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Sometimes deep fades will last for half a minute or more, causing program interruption or important messages to be lost.
Besides fading, other phenomena occurs when radio waves are refracted through the ionosphere, such as selective sideband fading causing distortion on AM signals along with rotation of the radio waves causing polarization changes. Peterson, began investigating what was actually happening when signals faded.
As a transportation center, it was the site of an early engagement in the Korean War, the Battle of Cheonan.
Diversity receiving equipment utilizes two or more receivers connected together at the second detectors and AVC lines.
as it is the gateway to the area around the national capital region and western Chungcheong, as well as the main transportation hub for the national road (Hwy 1, 21), railways, and expressways (IC 1-Gyeongbu Expressway, 25-Honam Expressway).
It is the place where Samnamdaero, which starts in Seoul, parts, leading one branch of the road through to the south-eastern Yeongnam region (which includes Gimcheon, Daegu, Gyeongju and Dongnae), and leading the other through Gongju and Nonsan to the Honam region (which includes Jeonju, Gwangju, Suncheon, and Yeosu).
Due to its strategic location, Cheonan has also been an important postal center where early communications from the south converged before heading to Seoul, or where messages from the capital diverged into the southern regions.
At the Korail station in the downtown center, the Gyeongbu Line crosses north to south, and the Janghang Line extends to the south-west.
It is also part of Seoul Subway Line 1 and the KTX.