G4A01
What kind of input signal is used to test the amplitude
linearity of a single-sideband phone transmitter while
viewing the output on an oscilloscope?
A. Normal speech
B. An audio-frequency sine wave
C. Two audio-frequency sine waves
D. An audio-frequency square wave
G4A02
When testing the amplitude linearity of a single-sideband
transmitter, what kind of audio tones are fed into the
microphone input and on what kind of instrument is the
transmitter output observed?
A. Two harmonically related tones are fed in, and the
output is observed on an oscilloscope
B. Two harmonically related tones are fed in, and the
output is observed on a distortion analyzer
C. Two non-harmonically related tones are fed in, and the
output is observed on an oscilloscope
D. Two non-harmonically related tones are fed in, and the
output is observed on a distortion analyzer
G4A03
What audio frequencies are used in a two-tone test of the
linearity of a single-sideband phone transmitter?
A. 20 Hz and 20 kHz tones must be used
B. 1200 Hz and 2400 Hz tones must be used
C. Any two audio tones may be used, but they must be
within the transmitter audio passband, and must be
harmonically related
D. Any two audio tones may be used, but they must be
within the transmitter audio passband, and should not be
harmonically related
G4A04
At what point in an HF transceiver block diagram would an
electronic TR switch normally appear?
A. Between the transmitter and low-pass filter
B. Between the low-pass filter and antenna
C. At the antenna feed point
D. At the power supply feed point
G4A05
Why is an electronic TR switch preferable to a mechanical
one?
A. It allows greater receiver sensitivity
B. Its circuitry is simpler
C. It has a higher operating speed
D. It allows cleaner output signals
G4A06
As a power amplifier is tuned, what reading on its grid-
current meter indicates the best neutralization?
A. A minimum change in grid current as the output circuit
is changed
B. A maximum change in grid current as the output circuit
is changed
C. Minimum grid current
D. Maximum grid current
G4A07
Why is neutralization necessary for some vacuum-tube
amplifiers?
A. To reduce the limits of loaded Q
B. To reduce grid-to-cathode leakage
C. To cancel AC hum from the filament transformer
D. To cancel oscillation caused by the effects of
interelectrode capacitance
G4A08
In a properly neutralized RF amplifier, what type of
feedback is used?
A. 5%
B. 10%
C. Negative
D. Positive
G4A09
What does a neutralizing circuit do in an RF amplifier?
A. It controls differential gain
B. It cancels the effects of positive feedback
C. It eliminates AC hum from the power supply
D. It reduces incidental grid modulation
G4A10
What is the reason for neutralizing the final amplifier
stage of a transmitter?
A. To limit the modulation index
B. To eliminate self oscillations
C. To cut off the final amplifier during standby periods
D. To keep the carrier on frequency
G4A11
What type of transmitter performance does a two-tone test
analyze?
A. Linearity
B. Carrier and undesired sideband suppression
C. Percentage of frequency modulation
D. Percentage of carrier phase shift
G4A12
What type of signals are used to conduct a two-tone test?
A. Two audio signals of the same frequency, but shifted
90-degrees and are within the transmitter's modulation
bandpass
B. Two non-harmonically related audio signals that are
within the modulation bandpass of a transmitter
C. Any two audio frequency signals as long as they are
within the transmitter's modulation bandpass
D. Two audio frequency range square wave signals of equal
amplitude that are within the transmitter's modulation
bandpass
G4A13
In what way is a diode like a switch?
A. It permits current flow at bias voltages less than its
zener voltage and blocks current at bias voltages greater
than its zener voltage
B. It permits current flow when reverse biased and blocks
current when forward biased
C. The voltage drop across it increases as forward bias
increases and decreases as reverse bias decreases
D. It permits current flow when forward biased and blocks
current when reverse biased
G4B01
What item of test equipment contains horizontal- and
vertical-channel amplifiers?
A. An ohmmeter
B. A signal generator
C. An ammeter
D. An oscilloscope
G4B02
What is a digital oscilloscope?
A. An oscilloscope used only for signal tracing in
digital circuits
B. An oscilloscope used only for troubleshooting
computers
C. An oscilloscope used only for troubleshooting
switching power supply circuits
D. An oscilloscope designed around digital technology
rather than analog technology
G4B03
How would a signal tracer normally be used?
