On 10/9/2020 10:39 AM, Walter Underwood wrote:
Every time I see one of those plots from the ARRL Lab, I wonder “what is a good
number?” I really wish they would add some additional lines to the graph. One
suggestion:
* FCC regulated limits (where they exist)
* 90th percentile (best 10%) of tests in the previous five years
* Best test in the previous five years
Some of that information is in my summary of ARRL Lab tests.
FCC limits are not expressed well for those who deal only with numbers.
What SHOULD be the dominant paragraph says that the bandwidth of a
signal shall be the minimum required for the means of transmission. In
practical terms, that means carefully shaped CW keying, minimum phase
noise, minimum IMD. It's essentially a "state of the art" spec. But
because there are no numbers attached, the paragraph is widely ignored.
73, Jim K9YC
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