Practice Test Geeks(GROL) General Radiotelephone Operator License Practice Test
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Modulation and Signal Types Flashcards

7 cards from real GROL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Modulation and Signal Types flashcards as text

  1. An AM carrier has a peak amplitude of 100V and is modulated at 80%. What is the peak amplitude of each individual sideband?

    Answer: 40V

    Each sideband amplitude equals (m/2) × carrier amplitude = (0.8/2) × 100 = 40V.

  2. An AM transmitter produces 1000W of carrier power. What is the total output power at 100% modulation?

    Answer: 1500W

    Total AM power = Pc(1 + m²/2) = 1000(1 + 0.5) = 1500W at 100% modulation.

  3. What is the RF bandwidth of an AM signal with an audio frequency range of 300Hz to 5kHz?

    Answer: 10kHz

    AM bandwidth = 2 × highest audio frequency = 2 × 5000Hz = 10kHz.

  4. What occurs when an AM signal is overmodulated (modulation index exceeds 1.0)?

    Answer: The carrier is cut off during negative peaks, causing distortion and adjacent-channel splatter

    Overmodulation clips the carrier on negative audio peaks, producing flat-topping that generates harmonics and causes splatter interference on adjacent channels.

  5. An AM transmitter operates on 1600kHz and is modulated by a 4kHz audio tone. Where are the two sidebands located?

    Answer: 1596kHz and 1604kHz

    The upper sideband is at 1600 + 4 = 1604kHz and the lower sideband is at 1600 − 4 = 1596kHz.

  6. What percentage of total AM transmitter power is contained in both sidebands combined at 100% modulation?

    Answer: 33.3%

    Sideband power = Pc × m²/2 = 500W; total power = 1500W; 500/1500 = 33.3%.

  7. Which ITU emission designator identifies a standard double-sideband full-carrier AM voice transmission?

    Answer: A3E

    A3E designates double-sideband full-carrier amplitude modulation used for analog voice telephony.