To radiate signals with high efficiency, the antennas should have a size comparable to the wavelength???of the signal (at least??4)
115) To radiate signals with high efficiency, the antennas should have a size
Answer is:
comparable to the wavelength???of the signal (at least??4)
Explanation:
Related Electronic Devices and Communication MCQ with Answers
Answer is:
attenuates the radiated signal as a result of energy absorption by it
Explanation:
Ground Wave propagation?is a method of radio frequency?propagation?that uses the area between the surface of the earth and the ionosphere for transmission. Theground wave?can?propagate?a considerable distance over the earth's surface particularly in the low frequency and medium frequency portion of the radio spectrum.
Answer is:
VLF few MHz
Explanation:
Ground Wave propagation?is a method of radio frequency?propagation?that uses the area between the surface of the earth and the ionosphere for transmission. Theground wave?can?propagate?a considerable distance over the earth's surface particularly in the low frequency and medium frequency portion of the radio spectrum.
Answer is:
reflects the radiated signal
Explanation:
n radio communication,?skywave?or skip refers to thepropagation?of radio?waves?reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
Answer is:
few MHz up to 30 to 40 MHz
Explanation:
The?sky waves?are the radiowaves of frequency between 2 MHz to 30 MHz. These radio waves canpropagate?through atmosphere and are reflected back