TRIP REPORT - FREQUENCY TO TIME TRANSFORMATION STUDY

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200060006-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 22, 2016
• Document Release Date: August 2, 2012
• Sequence Number: 6
• Publication Date: December 22, 1960
• Content Type: MEMO

Declassified in Part- Sanitized Copy Approved forRelease2012/08/02 : CIA-RDP78-03424A001200060006-8
GONFIDENAITEr
Office Memorandum ? UNITED STATES GOVERNMENT
StANDARD FORM NO. 64
TO : The Files - Contract RD-161, Task Order 3 DATE: 22 December 1960
PROM :
mn3PcT: Trip Report - Frequency to T
/2-
4.3.5
e-
? 026015 cve.olz,
formation-Study- -------
On 2 December 1960 the undersigned and
the subject task order. Discussions were held with:
SPS/EA, visited
, to monitor progress on
2. The contractor is exploring uses of compressive networks (giving
variable time delay with changing frequency) as analysis tools, and as a
technique for improving performance of scanning type receivers. Eventually,
it is expected that a receiver can be developed in which the frequency infor-
mation is converted into the time domain, in which operations may be performed
on the received signals with time gating generators. After the signals have
been "operated" on, they could be reconverted back into the frequency domain.
The total effect is that of a self-adjusting spectrum filter.
3. The contractor has fabricated a 60 stage compressive network with a
pass band from 8i to megacycles. Attenuation of this filter is approxinately
30 db at 8-1- megacycles and slightly more nem tbg upper end of the pass bd..
The maximum theoretical pulse compression ) is 48. Use of this filter
in front of the IF section of a conventional svanning receiver could therefore
theoretically increase the frequency resolution bWhis factor, or, without de-
grading the frequency resolution from that of aituperi7-7aterodyne receiver, permit
much faster scan rates. To date, maximum obtainable compressive figure has been
30. With this compressive factor it has been found possible to resolve signals
88 kc apart while using IF bandwidth of 2 megacycles. Additional tests are being
made to determine the linearity of this compressive network over the entire pass
band and to determine the adverse effects which may result from non-linearities
in this system.
4. of a compressive network as an analysis tool has also been
explored by A 500 section network has been calculated which would theo-
retically permit 100 cps resolution of a 10 millisecond noise burst with 20 kc
bandwidth. Such a todl might be especially useful on some of the SPS/AF projects.
CO FIDENT1AL
"NJ Ji
Declassified.in_Part: Sanitized Copy Approved for Release 2012/08/02 LCIA-RDP78-03424A001200060006-8