2.7 KiB
T7A – Station equipment: receivers, transceivers, transmitter amplifiers, receive amplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, PTT, modulation
-
T7A01 (B) Which term describes the ability of a receiver to detect the presence of a signal? #card
- A. Linearity
- B. Sensitivity
- C. Selectivity
- D. Total Harmonic Distortion
-
T7A02 (A) What is a transceiver? #card
- 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
-
T7A03 (B) Which of the following is used to convert a signal from one frequency to another? #card
- A. Phase splitter
- B. Mixer
- C. Inverter
- D. Amplifier
-
T7A04 (C) Which term describes the ability of a receiver to discriminate between multiple signals? #card
- A. Discrimination ratio
- B. Sensitivity
- C. Selectivity
- D. Harmonic distortion
-
T7A05 (D) What is the name of a circuit that generates a signal at a specific frequency? #card
- A. Reactance modulator
- B. Phase modulator
- C. Low-pass filter
- D. Oscillator
-
T7A06 (C) What device converts the RF input and output of a transceiver to another band? #card
- A. High-pass filter
- B. Low-pass filter
- C. Transverter
- D. Phase converter
-
T7A07 (B) What is the function of a transceiver’s PTT input? #card
- 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
-
T7A08 (C) Which of the following describes combining speech with an RF carrier signal? #card
- A. Impedance matching
- B. Oscillation
- C. Modulation
- D. Low-pass filtering
-
T7A09 (B) What is the function of the SSB/CW-FM switch on a VHF power amplifier? #card
- A. Change the mode of the transmitted signal
- 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
-
T7A10 (B) What device increases the transmitted output power from a transceiver? #card
- A. A voltage divider
- B. An RF power amplifier
- C. An impedance network
- D. All these choices are correct
-
T7A11 (A) Where is an RF preamplifier installed? #card
- A. Between the antenna and receiver
- B. At the output of the transmitter power amplifier
- C. Between the transmitter and the antenna tuner
- D. At the output of the receiver audio amplifier