Primitive radio receiver

The crossword puzzle clue today is "Primitive radio receiver". To solve this puzzle clue, we look for the similarity crossword puzzle definitions for our clue. Below are the possibilities crossword solution and answer for "Primitive radio receiver".

Primitive radio receiver :

The “coherer” was one of the first devices used to detect a radio signal. It consists of a glass tube with an electrode at either end, and metal filings in between those electrodes. In the presence of a radio wave, the metal filings “cohere”, causing a measurable change in the resistance between the electrodes.

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Primitive radio receiver | mike | 4.5

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