. Commercial FM broadcasting transmitter at radio station WDET FM, Wayne State University, Detroit, USA. It broadcasts at 101.9 MHz with a radiated power of 48 kW. In electronics and… …
48Sound recording and reproduction — Sound recorder redirects here. For the audio recording program computer software, see Sound Recorder (Windows). Sound recording and reproduction is an electrical or mechanical inscription and re creation of sound waves, such as spoken voice,… …
49SCR-299 — The SCR 299 was a U.S. Signal Corps mobile military communications unit used during World War II. HistoryThe SCR 299 replaced SCR 197 and SCR 597, and was an effort to give a long range communication advantage to the U.S. Army and its allies. To… …
50Nikola Tesla — Tesla, aged 37, 1893, photo by Sar …
