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March Fact-of-the-Day Index

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DateFact of the Day Topic
March 1LF & MF Nondirectional Radio Beacons The first nondirectional radio beacon (NDB) was placed in service in 1921. It was ...
March 2Forward-Scatter Antenna Considerations Ionospheric forward-scatter propagation makes communication possible beyond ...
March 3Tesla's Radio-Controlled Boat On May 18, 1899, Nikola Tesla demonstrated a six-foot-long radio-controlled boat to ...
March 4Antenna Loading Capacitors It is well known that a loading coil can be connected in series with a short antenna to ...
March 5Guy Insulator Capacitance It is well known that antenna tower metallic guy cables should be separated into ...
March 6Removing Copper Antenna Tarnish Copper tubing or large-diameter bare copper wire is sometimes used to ...
March 7Lead-Free Solder An EU directive restricts the use of certain hazardous substances, including lead, in ...
March 8Mathematical Meaning of 'Normal' Familiarity with common meanings of the word 'normal,' such as 'being approximately ...
March 93860 kHz Interference If you hear a rough-sounding and very broad signal centered at 3860 kHz there is a high probability that ...
March 10Three Radio Direction-Finding Methods A wide variety of radio direction-finding systems have been developed employing ...
March 11Doppler-Shift Radio Direction Finding Radio amateurs most often use the directional characteristics of antennas to find bearings ...
March 12Quasi-Doppler-Shift Radio Direction Finders Servo Corporation of America patented Quasi-Doppler-Shift Radio Direction Finders ...
March 13Piezoelectric Crystals Quartz is used almost exclusively to produce frequency-control crystals, because of its ...
March 14Linear Circuits Any circuit that has a ratio of output-signal to input-signal (called a transfer function) that is not ...
March 15Nonlinear Circuits A nonlinear circuit has a ratio of output-signal to input-signal (a transfer function) that is a function of ...
March 16Is an Unmodulated Carrier a Carrier? Ask a radio engineer what a carrier is and you probably will be told that a carrier is a ...
March 17Transmitting Complex Sounds Most common sounds are complex mixtures of multiple frequencies having ...
March 18Phase & Frequency Modulation Difference It is impossible to change the phase of a sinewave without changing its frequency ...
March 19Mathematical Meaning of Root Lack of knowledge of the simple meanings of common technical terms can make relatively simple ideas ...
March 20Measuring Tree Branch Height Trees often support the ends of wire antennas. Regardless of whether a tree is climbed ...
March 21Battery Storage Temperature Batteries deteriorate at various rates continuously from the time they are manufactured ...
March 22Battery Self-Discharge All chemical batteries self-discharge, but self-discharge rates tend to be higher with ...
March 23Computer Memory Leaks Computer programs request blocks of memory from a computer operating system such as ...
March 24Computer General Protection Faults Computer operating systems allocate blocks of memory space and certain other resources ...
March 25Meaning of 'Field' The term 'field' is very familiar to everyone who has studied technical aspects of radio. Beginners read about ...
March 26NiCd Battery Crystalline Formation Newly manufactured NiCd battery cells contain finely-divided crystals of ...
March 27Li-Ion Battery Overcharge Danger Lithium-Ion (Li-Ion) batteries are different than most types of rechargeable batteries in that ...
March 28Twisted-Pair Balun Wire Two-wire speaker cable, hand-twisted enamel wires, and other wire pairs with unknown ...
March 29Sound Noise-Masking Experiments Egan and Hake conducted a series of sound-signal noise-masking experiments in ...
March 30Rocket-Triggered Lightning It is necessary to observe lightning at close range to accurately investigate some of the associated ...
March 31Best Place to Stop Interference Where possible, the best place to stop interference is generally at its source. The reason is simple ...

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