Telephone Transmitter (PCB)

PKI 2270Print

In many cases of observation the telephone conversations have to be monitored. With the PKI 2270 such tasks can easily be done. Due to its small size and unobtrusive appearance, this transmitter really is the champion in its class. The transmitter is supplied as a printed circuit board (PCB) only and is coated with a special protective lacquer which protects it against environmental conditions. This allows a fast and easy installation into every kind of analogue telephone set in which it looks like a standard component being completelyinconspicuous to the user. The installation inside the telephone set should be made in serial mode; both polarities are allowed. PKI 2270 is only transmitting when a telephone conversation starts and therefore is non-detectable when the telephone is not in use. Another advantage is the independence from short-lived power supplies like batteries as the unit is continuously powered from the telephone line.


  • Easy to disguise
  • Looks like installed standard components
  • Automatic off-hook detection
  • Long term unattended operation
  • Quick installation
  • UHF frequency around 427 MHz
  • Crystal controlled
  • 5 mW output power
  • Antenna via telephone cable
  • Serial mode connection
  • Both polarities allowed
  • Dimensions 30x14x7 mm