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February Fact-of-the-Day Index

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DateFact of the Day Topic
February 1Grounding Steel Towers Steel towers obviously should be grounded for lightning protection whether or not grounding is needed for ...
February 2Heat Shrink Tubing Heat shrinkable tubing is widely used to insulate irregularly shaped objects, such as cable spices, to ...
February 3Rotary Switch Cleaning Corrosion tends to build-up more on rotary switch contacts than on the contacts of most other types of switches, because ...
February 4Bandwidth and Impulse Noise There many types of radio noise that can be classified various ways. Two common types are ...
February 5Noise Blanker Effectiveness A noise blanker blocks signal processing in a receiver for the duration of each noise pulse that ...
February 6Decibels and Logarithms Most people seriously interested in technical aspects of radio know that a decibel is one-tenth of ...
February 7Meaning of 'Harmonic' The term 'harmonic' has several meanings in science and mathematics, some of which have little or no obvious relationship ...
February 8Antenna Sag Curve A flexible antenna wire supported from two end points forms a catenary curve due to the pull of gravity if ...
February 9External Anode Tubes All vacuum tube elements were encased in a tube in early designs. That practice continued for most ...
February 10Direction Finding Antennas A wide variety of radio direction finding antennas have been developed, including ...
February 11Direction Finding Antenna Size I.E.E. Journal, 1949, Vol. 96, Part III, p. 321, contains, what was at the time ...
February 12R/C Integrators Most electronic textbooks and handbooks have a section about 'R/C integrators.' A single-section R/C integrator ...
February 13R/C Differentiators Most electronic textbooks and handbooks have a section about 'R/C differentiators.' A single-section R/C differentiator ...
February 14Maxwell's Four Equations In the 1870's James Clerk Maxwell was able to put together four important equations that govern ...
February 15Trigonometry Trigonometry is fundamentally a study of triangles. The primary focus is on six simple functions ...
February 16Fractals A fractal is a shape that contains an infinite amount of self-similar fine detail. Consider white noise, for example ...
February 17Calculus Calculus is fundamentally a study of rates of change, but extends to much more. Rate of change information ...
February 18External Cross-Modulation External cross-modulation refers to conditions where two or more radio frequency signals ...
February 19Linear Power Amplifier Distortion The most important linear power amplifier characteristic is the relationship between ...
February 20Antenna Capacity Tops A grounded (or low-impedance base-fed) vertical antenna can be fitted with a capacity top (also called a capacity hat) to ...
February 21Resonant Wideband Antennas All resonant antennas that have good performance over wide bands of frequencies have ...
February 22HF Vacuum-Tube-Amplifier Parasitic Oscillations Vacuum-tube-amplifier parasitic oscillations can be classed into ...
February 23LF Vacuum-Tube-Amplifier Parasitic Oscillations An unwanted oscillation below the normal operating frequency of an RF amplifier is ...
February 24Dynatron Parasitic Oscillations Resistive loads make resonant oscillations die out sooner, because ...
February 25Push-Pull Amplifier Harmonics A simple tuned circuit at the output of an RF amplifier will decrease the ratio of ...
February 26Folded Unipole Antenna Impedance A folded unipole antenna is one-half of a folded dipole mounted vertically on ...
February 27Folded Unipole Antenna Bandwidth A folded unipole antenna has significantly wider bandwidth than an unfolded vertical radiator, because ...
February 28Folded Unipole Mounting Advantages It is necessary to insulate the bottom of a base-fed tower ...

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