[GreenKeys] On Tempest

[Larry DeSoto]

I don't remember the nomenclature but I do remember when our red TTY 
machines were converted from 20mA loop to polar keying.  The square 
mark/space pulses were converted into a +/- 12v sinusoidal mark/space 
signal.  The communications spaces were enclosed in their own copper mesh 
shielding and grounded to a red ground that was physically located in the 
red space.  Tempest inspections were regular events and also done whenever 
any physical change was made to the communications space.

I've also been told by people who know that a good tempest team could sit 
outside a house or apartment and copy pretty much anything that painted on 
any CRT screen in the neighborhood.

Larry



----- Original Message ----- 
From: <NNN7DXB at aol.com>
To: <GreenKeys at mailman.qth.net>
Sent: Wednesday, June 22, 2011 7:41 PM
Subject: Re: [GreenKeys] On Tempest


>
> This is probably one of the primary reasons why so few of
> the Kleinschmidt AN/FGC-25X were saved.
>
> In the 70s, most of them were converted to AN/FGC-161s
> after being heavily Tempested, making most largely useless
> as surplus resale equipment.
>
> Dave
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html