I hold with the 3 db under class B, as well as A. The only effective
argument, in my mind, is the uncertainty of measurement issue. Beyond that I
find that if I have 3 db everywhere my measurements next time down with that
product or with one off the shelf have also been compliant. So if pragmatic
repeated measurements is telling me I'm in then I am not going to spend the
time and money to make even more sure that I am in. The goal is to not
interfere with communications not to be invisible at all costs. If it ain't
broke I'm not fixing it.
Obviously, others disagree. By the way if a customer requests it, they
get what they want, if they want to pay for it, and I have never rejected
products with a 3 db band - and they haven't bitten me yet either.
My couple cents
Gary
-----Original Message-----
From: Doug McKean [mailto:[email protected]]
Sent: Monday, December 17, 2001 3:15 PM
To: EMC-PSTC Discussion Group
Subject: Re: EMI guard bands
"Tania Grant" wrote:
>
> Amund,
>
> My minimum criteria and recommendation has always been at least 6dB.
> However, how many engineering managers, upon finding a 1.5 dB margin
in
> their favor, rule "ship it"!
<nod>
Although in some markets, there are customers who
require -6dB under the Class A limit. Although if I had
it my way, I'd make it about -10dB under the limit.
- Doug McKean
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