A. To identify the source of radio transmissions
B. To make exact drawings of signal waveforms
C. To show standing wave patterns on open-wire feed-lines
D. To identify an inoperative stage in a receiver
G4B04
How is a noise bridge normally used?
A. It is connected at an antenna's feed point and reads
the antenna's noise figure
B. It is connected between a transmitter and an antenna
and is tuned for minimum SWR
C. It is connected between a receiver and an antenna of
unknown impedance and is tuned for minimum noise
D. It is connected between an antenna and ground and is
tuned for minimum SWR
G4B05
What is the best instrument to use to check the signal
quality of a CW or single-sideband phone transmitter?
A. A monitoring oscilloscope
B. A field-strength meter
C. A sidetone monitor
D. A signal tracer and an audio amplifier
G4B06
What signal source is connected to the vertical input of a
monitoring oscilloscope when checking the quality of a
transmitted signal?
A. The IF output of a monitoring receiver
B. The audio input of the transmitter
C. The RF signals of a nearby receiving antenna
D. The RF output of the transmitter
G4B07
What is the purpose of a field-strength meter?
A. To determine the standing-wave ratio on a transmission
line
B. To check the output modulation of a transmitter
C. To monitor relative RF output
D. To increase average transmitter output
G4B08
What simple instrument may be used to monitor relative RF
output during antenna and transmitter adjustments?
A. A field-strength meter
B. An antenna noise bridge
C. A multimeter
D. A metronome
G4B09
In order to raise the S-meter reading on a receiver from S8
to S9, how much must the power output of a transmitter be
increased?
A. Approximately 2 times
B. Approximately 3 times
C. Approximately 4 times
D. Approximately 5 times
G4B10
What type of information does a field strength meter
provide?
A. The gain in dBi of an antenna
B. The field pattern of an antenna
C. The presence and amount of phase distortion of a
transmitter
D. The presence and amount of amplitude distortion of a
transmitter
G4B11
For which of the following applications might you use a
field strength meter?
A. Close-in RDF work
B. A modulation monitor for a frequency or phase
modulation transmitter
C. An overmodulation indicator for a SSB transmitter
D. A keying indicator for a RTTY or packet transmitter
G4B12
What is one way a noise bridge might be used?
A. Determining an antenna's gain in dBi
B. Pre-tuning an antenna tuner
C. Determining the directivity of an antenna
D. Determining the line loss of the antenna system
G4B13
What information could a noise bridge directly provide
about an unknown length and type of transmission line?
A. Its characteristic impedance
B. Its velocity factor
C. Its loss in dB per 100-feet
D. Its reflection coefficient
G4B14
How would you connect an oscilloscope to an AM or SSB
transmitter to check transmitter modulation using double
trapezoidal patterns?
A. Couple the detected RF output signal to the vertical
plates; set the internal sweep to twice the modulating
frequency
B. Couple the RF output signal to the vertical plates and
external trigger; set the internal sweep to twice the
modulating frequency
C. Couple the RF output signal to the vertical plates;
apply the unmodulated RF drive signal to the horizontal
plates
D. Couple the detected RF output signal to the vertical
plates; apply a constant DC signal to the horizontal plates
G4C01
What devices would you install in home-entertainment
systems to reduce or eliminate audio-frequency
interference?
A. Bypass inductors
B. Bypass capacitors
C. Metal-oxide varistors
D. Bypass resistors
G4C02
What should be done if a properly operating amateur station
is the cause of interference to a nearby telephone?
A. Make internal adjustments to the telephone equipment
B. Install RFI filters at the affected telephone
C. Stop transmitting whenever the telephone is in use
D. Ground and shield the local telephone distribution
amplifier
G4C03
What sound is heard from a public-address system if audio
rectification of a nearby single-sideband phone
transmission occurs?
A. A steady hum whenever the transmitter's carrier is on
the air
B. On-and-off humming or clicking
C. Distorted speech from the transmitter's signals
D. Clearly audible speech from the transmitter's signals
G4C04
What sound is heard from a public-address system if audio
rectification of a nearby CW transmission occurs?
A. On-and-off humming or clicking
B. Audible, possibly distorted speech
C. Muffled, severely distorted speech
D. A steady whistling
G4C05
If your third-floor amateur station has a ground wire
running 33 feet down to a ground rod, why might you get an
RF burn if you touch the front panel of your HF
transceiver?
