General Class License Exam Questions
Signals and Emissions
Question Display Options:
Group G8A Carriers and modulation; AM; FM; single sideband; modulation envelope; digital modulation; over modulation
G8A01 How is an FSK signal generated?
G8A02 What is the name of the process that changes the phase angle of an RF wave to convey information?
G8A03 What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?
G8A04 What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?
G8A05 What type of modulation varies the instantaneous power level of the RF signal?
G8A06 What is one advantage of carrier suppression in a single sideband phone transmission versus full carrier amplitude modulation?
G8A07 Which of the following phone emissions uses the narrowest bandwidth?
G8A08 Which of the following is an effect of overmodulation?
G8A09 What control is typically adjusted for proper ALC setting on an amateur single sideband transceiver?
G8A10 What is meant by the term flat-topping when referring to a single sideband phone transmission?
G8A11 What is the modulation envelope of an AM signal?
Group G8B Frequency mixing; multiplication; bandwidths of various modes; deviation
G8B01 What receiver stage combines a 14.250 MHz input signal with a 13.795 MHz oscillator signal to produce a 455 kHz intermediate frequency (IF) signal?
G8B02 If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver?
G8B03 What is another term for the mixing of two RF signals?
G8B04 What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
G8B05 What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?
G8B06 What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?
G8B07 What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
G8B08 Why is it important to know the duty cycle of the mode you are using when transmitting?
G8B09 Why is it good to match receiver bandwidth to the bandwidth of the operating mode?
G8B10 What is the relationship between transmitted symbol rate and bandwidth?
Group G8C Digital emission modes
G8C01 Which of the following digital modes is designed to operate at extremely low signal strength on the HF bands?
G8C02 How many data bits are sent in a single PSK31 character?
G8C03 What part of a data packet contains the routing and handling information?
G8C04 Which of the following describes Baudot code?
G8C05 In the PACTOR protocol, what is meant by an NAK response to a transmitted packet?
G8C06 What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR?
G8C07 How does the receiving station respond to an ARQ data mode packet containing errors?
G8C08 Which of the following statements is true about PSK31?
G8C09 What does the number 31 represent in "PSK31"?
G8C10 How does forward error correction (FEC) allow the receiver to correct errors in received data packets?
G8C11 How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?
G8C12 Which type of code is used for sending characters in a PSK31 signal?