Extra Class
The highest level of amateur radio license with full operating privileges on all amateur bands. Most technical exam. 50 questions, 37 needed to pass.
Which of the following ensures that a crystal oscillator operates on the frequency specified by the crystal manufacturer?
Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?
What technique shows that a square wave is made up of a sine wave and its odd harmonics?
Which of the following is a type of analog-to-digital conversion?
Which of the following describes a signal in the time domain?
What is “dither” with respect to analog-to-digital converters?
What is the benefit of making voltage measurements with a true-RMS calculating meter?
What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal?
What determines the PEP-to-average power ratio of an unprocessed single-sideband phone signal?
Why are direct or flash conversion analog-to-digital converters used for a software defined radio?
How many different input levels can be encoded by an analog-to-digital converter with 8-bit resolution?
What is the purpose of a low-pass filter used at the output of a digital-to-analog converter?
Which of the following is a measure of the quality of an analog-to-digital converter?
What is the modulation index of an FM signal?
How does the modulation index of a phase-modulated emission vary with RF carrier frequency?
What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?
What is the modulation index of an FM phone signal having a maximum carrier deviation of plus or minus 6 kHz if the highest modulating frequency is 2 kHz?
What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 5 kHz if the highest modulation frequency is 3 kHz?
What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 7.5 kHz if the highest modulation frequency is 3.5 kHz?
Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?
HAM Test Bank Editorial Team
Licensed Amateur Radio Operators & Volunteer Examiners
Content for Extra Class exam questions is based on official FCC Part 97 regulations and the NCVEC question pool.