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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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tutor
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arsg10.exe
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ARSGDAT.2AI
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Text File
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1992-10-04
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8KB
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320 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.
;
;
;
(2AI-1.1)
What is the approximate length (in feet) of a half-wavelength
dipole antenna for 3725 kHz?
A. 126 ft
*
(2AI-1.2)
What is the approximate length (in feet) of a half-wavelength
dipole antenna for 7125 kHz?
D. 66 ft
*
(2AI-1.3)
What is the approximate length (in feet) of a half-wavelength
dipole antenna for 21,125 kHz?
C. 22 ft
*
(2AI-1.4)
What is the approximate length (in feet) of a half-wavelength
dipole antenna for 28,150 kHz?
C. 17 ft
*
(2AI-1.5)
How is the approximate length (in feet) of a half-wavelength
dipole antenna calculated?
D. By substituting the desired operating frequency for f in the
formula: 468 / f (in MHz)
*
(2AI-2.1)
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 3725 kHz?
D. 63 ft
*
(2AI-2.2)
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 7125 kHz?
D. 33 ft
*
(2AI-2.3)
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 21,125 kHz?
B. 11 ft
*
(2AI-2.4)
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 28,150 kHz?
B. 8 ft
*
(2AI-2.5)
When a vertical antenna is lengthened, what happens to its
resonant frequency?
A. It decreases
*
(2AI-3.1)
Why do many amateurs use a 5/8-wavelength vertical antenna
rather than a 1/4-wavelength vertical antenna for their VHF or
UHF mobile stations?
B. A 5/8-wavelength antenna has more gain than a 1/4-wavelength
antenna
*
(2AI-3.2)
What type of radiation pattern is produced by a 5/8-wavelength
vertical antenna?
C. A pattern with the transmitted signal going equally in all
compass directions, with most of the radiation going close to
the horizon
*
(2AI-4-1.1)
What type of antenna produces a radiation pattern with more of
the transmitted signal concentrated in a particular direction
than in other directions?
D. A beam antenna
*
(2AI-4-1.2)
What type of radiation pattern is produced by a Yagi antenna?
B. A pattern with more of the transmitted signal concentrated in
one direction than in other directions
*
(2AI-4-1.3)
Approximately how long (in wavelengths) is the driven element of
a Yagi antenna?
C. 1/2 wavelength
*
(2AI-4-2.1)
On the Yagi antenna shown in Figure 2I-4, what is the name of
section B?
D. Driven element
*
(2AI-4-2.2)
On the Yagi antenna shown in Figure 2I-4, what is the name of
section C?
A. Director
*
(2AI-4-2.3)
On the Yagi antenna shown in Figure 2I-4, what is the name of
section A?
B. Reflector
*
(2AI-4-2.4)
What are the names of the elements in a 3-element Yagi antenna?
A. Reflector, driven element and director
*
(2AI-5.1)
How should the antenna on a hand-held transceiver be positioned
while you are transmitting?
A. Away from your head and away from others standing nearby
*
(2AI-5.2)
Why should you always locate your antennas so that no one can
come in contact with them while you are transmitting?
B. To prevent RF burns and excessive exposure to RF energy
*
(2AI-5.3)
You are going to purchase a new antenna for your VHF or UHF
hand-held radio. Which type of antenna is the best choice to
produce a radiation pattern that will be least hazardous to your
face and eyes?
C. A 1/2-wavelength whip
*
(2AI-6.1)
What is a coaxial cable?
D. A center conductor encased in insulating material which is
covered by a conducting sleeve or shield
*
(2AI-6.2)
What kind of antenna feed line is constructed of a center
conductor encased in insulation which is then covered by an
outer conducting shield and weatherproof jacket?
B. Coaxial cable
*
(2AI-6.3)
What are some advantages of using coaxial cable as an antenna
feed line?
B. It is weatherproof, and it has a characteristic impedance in
the range of most common amateur antennas
*
(2AI-6.4)
What commonly-available antenna feed line can be buried directly
in the ground for some distance without adverse effects?
B. Coaxial cable
*
(2AI-6.5)
When an antenna feed line must be located near grounded metal
objects, which commonly-available feed line should be used?
C. Coaxial cable
*
(2AI-7.1)
What is parallel-conductor feed line?
B. Two parallel conductors held a uniform distance apart by
insulating material
*
(2AI-7.2)
How can TV-type twin lead be used as a feed line?
C. By installing an impedance-matching network between the
transmitter and feed line
*
(2AI-7.3)
What are some advantages of using parallel-conductor feed line?
D. It will operate at higher SWR than coaxial cable and it has
less loss than coaxial cable
*
(2AI-7.4)
What are some disadvantages of using parallel-conductor feed
line?
A. It is affected by nearby metallic objects, and it has a
characteristic impedance that is too high for direct connection
to most amateur transmitters
*
(2AI-7.5)
What kind of antenna feed line is constructed of two conductors
maintained a uniform distance apart by insulated spreaders?
B. Ladder-line open conductor line
*
(2AI-8.1)
A certain antenna has a feed-point impedance of 35 ohms. You
want to use a 50-ohm-impedance coaxial cable to feed this
antenna. What type of device will you need to connect between
the antenna and the feed line?
C. An impedance matching device
*
(2AI-8.2)
A certain antenna system has an impedance of 1000 ohms on one
band. What must you use to connect this antenna system to the
50-ohm output on your transmitter?
C. An impedance matching device
*
(2AI-9.1)
The word balun is a contraction for what phrase?
D. Balanced to unbalanced
*
(2AI-9.2)
Where would you install a balun if you wanted to feed your
dipole antenna with 75-ohm parallel-conductor feed line?
A. At the transmitter end of the feed line
*
(2AI-9.3)
Where might you install a balun if you wanted to feed your
dipole antenna with 50-ohm coaxial cable?
A. You might install a balun at the antenna feed point
*
(2AI-10-1.1)
A four-element Yagi antenna is mounted with its elements
parallel to the ground. A signal produced by this antenna will
have what type of polarization?
C. Horizontal polarization
*
(2AI-11-1.1)
A four-element Yagi antenna is mounted with its elements
perpendicular to the ground. A signal produced by this antenna
will have what type of polarization?
D. Vertical polarization
*