Question

Find the MUF for the wave operating at a critical frequency 6MHz and having the skip distance d as 25km and virtual height of 100km in the ionosphere layer.

(a) 6.05MHz

(b) 1.25MHz

(c) 1.025MHz

(d) 3.25MHz

The question was asked in an internship interview.

The doubt is from Maximum Usable Frequency in section Virtual Height, Critical Frequency and Muf of Antennas

Answer 1

Correct answer is (a) 6.05MHz

Easy explanation: \(f_{MUF}=f_c \sqrt{((\frac{d}{2h})^2+1)}=6×10^6×\sqrt{((\frac{25}{2×100})^2+1)}=6.05MHz\)