Which of the following provide digital voice modes?
AnswerDMR, D-STAR, and SystemFusion
DMR, D-STAR, and System Fusion are digital voice systems used in amateur radio.
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What is the maximum transmitter power an amateur station may use on the 12-meter band?
Answer1500 watts PEP output
The maximum transmitter power on the 12-meter band is 1500 watts PEP output under the rule cited by this question.
How is a product detector used?
AnswerUsed in a single sideband receiver to extract the modulated signal
A product detector mixes an incoming SSB signal with a locally generated carrier so the original audio modulation can be recovered.
What is meant by the term “flat-topping,” when referring to an amplitude-modulated phone signal?
AnswerSignal distortion caused by excessive drive or speech levels
Flat-topping occurs when excessive drive or speech level causes the tops of the modulation envelope to clip or flatten, producing distortion.
What is the approximate length for a 1/4 wave monopole antenna cut for 28.5 MHz?
Answer8 feet
A quarter-wave vertical is approximately 234 divided by frequency in MHz. At 28.5 MHz the result is a little over 8 feet.
Which of the following statements is true of single sideband (SSB)?
AnswerOnly one sideband is transmitted; the other sideband and carrier are suppressed
In SSB, only one sideband is transmitted; the carrier and the other sideband are suppressed.
What signal-recovery function can be performed by software in a software-defined radio?
AnswerDetection.
The official G7C11 source identifies detection as a function that can be performed in software in an SDR.
Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?
AnswerAmateur stations must not cause harmful interference to primary users and must accept interference from primary users
Secondary amateur allocations come with an interference obligation: amateur stations must protect primary users from harmful interference and tolerate interference from those primary users.
How does input amplifier gain affect receiver sensitivity?
AnswerInput amplifier gain is a parameter that affects receiver sensitivity.
The official G7C08 source identifies input amplifier gain as one of the parameters that affects receiver sensitivity.
How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
Answer2.4 watts
Power is voltage times current: 12 V × 0.2 A = 2.4 watts.
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
Answer416.7 Hz
If a 12.21 MHz oscillator is multiplied by 12 to reach 146.52 MHz, its deviation is also multiplied by 12. A final 5 kHz deviation therefore requires about 416.7 Hz at the oscillator.
Which symbol in figure G7-1 represents an NPN junction transistor?
AnswerSymbol 2
In Figure G7-1, symbol 2 is the NPN junction transistor symbol.
How does the attenuation of coaxial cable change with increasing frequency?
AnswerAttenuation increases
Coaxial-cable attenuation increases as frequency rises because conductor and dielectric losses become greater.
What is the inductance of three 10-millihenry inductors connected in parallel?
Answer3.3 millihenries
Three equal inductors in parallel have one-third the inductance of one inductor. Three 10-millihenry inductors therefore equal about 3.3 millihenries.
What is another name for a Winlink Remote Message Server?
AnswerGateway
A Winlink Remote Message Server is commonly called a gateway.
What inductance advantage can a ferrite-core toroidal inductor provide?
AnswerLarge values of inductance may be obtained.
The official G6B05 source identifies large obtainable inductance as one advantage of a ferrite-core toroidal inductor.
What is a shift register?
AnswerA clocked array of circuits that passes data in steps along the array
A shift register is a clocked chain of digital storage stages that moves data one step through the array with each clock event.
What type of modulation varies the instantaneous power level of the RF signal?
AnswerAmplitude modulation
Amplitude modulation varies the instantaneous amplitude, and therefore the instantaneous power level, of the RF signal.
On which HF and/or MF amateur bands are there portions where General class licensees cannot transmit?
Answer80 meters, 40 meters, 20 meters, and 15 meters
The General-class allocation does not include every part of the 80-, 40-, 20-, and 15-meter amateur bands. Portions of those bands are reserved for Amateur Extra privileges.
Who or what determines “good engineering and good amateur practice,” as applied to the operation of an amateur station in all respects not covered by the Part 97 rules?
AnswerThe FCC
For aspects of amateur operation not specifically covered by Part 97, the FCC determines what constitutes good engineering and good amateur practice.
What transmission-line element can be used for impedance matching at radio frequencies?
AnswerA length of transmission line.
The official G5A10 source identifies a properly selected length of transmission line as another RF impedance-matching device.
Which symbol in figure G7-1 represents a field effect transistor?
AnswerSymbol 1
In Figure G7-1, symbol 1 is the field-effect transistor symbol.
In what units is RF feed line loss usually expressed?
AnswerDecibels per 100 feet
RF feed-line loss is commonly specified as decibels of attenuation per 100 feet.
Volunteer Examiners are accredited by what organization?
AnswerA Volunteer Examiner Coordinator
Volunteer Examiners receive their accreditation from a Volunteer Examiner Coordinator rather than directly from the FCC.