Electromagnetic Field Theory
MUF is depend upon

Electron density of the ionospheric layer
Received frequency by receiver
Height of ionospheric layer
11 year sun spot cycle

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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

Waveguides can handle large power at UHF and microwaves
At waveguide can be coupled to a coaxial cable
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves

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