G4B-2011: Test and monitoring equipment; two-tone test
What item of test equipment contains horizontal and vertical channel amplifiers?
A signal generator
Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
Complex waveforms can be measured
An oscilloscope uses less power
Complex impedances can be easily measured
Input impedance is much lower
Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?
A field-strength meter
A sidetone monitor
What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
The attenuated RF output of the transmitter
The local oscillator of the transmitter
An external RF oscillator
The transmitter balanced mixer output
Why is high input impedance desirable for a voltmeter?
It decreases the loading on circuits being measured
It improves the frequency response
It decreases battery consumption in the meter
It improves the resolution of the readings
What is an advantage of a digital voltmeter as compared to an analog voltmeter?
Better precision for most uses
Better for measuring computer circuits
Better for RF measurements
Which of the following might be a use for a field strength meter?
Close-in radio direction-finding
A modulation monitor for a frequency or phase modulation transmitter
An overmodulation indicator for a SSB transmitter
A keying indicator for a RTTY or packet transmitter
Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?
A field-strength meter
An antenna noise bridge
A Q meter
Which of the following can be determined with a field strength meter?
The radiation pattern of an antenna
The radiation resistance of an antenna
The presence and amount of phase distortion of a transmitter
The presence and amount of amplitude distortion of a transmitter
Which of the following can be determined with a directional wattmeter?
Standing wave ratio
Antenna front-to-back ratio
Radio wave propagation
Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
Antenna and feed line
All of these choices are correct
What problem can occur when making measurements on an antenna system with an antenna analyzer?
Strong signals from nearby transmitters can affect the accuracy of measurements
SWR readings may be incorrect if the antenna is too close to the Earth
The analyzer can be damaged if measurements outside the ham bands are attempted
Connecting the analyzer to an antenna can cause it to absorb harmonics
What is a use for an antenna analyzer other than measuring the SWR of an antenna system?
Determining the impedance of an unknown or unmarked coaxial cable
Measuring the front to back ratio of an antenna
Measuring the turns ratio of a power transformer
Determining the gain of a directional antenna
What is an instance in which the use of an instrument with analog readout may be preferred over an instrument with a numerical digital readout?
When adjusting tuned circuits
When testing logic circuits
When high precision is desired
When measuring the frequency of an oscillator
What type of transmitter performance does a two-tone test analyze?
Carrier and undesired sideband suppression
Percentage of frequency modulation
Percentage of carrier phase shift
What signals are used to conduct a two-tone test?
Two non-harmonically related audio signals
Two audio signals of the same frequency shifted 90-degrees
Two swept frequency tones
Two audio frequency range square wave signals of equal amplitude
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer