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December Fact-of-the-Day Index

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DateFact of the Day Topic
December 1Conductor Proximity Effect The current distribution in a conductor is affected by magnetic flux produced by current flowing in any adjacent ...
December 2Audio Transformer Frequency Response The low-frequency response of an audio transformer is down 3dB ...
December 3Ohmmeter Battery Compensation Most ohmmeters use one of two different methods to allow users to make ...
December 4Induction and Radiation Fields There is a mix of magnetic and electric induction fields and an electromagnetic radiation field at distances ...
December 5Broadside Array Gain The power gain of a broadside array of antenna elements is almost exactly proportional to ...
December 6Nickel-Cadmium Battery Discharging Nickel-cadmium (NiCd) batteries should be discharged to 1-volt per cell before they are recharged to avoid ...
December 7Nickel-Cadmium Battery Charging Nickel-cadmium (NiCd) batteries can be recharged approximately 800 times over a period of ...
December 8Nickel-Metal-Hydride Batteries Nickel-metal-hydride (NiMH) batteries have a useful life of about 400 charge/discharge cycles if ...
December 9Lithium-Ion Batteries Lithium-ion (Li-Ion) batteries have twice the charge density of ...
December 10Discount Lithium-Ion Batteries Beware of purchasing lithium-ion batteries that are offered at exceptionally low prices ...
December 11Average Hearing Characteristics The average hearing characteristics of a large number of people were first determined by ...
December 12Lightning Characteristics Most lightning strikes are associated with rain storms, but lightning strike risk is not ...
December 13Ground Rod Resistance Measurement The resistance between two ground rods spaced farther apart than ...
December 14Three Phase Power The current in leg B lags the current in leg A 120 degrees (1/3 cycle) and the current ...
December 15AC Power Baluns AC power is distributed to North American residences using a three-line circuit consisting of ...
December 16Non-Linear AC Loads RF interference conducted-by and radiated-from AC power lines plagues most everyone interested in ...
December 17Adcock Antennas Small, perfectly-balanced vertical loop antennas are useful for ...
December 18Dipole Arrays with Reflectors Dipole arrays backed by tuned reflectors are very difficult to tune, because ...
December 19Dipole Radiated Field Intensity The maximum field intensity from a half-wave dipole radiating 1,000 watts is ...
December 20Tuning Inductor-Input Filters Inductor-input power supply filter effectiveness can be increased by connecting a ...
December 21Virtually-Pure Horizontal Polarization Some applications, such as certain types of radio navigational aids, require antennas ...
December 22Superconductors Superconductors conduct electric current without energy loss, because ...
December 23Surface Mount Technology Open most any modern electronic equipment and you will find ...
December 24RoHS After July 2006 the European Union (EU) Directive on the Restriction of certain Hazardous Substances ...
December 25Fiber Optics Technology Fiber optic technology provides a method to transmit information from one place to another that is ...
December 26Fiber Optics Transmission Distance Several factors control the distance information can be transmitted down a fiber optics line ...
December 27Fiber Optic Cable Types There are two fundamental types of fiber optic cable, singlemode and multimode ...
December 28Rhombic Antennas Rhombic antennas used to be very popular shortwave broadcast antennas, because ...
December 29Phase-Shift Networks There are two fundamentally different types of variable phase-shift networks. One type ...
December 30Parasitic Oscillations Spurious parasitic oscillation usually is caused by regeneration in ...
December 31NE-2 Lightning Protection Sometimes NE-2 neon lamps are used on receiving antennas to provide protection from ...

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