Thank you, Hans, for this bit of history. That would explain the FCC
'easier' limits that are only designed to protect civilian
communications and not military.
Tania Grant, Octel Communications Corporation
[email protected]
______________________________ Reply Separator _________________________________
Subject: Re: Re[4]: Shiep rules
Author: [email protected] at P_Internet_Mail
List-Post: [email protected]
Date: 1/8/97 5:00 PM
ok,ok, let's not forget how the original EMC rules got about. I heard, long ago,
that during the cold war, certain listening posts had difficulty in receiving
eastern european intelligence due to a german automobile factory which was
causing enough interference to drown out the siganls. So, the VDE rules were
born and were the first ones out. Then came CISPR 22 etc., etc.. That may be
considered political but it was more out of a military intelligence point of
view that EMC rules were born. Similarly, TEMPEST design rules were born when
the French discovered that the British were listening to their power lines at
the french embassy in UK and decoding their teletype transmissions!!! (in the
1950's!)
Best Regards
Hans
______________________________ Reply Separator _________________________________
Subject: Re[4]: Shiep rules
Author: Non-HP-owner-emc-pstc ([email protected]) at
hp-boise,uugw2
List-Post: [email protected]
Date: 01/07/97 01:26 PM
Chris,
>> Here my natural cynicism comes out...
In this business we all get cynical.
>> The reduction in Electronic Fog in our universe is a secondary effect
Here we disagree. CISPR-12 was based on actual interference tests using real
people as subjects. The standard, which was essentially adopted as EN 55022,
is based on technically relevant factors, not politically relevant ones.
>> authorities would get far more excited if goods with CE marks were
>> stopped at a border, than if the goods made too much EMI.
It depends whose authorities. For example, if the computing equipment
concerned were to interfere with police radio, I imagine there would be a
sufficiency of excited authorities, even _with_ the CE mark.
>> There's a few centimes/Deutchmarks worth...
Euro's. (Or is that Euro's d'Or?)
Cortland
As usual, the above does not reflect opinions or policies of my employer.
