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About RF Cafe
1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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May 1963 Popular ElectronicsTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.
This quiz from Popular Electronics is a bit trickier than others because it requires you to think abstractly rather than concretely. Quiz-maker Robert Balin presents a series of circuits and components along with the first letters of the related topics. Your mission, should you decide to accept, is to match the item to the letter. The example provided is matching the letter 'J' to a drawing of that type of half-wave antenna. I have to admit that my attempt at matching all of the items and letters was taking a lot of time, so I quit before finishing all of them; my hard head is better at concrete thinking.
Electronic Alphabet QuizBy Robert P. Balin
The letters of the alphabet are often used as abbreviations for electronic terms. Thus, J means to the electronics enthusiast a type of half-wave antenna. Can you match the letters below with the drawings (1-10) of the devices and circuits to which they most logically refer?
|Here are other Popular Electronics quizzes:|
- Lamp Brightness Quiz, January
Alphabet Quiz Answers
A - 8 Class A amplifiers use a biasing level which permits
plate current to flow continuously when an
a.c. signal is applied to the grid.
B - 3 The B battery is used to supply the plate voltage for battery-operated tubes.
C - 9 Operating temperatures for electronic devices
are often given in degrees celsius (°C), formerly
known as the centigrade scale.
E - 7 The E layer of the ionosphere 50 - 90 miles up
provides daytime over-the-horizon short-wave
L - 10 An L section choke input filter is used in full-wave,
high-current power supplies such as those
employing mercury vapor rectifiers.
Q - 1 The Q of a coil is a figure of merit representing the ratio of its reactance to resistance at a specific frequency.
S - 5 An S-meter is a relative signal strength indicator
on radio receivers, calibrated in "S" units from 0 - 9,
and in db above S-9.
X - 2 X-ray radiation is produced in a Roentgen tube when a high-velocity electron beam strikes a tungsten target.
Y - 6 The Y connection of transformer secondary windings
provides three-phase power in which the line-to-line
voltage equals 1.732 times the line-to-ground voltage.
Z - 4 The Z-axis input of an oscilloscope permits intensity
modulation of the electron beam by applying the
signal to the grid-cathode circuit.
Posted June 25, 2014