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| G4A01 -What is the purpose of the "notch filter" found on many HF transceivers? 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 enhance the reception of a specific frequency on a crowded band |
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| G4A02 -What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver? 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 |
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| G4A03 -What is normally meant by operating a transceiver in "split" mode? A. The radio is operating at half power B. The transceiver is operating from an external power source C. The transceiver is set to different transmit and receive frequencies D. The transmitter is emitting a SSB signal, as opposed to DSB operation |
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| G4A04 -What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control? A. A pronounced peak B. A pronounced dip C. No change will be observed D. A slow, rhythmic oscillation |
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| G4A05 -What is a purpose of using Automatic Level Control (ALC) with a RF power amplifier? A. To balance the transmitter audio frequency response B. To reduce harmonic radiation C. To reduce distortion due to excessive drive D. To increase overall efficiency |
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| G4A06 -What type of device is often used to enable matching the transmitter output to an impedance other than 50 ohms? A. Balanced modulator B. SWR Bridge C. Antenna coupler D. Q Multiplier |
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| G4A07 -What condition can lead to permanent damage when using a solid-state RF power amplifier? A. Exceeding the Maximum Usable Frequency B. Low input SWR C. Shorting the input signal to ground D. Excessive drive power |
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| G4A08 -What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier? 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. Maximum power output without exceeding maximum allowable plate current |
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| G4A09 -Why is a time delay sometimes included in a transmitter keying circuit? A. To prevent stations from talking over each other B. To allow the transmitter power regulators to charge properly C. To allow time for transmit-receive changeover operations to complete properly before RF output is allowed D. To allow time for a warning signal to be sent to other stations |
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| G4A10 -What is the purpose of an electronic keyer? A. Automatic transmit/receive switching B. Automatic generation of strings of dots and dashes for CW operation C. VOX operation D. Computer interface for PSK and RTTY operation |
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| G4A11 -Which of the following is a use for the IF shift control on a receiver? A. To avoid interference from stations very close to the receive frequency B. To change frequency rapidly C. To permit listening on a different frequency from that on which you are transmitting D. To tune in stations that are slightly off frequency without changing your transmit frequency |
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| G4A12 -Which of the following is a common use for the dual VFO feature on a transceiver? A. To allow transmitting on two frequencies at once B. To permit full duplex operation, that is transmitting and receiving at the same time C. To permit ease of monitoring the transmit and receive frequencies when they are not the same D. To facilitate computer interface |
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| G4A13 -What is one reason to use the attenuator function that is present on many HF transceivers? A. To reduce signal overload due to 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 slow down received CW signals for better copy |
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| G4A14 -How should the transceiver audio input be adjusted when transmitting PSK31 data signals? A. So that the transceiver is at maximum rated output power B. So that the transceiver ALC system does not activate C. So that the transceiver operates at no more than 25% of rated power D. So that the transceiver ALC indicator shows half scale |
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