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Ham Radio > Vocabulary > Flashcards

Vocabulary Flashcards

1
Q

Abbreviation for Voltage

A

E

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2
Q

Voltage is measured in __________

A

volts

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3
Q

Abbreviate for current

A

I

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4
Q

Current is measured in _________

A

amperes

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5
Q

Abbreviation for resistance

A

R

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6
Q

Resistance is measured in

A

Ohms

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7
Q

V (E) = ? times ?

A

V (E) = current (I) x resistance (R)

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8
Q

Power (P) = ? times ?

A

Power (P) = voltage (E) x current (I)

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9
Q

Abbreviation for power

A

P

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10
Q

Power is measured in______

A

watts

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11
Q 
?
?
?
base unit ( e.g. MHz)
?
?
?
?
A 
giga
mega
kilo
(base unit)
milli
micro
nano
pico
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12
Q

If you had an increase of 3dB = x ?

A

x 2

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13
Q

If you had an increase of 6db = x ?

A

x 4

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14
Q

If you had an increase of 10 db = x ?

A

x 10

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15
Q

Label for inductors

A

Henry

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16
Q

FET

A

Field Effect Transistor

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17
Q

What controls current flow?

A

transistors

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18
Q

What changes from AC to DC?

A

rectifier

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19
Q

What changes voltage?

A

transformer

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20
Q

What changes RF to a different band?

A

transverter

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21
Q

SSB/CW-FM switch does what?

A

sets amplifier for proper operation in selected mode.

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22
Q

What does a mixer do?

A

converts radio signal from one frequency to another

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23
Q

What does an ohm measure?

A

resistance

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24
Q

What frequencies are in the HF band?

A

3-30MHz

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25
Q

What wavelengths are in the HF band?

A

100m - 10m

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26
Q

What frequencies are in the VHF band?

A

30-300MHz

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27
Q

What wavelengths are in the VHF band?

A

10m - 1m

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28
Q

What frequencies are in the UHF band?

A

300-3000 MHz

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29
Q

What wavelengths are in the UHF band?

A

1m - 0.1m

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30
Q

What does a multimeter measure?

A

voltage and resistance

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31
Q

What does FM stand for?

A

frequency modulation

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32
Q

What is SSB?

A

Single side band - a type of amplitude modulation

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33
Q

Transmitters reduce output power to protect?

A

output amplifier resistors

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34
Q

FT8 digital mode

A

low signal to noise ratio - less interference

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35
Q

NTSC is?

A

analog fast color scan TV

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36
Q

PSK

A

phase shift keying - communicate via keyboard

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37
Q

DMR = ?

A

digital mobile ratio - multiplexing tech doubles capacity

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38
Q

Satellite operating mode:

A

U/V uplink 70cm downlink 2M

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39
Q

Doppler shift causes

A

change in frequency

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40
Q

QRM refers to?

A

man-made interference

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41
Q

QRN refers to ?

A

interference due to static

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42
Q

RACES

A

emergency help for government / FCC

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43
Q

ARES

A

emergency for private companies

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44
Q

Simplex

A

transmitting and receiving on the same frequency

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45
Q

Capacitors are measured in ____________

A

farads

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46
Q

What do capacitors do?

A

store electric energy

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47
Q

What do inductors do?

A

store magnetic energy

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48
Q

What is the purpose of nets?

A

To allow a number of amateurs to use a single frequency.

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49
Q

PL (private line) tones and codes use ______

A

CTCSS (continuous tone-coded squelch system)

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50
Q

IRLP (Internet Relay Linking Project) uses _____________

A

DTMF tones

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51
Q

What is a check?

A

number of words or word equivalents in the text portion of the message.

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52
Q

DMR talk groups allow you to _________

A

share a single DMR channel at different times without being heard by the other users and groups on the channel.

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53
Q

What kind of polarization is associated with the term “skip”?

A

vertical and horizontal polarization.

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54
Q

How fast to radio waves travel in meters? in km?

A

300,000,000 meters per second

300,000 km per second

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55
Q

What wavelengths are not affected by fog?

