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Radio Extra Class 1 Flashcards

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

Read the first 6 Radio Extra Class 1 flashcards as text

  1. What is the input impedance of a quarter-wavelength transmission line section terminated with a short circuit?

    Answer: Infinite impedance (open circuit)

    A quarter-wave transmission line acts as an impedance inverter. A short circuit (0 Ω) at the far end appears as an open circuit (infinite impedance) at the input, and vice versa. This property is widely used in antenna matching networks and stub filters.

  2. Which filter design exhibits a maximally flat amplitude response throughout the passband, sacrificing roll-off steepness to eliminate ripple?

    Answer: Butterworth

    The Butterworth filter is specifically engineered for a 'maximally flat' passband — no ripple whatsoever. Chebyshev and elliptic filters achieve steeper roll-off at the cost of introducing passband or stopband ripple, while the Bessel filter prioritizes linear phase response.

  3. What is the lowest frequency in the 80-meter band at which an Extra class licensee may operate single-sideband phone?

    Answer: 3.600 MHz

    FCC Part 97 grants Extra class licensees phone (including SSB) privileges beginning at 3.600 MHz on 80 meters, extending to 4.000 MHz. General class phone begins at 3.800 MHz, so Extra class has an additional 200 kHz of exclusive phone spectrum in the lower portion of the band.

  4. What does a receiver's third-order intercept point (IP3) specification describe?

    Answer: The theoretical input power level at which third-order intermodulation products equal the fundamental signal amplitude

    IP3 is a figure of merit for receiver linearity. It is the extrapolated input power where the third-order intermodulation products would theoretically reach the same level as the desired signals. A higher IP3 means the receiver handles strong nearby signals with less intermodulation distortion, which is critical in crowded band conditions.

  5. What is the approximate forward gain of a well-designed three-element Yagi antenna referenced to an isotropic radiator?

    Answer: 7 dBi

    A three-element Yagi (driven element, reflector, and one director) typically achieves approximately 7 dBi (about 5 dBd) of forward gain. The reflector adds gain and improves front-to-back ratio, while the director narrows the forward lobe and boosts gain further.

  6. What propagation advantage does operating during the 'greyline' provide for HF amateur radio communication?

    Answer: Both ends of the path can simultaneously experience an absent D layer while the F layer remains ionized, enabling strong low-noise long-path signals

    The greyline is the twilight terminator where day meets night. The D layer, which absorbs lower HF frequencies during daylight, is absent at twilight, while the F layer remains charged. When both the transmitting and receiving stations are simultaneously on or near the greyline, long-distance low-band propagation can be exceptionally strong with minimal absorption.