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Brian Fury asked: >>I am looking for assistance in determining EMI/EMC
requirements for analog cellular systems (eg AMPS) that employ co-located
radio transceivers and computer based control equipment. Of particular
concern is the situation when the control equipment is located in the same
equipment cabinet (rack) as the transceiver equipment.
Issues are:
1. In situations (such as cellular networks) what is the precedence
between specific system standards (eg EIA/TIA-IS-20) and FCC emission
regulations (eg 15.207, 15.209) ?
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FCC issues technical regulations, which are the law of the land.
TIA issues a number of products, which when generated are voluntary
standards.
EIA/TIA-IS-20 is an "interim standard". Won't go into the why's and when's
here
but an IS is not American National Standard and you comply with it because
it is good business to do so. There have been instances where the FCC has
grabbed a TIA standard and read it into the FCC Rules and Regs, but this is
not one of those instances.
FCC has been accepting compliance with CISPR 22 criteria in lieu of
compliance with Part 15 of the FCC Rules and Regs, provided you measure it
the American way.
As to what configuration you measure ?? The Rules and Regs, purposely,
are not written in a prescriptive way, so people can use their noodles. It
is up to you to satisfy yourself and your customer that this gadget won't
cause trouble. Some people have experience in that, but the development
thereof was an investment.
The good ones probably would want to get paid for telling you exactly what
to do.
Ciao,
Vic
