optical spectrum frequency communications
121sun — sunlike, adj. /sun/, n., v., sunned, sunning. n. 1. (often cap.) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93… …
122MW DX — MW DX, short for mediumwave DXing, is the hobby of receiving the reception of distant mediumwave (known as AM in North America) radio stations. MW DX is similar to TV and FM DX in that broadcast band (BCB) stations are the reception targets.… …
123nanotechnology — /nan euh tek nol euh jee, nay neuh /, n. any technology on the scale of nanometers. [1987] * * * Manipulation of atoms, molecules, and materials to form structures on the scale of nanometres (billionths of a metre). These nanostructures typically …
124Cable television — CATV redirects here. For CAT5 cable, see Category 5 cable. Coaxial cable is often used to transmit cable television into a residence. Cable television is a system of providing television programs to consumers via radio frequency (RF) signals… …
125GSM — For other uses, see GSM (disambiguation). The GSM logo is used to identify compatible handsets and equipment GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard set developed by the European… …
126Morse code — Chart of the Morse code letters and numerals Morse code is a method of transmitting textual information as a series of on off tones, lights, or clicks that can …
127L band — NATO L bandThe NATO L band is defined as the frequency band between 40 and 60 GHz (5–7.5 mm). IEEE L band The IEEE L band (20 cm radar long band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 1 to 2 GHz.… …
128Waveguide (electromagnetism) — In electromagnetics and communications engineering, the term waveguide may refer to any linear structure that guides electromagnetic waves. However, the original and most common meaning is a hollow metal pipe used for this purpose.A dielectric… …
