TRIP REPORT - CONTRACT RD-161, TASK ORDER 3 (SANITIZED) - FREQUENCY -TO-TIME-TO FREQUENCY TRANSFORMATION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200060004-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 2, 2012
• Sequence Number: 4
• Publication Date: March 31, 1961
• Content Type: MEMO

Declassified in Part- Sanitized Copy Approved forRelease2012/08/02 : CIA-RDP78-03424A001200060004-0
1s4. RAJNi I/11A
FORM NO. 64
Office Memorandum ? UNITED STATES GOVERNMENT
TO
FROM ?
SUBJECT:
The Files
Trip Report -
--March 1961
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oain
2,0/t>
Contract RD-161, Task Order 3
)- Frequency-to-Time-To
Frequency Transformation
1. The F-T-F study is primarily directed toward exploring
the possibilities and uses of compressive and dispersive filter
networks in RP collection systems. Ideally, the compressive filter
would convert the regular frequency spectrum into a form which
could be treated as the time domain. While in this time domain,
operations such as lock-out and gating could be easily performed
by gating generators. After performing the desired operations on
the spectrum, the resultant signals could be passed through a dis-
persing network which would reconstitute them into the frequency
domain, with their characteristics essentially unchanged except
for those operations which were performed on them whil
time domain. On 29 March 1961 the undersigned visited
to monitor pro-
gress on this task. Participating in the discussions were:
2. has completed a working breadboard model of an
F-T-F receiver. In the breadboard system, a 27 mo input signal is
being used to simulate a signal transmission. A local oscillator
sweeping from 36 - 38 me produces a 9 - 11 me swept signal which is
fed into the first compressive network. The bandwidth of the entire
system is approximately 2 mai wide, yet sensitivity is equivalent
to a bandwidth. of about 100 kc indicating a compressive figure of
approximately 20. Shaping networks are utilized to eliminate pre-
dictable spurious responses. The output from the shaping networks
is then fed into the dispersing filter which returns the frequency
spectrum to its original state.
3. Considerable difficulty has been experienced in designing
shaping networks to eltminate the effects of distortion and phase
CONFIDENTIAL,'
Declassified in Part - Sanitized Copy Approved for Release 2012/08/02 : CIA-RDP78-03424A001200060004-0
Declassified in Part- Sanitized Copy Approved forRelease2012/08/02 : CIA-RDP78-03424A001200060004-0
SECRET
CONFIDEN1 N
SUBJECT:
Trip Report - Contract RD-16l. Task Order 3
- Frequency-to-Time-to
Frequency Transformation
error from the filters themselves. The results, though substanti-
ating the logical, correctness of an F=T-F receiver, are not very
encouraging. One of the principal problems concerns the difficulty
of acquiring electronic components with sufficiently precise values.
4. This completes the major portion of the study project and
it is anticipated that the main effort from now on will be directed
toward assembling and evaluating the data and writing a final report.
Distribution:
Subject Fil
RO, Lab
Monthly (2)
EP Chrono
FO
ENTllAli
-2-
Declassified in Part - Sanitized Copy Approved for Release 2012/08/02 : CIA-RDP78-03424A001200060004-0