microwave transmitter
121Current loop — This article is about the electrical signaling schemes. For the oceanic phenomenon, see Loop current. A current loop describes two different electrical signalling schemes. Contents 1 Digital 2 Analog 3 Process control use …
122Wave radar — Ocean surface waves can be measured by several radar remote sensing techniques. Several instruments based on a variety of different concepts and techniques are available to the user and these are all often called wave radars. This article (see… …
123Cable 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… …
124Superheterodyne receiver — A 5 tube superheterodyne receiver made in Japan around 1955 In electronics, a superheterodyne receiver (sometimes shortened to superhet) uses frequency mixing or heterodyning to convert a received signal to a fixed intermediate frequency, which… …
125Doppler radar — Doppler effect A Doppler radar is a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection …
126Ultra high frequency — (UHF) designates a range (band) of electromagnetic waves with frequencies between 300 MHz and 3 GHz (3,000 MHz). Also known as the decimeter band or decimeter wave as the wavelengths range from ten to one decimeters. Radio waves with frequencies… …
127Lee De Forest — Infobox person name = Lee De Forest caption = birth date = birth date|1873|8|26|mf=y birth place = Council Bluffs, Iowa death date = death date and age|1961|6|30|1873|8|26|mf=y death place = Hollywood, Los Angeles, California occupation =… …
128Low-power broadcasting — Contents 1 United States 1.1 FM radio 1.1.1 LPFM classes 1.1.2 …
