Lesson 7: Station Equipment Flashcards
Which term describes the ability of a receiver to detect the presence of a signal?
A. Linearity
B. Sensitivity
C. Selectivity
D. Total Harmonic Distortion
B. Sensitivity
What is a transceiver?
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
A. A device that combines a receiver and transmitter
Which instrument would you use to measure electric potential?
A. An ammeter
B. A voltmeter
C. A wavemeter
D. An ohmmeter
B. A voltmeter.
Note: You would use a voltmeter to measure electric potential or electromotive force. Remember E (electromotive force) is measured in volts. Remember: think safety. Always use caution when taking readings in a live circuit.
What is the primary purpose of a dummy load?
A. To prevent transmitting signals over the air when making tests
B. To prevent over-modulation of a transmitter
C. To improve the efficiency of an antenna
D. To improve the signal-to-noise ratio of a receiver
A. To prevent transmitting signals over the air when making tests
Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
A. A VTVM
B. An antenna analyzer
C. A Q meter
D. A frequency counter
B. An antenna analyzer
Note: An antenna analyzer is an instrument that can be used to determine whether an antenna is resonant at the desired operating frequency. The antenna analyzer puts out a tiny signal just like your own transmitter, except the antenna analyzer can determine the reactance, impedance, standing wave ratio and resonant frequency of the antenna being evaluated, and in some cases it can detect a cable fault in your feed line.
What is the function of a transceiver’s PTT input?
A. Input for a key used to send CW
B. Switches transceiver from receive to transmit when grounded
C. Provides a transmit tuning tone when grounded
D. Input for a preamplifier tuning tone
B. Switches transceiver from receive to transmit when grounded
Which instrument is used to measure electric current?
A. An ohmmeter
B. An electrometer
C. A voltmeter
D. An ammeter
D. An ammeter
Which of the following types of solder should not be used for radio and electronic applications?
A. Acid-core solder
B. Lead-tin solder
C. Rosin-core solder
D. Tin-copper solder
A. Acid-core solder
Which of the following causes failure of coaxial cables?
A. Moisture contamination
B. Solder flux contamination
C. Rapid fluctuation in transmitter output power
D. Operation at 100% duty cycle for an extended period
A. Moisture contamination
Which of the following can cause radio frequency interference?
A. Fundamental overload
B. Harmonics
C. Spurious emissions
D. All of these choices are correct
D. All of these choices are correct
