Steve Bonine wrote:
In the absence of any data, I'm not going to speculate about whether 40%
is a reasonable number. Have there been any attempts at measuring
utilization in an objective way?

How about narrow band modes on the lower 1/3 of a band,
wide band on the upper 1/3, and any mode allowed in the
middle 1/3? It would be interesting to see what happens
in the middle 1/3.
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73, Cecil http://www.w5dxp.com