Which frequency will have the least attenuation for long-distance skip propagation?
Just below the MUF✓پاسخ درست
Just above the LUF
Just below the critical frequency
Just above the critical frequency
توضیح
Absorption in the ionosphere's lowest layer falls roughly as the inverse square of frequency, so the highest frequency that the path will still return suffers the least loss. Working just below the MUF also tends to require fewer hops, and each additional hop adds ionospheric and ground-reflection loss.