Its put up or shut up time for me. I claim that CFR 47, ANSI c63.4 and/or CISPR 22 all require compliant peripherals or host systems when they are required as part of the EUT test setup but I can't find the actual paragraphs to demonstrate my point. As I understand the regulations you can make no modifications to support devices, except that which restores them to their original manufactured condition. In other words I have been known to clean mating services, retighten enclosures and shields, but no other modifications. The justification seems fairly simple to me. If you have to modify someone else's equipment there isn't a chance in hell that the manufacturer will implement it just because you say so. Equally important in this argument is that you cannot identify through test identify a non-complying signal as belonging to the support equipment rather than the EUT and then claim compliance. This concept has been stuck in my head for many years, probably dating back to the earliest MP-4 documents and part 15 regulations. I vaguely associate it with the sections that described peripherals to exercise equipment and what was or was not acceptable. I would appreciate some skull scratching here, but preferably can someone provide the FCC/CISPR citation on this point. I have spent an interesting amount of money testing big name devices looking for very quite support equipment. Obviously, I would prefer to win this argument but on the other hand it sure makes the search for peripherals that meet my needs a lot easier. Thanks Gary McInturff
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