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August Fact-of-the-Day Index

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DateFact of the Day Topic
August 1Electrostatic Discharge Risks to Equipment Humans become electrostatically charged as they do ordinary things such as ...
August 2RMS or Effective Voltage The amount of power being delivered to a DC circuit load can be calculated easily by dividing the load resistance into ...
August 3Quantum An observable quantity is said to be quantized if its magnitude is restricted to a discrete set of values throughout at least part of ...
August 4Light Speed Measurement Light and radio waves are both electromagnetic radiation. The difference between them is merely frequency (or ...
August 5Antenna Tuner Circuits A variety of antenna tuner circuits can be used in both feed-line-to-antenna and feed-line-to-radio applications ...
August 6Logic Logic is a study of sound reasoning that focuses on a study of arguments. An argument is a series of statements called premises that lead to ...
August 7Surface Mount Technology Nearly all electronic devices manufactured today use surface-mount technology. There are several reasons, but ...
August 8Can Electromagnetic Radiation be Stopped? Almost everyone knows that electromagnetic radiation travels at the velocity of light in a vacuum ...
August 9Static Crashes It is well known that lighting causes static crashes, but it isn't so well known ...
August 10Earth's Resistance The earth's DC resistance in a circuit where the earth constitutes one of two conductors is essentially zero ohms, because ...
August 11Feed-Line Impedance Conditions for maximum power transfer through a transmission line require source and load impedances to be conjugates, respectively ...
August 12Self-Inductance Self-inductance is a property of electrical circuits that causes them to oppose a change in current flowing through them ...
August 13Radio Line-of-Sight Variations in the atmosphere's refractive index with height cause the paths of direct radio waves between transmitting and receiving antennas ...
August 14Tropospheric Reflections Small discontinuities in dielectric constants at the boundaries of different air masses often cause tropospheric reflection of VHF, UHF and microwave ...
August 15Space-Wave Intensity A horizontal half-wave dipole transmitting antenna radiates energy toward both sky and earth. The portion radiated toward earth reverses phase ...
August 16RMS Current RMS is an abbreviation for the 'root mean square' mathematical process of determining the effective value of an alternating current ...
August 17Great Circle Route Radio Amateurs often refer to the 'great circle route' between two stations, but what exactly is a 'great circle route?' ...
August 18Why is Transmitter Output Called Power? In mathematics, a power of a number indicates repeated multiplication. For example, 'x to the third power' means 'x multiplied by itself three times.' ...
August 19Carbon Resistor Noise Resistors composed of carbon granules generate far more noise than thermal agitation noise when current flows ...
August 20Thermal Agitation Noise Noise voltages due to thermal agitation in resistors set limits on the smallest signal voltages that can be amplified without being lost ...
August 21Magnetic Reluctance The magnetic circuit property that determines the relationship between magnetic flux and corresponding magnetomotive force (mmf) is called ...
August 22Ferrite-Core AC Hum Precaution The nonlinear magnetic characteristics of ferrite makes ferrite cores sensitive to hum pickup from stray 50/60 Hz magnetic fields ...
August 23Ferrite-Core Temperature Precaution The inductance of coils wound on ferrite cores change substantially above a certain temperature that depends on the grade of ferrite ...
August 24Inductance The practical unit of inductance is the henry. However, the inductance of most inductors is expressed in millihenrys or microhenrys ...
August 25AM Broadcast Band Filters The performance of most HF communication receivers is significantly degraded by high-power AM broadcast stations...
August 26Antenna Array Patterns Antenna array patterns determined by multiplying the patterns of individual elements tend to be only approximations ...
August 27Realization of Antenna Patterns Realization of calculated antenna patterns requires great skill in design, adjustment, and attention to details ...
August 28RF Linear Amplifiers SSB, FM and FSK transmitters nearly always have low-level modulators. AM transmitters can have either low- or high-level modulators ...
August 29Sound Loudness Most people do not realize that because of the non-linearity of human hearing it is necessary to increase mid-frequency sound power ten times ...
August 30Wire Inductance vs. Frequency Wire inductance changes somewhat with frequency because of the way current distribution within a wire changes with frequency ...
August 31Feed-Line Impedance Matching Engineers discovered long ago that any electrical circuit that can be constructed from a finite number of lumped inductor and/or capacitor elements ...

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