| Date |
Fact of the Day Topic |
| December 1 |
Conductor Proximity Effect The current
distribution in a conductor is affected by magnetic flux produced by
current flowing in any adjacent ... |
| December 2 |
Audio Transformer Frequency Response The
low-frequency response of an audio transformer is down 3dB ... |
| December 3 |
Ohmmeter Battery Compensation Most ohmmeters
use one of two different methods to allow users to make ... |
| December 4 |
Induction and Radiation Fields There is
a mix of magnetic and electric induction fields and an electromagnetic
radiation field at distances ... |
| December 5 |
Broadside Array Gain The power gain of
a broadside array of antenna elements is almost exactly proportional
to ... |
| December 6 |
Nickel-Cadmium Battery Discharging Nickel-cadmium
(NiCd) batteries should be discharged to 1-volt per cell before they
are recharged to avoid ... |
| December 7 |
Nickel-Cadmium Battery Charging Nickel-cadmium
(NiCd) batteries can be recharged approximately 800 times over a period
of ... |
| December 8 |
Nickel-Metal-Hydride Batteries Nickel-metal-hydride
(NiMH) batteries have a useful life of about 400 charge/discharge cycles
if ... |
| December 9 |
Lithium-Ion Batteries Lithium-ion (Li-Ion)
batteries have twice the charge density of ... |
| December 10 |
Discount Lithium-Ion Batteries Beware
of purchasing lithium-ion batteries that are offered at exceptionally
low prices ... |
| December 11 |
Average Hearing Characteristics The average
hearing characteristics of a large number of people were first determined
by ... |
| December 12 |
Lightning Characteristics Most lightning
strikes are associated with rain storms, but lightning strike risk is
not ... |
| December 13 |
Ground Rod Resistance Measurement The
resistance between two ground rods spaced farther apart than ... |
| December 14 |
Three Phase Power The current in leg B
lags the current in leg A 120 degrees (1/3 cycle) and the current ... |
| December 15 |
AC Power Baluns AC power is distributed
to North American residences using a three-line circuit consisting of
... |
| December 16 |
Non-Linear AC Loads RF interference conducted-by
and radiated-from AC power lines plagues most everyone interested in
... |
| December 17 |
Adcock Antennas Small, perfectly-balanced
vertical loop antennas are useful for ... |
| December 18 |
Dipole Arrays with Reflectors Dipole arrays
backed by tuned reflectors are very difficult to tune, because ... |
| December 19 |
Dipole Radiated Field Intensity The maximum
field intensity from a half-wave dipole radiating 1,000 watts is ... |
| December 20 |
Tuning Inductor-Input Filters Inductor-input
power supply filter effectiveness can be increased by connecting a ... |
| December 21 |
Virtually-Pure Horizontal Polarization Some
applications, such as certain types of radio navigational aids, require
antennas ... |
| December 22 |
Superconductors Superconductors conduct
electric current without energy loss, because ... |
| December 23 |
Surface Mount Technology Open most any
modern electronic equipment and you will find ... |
| December 24 |
RoHS After July 2006 the European Union
(EU) Directive on the Restriction of certain Hazardous Substances ... |
| December 25 |
Fiber Optics Technology Fiber optic technology
provides a method to transmit information from one place to another that
is ... |
| December 26 |
Fiber Optics Transmission Distance Several
factors control the distance information can be transmitted down a fiber
optics line ... |
| December 27 |
Fiber Optic Cable Types There are two
fundamental types of fiber optic cable, singlemode and multimode ... |
| December 28 |
Rhombic Antennas Rhombic antennas used
to be very popular shortwave broadcast antennas, because ... |
| December 29 |
Phase-Shift Networks There are two fundamentally
different types of variable phase-shift networks. One type ... |
| December 30 |
Parasitic Oscillations Spurious parasitic
oscillation usually is caused by regeneration in ... |
| December 31 |
NE-2 Lightning Protection Sometimes NE-2
neon lamps are used on receiving antennas to provide protection from
... |
