What is the purpose of the notch filter found on many HF transceivers?

1. A To restrict the transmitter voice bandwidth
2. B To reduce interference from carriers in the receiver passband
3. C To eliminate receiver interference from impulse noise sources
4. D To remove interfering splatter generated by signals on adjacent frequencies

What is the benefit of using the opposite or "reverse" sideband when receiving CW?

1. A Interference from impulse noise will be eliminated
2. B More stations can be accommodated within a given signal passband
3. C It may be possible to reduce or eliminate interference from other signals
4. D Accidental out-of-band operation can be prevented

How does a noise blanker work?

1. A By temporarily increasing received bandwidth
2. B By redirecting noise pulses into a filter capacitor
3. C By reducing receiver gain during a noise pulse
4. D By clipping noise peaks

What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier's TUNE control?

1. A A pronounced peak
2. B A pronounced dip
3. C No change will be observed
4. D A slow, rhythmic oscillation

Why is automatic level control (ALC) used with an RF power amplifier?

1. A To balance the transmitter audio frequency response
2. B To reduce harmonic radiation
3. C To prevent excessive drive
4. D To increase overall efficiency

What is the purpose of an antenna tuner?

1. A Reduce the SWR in the feed line to the antenna
2. B Reduce the power dissipation in the feedline to the antenna
3. C Increase power transfer from the transmitter to the feed line
4. D All these choices are correct

What happens as a receiver's noise reduction control level is increased?

1. A Received signals may become distorted
2. B Received frequency may become unstable
3. C CW signals may become severely attenuated
4. D Received frequency may shift several kHz

What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?

1. A Minimum SWR on the antenna
2. B Minimum plate current without exceeding maximum allowable grid current
3. C Highest plate voltage while minimizing grid current
4. D Desired power output without exceeding maximum allowable plate current

What is the purpose of delaying RF output after activating a transmitter's keying line to an external amplifier?

1. A To prevent key clicks on CW
2. B To prevent transient overmodulation
3. C To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output
4. D To allow time for the amplifier power supply to reach operating level

What is the function of an electronic keyer?

1. A Automatic transmit/receive switching
2. B Automatic generation of dots and dashes for CW operation
3. C To allow time for switching the antenna from the receiver to the transmitter
4. D Computer interface for PSK and RTTY operation

Why should the ALC system be inactive when transmitting AFSK data signals?

1. A ALC will invert the modulation of the AFSK mode
2. B The ALC action distorts the signal
3. C When using digital modes, too much ALC activity can cause the transmitter to overheat
4. D All these choices are correct

Which of the following is a common use of the dual-VFO feature on a transceiver?

1. A To allow transmitting on two frequencies at once
2. B To permit full duplex operation -- that is, transmitting and receiving at the same time
3. C To transmit on one frequency and listen on another
4. D To improve frequency accuracy by allowing variable frequency output (VFO) operation

What is the purpose of using a receive attenuator?

1. A To prevent receiver overload from strong incoming signals
2. B To reduce the transmitter power when driving a linear amplifier
3. C To reduce power consumption when operating from batteries
4. D To reduce excessive audio level on strong signals