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Rick, thanks for providing the test points. I have more questions than comments (probably the general response to someone that has just done a pot load of work). I notice that the tests indicated that your transmitted voltage levels of about 50 - 70 db above a microvolt caused the radiated emission to fail class B by about 30 to 50 dB, depending on the data point. We all know that there is very loose coupling between power on the lines and radiated power, since there is som much that is dependent on geometry. However, you have created a nice stake in the ground.
Based on the measurements you have made, would you care to make any very rough estimates of the power levels that might cause radiation problems, and how those same power levels would impact noise. I would dearly love to be able to bound the problem of how much noise might be transferred to the signal lines from powering the signal pairs, and was wondering if you have any insights that might tie some of your measurements back to this problem?
Thanks again for the good work Rick!
Robert D. Love
President, LAN Connect Consultants
7105 Leveret Circle
Raleigh, NC 27615
Phone: 919 848-6773
Fax: 720 222-0900