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not sure about the evc but the AVCR requires the scramble wire, which is orange to be connected to ground on activation. So I have the com connected to ground and N/c connected to scramble. I'm pretty sure the EVC would work the same way, I know it has scramble also. If it's 2 wires instead of one like the avcr you would connect one wire to com instead of ground thats all.
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