I completely agree with Ken Javor. Solid theory and solid conclusions.
Dave Cuthbert
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Thursday, February 20, 2003 4:53 PM
To: pwell...@csw.l-3com.com; 72146@compuserve.com; emc-p...@ieee.org
Subject: Re: RE02 cabling problem
It's been a long time since I did military-style testing -- TEMPEST in the
1980's -- but it seemed to me then that no great care was taken to control
cable common-mode impedance. The environment INSIDE the chamber was as
unrealistic as one might care to get, and no attempt was made to control or
: RE02 cabling problem
Philip Ross Wellington wrote:
I do not recommend that you use heavy filtering at the chamber egress
wall
to control emissions for a couple of reasons...
Valid statements. However, it's necessary to control chamber ingress,
otherwise the test would
Subject: Re: RE02 cabling problem
I was looking over Dries' post again and note that I overlooked something
important: He says that short shield goes on the *wall plate* -- which I
presume to be the shielded room wall. This doesn't change my recommendation
he test with unshielded wires
-3 Communications CSW
From: Cortland Richmond [mailto:72146@compuserve.com]
Sent: Wednesday, February 19, 2003 7:33 PM
To: ieee pstc list
Subject: RE: RE02 cabling problem
Philip Ross Wellington wrote:
I do not recommend that you use heavy filtering at the chamber egress
wall
to control
:25 PM
To: neve...@attbi.com; ieee pstc list
Subject: Re: RE02 cabling problem
I was looking over Dries' post again and note that I overlooked something
important: He says that short shield goes on the *wall plate* -- which I
presume to be the shielded room wall. This doesn't change my
I was looking over Dries' post again and note that I overlooked something
important: He says that short shield goes on the *wall plate* -- which I
presume to be the shielded room wall. This doesn't change my recommendation
he test with unshielded wires. But it serves as a reminder that support
Dries, it sounds very much as if that short shield is acting as a
(low-value) bypass capacitance. If, as you say, no shield is permitted,
then your customers will audit with no shield, and the product will fail no
matter what tricks you used to get around failure in your own tests.
Then you will
I'm measuring RE02 according Mil Std 461C.
the Standard says that 'signal cables' have to be at least 2meters long lay
and on the table.
My cables are twisted pairs and not allowed to be shielded. Around 30MHz I
get hugh outages.
The total cable length is 3 meters (this length is only chosen to
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