All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers
- particularly those who are fresh out of school or are relatively new to the work world. Come to
think of it, they would make equally excellent study material for the same persons who are going to
be interviewed for a job.
Some of these books used in quizzes are available as prizes
in the monthly RF Cafe Giveaway.
Note: Many answers contain passages quoted in whole or in part from the text.
quiz is based on the information presented in Multi-Gigabit Microwave and Millimeter-Wave Wireless Communications,
by Jonathan Wells. Artech House is the
1. Which entity is the primary regulatory agency in the world with
responsibility for coordinating
shared global use of the radio spectrum?
a) WWR (World Wide Radio)
b) GCU (Global Communications Union)
c) URU (Universal Radio Union)
d) ITU (International
2. What is a primary obstacle to FSO (Free Space
Optics) terrestrial usage?
a) Very high attenuation
b) Nighttime-only operation
generating the light
d) FM radio interference
3. Which condition causes
the least amount of attenuation on electromagnetic signals?
a) Moist air
b) Dry air
c) High wind
d) Low wind
4. What is the equation for determining attenuation factor
(specific attenuation) due to snow and ice?
(R=snowfall rate in mm/hr, λ=wavelength in mm)
Attenuation Factor = λ/R
b) Attenuation Factor = λ/R2
c) Attenuation Factor = λ/R3
d) Attenuation Factor = [(0.00349*R1.6)/λ4] + [(0.00224*R)/λ]
What is the equation for determining attenuation due to foliage?
(f=frequency in MHz, R=depth of foliage
a) Loss = 10 log (f2R)
b) Loss = 20 log (fR)
c) Loss = 20R log (f)
d) Loss = 0.2f0.3R0.6
6. What is a primary feature of a plesiochronous digital hierarchy (PDH) system?
a) Running in a state where different parts of the network are nearly,
but not quite perfectly,
b) Having features discovered in the Plesioic era
c) Operating in an orthogonally
d) Using a deterministic hierarchy
What does the image to the right depict?
a) An NTSC test signal for CATV
b) 256 QAM with phase noise
c) The whirlpool constellation
d) RF astigmatism
8. Which frequencies in the 60 GHz band are allocated by the FCC for unlicensed use?
a) 57 to 64 GHz
b) Only at 60 GHz
c) 71 to 74 GHz
d) There are no unlicensed bands at 60 GHz
9. What is a link budget?
a) The cost of a communications system
b) The total link count in
a communications system
c) A fictitious number representing system performance
d) An accounting of all
gains and losses in a communications system
10. Which city would likely have higher 23 GHz system availability due to
a) Riyadh, Saudi Arabia
b) New Your City, USA
c) Sydney, Australia
d) Singapore, Singapore
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answers and explanations.