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What is the value of maximum usable frequency when the incident angle is 60° and the critical frequency is 4.5MHz?

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What is the value of maximum usable frequency when the incident angle is 60° and the critical frequency is 4.5MHz?

(a) 4.5MHz

(b) 2.25MHz

(c) 9MHz

(d) 18MHz

The question was asked in my homework.

The query is from Maximum Usable Frequency topic in chapter Virtual Height, Critical Frequency and Muf of Antennas

1 Answer

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Right answer is (c) 9MHz

The explanation is: MUFfMUF = fcsecθi = 4.5MHz ×sec60=9MHz.

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