General › G4
G4 Amateur Radio Practices
60 questions in the pool. Your exam will include 5, one from each group below.
G4A
Station configuration and operation
- G4A01What is the purpose of the notch filter found on many HF transceivers?
- G4A02What is the benefit of using the opposite or “reverse” sideband when receiving CW?
- G4A03How does a noise blanker work?
- G4A04What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier's TUNE control?
- G4A05Why is automatic level control (ALC) used with an RF power amplifier?
- G4A06What is the purpose of an antenna tuner?
- G4A07What happens as a receiver's noise reduction control level is increased?
- G4A08What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?
- G4A09What is the purpose of delaying RF output after activating a transmitter's keying line to an external amplifier?
- G4A10What is the function of an electronic keyer?
- G4A11Why should the ALC system be inactive when transmitting AFSK data signals?
- G4A12Which of the following is a common use of the dual-VFO feature on a transceiver?
- G4A13What is the purpose of using a receive attenuator?
G4B
Tests and test equipment
- G4B01What item of test equipment contains horizontal and vertical channel amplifiers?
- G4B02Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
- G4B03Which of the following is the best instrument to use for checking the keying waveform of a CW transmitter?
- G4B04What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
- G4B05Why do voltmeters have high input impedance?
- G4B06What is an advantage of a digital multimeter as compared to an analog multimeter?
- G4B07What signals are used to conduct a two-tone test?
- G4B08What transmitter performance parameter does a two-tone test analyze?
- G4B09When is an analog multimeter preferred to a digital multimeter?
- G4B10Which of the following can be determined with a directional wattmeter?
- G4B11Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
- G4B12What effect can strong signals from nearby transmitters have on an antenna analyzer?
- G4B13Which of the following can be measured with an antenna analyzer?
G4C
Interference to consumer electronics; grounding and bonding
- G4C01Which of the following might be useful in reducing RF interference to audio frequency circuits?
- G4C02Which of the following could be a cause of interference covering a wide range of frequencies?
- G4C03What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?
- G4C04What sound is heard from an audio device experiencing RF interference from a CW transmitter?
- G4C05What is a possible cause of high voltages that produce RF burns?
- G4C06What is a possible effect of a resonant ground connection?
- G4C07Why should soldered joints not be used in lightning protection ground connections?
- G4C08Which of the following would reduce RF interference caused by common-mode current on an audio cable?
- G4C09How can the effects of ground loops be minimized?
- G4C10What could be a symptom caused by a ground loop in your station's audio connections?
- G4C11What technique helps to minimize RF “hot spots” in an amateur station?
- G4C12Why must all metal enclosures of station equipment be grounded?
G4D
Speech processors; S meters; sideband operation near band edges
- G4D01What is the purpose of a speech processor in a transceiver?
- G4D02How does a speech processor affect a single sideband phone signal?
- G4D03What is the effect of an incorrectly adjusted speech processor?
- G4D04What does an S meter measure?
- G4D05How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?
- G4D06How much change in signal strength is typically represented by one S unit?
- G4D07How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?
- G4D08What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
- G4D09What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
- G4D10How close to the lower edge of a band's phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?
- G4D11How close to the upper edge of a band's phone segment should your displayed carrier frequency be when using 3 kHz wide USB?
G4E
Mobile and portable HF stations; alternative energy source operation
- G4E01What is the purpose of a capacitance hat on a mobile antenna?
- G4E02What is the purpose of a corona ball on an HF mobile antenna?
- G4E03Which of the following direct, fused power connections would be the best for a 100-watt HF mobile installation?
- G4E04Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle's auxiliary power socket?
- G4E05Which of the following most limits an HF mobile installation?
- G4E06What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?
- G4E07Which of the following may cause receive interference to an HF transceiver installed in a vehicle?
- G4E08In what configuration are the individual cells in a solar panel connected together?
- G4E09What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
- G4E10Why should a series diode be connected between a solar panel and a storage battery that is being charged by the panel?
- G4E11What precaution should be taken when connecting a solar panel to a lithium iron phosphate battery?