You can be perfect or nearly perfect if all you do is S&P. You can
listen to previous QSOs and later QSOs all you want until you are sure
of what you are logging. If you do any amount of running, perfection is
not likely if you make a lot of QSOs. If for no other reason, the other
station will send you wrong information, including his call, and not
correct it.
You do the best you can. Some contests (NA Sprints and NAQCC) recognize
"Golden Logs."
3 or 4 % error rate is good for a "run" station. It should be much
better for a S&P operator. For multi ops, the rates go way up and it
isn't uncommon to have 10%+ error rate.
Keep in mind that if you look at score reductions, there will often be
some "penalty" deductions included, usually only for Not in Log QSOs.
Run stations get NIL reports when someone calls a nearby station and the
timing is right and that station never calls you. You log the station,
but he actually worked somebody else. Almost impossible to avoid that
happening sometimes.
73, John, K4BAI.
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