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screw on coax fittings be a possible cause?
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Yes, if an error was made. Commonly, a strand of the shield gets shorted to the center. Perform a very careful inspection looking for that along with improper stinger length.
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A splitter is a splitter whether it be cable or antenna signal?
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If it's actually a splitter and not a diplexer (reverse channel) or some type of filter.
Best thing to do if nothing shows up from an inspection, is to simply use a known good length of cable and jump around each suspect leg of the cabling until you find the one causing the signal loss.