A

10m and 6m wavelengths

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56
Q

When is knife-edge diffraction used?

A

to accomplish reliable two-way communications despite obstructions

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57
Q

The ionosphere has little or no effect on what type of radio waves?

A

UHF

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58
Q

If you can see the other amateur station, why can probably communicate to them via VHF or UHF frequencies?

A

The Earth seems less curved to radio waves than to light waves.

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59
Q

What causes irregular fading of a RF signal?

A

random combining of radio waves arriving via different paths.

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60
Q

Propagation type sporadic E is when you hear amateur stations________

A

located past the horizon on 10m, 6m and 2meters.

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61
Q

If you hear stations on VHF that are much farther away than your repeater or line of site, it is caused by _____

A

auroral reflection

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62
Q

What property is used to describe polarization?

A

electric field

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63
Q

What type of wire should you use to handle most modern HF transceivers?

A

heavy-gauge wire with connections as short as possible. When voltage falls below a certain value, the radio will not operate correctly.

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64
Q

What digital mode pack as many different signals as possible into a 3kHz bandwidth?

A

FT8

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65
Q

Impedance is measured in _________

A

ohms

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66
Q

Nearly all mobile transceivers are designed to work with what type of electrical system?

A

12volts

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67
Q

The current flowing through each component in

parallel depends on_______________

A

the component’s type and value.

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68
Q

What happens to the current at the junction of two components in a series?

A

It is unchanged.

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69
Q

In a parallel circuit, the circuit flow for each individual component added together equals____________

A

total current flow for the whole parallel circuit.

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70
Q

Voltage across two components in parallel is ____________________

A

the same voltage as the source

71
Q

When components are connected in series, the same current flows through all the components but _____________

A

the voltage drops across each component depending on the type and value of the component.

72
Q

Electric current is measured in _________

A

amperes

73
Q

What is the definition of current?

A

The flow of electrons in an electrical circuit.

74
Q

What controls the amount of voltage from a power supply?

A

Regulator

75
Q

What types of batteries are not rechargeable?

A

carbon-zinc

76
Q

What can reduce overload to a VHF transceiver from a nearby FM broadcast station?

A

band reject filter

77
Q

What is SWR (standing wave ratio)

A

measure of how well a load is matched to a transmission line.

78
Q

Why is output power is reduced as SWR increases?

A

to protect the outpout amplifier transistors.

79
Q

If you are told you are overdeviating what should you do?

A

Talk farther away from the microphone.

80
Q

Power lost in a feed line is dissipated as_______

A

heat

81
Q

What type of line has the lowest loss at VHF and UHF frequencies?

A

air-insulated

82
Q

Which antenna is better 5/8 wavelength or quarter wavelength?

A

5/8

83
Q

Which coaxial cable has the least amount of loss at a given frequency?

A

RG-8

84
Q

What makes antennas to appear electrically longer?

A

inductors inserted in series with the radiating portion of the antenna.

85
Q

If the average time for RF exposure is 6 minutes and the signal is present for 3 minutes and absent for 3 minutes then the power density permitted is_____

A

two times as much

86
Q

FCC bulletin, computer modeling and measurement of field strength are all acceptable methods to determine_________

A

if your station meets FCC exposure regulation requirements.

87
Q

IRLP uses what types of tones?

A

DTMF (dual tone multi frequency)

88
Q

What is a form of amplitude modulation?

A

single sideband

89
Q

What reduces ignition interference to a receiver?

A

noise blanker

90
Q

Which Q signal indicates that you are changing frequency?

A

QSY

91
Q

What antenna polarization is normally used for long-distance weak-signal CW and SSB contacts using the VHF and UHF bands?

A

Horizontal

92
Q

What is meant by the statement that a satellite is operating in mode U/V?

A

The satellite frequencies are usually variable

93
Q

What describes the number of times per second that al alternating current makes a complete cycle?

A

frequency

94
Q

What is FT8

A

Digital mode capable of operating in low signal-to-noise conditions that transmits on 15 second intervals.

95
Q

What is an ARQ transmission system?

A

A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information.

