technique.
--
From: Doug McKean dmck...@auspex.com
To: EMC-PSTC Discussion Group emc-p...@majordomo.ieee.org
Subject: Re: EMI guard bands
Date: Fri, Dec 21, 2001, 10:48 AM
John Woodgate wrote:
I would be suspicious of that; it is a 'near-field' scenario, which
means that the emission field
John Woodgate wrote:
I would be suspicious of that; it is a 'near-field' scenario, which
means that the emission field strengths are complex and impossible
to
calculate. The Class B limits are related to a 10 m separation of
source
and potential victim, and that implies far-field conditions
be a
long way from a broadcast tower.
--
From: John Woodgate j...@jmwa.demon.co.uk
To: emc-p...@majordomo.ieee.org
Subject: Re: EMI guard bands
Date: Thu, Dec 20, 2001, 1:52 PM
I read in !emc-pstc that Doug McKean dmck...@auspex.com wrote (in
006801c18988$24b4a2a0$3e3e3...@corp.auspex.com
I read in !emc-pstc that Doug McKean dmck...@auspex.com wrote (in
006801c18988$24b4a2a0$3e3e3...@corp.auspex.com) about 'EMI guard
bands', on Thu, 20 Dec 2001:
Anywho, the answer I got back from him was that
the limits were empirically derived in reference to
interfering with television
Thanks to all who responded.
Yes, Ralph Showers.
I kept the response from him for the longest time. But,
after several program and hard drive crashes, it's lost.
Thanks again.
Regards, Doug McKean
---
This message is from the IEEE EMC Society
To: EMC-PSTC Discussion Group
Subject: Re: EMI guard bands
Historical bit of news ...
I asked a similar question a couple of years ago here
and was referred to a gentleman who was in the
writing of the original FCC limits. Can't remember
the man's name but he's a professor at Univ. Penn.
if I
Historical bit of news ...
I asked a similar question a couple of years ago here
and was referred to a gentleman who was in the
writing of the original FCC limits. Can't remember
the man's name but he's a professor at Univ. Penn.
if I remember correctly.
Anywho, the answer I got back
and measurements to reflect this difference in sensitivity, but no
action was taken.
--
From: rehel...@mmm.com
To: emc-p...@majordomo.ieee.org
Subject: RE: EMI guard bands
Date: Thu, Dec 20, 2001, 6:03 AM
After listening to this thread, it brings up a question that I have had
over the years
I read in !emc-pstc that rehel...@mmm.com wrote (in
of6c4e54e3.fd742a66-on86256b28.0040f...@mmm.com) about 'EMI guard
bands', on Thu, 20 Dec 2001:
Does anyone have any historical development data or insights into the
creation of limits?
See my direct response to the OP. Even if limits were
I read in !emc-pstc that CE-TEST cet...@cetest.nl wrote (in
nfbbilofgmjcamhepkbaaeglceaa.cet...@cetest.nl) about 'EMI guard
bands', on Thu, 20 Dec 2001:
It's just for a few months now that CISPR/IEC are considering
to implement measurement faults into the required margin.
No, the subject has
...@majordomo.ieee.org]On Behalf Of
douglas_beckw...@mitel.com
Sent: woensdag 19 december 2001 16:50
To: Stone, Richard A (Richard)
Cc: 'Gary McInturff'; Doug McKean; EMC-PSTC Discussion Group
Subject: RE: EMI guard bands
From: Douglas Beckwith@MITEL on 12/19/2001 10:50 AM
Legally you are not required
After listening to this thread, it brings up a question that I have had
over the years regarding limit lines
and passing margins.
Are there EMI guard bands already built into the limit lines?
I find it very difficult to believe that a group of reasonable people
developing a limit line would
, Richard A (Richard) [mailto:rsto...@lucent.com]
Sent: Wednesday, December 19, 2001 7:06 AM
To: 'Gary McInturff'; Doug McKean; EMC-PSTC Discussion Group
Subject: RE: EMI guard bands
Does anyone make Class A AND Class B
products?
if so, do you allow for a much smaller margin on the B
since its approx
To: 'Gary McInturff'; Doug McKean; EMC-PSTC Discussion Group
Subject: RE: EMI guard bands
Does anyone make Class A AND Class B
products?
if so, do you allow for a much smaller margin on the B
since its approx. 10 db quieter than A to start with.
or do you treat them equally.
Also Oats site to Oats
?
Richard,
-Original Message-
From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com]
Sent: Tuesday, December 18, 2001 1:19 PM
To: Doug McKean; EMC-PSTC Discussion Group
Subject: RE: EMI guard bands
I hold with the 3 db under class B, as well as A. The only effective
argument
...@lucent.com
To: 'Gary McInturff' gary.mcintu...@worldwidepackets.com, Doug McKean
dmck...@auspex.com, EMC-PSTC Discussion Group
emc-p...@majordomo.ieee.org
cc:(bcc: Douglas Beckwith/Kan/Mitel)
Subject: RE: EMI guard bands
Does anyone make Class A AND Class B
products?
if so, do
,
-Original Message-
From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com]
Sent: Tuesday, December 18, 2001 1:19 PM
To: Doug McKean; EMC-PSTC Discussion Group
Subject: RE: EMI guard bands
I hold with the 3 db under class B, as well as A. The only effective
argument, in my mind
George
-Original Message-
From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com]
Sent: Tuesday, December 18, 2001 10:19 AM
To: Doug McKean; EMC-PSTC Discussion Group
Subject:RE: EMI guard bands
I hold with the 3 db under class B, as well as A. The only
]
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
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.
...@majordomo.ieee.org
Sent by: cc:
owner-emc-pstc@majordom Subject: Re: EMI guard
bands
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!
Education (repeated brainwashing of as many 'powerful company managers) has
been my response;-- but that often takes
Cecil,
We design our products for -10 dB limit, accept -8 dB for a lab prototype
pre-production) and allow -6 dB for production units. We feel this is not
conservative based on past history of measurement uncertainty and production
variations.
Jim
-Original Message-
From:
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