Anon, Please capitalize and punctuate correctly, at least try. After all this is an English forum. Past perfect use is absolutely correct here because a captain's log is the record which detailed many events as they happened in the past that that we are reading at the present.
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Anonymoushello, terribly sorry for [the] lack of ponctuation and capitalisation.
So if I understand clearly your answer:It means that
Anonymouswhy it is not written had transcribed as both actions picked up and transcribed happened before the log was sent .
We had picked up a distress signal some weeks back , the call letters unclear, but seemingly emitted from a slow & hostile planet known only as URP. The data transcribed