96
Q

What component can consist of three layers of semiconductor material?

A

Transistor

97
Q

What is the electrical difference between RG-58 and RG-8 coaxial cable?

A

RG-8 cable has less loss at a given frequency.

98
Q

What are inputs to a satellite tracking program?

A

Keplerian elements

99
Q

What is good practice when installing ground wires on a tower for lightning protection?

A

Ensure that connections are short and direct

100
Q

How many volts are equal to one microvolt?

A

one one-millionth of a volt

101
Q

What type of modulation is most commonly used for VHF packet radio transmissions?

A

FM

102
Q

What type of connector is most suitable for frequencies above 400 MHz?

A

Type N connector

103
Q

Electrical current is measured in what unit?

A

amperes = measure electrical current
volts = measures electric potential, aka electromotive force, analogous to water pressure
ohms = measures resistance
watts = measures power - the rate at which work is done

104
Q

What is an advantage of SSB over FM for voice transmissions?

A

SSB signals have a narrower bandwidth

105
Q

What factors affect RF exposure of people near an amateur station antenna?

A

All of these choices are correct.

Frequency, power, distance and radiation

106
Q

When may an amateur station transmit without on-the-air identification?

A

when transmitting signals to control model craft

107
Q

What class of electronic components uses a voltage or current signal to control current flow?

A

transistors

108
Q

Which of the following best describes Broadband-Hamnet, also referred to as a high-speed multi-media network?

A

An amateur-radio-based data network using commercial Wi-Fi gear with modified firmware

109
Q

What is a safety hazard of a 12 volt storage battery?

A

shorting the terminals can cause burns, fire, or an explosion.

110
Q

What is the proper location for an external SWR meter?

A

In series with the feed line, between the transmitter and antenna.

111
Q

What is a common reason to use shielded wire?

A

To prevent coupling of unwanted signals to or from the wire

112
Q

What is combined with an inductor to make a tuned circuit?

A

Resistor

113
Q

What property of a radio wave is used to describe its polarization?

A

orientation of the electric field

114
Q

What is the FCC Part 97 definition of a beacon?

A

An amateur station transmitting communications for the purposes of observing propagation or related experimental activities.

115
Q

What measurement is commonly made using a multimeter?

A

voltage and resistance

116
Q

What is a good way to judge whether your uplink power is neither too low nor too high?

A

Your signal strength on the downlink should be about the same as the beacon.

117
Q

What method of call sign identification is required for a station transmitting phone signals?

A

send the call sign using a CW or phone emission

118
Q

In the US, what is connect to the green wire in a three-wire electrical AC plug?

A

Equipment ground

119
Q

What best describes DMR (Digital Mobile Radio)?

A

A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel

120
Q

What method is used to locate sources of noise interference or jamming?

A

radio direction finding

121
Q

What component can be used as an electronic switch or amplifier?

A

Transistor

122
Q

What is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 MHz?

A

19 inches

123
Q

SSB uses what KHz?

A

3 KHz

124
Q

What is the impedance of most coaxial cables used in amateur radio installations?

A

50 ohms

125
Q

What is the most common offset in the 2 meter band?

A

-600 or +600 KHz

126
Q

What is a common repeater offset for the 70cm band?

A

-5 or +5 MHz

127
Q

The approximate length, in inches of a quarter-wavelength vertical antenna for 146MHz is________

A

19 inches

128
Q

The approximate length, in inches, of a half-wavelength 6 meter dipole antenna is?

A

112 inches

129
Q

What is the maximum power level that an amateur station may use at VHF frequencies before an RF exposure evaluation is required?

A

50 watts PEP at the attena

130
Q

What is the maximum peak envelope power output for Technician class operators using their assigned portions of the HF bands?

A

200 watts

131
Q

Except for some specific restrictions, what is the maximum peak envelope power output for Technician class operators using frequencies above 30 MHz

A

1500 watts

132
Q

What band is best suited for communicating via meteor scatter?

A

6 meter band

133
Q

Technician class licensee may operate on frequencies above 30 MHz using the full power authorized for amateur transmissions which is ____?

