Do you get the same effect with the coins in a cloth bag or a paper bag?
Has anybody tried it?
Lou
At 10:57 AM 3/15/99 -0600, you wrote:
Douglas,
I have seen similar events in a different way. Years ago, I helped design
an electronic system using plastic chassis with nickel surface plating.
Amund:
I think you have forgotten one aspect: the business aspect. The strict,
arcane, and constantly changing european specs artificially create business
for testing labs (like us). It is no coincidence that the specs were written
by representatives of the European Laboratories. (God bless them!
Doug,
Despite the sampling window, the spectrum analyzer has a wide open
front end. It is easily saturated by broadband signals, even though you
think you are only looking at say, 100 to 200 MHz, the front end amplifiers
see everything.
A lot of things have a piezoelectric effect,
Ed, now THAT is a good one. it should win.
It's not that unusual though. It happens quite often just like you said,
specially the part about the VP getting promoted. The tester gets blamed if
the room fails. They dont want you to find leaks, they want you to do
something and then write a report
Hello members!
Well, as long as we are all trading emc horror stories I might as
well pitch in. I have a pretty good one.
Just before the launch of Apollo 11 [the first manned moon landing]
NASA discovered a big emc problem: something was causing the fuel cells of
the command
Members:
We have closed our egroup
electromagneticcompatibil...@egroups.com
and we apologize for the strange ads that were automatically appended by the
service. They were not approved by TEMPEST INC.
Regards,
Louis T. Gnecco, M.S.E.E., President
TEMPEST INC.
-
This
Members:
1.You may want to take a look at our egroup:
electromagneticcompatibil...@egroups.com
to subscribe you send an e-mail to:
electromagneticcompatibility-subscr...@egroups.com
to quit, you send an empty email to:
Group:
What happened to all the emc discussions? I got off the system for a
while, and now its all product safety. Did the emc people start their own
separate group?
Lou G.
---
This message is from the IEEE EMC Society Product Safety
Technical
Sen. McCain is on the committee that oversees NASA. He recently said that
the basic problem is poor management. IMHOP he's right.
lou
At 02:41 PM 3/30/2000 -0500, you wrote:
Tony,
I don't think it was actually EMC. The report I saw on CNN said the legs
opened with a jolt, fooling the sensors
Im with Dave. it is getting too cumbersome. we are going to have to split it
up eventually.
Lou
At 03:51 PM 3/28/2000 -0500, you wrote:
Average number of messages is now between 30 and 50 a day. And people want
more! I wish I had enough free company time to participate in this mountain
of
To all who replied:
Thanks for the quick and hearty responses!
I certainly agree that the world does not need another artificial
language like esperanto.
Some people are better at languages than others, though, and i have
seen some very good engineers having to really
Group:
Having subscribed to this group for over a year now, I am really
impressed by how easily we hold technical bull sessions with emc
engineers from all over the world. This is a fabulous service of the ieee.
There is only one problem with it: ya gotta speak english.
If an
Group:
Yesterday the US Dept of Commerce held a meeting regarding the EMC
annex of a Mutual Recognition Agreement being worked out between the US and
the european union. The idea is to work out procedures where american emc
labs will be recognized by the europeans as full-fledged
Arun:
I heartily agree with everything you said. Well done!
It will not be easy to sell this idea to the emc world.
When the standards are vague, acane and constantly-changing, and when it is
unnecessarily expensive to set up and perform a test, this constitutes what
is known in
Group:
I want to make sure I did this right.
I was trying to determine the permeability of this material.
The B-H curve shows Flux density B in Teslas. (1 tesla = 10,000 Gauss, )
But the Field Strength H is in A/cm. How do I convert this into
something I can use
David,
The best one that is generally available to the public is still
MIL-STD-285.
It is available from the us govt's DODSSP: dept of defense single
source point, in philadelphia.
http://www.dodssp.daps.mil/
.
The IEEE has a standard 299, but in my humble opinion
Don, scott has a good point: if you use a single point grount you might as
well use an isolation transformer to put the room on its own ground. This is
a great way to set up yur room, but it can lead to the problems scott
mentioned and one other big one:
if your room is on its own ground (i.e.
Group,
There is actually a precedent for all this. It is called an
Inter-Library Loan and librarians do it all the time, including corporate
librarians. It works like this:
I need a document, say a EUROPEAN STANDARD. Your Company Library has
it. I ask my librarian to ask your
-Original Message-
From: Muriel Bittencourt de Liz
[SMTP:mur...@grucad.ufsc.br] mailto:[SMTP:mur...@grucad.ufsc.br]
Sent: Thursday, October 07, 1999 5:43 AM
To: Lista de EMC da IEEE
Subject: broadband narrowband emissions
Group,
I'd like to have a clear definition of
what are
Rick,
We have a copy and you can borrow it. I think that the cost of these
standards is ridiculous, it is totally unjustified, and that we all ought
to circumvent it by informally lending each other copies.
There is absolutely nothing illegal about that.
Regards,
Lou
s At 03:03 PM
Joe: check this web site:
http://europa.eu.int/comm/dg03/directs/dg3d/d1/eleng/index.htm
it's all there. click on emc, then click on slim.
bottom line: they are going to review the emc directive. ( no surprise there.)
Lou
George:
It's OK to tell them I sent it. They must be pretty tired of hearing
me talk about this by now, anyway.
The thing is, our military services did not have a hidden agenda.
