G4A – Station configuration and operation

- [[G4A01]] (B)
What is the purpose of the notch filter found on many HF transceivers? #card
	- A. To restrict the transmitter voice bandwidth
	- B. To reduce interference from carriers in the receiver passband
	- C. To eliminate receiver interference from impulse noise sources
	- D. To remove interfering splatter generated by signals on adjacent frequencies
- [[G4A02]] (C)
What is the benefit of using the opposite or “reverse” sideband when receiving CW? #card
	- A. Interference from impulse noise will be eliminated
	- B. More stations can be accommodated within a given signal passband
	- C. It may be possible to reduce or eliminate interference from other signals
	- D. Accidental out-of-band operation can be prevented
- [[G4A03]] (C)
How does a noise blanker work? #card
	- A. By temporarily increasing received bandwidth
	- B. By redirecting noise pulses into a filter capacitor
	- C. By reducing receiver gain during a noise pulse
	- D. By clipping noise peaks
- [[G4A04]] (B)
What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier’s TUNE control? #card
	- A. A pronounced peak
	- B. A pronounced dip
	- C. No change will be observed
	- D. A slow, rhythmic oscillation
- [[G4A05]] (C)
Why is automatic level control (ALC) used with an RF power amplifier? #card
	- A. To balance the transmitter audio frequency response
	- B. To reduce harmonic radiation
	- C. To prevent excessive drive
	- D. To increase overall efficiency
- [[G4A06]] (C)
What is the purpose of an antenna tuner? #card
	- A. Reduce the SWR in the feed line to the antenna
	- B. Reduce the power dissipation in the feedline to the antenna
	- C. Increase power transfer from the transmitter to the feed line
	- D. All these choices are correct
- [[G4A07]] (A)
What happens as a receiver’s noise reduction control level is increased? #card
	- A. Received signals may become distorted
	- B. Received frequency may become unstable
	- C. CW signals may become severely attenuated
	- D. Received frequency may shift several kHz
- [[G4A08]] (D)
What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier? #card
	- A. Minimum SWR on the antenna
	- B. Minimum plate current without exceeding maximum allowable grid current
	- C. Highest plate voltage while minimizing grid current
	- D. Desired power output without exceeding maximum allowable plate current
- [[G4A09]] (C)
What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier? #card
	- A. To prevent key clicks on CW
	- B. To prevent transient overmodulation
	- C. To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output
	- D. To allow time for the amplifier power supply to reach operating level
- [[G4A10]] (B)
What is the function of an electronic keyer? #card
	- A. Automatic transmit/receive switching
	- B. Automatic generation of dots and dashes for CW operation
	- C. To allow time for switching the antenna from the receiver to the transmitter
	- D. Computer interface for PSK and RTTY operation
- [[G4A11]] (B)
Why should the ALC system be inactive when transmitting AFSK data signals? #card
	- A. ALC will invert the modulation of the AFSK mode
	- B. The ALC action distorts the signal
	- C. When using digital modes, too much ALC activity can cause the transmitter to overheat
	- D. All these choices are correct
- [[G4A12]] (C)
Which of the following is a common use of the dual-VFO feature on a transceiver? #card
	- A. To allow transmitting on two frequencies at once
	- C. To transmit on one frequency and listen on another
	- D. To improve frequency accuracy by allowing variable frequency output (VFO) operation
- [[G4A13]] (A)
What is the purpose of using a receive attenuator? #card
	- A. To prevent receiver overload from strong incoming signals
	- B. To reduce the transmitter power when driving a linear amplifier
	- C. To reduce power consumption when operating from batteries
	- D. To reduce excessive audio level on strong signals