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January Fact-of-the-Day Index

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DateFact of the Day Topic
January 1Waveguide Connections A very satisfactory low-loss connection can be made between two waveguides by ...
January 2Waveguide Attenuation Waveguides can support traveling waves at frequencies higher than their ...
January 3Electron Facts Electrons are the obvious basis of everything electronic. Electric voltage, electric current ...
January 4Incandescent Lamp Life Miniature and subminiature incandescent lamps are widely used as status indicators and to ...
January 5Microphone Directivity All microphones respond primarily to changes in air pressure or air velocity, but not to ...
January 6Aurora Color Significance The most commonly seen aurora color is brilliant yellow-green which is produced when ...
January 7Meaning of 'Aurora Borealis' Red is the most common color of auroras seen in Italy where the scientist ...
January 8Ionospheric Wave Split The earth's magnetic field can cause the ionosphere to have two refractive indexes, so that ...
January 9Loop Antenna Shape It often is said that loop antennas should enclose the greatest possible area and that ...
January 10LED Advantages Light Emitting Diodes (LED's) have many advantages compared to incandescent lamps. They are ...
January 11Surge Protectors A variety of devices used to limit power-line voltage surges can be classified as surge protectors ...
January 12Service Entrance Surge Protection Electric service entrance surge protection is important both to human safety and to ...
January 13Point-of-Use Surge Protectors A point-of-use surge protector should protect each item of ...
January 14Lightning Surge Transmission Modes Most homes have three incoming power lines. One is grounded (usually at both ends) ...
January 15Metal Oxide Varistors Most surge protectors installed inside homes are a type known as Transient ...
January 16Visible Clouds in the Ionosphere? Lumpy clouds of ionized gas in the ionosphere often return radio signals to earth. The returned ...
January 17Temperature vs. Reliability Electronic equipment life is directly related to operating temperature according to the Arrhenius function ...
January 18Why Copper Ground Rods? 'Copper ground rods' actually are copper clad steel, because copper rods would be too ...
January 19Graphite Ground Enhancement Some people recommend mixing graphite with the soil surrounding copper ground ...
January 20Lithium Polymer Batteries Lithium polymer (Li-Poly) batteries are the latest and greatest batteries for cell phones ...
January 21Maximizing Battery Performance The most common reason for poor rechargeable battery performance is ...
January 22Solar Flares Solar flares are incredibly powerful solar explosions that release a force equal to ...
January 23Sporadic-E Reflections The large volume of sporadic-E ionospheric communications logged by ...
January 24Electrostatic Breakdown The 'static' part of the term 'electrostatic' implies an electric field that doesn't ...
January 25Human RF Radiation Risks Radiant RF energy is non-ionizing and is believed to not have cumulatively damaging ...
January 26Misuse of 'Electrostatic' It is common for Amateur Radio literature and even some scholarly papers written by PhD's to state that ...
January 27Broken Safety Grounds Electric power outlet safety grounds (also called equipment grounds) generally return to ...
January 28RF Amplifier Impedance Matching It often has been written and most people seem to believe that the output impedance ...
January 29Suitability of Electrical Insulating Materials Both electrical engineers and radio amateurs tend to focus on ...
January 30Ground Plane Radials The number of ground plane antenna radials needed for efficient operation depends on ...
January 31WWV Time Standard In 1999 National Institute of Standards station WWV in Fort Collins, Colorado, began using a new ...

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