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Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...
HP-15C. The HP-15C is a high-end scientific pocket calculator with a root-solver and numerical integration. A member of Hewlett-Packard Voyager series of programmable calculators, it was produced between 1982 and 1989. The calculator is able to handle complex numbers and matrix operations.
A full view of a typical vacuum fluorescent display (VFD) used in a videocassette recorder. Before the advent of on-screen displays, the only interface available for programming a home video recorder was a small VFD, LED or LCD panel and a small number of buttons. Correctly setting up a recording for a specific program was therefore a somewhat ...
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56 by 138 by 9 millimetres (2.20 in × 5.43 in × 0.35 in) The Sinclair Executive was the world's first "slimline" pocket calculator, and the first to be produced by Clive Sinclair 's company Sinclair Radionics. Introduced in 1972, the calculator was produced in at least two versions with different keyboard markings; a variant called the ...
ZX Spectrum graphic modes. The original ZX Spectrum computer produces a one bit per pixel, bitmapped colour graphics video output. A composite video signal is generated through an RF modulator, and was designed for use with contemporary 1980s television sets. The image size of the framebuffer is 256 × 192 pixels, with a palette of 15 non ...
2.4 GHz helical antenna radiation pattern (NEC simulation) The Numerical Electromagnetics Code, or NEC, is a popular antenna modeling computer program for wire and surface antennas. It was originally written in FORTRAN during the 1970s by Gerald Burke and Andrew Poggio of the Lawrence Livermore National Laboratory.
RPN, Forth, Lisp [2] HP 48G calculator, uses RPL. RPL [5] is a handheld calculator operating system and application programming language used on Hewlett-Packard 's scientific graphing RPN (Reverse Polish Notation) calculators of the HP 28, 48, 49 and 50 series, but it is also usable on non-RPN calculators, such as the 38, 39 and 40 series.