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Precision Software Appli…tions Silver Collection 1
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Precision Software Applications Silver Collection Volume One (PSM) (1993).iso
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arsg10.exe
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ARSGDAT.3BI
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1992-10-04
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8KB
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336 lines
;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
; :
; AMATEUR RADIO STUDY GUIDE v1.00 :
; :
; Copyright (c) 1992 David Drzyzga - All Rights Reserved :
; :
; Based on a program coded in BASIC by Russ Revels :
; :
;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
;
; You can include comments an the file anywhere you want
; just like these comments. You cannot put a comment in
; the middle of a line though.
;
; When modifying this file, there are several things you
; must be aware of:
;
; -> Any line of text in this file cannot exceed 65 characters!
; this is the 65th character^
;
; No harm will be done, but nothing over 65 characters will
; be read by the program.
;
; -> Do not make questions more than 20 lines long, or you
; will receive an 'out of memory' error when you execute
; the program.
;
; -> You can add or delete questions as you please, just be
; sure to follow the format of the existing questions.
;
;
;
(3BI-1.3)
Why is a Yagi antenna often used for radiocommunications on the
20 meter band?
C. It discriminates against interference from other stations off
to the side or behind
*
(3BI-1.7)
What method is best suited to match an unbalanced coaxial feed
line to a Yagi antenna?
D. Gamma match
*
(3BI-1.9)
How can the bandwidth of a parasitic beam antenna be increased?
A. Use larger diameter elements
*
(3BI-2.1)
How much gain over a half-wave dipole can a two-element cubical
quad antenna provide?
C. Approximately 6 dB
*
(3BI-3.1)
How long is each side of a cubical quad antenna driven element
for 21.4-MHz?
B. 11.7 feet
*
(3BI-3.2)
How long is each side of a cubical quad antenna driven element
for 14.3-MHz?
B. 17.6 feet
*
(3BI-3.3)
How long is each side of a cubical quad antenna reflector
element for 29.6-MHz?
B. 8.7 feet
*
(3BI-3.4)
How long is each leg of a symmetrical delta loop antenna driven
element for 28.7-MHz?
C. 11.7 feet
*
(3BI-3.5)
How long is each leg of a symmetrical delta loop antenna driven
element for 24.9-MHz?
C. 13.45 feet
*
(3BI-3.6)
How long is each leg of a symmetrical delta loop antenna
reflector element for 14.1-MHz?
C. 24.35 feet
*
(3BI-3.7)
How long is the driven element of a Yagi antenna for 14.0-MHz?
B. Approximately 33 feet
*
(3BI-3.8)
How long is the director element of a Yagi antenna for 21.1-MHz?
B. Approximately 21 feet
*
(3BI-3.9)
How long is the reflector element of a Yagi antenna for
28.1-MHz?
C. Approximately 17.5 feet
*
(3BI-5.1)
What is the feed-point impedance for a half-wavelength dipole HF
antenna suspended horizontally one-quarter wavelength or more
above the ground?
D. Approximately 73 ohms, resistive
*
(3BI-5.2)
What is the feed-point impedance of a quarter-wavelength
vertical HF antenna with a horizontal ground plane?
B. Approximately 36 ohms
*
(3BI-5.3)
What is an advantage of downward sloping radials on a
ground-plane antenna?
D. Sloping the radials downward brings the feed-point impedance
closer to 50 ohms
*
(3BI-5.4)
What happens to the feed-point impedance of a ground-plane
antenna when the radials slope downward from the base of the
antenna?
B. The feed-point impedance increases
*
(3BI-6.1)
Compared to a dipole antenna, what are the directional radiation
characteristics of a cubical quad HF antenna?
C. The quad has more directivity in both horizontal and vertical
planes
*
(3BI-6.2)
What is the radiation pattern of an ideal half-wavelength dipole
HF antenna?
