On 6/8/2013 10:03 PM, Larry Benko wrote:
Pin 1 problems can cause RFI but I don't think they are a major cause
compared to common mode cable currents and large differential cable
currents which get partially converted to common mode currents via
imbalance. I don't believe that FCC Part 15 specifically tests
susceptability but many other standards do.
Although this is a topic for a different email reflector, I strongly
suspect that Pin One Problems are a major cause of egress, including,
for example, CATV cables. We know that all passive networks work in both
directions, although their transfer ratios may be different, depending
on both internal and external impedances. Any Pin One Problem that lets
RF into the box is likely to let RF out of the box if there is a source
inside.
And you're correct, there is, as far as I know, no FCC requirement for
testing with cables attached, nor for much below 30 MHz. I hear from my
AES Standards colleagues in the UK that their EMC regulations ARE slated
to begin requiring compliance of complete systems (that is, with
interconnections). That would be a VERY good thing.
73, Jim K9YC
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