A. Because the ground rod is not making good contact with
moist earth
B. Because the transceiver's heat-sensing circuit is not
working to start the cooling fan
C. Because of a bad antenna connection, allowing the RF
energy to take an easier path out of the transceiver
through you
D. Because the ground wire is a resonant length on
several HF bands and acts more like an antenna than an RF
ground connection
G4C06
Which of the following is NOT an important reason to have a
good station ground?
A. To reduce the cost of operating a station
B. To reduce electrical noise
C. To reduce interference
D. To reduce the possibility of electric shock
G4C07
What is one good way to avoid stray RF energy in your
amateur station?
A. Keep the station's ground wire as short as possible
B. Use a beryllium ground wire for best conductivity
C. Drive the ground rod at least 14 feet into the ground
D. Make a couple of loops in the ground wire where it connects to your station
G4C08
Which of the following statements about station grounding
is NOT true?
A. Braid from RG-213 coaxial cable makes a good conductor
to tie station equipment together into a station ground
B. Only transceivers and power amplifiers need to be tied
into a station ground
C. According to the National Electrical Code, there
should be only one grounding system in a building
D. The minimum length for a good ground rod is 8 feet
G4C09
Which of the following statements about station grounding
is true?
A. The chassis of each piece of station equipment should
be tied together with high-impedance conductors
B. If the chassis of all station equipment is connected
with a good conductor, there is no need to tie them to an
earth ground
C. RF hot spots can occur in a station located above the
ground floor if the equipment is grounded by a long ground
wire
D. A ground loop is an effective way to ground station
equipment
G4C10
Which of the following is NOT covered in the National
Electrical Code?
A. Minimum conductor sizes for different lengths of
amateur antennas
B. The size and composition of grounding conductors
C. Electrical safety inside the ham shack
D. The RF exposure limits of the human body
G4C11
What can cause the unintended rectification of an RF
signal?
A. Induced currents in conductors that are in poor
electrical contact
B. Induced voltages in conductors that are in good
electrical contact
C. Capacitive coupling of the RF signal to ground
D. Excessive standing wave ratio (SWR) of the
transmission line system
G4C12
What is one cause of severe, broadband radio frequency
noise at an amateur radio station?
A. Not using a balun or line isolator to feed balanced
antennas
B. Lack of rectification of the transmitter's signal in
power conductors
C. An intermittent RF ground
D. The use of horizontal, rather than vertical antennas
G4C13
How can a ground loop be avoided?
A. Series connect ("daisy chain") all ground conductors
B. Connect the AC neutral conductor to the ground wire
C. Avoid using lockwashers and star washers in making
ground connections
D. Connect all ground conductors to a single point
G4D01
What is the reason for using a properly adjusted speech
processor with a single-sideband phone transmitter?
A. It reduces average transmitter power requirements
B. It reduces unwanted noise pickup from the microphone
C. It improves voice-frequency fidelity
D. It improves signal intelligibility at the receiver
G4D02
If a single-sideband phone transmitter is 100% modulated,
what will a speech processor do to the transmitter's power?
A. It will increase the output PEP
B. It will add nothing to the output PEP
C. It will decrease the peak power output
D. It will decrease the average power output
G4D03
What is the output PEP from a transmitter if an
oscilloscope measures 200 volts peak-to-peak across a 50-
ohm resistor connected to the transmitter output?
A. 100 watts
B. 200 watts
C. 400 watts
D. 1000 watts
G4D04
What is the output PEP from a transmitter if an
oscilloscope measures 500 volts peak-to-peak across a 50-
ohm resistor connected to the transmitter output?
A. 500 watts
B. 625 watts
C. 1250 watts
D. 2500 watts
G4D05
What is the output PEP of an unmodulated carrier
transmitter if an average-reading wattmeter connected to
the transmitter output indicates 1060 watts?
A. 530 watts
B. 1060 watts
C. 1500 watts
D. 2120 watts
G4D06
Which wires in a four-conductor line cord should be
attached to fuses in a 240-VAC primary (single phase) power
supply?
A. Only the "hot" (black and red) wires
B. Only the "neutral" (white) wire
C. Only the ground (bare) wire
D. All wires
G4D07
What size wire is normally used on a 20-ampere, 120-VAC
household appliance circuit?
A. AWG number 20
B. AWG number 16
C. AWG number 14
D. AWG number 12
G4D08
What maximum size fuse or circuit breaker should be used in
a household appliance circuit using AWG number 12 wiring?
