"Robert Kubichek" ha scritto nel messaggio
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It also might be a pass filter, seeing that it has no grounding point.

Bob N9LVU

Hello Bob,
well there is a "maybe" grounding point on the BNC connector side .
There is a big screw on the connector himself with a big washer, is suppose
it's the grounding point.

73 de Riccardo IK5WQO