KrNews #06 15 ноября 1998

Железо

Ferrum! - Antipodslushka of the diodes while on the handset.

   (C) S. Hatsko, the radio No4.1993

   (C) 1998 Viper

ANTIPODSLUshKA from the diode


   This device is intended for
prevent eavesdropping by
positions with the phone handset.

   It is known that if the room where
installed a telephone,
is a conversation, then the circuit
polarized and a phone call
capsule there is an induced emf that
allows using a special
equipment to listen to the room when
instruments placed on a handset.
to protect against such
eavesdropping, it is enough to break
each wire line to include two
vstrechnoparallelnyh diode type D226 or
similar.

   Way of such protection based on the fact
that in the voltage range 0-0,65 In diode
has bolshimvnutrennim
resistance. Therefore, the conversational
currents induced in the scheme of the apparatus, not
go to the line. By the way, the protection of this
type used in some equipment
industrial manufacturing, such as
telephones Yantar.

   The proposed method does not protect against
eavesdropping on telephone conversations.


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