A

1500 watts

134
Q

What is the lowest value for maximum permissible exposure limit?

A

50 MHz

135
Q

What are the frequency limits of the UHF spectrum?

A

300-3000 MHz

136
Q

Which frequency is within the 6 meter amateur band?

A

52.525 MHz

137
Q

What is the approximate bandwidth of a SSB voice signal?

A

3 kHz

138
Q

What is the approximate maximum bandwidth required to transmit a CW signal?

A

150 Hz

139
Q

Which band follows the sun and is good during daylight hours?

A

10m band

140
Q

What band is often referred to as the “magic band”?

A

6m

141
Q

What is the approximate bandwidth of a VHF repeater FM phone signal?

A

Between 10 and 15 KHz

142
Q

219 - 220 MHz is what band?

A

1.25 meter band

143
Q

Only the 1.25 meter band amateurs can only use it for?

A

fixed digital message forwarding

144
Q

The 2 meter band has a frequency of what?

A

144 MHz

145
Q

What HF band has frequencies available to the Technician class operator for RTTY and data transmissions?

A

10 meter band only

146
Q

Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for CW reception?

A

500 Hz

147
Q

What is the typical bandwidth of analog fast-scan TV transmissions on the 70 centimeter band?

A

About 6 MHz

148
Q

Upper side band SSB is used for what?

A

10m, HF, VHF, UHF

149
Q

What type of circuit controls the amount of voltage from a power supply?

A

regulator

150
Q

Which of the following is true of PL-259 type coax connectors?

A

They are commonly used at HF frequencies.

151
Q

Why is coaxial cable the most common feed line selected for amateur radio antenna systems?

A

It is easy to use and requires few special installation considerations

152
Q

What is the function of the SSB/CW-FM switch on a VHF power amplifier?

A

Set the amplifier for proper operation in the selected mode.

153
Q

What electrical component can amplify signals?

A

Transistors

154
Q

What is the name of a circuit the generates a signal at a specific frequency?

A

Oscillator

155
Q

Which of the following is true when installing grounding conductors used for lightning protection?

A

sharp bends must be avoided

156
Q

What class of electronic components uses a voltage or current signal to control current flow?

A

Transistors

157
Q

What electrical parameter is controlled by a potentiometer?

A

Resistance

158
Q

What brief statement indicates that you are listening on a repeater and looking for a contact?

A

Your call sign.

159
Q

What is an example of automatic control?

A

repeater operation

160
Q

Which of the following is combined with an inductor to make a tuned circuit?

A

capacitor

161
Q

What is remote control as defined in Part 97?

A

Operating the station over the internet.

162
Q

Which of the following types of emission has the narrowest bandwidth?

A

CW

163
Q

What type of electrical component consists of two or emore conductive surfaces separated by an insulator?

A

Capacitor

164
Q

Which of the following devices or circuits changes an alternating current into a varying direct current signal?

A

rectifier

165
Q

10.) Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for SSB reception?

500 Hz
1000 Hz
2400 Hz
5000 Hz

A

2400 Hz

166
Q

9) Which of the following is a common repeater frequency offset in the 2-meter band?

A

Plus or minus 600 kHz

167
Q

8) What property of a radio wave is used to describe its polarization?

A

The orientation of the electric field

168
Q

7) What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?

A

Permits noise or interference reduction by selecting a bandwidth matching the mode.

169
Q

What is another way to specify a radio signal frequency of 1,500,000 hertz?

1500 kHz
1500 MHz
15 GHz
150 kHz

A

1500 kHz

170
Q

5) What is the approximate bandwidth of a SSB voice signal?

A

3 kHz

171
Q

4) What is the function of the SSB/CW-FM switch on a VHF power amplifier?

A

Set the amplifier for proper operation in the selected mode.

172
Q

3) What is the approximate bandwidth of a VHF repeater FM phone signal?

A

Between 10 and 15 kHz

173
Q

2) What happens to current at the junction of two components in series?

A

It is unchanged.

174
Q

1) Which of the following is an example of remote control as defined in Part 97?

A

Operating the station over the internet.

Ham Radio (1 decks)

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