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An antenna control unit utilizes the resulting difference signal to select the optimum signal strength for the particular step of the search pattern. This system is particularly applicable to extremely high frequency communication channels (86 GHz and above) which are subject to atmospheric distortion and noise .
RCA Spectra 70 Model 46. The RCA Model 70/46 (1967) [12] is a modified version of the 70/45 with an added capability for virtual memory. Advertisements for this computer as a timesharing machine referred to it as the Octoputer. [13] Programs can run in either 70/45 mode—without virtual memory—or in 70/46 mode with virtual memory enabled.
The best way to identify a pre-1964 Model 70 Winchester rifles is the serial number and the fore-end screw to secure the barrel to the stock. [6] Model 70 rifles with serial numbers below 700,000 [7] are the pre-1964 variety. The receivers of these Model 70s were machined from bar stock steel.
Model Products Corporation, usually known by its acronym, MPC, is an American brand and former manufacturing company of plastic scale model kits and pre-assembled promotional models of cars that were popular in the 1960s and 1970s. MPC's main competition was model kits made by AMT, Jo-Han, Revell, and Monogram.
An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. [1]: p.149 [2] The individual antennas (called elements) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship.
A patch antenna is a type of antenna with a low profile, usually consisting of a printed circuit board. It consists of a planar rectangular or circular sheet or "patch" of metal, mounted over a larger sheet of metal called a ground plane. It is the original type of microstrip antenna described by Howell in 1972. [1]
Often random wire antennas are also (inaccurately) referred to as long-wire antennas.There is no accepted minimum size, but actual long-wire antennas must be greater than at least a quarter-wavelength ( 1 / 4 λ) or perhaps greater than a half ( 1 / 2 λ) at the frequency the long wire antenna is used for, and even a half-wave may only be considered "long-ish" rather than "truly ...
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