RADIATION TESTS ON THE (SANITIZED) COMMUNICATION SYSTEM

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800060013-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 23, 2016
• Document Release Date: April 23, 2014
• Sequence Number: 13
• Publication Date: September 24, 1954
• Content Type: MEMO

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Declassified in Part - Sanitized Copy Approved for Release 2014/04/29: CIA-RDP78-03330A000800060013-9
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Office Memorandum ? UNITED STATES GOVERNMENT
TO :
Chief, Research & Development Branch, OC DATE: 24 September 1954
FROM :
Chief, Auxiliary Functions
Branch
SUBJECT:
Radiation Tests on the
Communication System
50X1
1. INTRODUCTION
A request was received by the Instrumentation Section of AFB
to run a series of radiation tests of he subject system for the
purpose of determining if the security of this system could be -
jeopardized by picking up radiation from this equipment and, if so, _
the maximum distance it would be possible to receive this radiation.
The units tested consisted of the following:
2. SCOPE OF THE TEST
The tests were run over the VLF range of 6 KC. to 250 KC. for the
purpose of determining the radiation emission of these particular units
over this range of frequencies. Since these units were set up in the
1700 Wing of Alcott Hall, an extremely high ambient noise level was
encountered due to fluorescent lighting, teletype equipment and office
equipment, thus making any radiation check of this nature rather incon-
clusive.
3. METHOD
A special very low frequency radio receiver and a Stoddard Intensity
Meter, Model NM-10A were used as a radiation pick-up device. Checks were
made using the single loop and an inductive pick-up loop consisting of
210 turns of wire wound on a 3 foot by 1 foot frame. The first test was
conducted with the special VLF receiver and inductive pick-up loop over
the frequency range of 6 KC to 90 KC. The second test was run using the
Stoddard NM-10A radio receiver covering a range of 14 KC.to 250 KC.,
using both the pick-up loop, and the single loop antenna supplied with
the receiver.
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CON. FIDENPAL
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/29: CIA-RDP78-03330A000800060013-9
Declassified in Part - Sanitized Copy Approved for Release 2014/04/29 : CIA-RDP78-03330A000800060013-9
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4. RESULTS
I
The maximum distance that radiation could be detected with either
type of antenna, and either receiver, was six (6) inches. This radiation
did not seem to come from any particular location of the equipment being
tested, but as pointed out above, the high ambient noise level at the
particular location in which these tests were run made it very difficult
to determine just what the absolute radiation amounted to.
5. CONCLUSIONS
'Of
While the above results are rather inclusive, it would seem that in
view of the very short distance involved in picking up any radiation at
all would make this equipment relatively secure. This is borne out by
the tests run at the Research and Development Laboratory, under more
favorable conditions and from 150 KC to 25 MC.
SE*T
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STAT
Declassified in Part - Sanitized Copy Approved for Release 2014/04/29: CIA-RDP78-03330A000800060013-9