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In electronics, a step recovery diode (SRD, snap-off diode or charge-storage diode or memory varactor [a]) is a semiconductor junction diode with the ability to generate extremely short pulses. It has a variety of uses in microwave (MHz to GHz range) electronics as pulse generator or parametric amplifier .
Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [1]
Name Unit cost (2024) Type Production status Frequency range Max bandwidth RX ADC bits TX DAC bits TX capable Sampling rate Frequency accuracy ppm Panadapters / Receivers
dismantled c. 1953 [35] 12 kV: 16 + 2 ⁄ 3 Hz France: lines in Pyrenees: Chemin de fer du Midi: most converted to 1,500 V 1922–23; Villefranche-Perpignan diesel 1971, then 1,500 V 1984 12 kV: 25 Hz United States: Washington, DC – New York City: Northeast Corridor (NEC), Amtrak: 11 kV until 1978 Harrisburg, Pennsylvania to Philadelphia ...
Processes are intended to support the objectives, according to the software level (A through D—Level E was outside the purview of DO-178B). Processes are described as abstract areas of work in DO-178B, and it is up to the planners of a real project to define and document the specifics of how a process will be carried out.
Scholz Research & Development, Inc. was the name of the company founded by musician and engineer Tom Scholz to design and manufacture music technology products. Scholz is an MIT-trained engineer who developed many of his skills as a product design engineer working on audio-production equipment at Polaroid in the early 1970s.
After previous connectors were deprecated in USB 3.2, the new USB-C plug has become a new standard for charging (and data transfer) over USB. [13] In the European Union, the Radio Equipment Directive 2021/0291, requires new smartphones to use USB-C as a universal charger by the end of 2024, and laptops by 2026. [14] [15]
The 1990 Mercedes-Benz SL base model was the 228 hp 300 SL version [11] (European 300 SL-24) equipped with a five-speed manual or five-speed automatic transmission, but it was the 322 hp 500 SL (with a 5.0-litre V8 engine) which made the most headlines. For model year 1993, the 600 SL was additionally introduced stateside.