Technician pool, section T7A

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Subelement T7

PRACTICAL CIRCUITS

Section T7A

Station equipment: receivers, transceivers, transmitter amplifiers, RF preamplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, Push-To-Talk (PTT), VFO, modulation

T7A01

Which term describes the ability of a receiver to detect the presence of a signal?

A.
RF gain
Correct Answer
B.
Sensitivity
C.
Selectivity
D.
Total Harmonic Distortion

T7A01

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T7A02

What is a transceiver?

Correct Answer
A.
A device that combines a receiver and transmitter
B.
A device for matching feed line impedance to 50 ohms
C.
A device for automatically sending and decoding Morse code
D.
A device for converting receiver and transmitter frequencies to another band

T7A02

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T7A03

Which of the following is used to convert a signal from one frequency to another?

A.
Phase splitter
Correct Answer
B.
Mixer
C.
Inverter
D.
Amplifier

T7A03

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T7A04

Which term describes the ability of a receiver to discriminate between multiple signals?

A.
Discrimination ratio
B.
Sensitivity
Correct Answer
C.
Selectivity
D.
Harmonic distortion

T7A04

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T7A05

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

A.
Reactance modulator
B.
Phase modulator
C.
Low-pass filter
Correct Answer
D.
Oscillator

T7A05

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T7A06

What device converts the RF input and output of a transceiver to another band?

A.
High-pass filter
B.
Low-pass filter
Correct Answer
C.
Transverter
D.
Phase converter

T7A06

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T7A07

What is the function of a transceiver’s PTT input?

A.
Input for a key used to send CW
Correct Answer
B.
Switches transceiver from receive to transmit when grounded
C.
Provides a transmit tuning tone when grounded
D.
Input for a preamplifier tuning tone

T7A07

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T7A08

Which of the following describes combining speech with an RF carrier signal?

A.
Impedance matching
B.
Oscillation
Correct Answer
C.
Modulation
D.
Low-pass filtering

T7A08

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T7A09

What is the function of the switch which selects either SSB or CW-FM on a VHF power amplifier?

A.
Change the mode of the transmitted signal
Correct Answer
B.
Set the amplifier for proper operation in the selected mode
C.
Change the frequency range of the amplifier to operate in the proper segment of the band
D.
Reduce the received signal noise

T7A09

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T7A10

What can be added to the output of a transceiver to increase the transmitted output power?

A.
A potentiometer
Correct Answer
B.
An RF power amplifier
C.
An impedance multiplier
D.
All these choices are correct

T7A10

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T7A11

What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?

Correct Answer
A.
Set the receive and transmit frequency
B.
Provide automatic frequency control
C.
Inject a variable frequency to allow CW reception
D.
Generate and demodulate single sideband signals

T7A11

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