The WWII was the scenario of the biggest developments
in Electronics to warlike end. The engineers developed
accurate types of navigation systems, new methods for
detecting enemies' submarines like the SONAR, as well
as sophisticated electronic intelligence procedures by
using complex cryptographic code systems and electronic
countermeasures devices.
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(a) Radioreceiver model BC-348
manufactured for the American Armed Forces in several
versions. |
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(b) Portable transceiver
model BC-611-J, manufactured in U.S.A., by the Galvin
Mfg. Co. |
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(c) Air transportable sea
rescue transmitter model SCR-578 known in the American
military jargon as Gibson girl. |
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(d) Radio receiver made for
the Japanese Armed Forces.
Collection Edison de Freitas. |
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(e) Microphone model nº 7
used in communication systems of combat cars of
the US army. |
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Illustration of the manual of
instructions, AN-09-10-209 showing the main parts
of the receiving radio model BC 348. |
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Lleft, campaign telephone model
EE-8-B and, to the right, a more modern model, TA
43/PT, manufactured respectively for the Kellog
Corporation and W.Electric, U.S.A. |
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Iillustration of the manual of
instructions, AN-08-10-209 showing the power supply
system, called of Dynamotor, used for the receiving
radio model BC-348. |
To the right, radio-receiver model SLR-M, also manufactured
in version SLR-F. Destined to coastal installation
or ships stations. He was known as moral receiver,
or either a receiver destined to the entertainment
of troops in conflict areas. When installed in
ships it had its circuits provided with special
shield to block the radio-frequency
emitted for the oscillator that could be detected
by radiogoniometry equipment installed in enemy
submarines and, indicating the ship position. The
shield principle or radio-frequency armored circuit
was invented by American engineer Marvin Hobbs under
patent nº 2.314.309, when working for Scott
Laboratories Radio, manufacturer of this receiver.
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