ELEMENT IV
review
問題一覧
1
carry RF signals between a radio and antenna
2
ammeter
3
set of headphones
4
at the battery or engine block ground strap
5
the keypad of VFO knob
6
voltage and resistance
7
two non-harmonically related audio signal
8
all of the choices
9
frequency tolerance with respect to a range of temperature measured in PPM or parts per million
10
it is the ability of a receiver to distinguish between a signal and the desired
11
it is a measure of a receiver’s ability to reproduce very weak signals
12
a fuse or circuit breakers in series with the equipment
13
insulate the base of the tower to avoid lightning strikes
14
as far away from accessible areas possible
15
144.000 - 146.000 MHz
16
a loose connection in an antenna or a feed line
17
in series with the circuit
18
a measure of how well a load is matched to a transmission line
19
check your transmitter for off-frequency operation or spurious emissions
20
between the transmitter and the antenna
21
switch
22
all of the choices
23
contesting
24
say your call sign
25
begin your transmission with “priority” or “Emergency” followed by your call sign
26
wavelength in meters equals 300 divided by frequency in megahertz
27
the difference between the repeater’s transmit and receive frequencies
28
rosin-core solder
29
a directional antenna
30
it matches the antenna system impedance to the transceiver’s output impedance
31
a phenomenon in FM reception in which only the stronger of two signals at, or near , the same frequency will be
32
two-tone sine wave test
33
a pulse signal
34
frequency domain waveforms
35
all of the choices
36
all of the choices
37
initial deviation of a crystal or oscillator frequency as compared to the absolute at 25 deg. C
38
24.940 MHz
39
no one has priority access to frequencies, common courtesy should be a guide
40
connect all ground contacts to a single point
41
all of the choices
42
a capacitor in parallel
43
52.525 MHz
44
only where such communications directly relate to immediate safety of human life or protection of property
45
to permit ease of monitoring the transmit and receive frequencies when they are not the same
46
better precision for most uses
47
you receive reports of “hum” on your station’s transmitter signal
48
received signal strength
49
single sideband
50
131 feet
51
a probe used for analyzing and troubleshooting logical states
52
amplitude level and time duration
53
1 to 1
54
ensure that the circuit is not powered
55
1/2 wavelength at the operating frequency
56
when adjusting tuned circuits
57
band-reject filter
58
the alternator
59
the receiver RIT clarifier
60
an SWR meter
61
the 12-volt fuses
62
VHF, very high frequency range
63
a band-pass filter
64
computer
65
a center wire inside an insulting material covered by the metal sleeve or shield
66
a transmit-receive change-over switch
67
the relatively high frequency power oscillator allows the use of small, light weight and low-cost transformers in the switched-mode supply
68
2:01
69
be sure to turn off the transmitter and disconnect the feed line
70
for safety, hands-free operation
71
antenna
72
relay
73
a calibrated field-strength meter with a calibrated antenna
74
to ensure that dangerous voltages are removed if the cabinet is opened
75
the transceiver is set to different transmit and receive frequencies
76
RCA Phono
77
a unidirectional antenna
78
the radiation pattern of an antenna
79
50 ohm and 75 ohm
80
connect a high-pass filter to the transmitter output and low-pass filter to the antenna input of the television
81
1000
82
1/2 wavelength
83
the transceiver could use more current than 5 amps and a fire could occur
84
use a key-operated on/off switch in the main power line
85
several sets of charged batteries
86
it may cause splatter interference to other stations operating near its frequency
87
20 - 20,000 Hz
88
be sure no one can activate the transmitter
89
conduct the net on a clear frequency 3 to 5 kHz away from the regular net frequency
90
to set the audio level at which the transmitter activates
91
a monitoring oscilloscope
92
RF hot spots can occur in a station located above the ground floor of the equipment is grounded by a long ground wire
93
it will increase the output PEP
94
the socket’s wiring may not be adequate for the current being drawn by the transceiver
95
resonant frequency of an LC tank circuit
96
all of the choices
97
interference caused by the combining several signals in a non-linear device producing new unwanted frequencies
98
overloading of a receiver front-end by a strong off-channel signal causing a reduction in sensitivity
99
the transfer of the amplitude modulation of a strong unwanted carrier onto the wanted carrier caused by non-linearity in
100
