CONTRACT RD-107, TASK ORDER #3, VHF FERRITE ANTENNAS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000500020007-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 22, 2016
• Document Release Date: July 16, 2012
• Sequence Number: 7
• Publication Date: August 28, 1956
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/07/16: CIA-RDP78-03424A000500020007-9
? ~UNFIDENTIl
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Office M7morandum ? UNITED STATES GOVERNMENT
TO : The Files
DATh 28 August 1956
SUBJECT: Contract FtD-10J_ s VHF Ferrite Ant
1. On August 23, 1956 a meeting was held at the
contract. Present at the meet were:
to discuss the subject ,
2. contractor is waiting to obtain access to the'-screen`
room at for further testing of the various configurations of
Ferrite Antennas. It is felt that no. further progress can be made,
with antenna configuration until the use of this facility is obtained.
3. Two possible configurations of the tunable antenna were
discussed. This antenna will use-the broad band antenna with a'simple
parallel resonant filter using a disc with lead screw type capacitor.
This filter has band widths at the 3D B points of from 2 megacycles at
60 megacycles to 10 megacycles at some point in the tuning range. The
band width is not regular with the tuning range and will vary with
antenna loading. At the lower end of the band, capacitor tuning is
.003 inches per megacycle. One configuration was a veeder root counter
operated from a large gear on the capacitor which would allow reading to
.0002 inches. Another configuration was the use of a micrometer running
the length of the box allowing readings to .0005 inches. In this
configuration 15 turns of the 'micrometer shaft is required to tune the
band. The micrometer configuration was tentatively chosen because it
allows the operator's hand to be at the greatest distance from the
capacitor thus avoiding possible hand capacity induced errors. This
decision is subject tothe possibility that the micrometer shaft running
parallel to the Ferrite Antenna will destort the antenna pattern or
decrease sensitivity. This can be determined only after access to the
screen room is obtained. Box dimensions of the tunable antenna will be
6 1/8 by 1 3/8 by 2 1/2 inches.
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CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/07/16: CIA-RDP78-03424A000500020007-9 J