![]() No longer did we have to study the ionosphere or calculate what frequency would work. The feeling was, "HF is dead." People were eager to switch to satellites because of the simplicity of operations. The advent of communications satellites in the late 1960's and early 1970's brought a change of philosophy about long-distance communications. Throughout the 1950's and 1960's HF sky-wave systems were was the backbone of our long-distance communication. We've been using high-frequency (HF) communications for many years. ![]() Again, we'll examine wave propagation and limitations on the use of these frequency bands. ![]() Next, we'll look at the lower frequency bands and the upper frequency bands. We'll also examine HF engineering ideas, limitations on the use of HF, and satellites and their effect on HF communications. Specifically, we'll cover examine HF wave propagation, the ionosphere, and its effects on propagation. Since HF is the primary mode of our communications we'll look at it first. ![]() N this unit we'll examine discuss specific aspects of radio communications across the radio-frequency band of the electromagnetic spectrum. Ionospheric variables related to communicationsĤ16.
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