A lower pitch can be benficial because the same absolute frequency
difference between two CW signals is perceived different at a different
pitch.
Two signals 40 Hz apart are much easier seperated at a pitch of 400 Hz than
at a pitch of 800 Hz. At 800 Hz the difference is 5%. At 400Hz it is 10 %.
This is the way our BSP (biological signal processor) handles it.
At LF I have been using a pitch as low as 100 Hz to seperate signals with a
small spacing with excellent results.
73,
Roelof Bakker, pa0rdt
Middelburg, Netherlands
JO11tm
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