The Rebirth of High Frequency

<img src="https://spectrum.ieee.org/media-library/rohde-schwarz-logo-with-slogan-make-ideas-real-and-rs-monogram-in-diamond.png?id=67100960&width=980"/><br/><br/><p>An examination of how satellite vulnerabilities, modern wideband waveforms, and automatic link establishment are driving renewed military and government investment in HF communications.</p><p>What Attendees will Learn</p><ol><li>Why HF (High Frequency) declined — and what has changed — How satellites overtook HF for global communications from the 1970s onward, and why growing awareness of satellite vulnerabilities to anti-satellite weapons, jamming, solar storms, and coverage gaps is reviving interest in skywave propagation as a resilient alternative.</li><li>How the ionosphere enables and limits global HF communication — Understand the roles of the D, E, and F ionospheric layers in refracting and absorbing signals, the concepts of maximum usable frequency (MUF) and lowest usable frequency (LUF), and how sunspot number, solar flux index, and A/K geomagnetic indices are used to quantify and predict propagation conditions.</li><li>How automatic link establishment transforms HF operability — Trace the evolution from proprietary first-generation ALE through interoperable second- and third-generation standards to fourth-generation wideband ALE, which automates frequency selection, link setup, and adaptation to changing channel conditions — removing the dependency on highly skilled operators.</li><li>How wideband HF is closing the throughput.</li></ol><div><span><a href="https://content.knowledgehub.wiley.com/the-rebirth-of-high-frequency/" target="_blank">Download this free whitepaper now!</a></span></div> Reference: https://ift.tt/oCEnqL0