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DXER Ham Radio DX News

The latest dx news/current propagation and more. Visit mike's Amateur Radio Page at www.qsl.net/swlham

Saturday, July 29, 2017

How the Space Race Gave Us GPS Technology:

Global navigation systems were made possible with the launching of satellites and the Space Age. The history of the Global Positioning System (GPS) began miles above the Earth, going 18,000 mph.

from Ham Radio Times http://ift.tt/2eVQCi4
via IFTTT

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