CONTRACT NO. RD-91-SA

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000200040035-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 5
• Document Creation Date: December 22, 2016
• Document Release Date: May 24, 2011
• Sequence Number: 35
• Publication Date: September 16, 1957
• Content Type: MEMO

$T .N 1=N4t?1 `' '( MI?TDF NTIAL
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Office Mem~randum. UNITED STATES GOVERNMENT
.fW
1. Enclosed is an Invention Disclosure on a CW Signal
Detector, submitted by the Contractor in connection with its
final report under this Contract.
2. Inasmuch as the Contractor indicates that it will not
file a patent application on the invention, we should like to,
know whether you consider the device of sufficient importance
to warrant the Agency in obtaining an assignment of the inven-
tion and seeking patent protection in b own behalf.
Enclosures:
1. Letter (1 copy)
2. Certificate of Compliance (1 copy)
3. Invention Disclosure No. 16-314+ (1 copy)
Distribution:
Orig. - Addressee
1 - RD-91-SA (Official)
1 - Chrono
1 - Admin
1 - T&SB
OL/PD/T&SB:
(16 September 1957)
, Niffl NTIAI
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: Chief, Engineering Division/OC
FROM : Acting Chief, Termination and settlement Branch
SUBJECT: Contract No. RD-91-SA
 Sanitized Copy Approved for Release 2``01411/05/24: CIA-RDP78-03424A000200040035-9
~~ I { TIIAL
August 6, 1957
Subject: Re orting of Royalties and Inventions on Contract No. RD-91-SA, 25X1'
No. H-2061
Enclosure: (1) Royalty Report DD Form 783 (copies)
t,~V _ Certificate of Compliance (It copies)
3,) One (1) copy of Invention Disclosure No. 16-3111
Enclosed as required are completed copies of the Royalty Report, Certificate
tiof Compliance, and Invention Disclosure on the subject contract. If further informa-
on is desired, feel free to contact us at your convenience.
Very truly yours,
Contract Coordinator
EJR/vlp
CONFIDENTIAL
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 .^..^^~e~w."rIAI
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CEjZ"lfllPICATE OF COMPLIANCE WITH CONTRACT PA'IMM' F} O'B'IS IONS
CONTRACT NO.il ik-~?i awl
"~~E CONTRACTOR
DA,.
The undersigned contractor hereby certifies that a
complete written disclosure of any and all inventions made
under contract No. 03 MA ~ a '9 has been
delivered to the 'o or s designee as
required by the terms of the contract and that all records,
Including notebooks and reports a maintained or prepared in the
performance thereof have been examined for any inventions that
should be reported.
The appended schedule forming a part of this certificate
identifies by the inventor,,, title and date of submission,, all
invention disclosures, if any, that have been submitted or are
being submitted herewith in compliance with the terms of the
above contract. Other than those inventions reported in the
disclosures listed in the appended schedule, there are no
inventions to report.
-1/
ConfrFer-ing Officer
INVENTOR
SCHEDULE OF INVENTION DISCLOSURES
DOES CONTRACTOR ELECT TO
TITLE OF DA'Z'E OF FILE PATENT APPLICATION?
INVENMON SUBMISSION
cv SIt IIAL 8-2-57
CONFIDENTIAL
25X1
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16 "14
H-2061 Received 7/2/56
INVENTION DISCLOSURE
Title: CW Signal Detector
Purpose: To increase sensitivity to CW signals of existing crystal video
receivers.
....Closest previously known approach.... and advantages-,
Many devices have been used for this purpose such as mechanical
choppers, impedance balance circuits and A.C. crystal bias. Present method
incorporates existing equipment and creates much greater sensitivity.
Description and sketch:
This process utilizes the output of an impulse generator, originally supplied
for calibration of the system. The output of this generator is a .002 micro-
second pulse, with a frequency spectrum, from 1 KMC to 40 KMC, a repetition
rate of approximately 400 cps.
-...e output signal is fed through a R-F filter which possesses the same band-
width as the receiving antenna. The filtered signal is probe injected into
the antenna horn or fed into the cable connecting the crystal detector to the
antenna depending on the characteristics of the antenna (dipole, helix or wave-
guide) in use.
The impulse level is set below that of minimum detectable signal. Thus in the
absence of C-W signal the output of the video amplifier is that of normal
crystal video operation.
The presence of a CW signal will cause the impulse frequencies to be mixed with
the CW frequency at the crystal. This band of frequencies is accepted by the
receiver and a pulse is produced which is dependent upon the amplitude of OW
signal and the video bandwidth of the crystal video receiver in use.
his signal is amplified by the video amplifier followed by an, audio amplifier.
ae resulting output signal is a 400 cycle tone.
This system cannot have greater sensitivity than that of the crystal operated
as a video detector. However, this method is superior to any chopping device
or balance circuits now in use and will operate as a video detector for CW and
FM signals as well as for AM signals.
Witnessed & Understood by:
6/25/56
/26/56
25X1
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Built 6/8/5-6: Tested 6/8/56: Recorded in Notebook No. 009, page 64.
85~ ~
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CONFIDENTIAL
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