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Rereading your posts , I see that you said that at one point that you disconnected the Power Injector but left the preamp unit at the antenna connected.
With out power and with out the power injector connected , the preamp will not function.
If the actual preamp unit is not functioning because it has no power for the electronic circuit of the preamp that is out by the antenna , Then the preamp will not pass much if any signal.
With out power the Actual Preamp Unit that is out by the antenna becomes a -->Attenuator<-- and actually stops signals from getting through.
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