| Date |
Fact of the Day Topic |
| February 1 |
Grounding Steel Towers Steel towers obviously
should be grounded for lightning protection whether or not grounding
is needed for ... |
| February 2 |
Heat Shrink Tubing Heat shrinkable tubing
is widely used to insulate irregularly shaped objects, such as cable
spices, to ... |
| February 3 |
Rotary Switch Cleaning Corrosion tends to
build-up more on rotary switch contacts than on the contacts of most
other types of switches, because ... |
| February 4 |
Bandwidth and Impulse Noise There many types
of radio noise that can be classified various ways. Two common types
are ... |
| February 5 |
Noise Blanker Effectiveness A noise blanker
blocks signal processing in a receiver for the duration of each noise
pulse that ... |
| February 6 |
Decibels and Logarithms Most people seriously
interested in technical aspects of radio know that a decibel is one-tenth
of ... |
| February 7 |
Meaning of 'Harmonic' The term 'harmonic'
has several meanings in science and mathematics, some of which have little
or no obvious relationship ... |
| February 8 |
Antenna Sag Curve A flexible antenna wire
supported from two end points forms a catenary curve due to the pull
of gravity if ... |
| February 9 |
External Anode Tubes All vacuum tube elements
were encased in a tube in early designs. That practice continued for
most ... |
| February 10 |
Direction Finding Antennas A wide variety
of radio direction finding antennas have been developed, including ... |
| February 11 |
Direction Finding Antenna Size I.E.E. Journal,
1949, Vol. 96, Part III, p. 321, contains, what was at the time ... |
| February 12 |
R/C Integrators Most electronic textbooks
and handbooks have a section about 'R/C integrators.' A single-section
R/C integrator ... |
| February 13 |
R/C Differentiators Most electronic textbooks
and handbooks have a section about 'R/C differentiators.' A single-section
R/C differentiator ... |
| February 14 |
Maxwell's Four Equations In the 1870's
James Clerk Maxwell was able to put together four important equations
that govern ... |
| February 15 |
Trigonometry Trigonometry is fundamentally
a study of triangles. The primary focus is on six simple functions ... |
| February 16 |
Fractals A fractal is a shape that contains
an infinite amount of self-similar fine detail. Consider white noise,
for example ... |
| February 17 |
Calculus Calculus is fundamentally a study
of rates of change, but extends to much more. Rate of change information
... |
| February 18 |
External Cross-Modulation External cross-modulation
refers to conditions where two or more radio frequency signals ... |
| February 19 |
Linear Power Amplifier Distortion The most
important linear power amplifier characteristic is the relationship between
... |
| February 20 |
Antenna Capacity Tops A grounded (or low-impedance
base-fed) vertical antenna can be fitted with a capacity top (also called
a capacity hat) to ... |
| February 21 |
Resonant Wideband Antennas All resonant
antennas that have good performance over wide bands of frequencies have
... |
| February 22 |
HF Vacuum-Tube-Amplifier Parasitic Oscillations Vacuum-tube-amplifier
parasitic oscillations can be classed into ... |
| February 23 |
LF Vacuum-Tube-Amplifier Parasitic Oscillations An
unwanted oscillation below the normal operating frequency of an RF amplifier
is ... |
| February 24 |
Dynatron Parasitic Oscillations Resistive
loads make resonant oscillations die out sooner, because ... |
| February 25 |
Push-Pull Amplifier Harmonics A simple
tuned circuit at the output of an RF amplifier will decrease the ratio
of ... |
| February 26 |
Folded Unipole Antenna Impedance A folded
unipole antenna is one-half of a folded dipole mounted vertically on
... |
| February 27 |
Folded Unipole Antenna Bandwidth A folded
unipole antenna has significantly wider bandwidth than an unfolded vertical
radiator, because ... |
| February 28 |
Folded Unipole Mounting Advantages It is
necessary to insulate the bottom of a base-fed tower ... |
