T3A - Radio wave characteristics
Technician Class
Radio wave characteristics: how a radio signal travels, fading, multipath, polarization, wavelength vs absorption; Antenna orientation
12 questions
Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?
What is the effect of vegetation on UHF and microwave signals?
What antenna polarization is normally used for long-distance CW and SSB contacts on the VHF and UHF bands?
What happens when antennas at opposite ends of a VHF or UHF line of sight radio link are not using the same polarization?
When using a directional antenna, how might your station be able to communicate with a distant repeater if buildings or obstructions are blocking the direct line of sight path?
What is the meaning of the term “picket fencing”?
What weather condition might decrease range at microwave frequencies?
What is a likely cause of irregular fading of signals propagated by the ionosphere?
Which of the following results from the fact that signals propagated by the ionosphere are elliptically polarized?
What effect does multi-path propagation have on data transmissions?
Which region of the atmosphere can refract or bend HF and VHF radio waves?
What is the effect of fog and rain on signals in the 10 meter and 6 meter bands?