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November Fact-of-the-Day Index

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DateFact of the Day Topic
November 1Electrical Safety Grounds Electrical wiring to the power outlets in most modern homes and offices includes a safety ground (also called ...
November 2Guy Insulator Flashover Insulators generally should be used to break up tower guy cables into short, non-resonant lengths to ...
November 3Ring Antenna Systems Most vertically-polarized antennas with circular horizontal radiation patterns ...
November 4Japanese Semiconductor Numbers Japanese semiconductor part numbering tends to confuse Americans, both because ...
November 5Resistance Pads Resistance pads are used primarily as audio-frequency attenuators, although they can ...
November 61400 kHz Gyro Frequency Earth's magnetic field passes through the ionosphere and exerts a force on ionospheric electrons that ...
November 7RF Power Transistor Mounting Contrary to popular belief, the area around and under ...
November 8Vacuum-Tube Input Admittance The input load of a common-cathode vacuum-tube amplifier can be specified as ...
November 9U.S. Residential Phone Wiring Some telephones, answering machines, modems, and other equipment will not function correctly if ...
November 10VU Meters VU Meters were developed at Bell Laboratories to provide a standard way to measure ...
November 11Diversity Reception High-frequency signals from a distant transmitter fade at different times when ...
November 12Earth Conductivity & Dielectric Constant The dielectric constant and conductivity of earth vary greatly at ...
November 13Reducing DSL Interference High-power transmitters often interfere with DSL (Digital Subscriber Line) Internet circuits ...
November 14Rayleigh-Carson Theorem In 1929 John R. Carson published an extension of a theorem previously published by Rayleigh which is essentially ...
November 15Elliptical Polarization Elliptically polarized electromagnetic waves are produced wherever two ...
November 16American Wire Guage The American Wire Gauge (AWG) is used in North America to specify ...
November 17RF Ground Conductors Low impedance connections between radio equipment and a good ground system are important to ...
November 18Remote Inductive Tuning Remote adjustment of antenna tuning and phasing networks often is accomplished by ...
November 19Poynting Vector Method There are two fundamental methods of calculating the total amount of energy radiated ...
November 20Dielectric Constant Insulating medium separating the plates of a capacitor is called dielectric. A capacitor with vacuum dielectric has ...
November 21PEX Insulation Material PEX water pipe is made from cross-linked high-density polyethylene that has ...
November 22Electromagnetic Horns Electromagnetic horns have two primary communications applications. One is to ...
November 23Insulator Power Loss The insulating qualities of insulating materials are not perfect. Some ...
November 24Transmission Line Radiation All RF transmission lines other than waveguides and totally-shielded coax ...
November 25Precipitation Static Precipitation static is a continuous interference that tends to suddenly mask reception for ...
November 26Electromagnetic E/H Ratio Radio frequency energy in the space near a primarily magnetic field radiator, such as ...
November 27Coax Ice and Sun Shield It is not uncommon for large chunks of ice to fall from towers installed in ...
November 28Coax Power Derating Heat from direct summertime solar radiation on a coax cable can substantially lower ...
November 29Transmission Line Phase Shifters Transmission line propagation delay often is used to phase radiation from ...
November 30Tree Signal Attenuation If a vertical 28 MHz antenna is surrounded by moderately thick trees that are higher than the top of the antenna ...

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