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CIA NRP EC
The system works in the 400-480 MHz UHF frequency range 1 and uses pulse
trains for sending two commands: ON and OFF. Although it could be used with
virtually any type of covert listening device,
it was primarily intended for the SRS-52,
SRS-56 and SRS-91 bugging systems.
There were two versions of the QRR-25 receiver: a small one
for operation with batteries, and a larger one with a built-in mains
power supply unit (PSU). The two variants are shown in the image on the
right. The bright yellow colour indicates that these were laboratory models.
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A sub-300 MHz variant was anticipated [B].
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This page currently acts as a placeholder for future information about
this item, and will be updated as and when new information becomes
available. If you have additional information,
please contact us.
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The device is just 50 mm long and has the usual diameter of 26 mm.
Including the cabling and connectors, it weights approx. 94 grams.
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Switch receiver with PSU
QRR-25-UWP
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An enhanced version of the QRR-25, with built-in UWP mains power supply unit
(PSU) was known as QRR-25-UWP. De device has a length of 115 mm and
weights 150 grams, including the cabling and connectors.
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- Manual for QRS-25 Equipment
NRP/CIA, September 1969.
- Manual for QRS-25 Second Evaluation Model
NRP/CIA, May 1970.
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© Crypto Museum. Created: Wednesday 19 April 2017. Last changed: Tuesday, 29 November 2022 - 08:52 CET.
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