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What is the frequency at which tropospheric scatter occurs?

(a) Above 30MHz

(b) Below 30 MHz

(c) < 3MHz

(d) > 3 MHz and < 30MHz

I had been asked this question in unit test.

My question is from Space Wave Propagation topic in chapter Space Wave Propagation of Antennas

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Right option is (a) Above 30MHz

Easiest explanation: Tropospheric scatter is also known as forward scatter propagation. It occurs at a frequency above 30MHz. It belongs to the UHF and microwave range.

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