How does VHF/UHF propagate beyond the expected (radio) horizon?

7yr ⋅

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Why do some straight keys have a slider that shorts the contacts continuously?

7yr ⋅

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What's this crossover toroid winding called and what is its purpose?

9yr ⋅

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How to calculate if low-pass filtering is sufficient?

8yr ⋅

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How should this SWR meter's directional coupler work?

8yr ⋅

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