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May Fact-of-the-Day Index

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DateFact of the Day Topic
May 1Cable Minimum Bend Radii Most cables produced by reputable manufacturers have two minimum bend radius specifications. One is the ...
May 2Silicon versus Gallium-Arsenide Varactors Varactors are solid-state voltage-variable capacitors that can be made of silicon or gallium-arsenide ...
May 3Reducing Radio Equipment Lightning Damage Electrical pulses induced in antenna systems by lightning have very fast rise and fall times ...
May 4Gas-Tube Coax Lightning Protectors Some gas-tube coaxial cable lightning protectors fire at a relatively low voltage if ...
May 5Dynamic Resistors Resistors are the most commonly used component in electronic circuits. In most applications best performance is ...
May 6Operational Amplifiers Solid-state operational amplifiers (op-amps) are widely used in a large variety of electronic circuit applications, but ...
May 7Tallest Radio Tower The 2,120 foot (646 meter) Warsaw Radio tower in Konstantynw, Poland was not only the tallest radio tower ever built, it was ...
May 8Sunspot Number Determination Some textbooks, magazine articles, and websites falsely state that the Sunspot Number is a count of ...
May 910.7 cm Solar Flux Karl Kansky, a Bell Telephone Company engineer, discovered previously unknown radiation coming from the sky in 1933 ...
May 10Lens Antennas Radio-frequency lenses can be used to focus radio waves as optical lenses are used to focus light waves. In fact, Yagi antenna ...
May 11Ground Rods in Rocky Areas It is practically impossible to drive a ground rod in some mountainous areas of the western United States and in ...
May 12Storing Lithium-Ion Batteries Many people falsely assume that lithium-ion batteries should be stored fully-charged. Even without that assumption ...
May 13Recalibrating Battery Charge Indicators Laptop computers, cell phones, handheld radios, and many other types of battery-powered electronic ...
May 14Ferrite Core Coil-Winding Considerations The mechanical properties of various types of ferrite vary. However, ferrite is a ceramic that generally breaks ...
May 15Reducing Ferrite Coil Capacitance It generally is best to keep coil capacitance as low as reasonably possible in most ferrite core applications ...
May 16Ferrite Magnetism Sintered ferrite contains crystals that generally range from 10 to 20 mm in size. Those crystals contain tiny, saturated, molecular magnets ...
May 17Multiple Antenna Interactions Because it is somewhere between difficult and impossible to design single antennas that have optimum ...
May 18Personal Computer Batteries All AC-powered personal computers have an internal battery that keeps the real-time clock running and that ...
May 19Toroid Filter Effectiveness Toroid AC power-line filters reduce line-noise many decibels in some cases and provide little benefit in others ...
May 20Folded Dipole Applications Folded dipoles usually are presented in textbooks and handbooks as providing a way to match 300-ohm twin lead. However ...
May 21Software, Firmware and Hardware The characteristics of early electronic equipment were determined by hardware. Hardware is ...
May 22RF vs. Lightning-Protection Grounds Some ground systems are installed primarily to make an antenna function correctly, such as where a ...
May 23Enhanced Single Sideband (ESSB) Most existing single-sideband transmitters and receivers filter nearly all audio-frequency components above ...
May 24Ultra-Flexible Antenna Wire The 41-strand, 14 AWG, ultra-flexible antenna wire that is sold in short-lengths at high prices under various private-label ...
May 25Voltage Induced in a Half-Wave Dipole A half-wave dipole collects RF energy from a broadside wavefront area of 0.1305 square wavelength. The RF ...
May 26Being 'On the Air' Amateur Radio operators often talk about being 'On the Air' or having been 'On the Air.' Broadcast radio announcers often say ...
May 27The Importance of Experimentation Experimenters are thought by many members of the general public to be amateurs, because ...
May 28Mathematics is not a Science Mathematics is an extremely important tool in all branches of science. Anyone interested in pursuing a science-career ...
May 29Approximate is Completely Wrong Philosophically Many understandings in electronics, and more generally in all of science, evolved from ...
May 30The Enormously Strong Electric Force Electrical forces within atoms are enormously strong compared to gravitational forces, but ...
May 31An Important Fact about Energy Physics courses and text books are loaded with information about energy. Many different forms of energy, such as ...

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