They needed to produce clear, enforceable standards for a very important
reason: to keep american kids
it at no charge. We
already have some good ones, so take a look!
regards,
Lou Gnecco
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: unsubscribe emc-pstc (without the
quotes). For help, send mail
Group: A comment on the old hp 141T series of spectrum analyzers, that
someone (probably someone like me) recently suggested:
We have some and I like them, BUT:
a) They are no longer supported by hp and some of the parts are no longer
even available.
b) If you are going to get one, you'd
Vitaly,
Actually it is the other way around. As a former bureaucrat, must
is definitely clearer. In the US government, when something is mandatory,
the term is WILL as in:
the distance will be at least three meters etc. (SEE MIL STD 461)
One of the reasons that that the
has to be demonstrated to the Commission's satisfaction. Not
trivial!
Cheers,
Cortland
== Original Message Follows
Date: 08-May-99 06:39:18 MsgID: 1068-10160 ToID: 72146,373
From: Lou Gnecco INTERNET:l...@tempest-inc.com
Subj: Re: Phase
Cortland:
I wonder how well that cancellation system works as you move the
receive antenna up and down the hoist, and as you rotate its polarization.
You would have to re-adjust the cancellation system every step of the way.
This sounds like a lot of work. It would be simpler to
Mr. Montrose is basically one of our competitors, but I have to say that his
articles have been excellent.
Lou
At 07:39 AM 5/7/99 -0600, you wrote:
In all fairness, I have this book and have also taken the class from Mr.
Mark Montrose. I found the class extremely interesting and very useful.
Randall:
Please be sure to include our web site:
http://www.tempest-inc.com
and specially our EMC SUPPLIERS DIRECTORY:
http://www.tempest-inc.com/suppliers.htm
Listing in our directory is absolutely free, so it is a very
complete one. We would like to
Jim,
the noun for one who shleps is also shlep
I don't know why, but as one who grew up in new york city, i can assure you
that this is so. that is why you wont find shlepper
maybe for the same reason that the plural for bagel is also bagel
1 bagel, 2 bagel, N bagel ( lim as n-
It's always a good idea to get a spectrum analyzer some antennas and do a
site survey before you build either the OATS or the shielded room. Knowing
what the ambients are in advance can save you a lot of trouble and money in
both cases.
It makes sense, but hardly anyone does it. why?
to SHLEP all the way to the third floor just to use the bathroom.
The bus stop is a five block SHLEP from here.
That poor SHLEP just got assigned to the EMC group.
Best Regards
Lou Gnecco
TEMPEST INC.
HERNDON VIRGINIA
(a native New Yorker)
At 03:37 PM 5/3/99 -0700, you wrote:
Ed,
I'm not familiar
Brent,
When i worked for NASA we also had water moccasins. They liked to get in the
cable trays and snuggle up next to the RG-9 coax cables, which were
indistinguishable from them.
Those snakes were highly poisonous and very aggressive. They were also BIG.
they could strike clear across the ( 1
Group,
The Armed Forces Communications-Electronics Association (AFCEA)
has some great courses on building, moving, testing, and managing shielded
rooms. Call Ann Beckham at 703-631-6100 for a flyer.
These courses are unclassified, so any one can attend. The
instructor is very
Kim,
Try Caddell-Burns in new york. Look under filters in our EMC
suppliers directory:
http://www.tempest-inc.com/suppliers.htm
Lou
At 11:43 AM 4/20/99 +0200, you wrote:
Hi groupe
I'm tryimg to find an inductor for load test of a LAN circuit (10/100Base
UTP). Do anyone know a
Group:
Here is a typical example of what is wrong with those european
standards. Question: If you bought a TV set, turned it on, and it started to
smoke, wouldn't you consider that a failure?
I dont know what they do in europe, but here in america we would
return it and get our
Richard,
The Headquarters of the European Commission is here in Washington
DC, it is easy to get to during the day, with plenty of parking on the
street. The people there are pretty helpful will give you free copies of
the right documents like 89-336 EEC ( documents that some services
Harry:
Check out westbay emc software. We use it. for a description and free
downloads see:
http://www.tempest-inc.com/software.htm
Lou
At 10:51 AM 4/8/99 -0700, you wrote:
Where can I get ferrite bead SPICE models in the 1Mhz to 100Mhz range. I
desire something simple that can
Ravinder:
Try caddell-burns in New York
Also check our supppliers directory:
http://www.tempest-inc.com/suppliers.htm
Lou
At 03:22 PM 4/2/99 -0700, you wrote:
Hi,
I am looking for a 10 uH power inductor for a power supply design, with
minimum 3 A current rating. The critical requirement is
Kevin:
Check under Antennas in our suppliers directory:
http://www.tempest-inc.com/suppliers.htm
Lou
At 05:19 PM 3/26/99 +0200, you wrote:
Hello Everyone,
I am looking for a manufacturer who supplies a reference discone for
measurements in the GSM bands.
Could someone please
John,
We occasionally solve wiggly monitor problems for customers in the
washingotn dc area. If he is adjacent to a power transformer, and his tv is
wiggling, he is probably getting about 300 milligauss of magnetic field
strength. This is a lot, and would not be advisable for a pregnant
Ed, Good work. Thanks! you have answered a lot of questions, but get this:
The spectrum that you measured is not just a function of the emission from
the baggies, it is also a function of your antenna, which was cut for 300 MHz.
The fact that you still had a 35 dB signal to noise ratio at 1 GHz
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