November 1953 QST
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
from
QST, published December 1915 - present (visit ARRL
for info). All copyrights hereby acknowledged.
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QST magazine occasionally used
to run a feature titled "Quist Quiz" that was a short test of knowledge in the areas
of antennas, impedance matching, amplifier biasing, etc. I'm not sure where the
"Quist" part of the title comes from. A guess about it possibly being the last name
of the author could not be confirmed or ruled out based on a quick Internet search.
The only definition I could find for 'quist' is one meaning a wooden pigeon. If
anyone knows the origin of "Quist," please let me know.
Update: RF Cafe visitor Paul Sexauer suggests that 'quist' should be pronounced
'kist,' as in 'quiche.' Doing so gives the phonetic enunciation of 'qst.' I wrongly
assumed it to be 'kwist,' as in 'kween' for 'queen.'
Quist Quiz
The new 20-meter beam that A built will require
a 200-foot feed line into the shack. Finding that the loss in 200 feet of RG-8/U
coaxial cable would be 1.25 db. for the matched condition, A has been considering
the use of an open-wire line. His friend B advises him against it, saying that although
the theoretical loss in 200 feet of open-wire line would be only 0.15 db., the actual
loss through radiation from the line would equal or exceed the loss in the coaxial
line. Which feed line is better, and why?
Answer below ...
Quizzes from vintage electronics magazines such as Popular
Electronics, Electronics-World, QST, and Radio News were published
over the years - some really simple and others not so simple. Robert P. Balin
created most of the quizzes for Popular Electronics. This is a listing
of all I have posted thus far.
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-
Elementary
Radio Quiz - December 1947 Radio-Craft
- Hi-Fi
Quiz - October 1955 Radio & Television News
- Electronics Physics
Quiz - March 1974 Popular Electronics
- A Baffling Quiz
- January 1968 Popular Electronics
- Electronics IQ
Quiz - May 1967 Popular Electronics
- Plug and Jack
Quiz - December 1967 Popular Electronics
- Electronic
Switching Quiz - October 1967 Popular Electronics
- Electronic
Angle Quiz - September 1967 Popular Electronics
- International
Electronics Quiz - July 1967 Popular Electronics
- FM Radio
Quiz - April 1950 Radio & Television News
- Bridge Circuit
Quiz -December 1966 Popular Electronics
- Diode Function
Quiz - August 1965 Popular Electronics
- Diagram Quiz,
August 1966 Popular Electronics
- Quist Quiz - November
1953 QST
- TV Trouble Quiz,
July 1966 Popular Electronics
- Electronics History Quiz,
December 1965 Popular Electronics
- Scope-Trace Quiz,
March 1965 Popular Electronics
-
Electronic
Circuit Analogy Quiz, April 1973
-
Test Your Knowledge of Semiconductors, August 1972 Popular Electronics
- Ganged Switching
Quiz, April 1972 Popular Electronics
- Lamp Brightness
Quiz, January 1969 Popular Electronics
- Lissajous Pattern Quiz, September 1963 Popular Electronics
- Electronic
Quizoo, October 1962 Popular Electronics
- Electronic Photo Album Quiz, March 1963 Popular Electronics
- Electronic Alphabet Quiz, May 1963 Popular Electronics
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960 Popular Electronics
- Vector-Circuit Matching Quiz, June 1970 Popular Electronics
- Inductance
Quiz, September 1961 Popular Electronics
- RC Circuit Quiz,
June 1963 Popular Electronics
- Diode Quiz, July
1961 Popular Electronics
- Electronic Curves Quiz, February 1963 Popular Electronics
- Electronic Numbers Quiz, December 1962 Popular Electronics
- Energy Conversion Quiz, April 1963 Popular Electronics
- Coil Function
Quiz, June 1962 Popular Electronics
-
Co-Inventors Quiz - January 1965 Electronics World
-
"-Tron" Teasers Quiz - October 1963 Electronics World
- Polarity Quiz
- March 1968 Popular Electronics
-
Television
I.Q. Quiz - October 1948 Radio & Television News
- Amplifier Quiz
Part I - February 1964 Popular Electronics
- Semiconductor
Quiz - February 1967 Popular Electronics
- Unknown
Frequency Quiz - September 1965 Popular Electronics
- Electronics
Metals Quiz - October 1964 Popular Electronics
- Electronics
Measurement Quiz - August 1967 Popular Electronics
- Meter-Reading
Quiz, June 1966 Popular Electronics
- Electronic
Geometry Quiz, January 1965 Popular Electronics
- Electronic
Factor Quiz, November 1966 Popular Electronics
- Electronics
Math Quiz, November 1965 Popular Electronics
- Series Circuit
Quiz, May 1966 Popular Electronics
- Electrochemistry
Quiz, March 1966 Popular Electronics
- Biz
Quiz: Test Your Sales Ability - April 1947 Radio News
- Electronic
Analogy Quiz, November 1961 Popular Electronics
- Electronic
Coupling Quiz, August 1973 Popular Electronics
- Electronics Analogy Quiz, August 1960 Popular Electronics
- Audio Quiz, April
1955 Popular Electronics
- Electronic Unit
Quiz, May 1962 Popular Electronics
- Capacitor
Circuit Quiz, June 1968 Popular Electronics
- Quiz on AC Circuit Theory, December 1970 Popular Electronics
- Magnetic Phenomena Quiz, February 1962 Popular Electronics
- Electronics Geography Quiz, April 1970 Popular Electronics
- Electronic
Menu Quiz, August 1963 Popular Electronics
- Electronic Noise Quiz, August 1962 Popular Electronics
- Electronic Current Quiz, October 1963 Popular Electronics
- Electronic Inventors Quiz, November 1963 Popular Electronics
- Resistor Function
Quiz, January 1962 Popular Electronics
- Electronic Measurement Quiz, January 1963 Popular Electronics
- Vacuum Tube Quiz,
February 1961 Popular Electronics
- Kool-Keeping Kwiz, June
1970 Popular Electronics
- Find the Brightest
Bulb Quiz, April 1960 Popular Electronics
-
Where Do the Scientists Belong? - Feb 19, 1949 Saturday Evening
Post
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ANSWER
B is wrong about the radiation loss from open-wire line - it is an insignificant
factor except when the line spacing s an appreciable fraction of the wavelength.
Even the line unbalance introduced by running around corners or not maintaining
symmetry with respect to ground does not result in any greatly increased radiation
from the line. On a strict attenuation basis, therefore, the open-wire is better,
and would show about 1 db. less loss than the coaxial line. For mechanical reasons,
however, the coaxial line might be preferable.
The entire feed line (open-wire or coaxial) may radiate if it is unsymmetrically
coupled to an antenna and is of such a length that is becomes a part of the radiating
system. Typical examples of this are the Zepp, center-fed antennas in which the
feed line does not come away at right angles, and the off-center-fed-with-300-ohm-line
antennas.
My own approach is to point out that the transmissions line which introduces
the least amount loss over a given length (200 feet) will dissipate less of the
signal whether through heat, radiation, or a combination thereof. Hence, the 0.15
dB open line is the better choice that the 1.25 dB coaxial cable from that consideration
alone.
Posted October 6, 2016
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