SUBELEMENT T1 – FCC Rules, descriptions and definitions ...



T3A02Why might the range of VHF and UHF signals be greater in the winter?A. Less ionospheric absorption B. Less absorption by vegetation C.?Less solar activityD. Less tropospheric absorptionT3A05When using a directional antenna, how might your station be able to access a distant repeater if buildings or obstructions are blocking the direct line of sight path?A. Change from vertical to horizontal polarizationB. Try to find a path that reflects signals to the repeaterC. Try the long pathD. Increase the antenna SWRT3A08Which of the following is a likely cause of irregular fading of signals received by ionospheric reflection?A. Frequency shift due to Faraday rotationB. Interference from thunderstormsC. Random combining of signals arriving via different paths D. Intermodulation distortion T3B02What property of a radio wave is used to describe its polarization?A. The orientation of the electric fieldB. The orientation of the magnetic fieldC. The ratio of the energy in the magnetic field to the energy in the electric fieldD. The ratio of the velocity to the wavelengthT3B05How does the wavelength of a radio wave relate to its frequency?A. The wavelength gets longer as the frequency increasesB. The wavelength gets shorter as the frequency increasesC. There is no relationship between wavelength and frequencyD. The wavelength depends on the bandwidth of the signalT3B08What are the frequency limits of the VHF spectrum?A. 30 to 300 kHzB. 30 to 300 MHzC. 300 to 3000 kHzD. 300 to 3000 MHzT3C02Which of the following is an advantage of HF vs VHF and higher frequencies?A. HF antennas are generally smallerB. HF accommodates wider bandwidth signalsC. Long distance ionospheric propagation is far more common on HFD. There is less atmospheric interference (static) on HFT3C05Which of the following effects might cause radio signals to be heard despite obstructions between the transmitting and receiving stations?A. Knife-edge diffractionB. Faraday rotationC. Quantum tunneling D. Doppler shiftT3C08What causes tropospheric ducting?A. Discharges of lightning during electrical stormsB. Sunspots and solar flaresC. Updrafts from hurricanes and tornadoesD. Temperature inversions in the atmosphere ................
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