|
|
|
|
|
|
Miniature covert microphones
Shure, also known as Shure Brothers Company,
is a manufacturer of audio products, based
in Niles (Illinois, USA). The company was founded in 1925 by Sidney Shure
as a supplier of radio part kits [1], and has since become a consumer and
professional audio manufacturer of microphones, wireless microphones,
discussion systems, audio mixers and digital signal processing.
Apart from complete microphones, Shure also has been supplying bare
microphone elements,
for use in a wide variety of equipment, including
covert listening devices (bugs).
One of Shure's major customers in this respect has been the
US Central Intelligence Agency (CIA),
who used its microphones,
along those of competitor Knowles,
in a range of bugging devices, such as
Easy Chair.
|
|
|
Shure microphones on this website
|
|
|
The Shure MC-11 was one of the first dynamic microphones to be
used for covert listening devices. It is housed in an aluminium
enclosure with a diameter of 26 mm. It is 11.5 mm thick and weights
13 grams.
The MC-11 was used in the late 1950s and early 1960s with the
first generations of covert listening devices (bugs),
such as the ST-2A and the
Easy Chair devices.
➤ MC-11 datasheet
|
|
|
The MC-30 can bee seen as a smaller variant of the MC-11.
It is housed in a rectangular metal enclosure that measures
13.1 x 12.7 x 6.7 mm and weights just 3.5 grams. At the time
of its introduction in 1958, it was one of the smallest
microphone elements for listening devices.
The microphone has a frequency response of 400 - 4000 Hz
and was a direct competitor of the
Knowles BA-1501.
It was used with bugs like the
Easy Chair Mark III
and Easy Chair Mark V.
➤ MC-30 datasheet
|
|
|
Sensitivity -76 dB (1V per microbar) Dimensions 0.5 x 0.5 x 0.25 inch (12.5 x 12.5 x 6.5 mm) Direction Unidirectional Impedance 1850 Ω Frequency 400 - 3500 Hz Shape Rectangular Element Magnetic
|
|
The following Shure microphones are known to have been used in covert equipment:
|
|
|
|
Any links shown in red are currently unavailable.
If you like the information on this website, why not make a donation?
© Crypto Museum. Created: Friday 31 March 2017. Last changed: Sunday, 04 December 2022 - 15:06 CET.
|
 |
|
|
|
