[Milsurplus] Re: Milsurplus Digest, LO radiation - Tempest

[Sheldon Daitch]

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> > The newest TEMPEST threats are LED power on indicators and cell phones.  The old RF receiver method of remote viewing of a TV or computer monitor has been replaced with the use of a telescope and a wide bandwidth photo diode.  Just aim the scope at some spot on the ceiling or wall and the output is the video signal, use three scopes if you want a color display.
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If TEMPEST threats are a real concern, you don't have any cell phones in a SCIF type environment anyway, and further, most SCIF type environments are fully isolated, and don't have any windows, either.