A. If it is installed parallel to the earth, it radiates well in
a figure-eight pattern at right angles to the antenna wire
*
(3BI-6.3)
How does proximity to the ground affect the radiation pattern of
a horizontal dipole HF antenna?
B. If the antenna is less than one-half wavelength from the
ground, reflected radio waves from the ground distort the
radiation pattern of the antenna
*
(3BI-6.4)
What does the term antenna front-to-back ratio mean?
C. The power radiated in the major radiation lobe compared to
the power radiated in exactly the opposite direction
*
(3BI-6.5)
What effect upon the radiation pattern of an HF dipole antenna
will a slightly smaller parasitic parallel element located a few
feet away in the same horizontal plane have?
D. If the spacing is greater than 0.1 wavelength, a major lobe
will develop in the horizontal plane to the side of the driven
element toward the parasitic element
*
(3BI-6.6)
What is the meaning of the term main lobe as used in reference
to a directional antenna?
C. The direction of maximum radiated field strength from a
radiating antenna
*
(3BI-7.1)
Upon what does the characteristic impedance of a
parallel-conductor antenna feed line depend?
A. The distance between the centers of the conductors and the
radius of the conductors
*
(3BI-7.2)
What is the characteristic impedance of various coaxial cables
commonly used for antenna feed lines at amateur stations?
B. Around 50 and 75 ohms
*
(3BI-7.3)
What effect, if any, does the length of a coaxial cable have
upon its characteristic impedance?
A. The length has no effect on the characteristic impedance
*
(3BI-7.4)
What is the characteristic impedance of flat-ribbon TV-type
twinlead?
D. 300 ohms
*
(3BI-8.4)
What is the cause of power being reflected back down an antenna
feed line?
C. A difference between feed line impedance and antenna
feed-point impedance
*
(3BI-9.3)
What will be the standing wave ratio when a 50 ohm feed line is
connected to a resonant antenna having a 200 ohm feed-point
impedance?
A. 4:1
*
(3BI-9.4)
What will be the standing wave ratio when a 50 ohm feed line is
connected to a resonant antenna having a 10 ohm feed-point
impedance?
D. 5:1
*
(3BI-9.5)
What will be the standing wave ratio when a 50 ohm feed line is
connected to a resonant antenna having a 50 ohm feed-point
impedance?
C. 1:1
*
(3BI-11.1)
How does the characteristic impedance of a coaxial cable affect
the amount of attenuation to the RF signal passing through it?
C. The attenuation related to the characteristic impedance is
about the same at all amateur frequencies below 1.5 GHz
*
(3BI-11.2)
How does the amount of attenuation to a 2 meter signal passing
through a coaxial cable differ from that to a 160 meter signal?
A. The attenuation is greater at 2 meters
*
(3BI-11.4)
What is the effect on its attenuation when flat-ribbon TV-type
twinlead is wet?
D. Attenuation increases
*
(3BI-11.7)
Why might silicone grease or automotive car wax be applied to
flat-ribbon TV-type twinlead?
B. To reduce the buildup of dirt and moisture on the feed line
*
(3BI-11.8)
In what values are RF feed line losses usually expressed?
D. dB/100 ft
*
(3BI-11.10)
As the operating frequency increases, what happens to the
dielectric losses in a feed line?
D. The losses increase
*
(3BI-11.12)
As the operating frequency decreases, what happens to the
dielectric losses in a feed line?
A. The losses decrease
*
(3BI-12.1)
What condition must be satisfied to prevent standing waves of
voltage and current on an antenna feed line?
D. The antenna feed-point impedance must be matched to the
characteristic impedance of the feed line
*
(3BI-12.2)
How is an inductively-coupled matching network used in an
antenna system consisting of a center-fed resonant dipole and
coaxial feed line?
A. An inductively coupled matching network is not normally used
in a resonant antenna system
*
(3BI-12.5)
What is an antenna-transmission line mismatch?
D. A condition where the characteristic impedance of the feed
line does not equal the feed-point impedance of the antenna
*