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Pied Piper   SRT-40
Remote controlled covert listening device - this page is a stub

Pied Piper, abbreviated PP, was a research project carried out in 1966 and 1967 by the Dutch Radar Laboratory (NRP) in Noordwijk (Netherlands) on behalf of the US Central Intelligence Agency (CIA), as part of a long-term research contract under the name Easy Chair. It comprises a covert listening device (bug) that can remotely be turned on and off when its intelligence is not required.

The Pied Piper (PP) research project led to the development of the STR-40 transmitter (bug) and the compatible SRR-40 surveillance receiver, both of which were supplied to the CIA for eva­lu­ation, complete with baseline documentation.

It is currently unknown whether the CIA or any of its contactors in the US built equipment based on this development. The idea for the switch receiver was used in 1967 for the design of the remote-controlled SRT-57 transmitter, and in 1970 for the design of the QRS-25 system. 		  

As far as we know there are no surviving pictures of the Pied Piper project or any of the devices developed as part of it. If you have additional information about this project, please contact us, so that we can enhance this page.


Related items
SRT-40 covert transmitter (bug)
SRR-40 surveillance receiver
Remote-controlled covert listening device (bug) with DSBSC audio masking
Switch receiver system
QRS-25
Parts
Transmitter   SRT-40
SRT-40 was covert listening device (bug) that was developed as part of the Pied Piper research project. At the end of the project, the design of the SRT-40 was supplied to the CIA. It is likely that the device was then manufactured in quantity by another (US-based) subcontractor.

No image available at present. Technical details will be added as and when they become available. 		  

Receiver   SRR-40
SRR-40 was surveillance receiver that was developed as part of the Pied Piper research project. It was compatible with the SRT-40 transmitter. At the end of the project, the design of the SRR-40 was supplied to the CIA. It is likely that the device was then manufactured in quantity by another (US-based) subcontractor.

No image available at present. Technical details will be added as and when they become available. 		  



Documentation
  1. Provisional Operating Instructions for P.P. - Mk I Equipment
    NRP/CIA, April 1966.

  2. Manual for PP-Mk I Equipment
    NRP/CIA, August 1966.

  3. Study for PP Actuator and Tester
    Development study for short-range PP Mark I system.
    NRP/CIA, April 1967.
Further information
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© Crypto Museum. Created: Sunday 27 November 2022. Last changed: Sunday, 26 May 2024 - 07:33 CET.
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