Many, many years ago I was involved in the design of a "survivable"
military ComSat system that would provide a low bit-rate channel under
heavy jamming conditions. We set ourselves the target that it should do
as well as a good CW operator under the same S/No conditions. That meant
we had to "measure" the performance of the CW operator.
We took 3 very experienced operators - the sort that copy 25wpm random 5
letter groups whilst doing the Times cryptic crossword at the same time
(I'm not kidding). We gave them the best receivers available at the
time, equipped with a vast array of filters.
I was fascinated as a young engineer to see that they never used the
narrowest filters, however poor the S/No. They rarely went below 1KHz. I
guess they had some pretty narrowband stuff going on in their heads :)
And by the way, the set a pretty tough target to beat!
Steve G3TXQ
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