The highest point in Weihai has an altitude of 200 meters.
The highest elevation in Incheon does not exceed 50 meters.
Given a distance of 400 kilometers, it's highly unlikely that the 'u' segment will be viable.
The signal travels in a straight line, but over distances of more than 40 kilometers, it is affected by the curvature of the Earth. This only occurs when the altitude is high enough. However, neither of these locations has an altitude that is high enough to cause this effect.
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On July 25th, I successfully connected with the repeater in Emeishan and Chongqing (a distance of 280 kilometers).
The elevation at the mountain's waist is 2200 meters, and the summit elevation is 3000 meters. The QuanSheng UVK1 has a power output of approximately 3 watts (medium) and 6 watts (high), with all signals registering as 59.
The Yongquan repeater has an altitude of 700 meters.
When the altitude drops to around 1000 meters, communication becomes impossible.
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