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October Fact-of-the-Day Index

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DateFact of the Day Topic
October 1Tower Guy Load Load in tower guys depends on the guying arrangement used, the direction of the wind, the amplitudes of ...
October 2Tower Base Foundations Concrete piers generally make the best tower base foundations. Safe foundations must be ...
October 3Tower Column Load Antenna tower column load sometimes is underestimated by amateur designers. Static tower column load is the sum of ...
October 4Modulation An unmodulated carrier is a constant amplitude, single-frequency, sinusoidal wave. A carrier wave must be ...
October 5FM Signal Bandwidth The bandwidth of a frequency modulated signal can be calculated using Bessel functions. Bessel functions show that ...
October 6Receiving Bandwidth Effects The effects of restricting receiving bandwidths are different for ...
October 7VHF Radiation Above the Horizon Most VHF communication utilizes direct waves rather than sky waves ...
October 8Antenna Effective Aperture The effective aperture of an antenna is sometimes called its capture area. It is the frontal area from which ...
October 9Receiver Noise Figures The importance of receiver noise figures tend be very different depending on ...
October 10Knife-Edge Bending Laboratory experiments demonstrated long ago that light rays are refracted (bent) when ...
October 11Lightning Flashes Lightning flashes usually consist of 3 or 4 individual discharges called strokes. The individual strokes ...
October 12Determining Coil Distributed Capacitance The distributed capacitance of a coil can be determined by ...
October 13VHF Long-Wires, V-Beams and Rhombics Long-wires, v-beams and rhombics are rarely used in VHF and UHF applications, mostly because ...
October 14White Noise The power spectrum of white noise is frequency-independent. Noise with a flat power spectrum ...
October 15Feed-Line Irregularities Feed-line irregularities result wherever line constants change due to ...
October 16Cross-Modulation Cross-modulation is a condition where the amplitude of a signal of one frequency is affected by ...
October 17Transformer Current Inrush AC power may happen to be applied to the primary winding of a power transformer at any point in the voltage cycle ...
October 18Audio Frequency Response Many years ago broadcast engineers determined in exhaustive experimental tests with juries of listeners that ...
October 19Electron Velocity in Volts Beginning electronics students often are puzzled when they find the velocity of electrons expressed in volts ...
October 20Propagation Below 100 kHz At frequencies below 100 kHz radio waves that have traveled a great distance act as though they ...
October 21Tower Lighting The governments of most countries require warning lights on all high towers and on low towers near ...
October 22Emergency Power Generators Gasoline is expensive, difficult to transport, dangerous to store, and deteriorates ...
October 23Semiconductor Hole Storage Holes injected across a semiconductor junction interface from a P-region into an N-region are capable of ...
October 24Matching the Impedance of Space Maximum power transfer from a line to a load occurs when ...
October 25Tower Galvanizing Galvanizing is a name given to the process of coating a metal with a different metal. The most common ...
October 26Subsurface Antennas Subsurface (buried or submerged) antennas have obvious military and espionage ...
October 27Luxemburg Effect The action of the ionosphere upon an electromagnetic wave is, at least in theory, ...
October 28Electrically-Conducting Shields Both electrostatic and magnetic radio-frequency fields can be confined to small spaces by ...
October 29Magnetic Shields Non-magnetic, electrically-conducting shields are not effective in shielding ...
October 30Antenna Phase Shifters It is common practice to shift the relative phase and to adjust the ...
October 31Broadside Array Gain The power gain of uniformly-spaced broadside arrays with lengths greater than ...

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