'D' RACK - RECOMMENDATION FOR CANCELLATION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81B00878R001400030093-7
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 9, 2016
• Document Release Date: January 27, 2000
• Sequence Number: 93
• Publication Date: April 4, 1957
• Content Type: MF

Approved 2000/0r.irMA-RDP81a00878R001400030093-7
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1957
=MOM Ma Project Director A.Pril
TIMM t Contracting Officer
0OBJECT tlet leek - Beaammeaaation for Cancellation
1. The HIr leek was to be *fast resd-out of PM In MOT signal
enslysts, this is the first item of modUlatioa data needed for establish-
nest of the class or signal. With MT end rough frequency data, * signal
eaa vevelly be elassified as anew or a previously identified type as well
U the exact type if it is e yrevionely identified type. There is ameed
for ',fester readi.out syttom for TOY en& this seed. bas bees greatly in-
as a result of the coatinuously operate totem. X, IT mad V.
2. The *VP leek, was to have measured the Unarm% batman two sta-
tely (pulses) sted oempared this interval with the next sine intervals
with an 'verso value tot* read-out if the interval veristion did not
exceed some pre-set value. xr the interval variation WWI beyond this
W&Niet vale, the instrumeat would register no result. It was believed
25X1A b sod myself that 10 microaeoond accuracy could be oh-
* steels interval end 1 microsecond accuracy might
be residua by avenging tea intervals.
). This project hes had low priority at 1=W since the equimeent
wee not essential to the read-out process. About five weeks ago, Dr.
25X1Adropped a suggestion that whops the project should be
sett!!!!!illieloser look than habeas made for sometime was made an
ep, visit to 24 early in Parch. The project was being carried out in
the Imstrument Divisioa (the same group that produced the omeOletall
umaselble Reck). The englatters were struggling with the job of
tompeesating for the variation in recorder speeds. They had also built
UP Tether sophistisated counting circuitry for covering the first ten
Pelee intervals.
4. The prime question involved in the feasibility of the nr Reek,
in my opinion, is the threshold that will be necessary (between *lapel
aid noise) to operate the reek. On etheoretioal basis end allowing for
no ttempt to he use of the known differences between pulse =orgy die.
trihution sad noise energy distribution, one can show that animism or
dh. threshold would be needed. Recent Navy work on a almilar prOblea
iedittetee that e dh. would be sufficient if a priori kaowledat of puleee
was creaked into the equipment. 'Then, too the "D" Reek coneept lacluded
the setting up of gates within which the pollees were to fall to further
aiSterantiata between pulse endwise. This should further reduce the
threshold needed. Only experimental work could stetablieh this thresh-
old required.
25X1A IMSLIM 6 PS
tt /J1- 15 #64.1 al. 44
Approveg Fs2,6-1Ritsrk3000/6a7 1:113138180478AFIMIIA9342V1A
Approved For Release 2000/09/brgIA-RDP81a00878R001400030093-7
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2-
Bseend*ti0fl for CssceUsticn.
never been answered to myestisfastian.
t wee noted that the gets idea bad not been
*spot a levering of a threshold free
that no attempt had been solo to make use
end noise. These points mere stressed
oftineers investigate this petit mad oca-
their work foratest tube viewed the reek of
Upon inquiry during the weak of 25 Swab, the men? inked it they
could wait until the lest of the week for the demonstration. The equiP-
meat vas demonstrated on Thursday. No provision existed for opepensating
for the recorder speed. The signals is Ise were *leen laboratory pulses
produeed with good verve form and with infinity signal to noise ratio (m,
noise). Negates nor noise lifferentietioa onset vas is use Tha ovum
mated 1 nicely but this demonstrates nothing since e commercial mounter
norting $10000, mass the levlitt Paakard and Berkeley would have done
ea well. Woe questioning, they said they had me solution for the re -
oorder speed problem. They bad tried the rook on live topes but the sig
nal to Soles ratio was always tee low to operate their equipment, they
reported. Although they had mot measured the neseeeary threshold, they
intimated. that 30 db. would be noodled. A theoretical study showed 22 db.
would be mammary 'with a 2$ error (20a sec. on a 1000 cycle PRY). They
doted if better could be done than 25 db. vs. not 25X1A
T. 1 discussed this usesoourailai 4accastrattork with 25X1A
Is mad that although they would continue the project if IMES! he
thought there was no future in it mad felt that it should be discontinued.
Be proposed some methods of trying to acoomplish the requirement. These
Judge to have a less likelihood of success then the original approach.
They also required considerable time to reed-out the result. I. added
that be felt that perhaps 20 db. of threshold would bo required and a
lover accuracy then stated above would result.
8. Since a 20 db. threshold would be of very little, if spy, value
and his suggestions were mot believed to result is ww, less threshold than
the original plan, it is remseaeaded that the project be dropped. It ie
believed that the accuracies stated originally can mot be met, but that
considerable reduction in threshold might be obtained. With 1111111F 25X1A
boring mo faith LA the project (neither the obtaining of a useable thresh-
ad nor the correction of tope speed variation), it seem doubtful if
Nothing of value can ono from extending the project.
cc
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Approved ForZelease 2000/c)Rip* IA-RDP81.1300878R001400030093-7
MI= "D"
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ReocomenAntion for Cancellation
25X1A
25X1A
Distri
Copies 2 ?toject Director
25X1A
25X1A 5 SO
7 IMO
8 trejeet Citron
3
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APR 1957
APR 5 1957
X think this is just moth= 7ynrt1371 at the lack of adequate super-
vie ton which has been characteristic of much of B-1-1's work. Tho Instru-
mentation Division was apparently given this whole job of ground read-out
equipsumt without having been advised by Burt of the characteristics
desired and vere not kept informed of the discussions that took place
from tims to time with respect to details.
25X1A
ZUNI' start orri.cer
5X1A
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