A. 100 amperes
B. 60 amperes
C. 30 amperes
D. 20 amperes
G4D09
What operating benefit does properly adjusted speech
clipping provide?
A. It removes any distortion in the audio waveform
B. Deep clipping restores the natural sound of the audio
C. It prevents overdriving the transmitter's modulator
stage
D. It removes any AC hum and noise that might be in the audio
G4D10
What would be the voltage across a 50-ohm dummy load
dissipating 1200 watts?
A. 173 volts
B. 245 volts
C. 346 volts
D. 692 volts
G4E01
Which of the following connectors is NOT designed for RF
transmission lines?
A. PL-259
B. DB-25
C. Type N
D. BNC
G4E02
When installing a power plug on a line cord, which of the
following should you do?
A. Twist the wire strands neatly and fasten them so they
don't cause a short circuit
B. Observe the correct wire color conventions for plug
terminals
C. Use proper grounding techniques
D. All of these choices
G4E03
Which of the following power connections would be the best
for a 100-watt HF mobile installation?
A. A direct, fused connection to the battery using heavy
gauge wire
B. A connection to the fuse-protected accessory terminal
strip or distribution panel
C. A connection to the cigarette lighter
D. A direct connection to the alternator or generator
G4E04
Why is it best NOT to draw the DC power for a 100-watt HF
transceiver from an automobile's cigarette lighter socket?
A. The socket is not wired with an RF-shielded power
cable
B. The socket's wiring may not be adequate for the
current being drawn by the transceiver
C. The DC polarity of the socket is reversed from the
polarity of modern HF transceivers
D. The power from the socket is never adequately filtered
for HF transceiver operation
G4E05
Which of the following most limits the effectiveness of an
HF mobile transceiver operating in the 75-meter band?
A. The vehicle's electrical system wiring
B. The wire gauge of the DC power line to the transceiver
C. The HF mobile antenna system
D. The rating of the vehicle's alternator or generator
G4E06
Which of the following is true of both a permanent or
temporary emergency generator installation?
A. The generator should be located in a well ventilated
area
B. The installation should be grounded
C. Extra fuel supplies, especially gasoline, should not
be stored in an inhabited area
D. All of these choices
G4E07
Which of the following is true of a lead-acid storage
battery as it is being charged?
A. It tends to cool off
B. It gives off explosive oxygen gas
C. It gives off explosive hydrogen gas
D. It takes in oxygen from the surrounding air
G4E08
What is the name of the process by which sunlight is
directly changed into electricity?
A. Photovoltaic conversion
B. Photosensitive conduction
C. Photosynthesis
D. Photocoupling
G4E09
What is the approximate open-circuit voltage from a modern,
well illuminated photovoltaic cell?
A. 0.02 VDC
B. 0.5 VDC
C. 0.2 VDC
D. 1.38 VDC
G4E10
What determines the proper size solar panel to use in a
solar-powered battery-charging circuit?
A. The panel's voltage rating and maximum output current
B. The amount of voltage available per square inch of
panel
C. The panel's open-circuit current
D. The panel's short-circuit voltage
G4E11
What is the biggest disadvantage to using wind power as the
primary source of power for an emergency station?
A. The conversion efficiency from mechanical energy to
electrical energy is less that 2 percent
B. The voltage and current ratings of such systems are
not compatible with amateur equipment
C. A large electrical storage system is needed to supply
power when the wind is not blowing
D. All of these choices are correct
G4E12
What type of coaxial connector would be a good choice to
use for 10 GHz feed-line connections?
A. Type N
B. Type BNC
C. Type UHF
D. Type F
G4E13
Where should you avoid placing a gasoline-fueled generator
to power your station?
A. Inside a building or outside an open window
B. Close to cold water pipes or other grounded metal
objects
C. Close to a driven ground
D. Downwind from your station
G4E14
What safety precaution should you observe when using a
gasoline-fueled generator to power your home station?
A. Always ground the frame of the generator
B. Use only generators that produce a clean sine wave
output
C. Make sure that the engine is well lubricated
D. All of these choices are correct
G4E15
During a commercial power outage, why would it be unwise to
back feed the output of a gasoline generator into your
house wiring by connecting the generator through an AC wall
outlet?
A. It presents a hazard for electric company workers
B. You may draw too much current, overloading your
generator
C. Power may be restored to your house, damaging your
generator
D. All of these choices are correct