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This is the first castle keep inside the Norman castle (the other ruins next to it are 50 years later or so), and it has a defensive ditch around it. For if attackers got inside the motte. Which has a defensive ditch separating it from the bailey. Which is surrounded by about 3 more levels of earthworks and ditches. Yeah, this really feels a little unnecessary...
Multiplier section
Full description & analysis: www.eevblog.com/forum/rf-microwave/interesting-unusual-rf...