|
|
|
|
|
|
|
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.
|
|
|
-
A sub-300 MHz variant was anticipated [B].
|
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.
|
The device is just 50 mm long and has the usual diameter of 26 mm.
Including the cabling and connectors, it weighs approx. 94 grams.
|
|
|
|
|
Switch receiver with PSU
QRR-25-UWP
|
|
|
|
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
weighs 150 grams, including the cabling and connectors.
|
|
|
- Manual for QRS-25 Equipment
NRP/CIA, September 1969.
- Manual for QRS-25 Second Evaluation Model
NRP/CIA, May 1970.
|
|
|
|
Any links shown in red are currently unavailable.
If you like the information on this website, why not make a donation?
© Crypto Museum. Created: Wednesday 19 April 2017. Last changed: Wednesday, 05 November 2025 - 11:39 CET.
|
 |
|
|
|
