Technician Class License Exam Questions

Subelement T3

Radio wave characteristics: properties of radio waves; propagation modes

Question Display Options:
Group T3A Radio wave characteristics: how a radio signal travels; fading; multipath; wavelength vs. penetration; antenna orientation
T3A01 What should you do if another operator reports that your station's 2 meter signals were strong just a moment ago, but now they are weak or distorted?
T3A02 Why are UHF signals often more effective from inside buildings than VHF signals?
T3A03 What antenna polarization is normally used for long-distance weak-signal CW and SSB contacts using the VHF and UHF bands?
T3A04 What can happen if the antennas at opposite ends of a VHF or UHF line of sight radio link are not using the same polarization?
T3A05 When 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?
T3A06 What term is commonly used to describe the rapid fluttering sound sometimes heard from mobile stations that are moving while transmitting?
T3A07 What type of wave carries radio signals between transmitting and receiving stations?
T3A08 Which of the following is a likely cause of irregular fading of signals received by ionospheric reflection?
T3A09 Which of the following results from the fact that skip signals refracted from the ionosphere are elliptically polarized?
T3A10 What may occur if data signals propagate over multiple paths?
T3A11 Which part of the atmosphere enables the propagation of radio signals around the world?
Back to top of page
Group T3B Radio and electromagnetic wave properties: the electromagnetic spectrum; wavelength vs. frequency; velocity of electromagnetic waves; calculating wavelength
T3B01 What is the name for the distance a radio wave travels during one complete cycle?
T3B02 What property of a radio wave is used to describe its polarization?
T3B03 What are the two components of a radio wave?
T3B04 How fast does a radio wave travel through free space?
T3B05 How does the wavelength of a radio wave relate to its frequency?
T3B06 What is the formula for converting frequency to approximate wavelength in meters?
T3B07 What property of radio waves is often used to identify the different frequency bands?
T3B08 What are the frequency limits of the VHF spectrum?
T3B09 What are the frequency limits of the UHF spectrum?
T3B10 What frequency range is referred to as HF?
T3B11 What is the approximate velocity of a radio wave as it travels through free space?
Back to top of page
Group T3C Propagation modes: line of sight; sporadic E; meteor and auroral scatter and reflections; tropospheric ducting; F layer skip; radio horizon
T3C01 Why are direct (not via a repeater) UHF signals rarely heard from stations outside your local coverage area?
T3C02 Which of the following might be happening when VHF signals are being received from long distances?
T3C03 What is a characteristic of VHF signals received via auroral reflection?
T3C04 Which of the following propagation types is most commonly associated with occasional strong over-the-horizon signals on the 10, 6, and 2 meter bands?
T3C05 Which of the following effects might cause radio signals to be heard despite obstructions between the transmitting and receiving stations?
T3C06 What mode is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?
T3C07 What band is best suited for communicating via meteor scatter?
T3C08 What causes tropospheric ducting?
T3C09 What is generally the best time for long-distance 10 meter band propagation via the F layer?
T3C10 What is the radio horizon?
T3C11 Why do VHF and UHF radio signals usually travel somewhat farther than the visual line of sight distance between two stations?
T3C12 Which of the following bands may provide long distance communications during the peak of the sunspot cycle?
Back to top of page