Topband: A ham who uses his own weight in ferrites

[Herbert Schoenbohm]

Carl Clawson wrote:
> I stumbled across this article on common mode noise somewhere:
>
> http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
>
> Looking at the extensive choking at this station, I am astounded. For
> example, I've never heard of anyone choking entire mains branches at the
> breaker panel (his Fig. 14). Maybe I just haven't paid enough attention.
> But...
>
>   
The DOD and military have done extensive research on EMP protection for 
command and control facilities so nothing can get in....absolutely 
nothing that they do not want to get in from DC to light.  This practice 
started being extensively deployed during the "cold war" when scientists 
learn that higher altitude detonation from nuclear devices could enter a 
facility and render the entire communications ability useless by 
utilizing one of Van Clausewitz's rules of warfare victory in breaking 
lines of communication.  These are more than clean rooms or buildings.  
No RF penetrates, no AM or FM Radio, no cellphone, no wireless, is heard 
inside as the migratory paths for any signals are eliminated..


Herb, KV4FZ