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