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I've seen this happen with cable signals. There is a gap in the shield or center conductor where contact is not quite being made. The high channels can jump that gap because of the capacitance across the gap, but the low channels can't.
Redo the splice with two new male connectors and an F81 coupler or replace the cable.
Last edited by rabbit73; 30-Aug-2015 at 3:23 AM.
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