an open circuit
問題一覧
1
carry RF signals between a radio and antenna
2
ammeter
3
set of headphones
4
at the battery or engine block ground strap
5
the keypad of VFO knob
6
voltage and resistance
7
two non-harmonically related audio signal
8
all of the choices
9
frequency tolerance with respect to a range of temperature measured in PPM or parts per million
10
it is the ability of a receiver to distinguish between a signal and the desired
11
it is a measure of a receiver’s ability to reproduce very weak signals
12
a fuse or circuit breakers in series with the equipment
13
insulate the base of the tower to avoid lightning strikes
14
as far away from accessible areas possible
15
144.000 - 146.000 MHz
16
a loose connection in an antenna or a feed line
17
in series with the circuit
18
a measure of how well a load is matched to a transmission line
19
check your transmitter for off-frequency operation or spurious emissions
20
between the transmitter and the antenna
21
switch
22
all of the choices
23
contesting
24
say your call sign
25
begin your transmission with “priority” or “Emergency” followed by your call sign
26
wavelength in meters equals 300 divided by frequency in megahertz
27
the difference between the repeater’s transmit and receive frequencies
28
rosin-core solder
29
a directional antenna
30
it matches the antenna system impedance to the transceiver’s output impedance
31
a phenomenon in FM reception in which only the stronger of two signals at, or near , the same frequency will be
32
two-tone sine wave test
33
a pulse signal
34
frequency domain waveforms
35
all of the choices
36
all of the choices
37
initial deviation of a crystal or oscillator frequency as compared to the absolute at 25 deg. C
38
24.940 MHz
39
no one has priority access to frequencies, common courtesy should be a guide
40
connect all ground contacts to a single point
41
all of the choices
42
a capacitor in parallel
43
52.525 MHz
44
only where such communications directly relate to immediate safety of human life or protection of property
45
to permit ease of monitoring the transmit and receive frequencies when they are not the same
46
better precision for most uses
47
you receive reports of “hum” on your station’s transmitter signal
48
received signal strength
49
single sideband
50
131 feet
51
a probe used for analyzing and troubleshooting logical states
52
amplitude level and time duration
53
1 to 1
54
ensure that the circuit is not powered
55
1/2 wavelength at the operating frequency
56
when adjusting tuned circuits
57
band-reject filter
58
the alternator
59
the receiver RIT clarifier
60
an SWR meter
61
the 12-volt fuses
62
VHF, very high frequency range
63
a band-pass filter
64
computer
65
a center wire inside an insulting material covered by the metal sleeve or shield
66
a transmit-receive change-over switch
67
the relatively high frequency power oscillator allows the use of small, light weight and low-cost transformers in the switched-mode supply
68
2:01
69
be sure to turn off the transmitter and disconnect the feed line
70
for safety, hands-free operation
71
antenna
72
relay
73
a calibrated field-strength meter with a calibrated antenna
74
to ensure that dangerous voltages are removed if the cabinet is opened
75
the transceiver is set to different transmit and receive frequencies
76
RCA Phono
77
a unidirectional antenna
78
the radiation pattern of an antenna
79
50 ohm and 75 ohm
80
connect a high-pass filter to the transmitter output and low-pass filter to the antenna input of the television
81
1000
82
1/2 wavelength
83
the transceiver could use more current than 5 amps and a fire could occur
84
use a key-operated on/off switch in the main power line
85
several sets of charged batteries
86
it may cause splatter interference to other stations operating near its frequency
87
20 - 20,000 Hz
88
be sure no one can activate the transmitter
89
conduct the net on a clear frequency 3 to 5 kHz away from the regular net frequency
90
to set the audio level at which the transmitter activates
91
a monitoring oscilloscope
92
RF hot spots can occur in a station located above the ground floor of the equipment is grounded by a long ground wire
93
it will increase the output PEP
94
the socket’s wiring may not be adequate for the current being drawn by the transceiver
95
resonant frequency of an LC tank circuit
96
all of the choices
97
interference caused by the combining several signals in a non-linear device producing new unwanted frequencies
98
overloading of a receiver front-end by a strong off-channel signal causing a reduction in sensitivity
99
the transfer of the amplitude modulation of a strong unwanted carrier onto the wanted carrier caused by non-linearity in
100
an open circuit