| Date |
Fact of the Day Topic |
| January 1 |
Waveguide Connections A very satisfactory
low-loss connection can be made between two waveguides by ... |
| January 2 |
Waveguide Attenuation Waveguides can support
traveling waves at frequencies higher than their ... |
| January 3 |
Electron Facts Electrons are the obvious
basis of everything electronic. Electric voltage, electric current ... |
| January 4 |
Incandescent Lamp Life Miniature and subminiature
incandescent lamps are widely used as status indicators and to ... |
| January 5 |
Microphone Directivity All microphones respond
primarily to changes in air pressure or air velocity, but not to ... |
| January 6 |
Aurora Color Significance The most commonly
seen aurora color is brilliant yellow-green which is produced when ... |
| January 7 |
Meaning of 'Aurora Borealis' Red is the
most common color of auroras seen in Italy where the scientist ... |
| January 8 |
Ionospheric Wave Split The earth's magnetic
field can cause the ionosphere to have two refractive indexes, so that
... |
| January 9 |
Loop Antenna Shape It often is said that
loop antennas should enclose the greatest possible area and that ... |
| January 10 |
LED Advantages Light Emitting Diodes (LED's)
have many advantages compared to incandescent lamps. They are ... |
| January 11 |
Surge Protectors A variety of devices used
to limit power-line voltage surges can be classified as surge protectors
... |
| January 12 |
Service Entrance Surge Protection Electric
service entrance surge protection is important both to human safety and
to ... |
| January 13 |
Point-of-Use Surge Protectors A point-of-use
surge protector should protect each item of ... |
| January 14 |
Lightning Surge Transmission Modes Most
homes have three incoming power lines. One is grounded (usually at both
ends) ... |
| January 15 |
Metal Oxide Varistors Most surge protectors
installed inside homes are a type known as Transient ... |
| January 16 |
Visible Clouds in the Ionosphere? Lumpy
clouds of ionized gas in the ionosphere often return radio signals to
earth. The returned ... |
| January 17 |
Temperature vs. Reliability Electronic
equipment life is directly related to operating temperature according
to the Arrhenius function ... |
| January 18 |
Why Copper Ground Rods? 'Copper ground
rods' actually are copper clad steel, because copper rods would be too
... |
| January 19 |
Graphite Ground Enhancement Some people
recommend mixing graphite with the soil surrounding copper ground ... |
| January 20 |
Lithium Polymer Batteries Lithium polymer
(Li-Poly) batteries are the latest and greatest batteries for cell phones
... |
| January 21 |
Maximizing Battery Performance The most
common reason for poor rechargeable battery performance is ... |
| January 22 |
Solar Flares Solar flares are incredibly
powerful solar explosions that release a force equal to ... |
| January 23 |
Sporadic-E Reflections The large volume
of sporadic-E ionospheric communications logged by ... |
| January 24 |
Electrostatic Breakdown The 'static' part
of the term 'electrostatic' implies an electric field that doesn't ... |
| January 25 |
Human RF Radiation Risks Radiant RF energy
is non-ionizing and is believed to not have cumulatively damaging ... |
| January 26 |
Misuse of 'Electrostatic' It is common
for Amateur Radio literature and even some scholarly papers written by
PhD's to state that ... |
| January 27 |
Broken Safety Grounds Electric power outlet
safety grounds (also called equipment grounds) generally return to ... |
| January 28 |
RF Amplifier Impedance Matching It often
has been written and most people seem to believe that the output impedance
... |
| January 29 |
Suitability of Electrical Insulating Materials Both
electrical engineers and radio amateurs tend to focus on ... |
| January 30 |
Ground Plane Radials The number of ground
plane antenna radials needed for efficient operation depends on ... |
| January 31 |
WWV Time Standard In 1999 National Institute
of Standards station WWV in Fort Collins, Colorado, began using a new
... |
