CONTRACT(Sanitized) ECP-136-1

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001600030002-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 10
• Document Creation Date: December 28, 2016
• Document Release Date: May 25, 2001
• Sequence Number: 2
• Publication Date: March 9, 1966
• Content Type: LETTER

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Approved For F ase 2001/08/13: V
DECLASS REVIEW by NIMA/DOD
post office Box 6788
Fort Davis Station
Washington. D. C. 20020
25X1 A Attention:
25X1A Subject:
Gentlemen:
9 Mar ,h 1966
Ref: U IC 406-1840
25X1A In response to a request by your Technical Representative
we are submitting herewith an Engineering Change Proposal ( ;; '? l',6.l) to in-
corporate certain electrical and mechanical features into the 7vmra. Data Block
Reader being developed and fabricated for you under the subject coatract.
Enclosed herewith are three (3) copies of a technical document which
describes in detail those wander corrections (electrical) and operator efficiency
25X1A (mechanical) features which would be incorporated into this DataBlock Reader.
25X1A Also included herewith are three (3) copies of a - Cost B3'oakdown Work-
sheet in the total amount of
Since delivery of the end item Data Block Reader is on schedule and will
be accomplished by 30 April 1966, It is necessary that the contract be amended to
authorize theso technical changes at the earliest possible date.
We trust that this Engineering Change Proposal and the Cost data associated
with these changes as submitted herewith are complete for your eN'aluation. How-
ever, if any additional information is required. please feel free to: contact me.
Very truly yours,
qq EXCtt CEI E- ?;,1 M TII ATIC
DOES Hal APPLY
25X1A
d,uiG.IINA1 S9Cs ED BY
avw
Encs" 25X1A
Contracting officer
oevd rtease 20011(0
' rashington, D. C. 20024
0. Box 8031
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 STATINTL
Engineering Change Proposal ,
70MM DATA BLOCK READER
Prepared By:
Approved By:
Section Manager
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TABLE OF CONTENTS
Section Title
1 INTRODUCTION
2 ADDITIONAL TASKS
WANDER CORRECTION
2.2 OPERATOR EFFICIENCY
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1 INTRODUCTION
This Engineering Change Proposal has been prepared to describe
the changes in scope requested to be included in the 70MM Data Block Reader
currently designed and developed by
STATINTL
New information concerning both the film format and the
:cader's operational requirements arrived at_ subsequent to the sub-
mittal of proposal No. SME-CL-24, dated November 15, 1965. Evaluation
of this information rendered the original approach less efficient than was
originally calculated, and suggested a more suitable reading method.
Since it was impossible to change approaches later in the
contract period and still maintain the required quick reaction, the new
ca ,lion was immediately implemented into the design and fabrication of the
70MM Data Block Reader. However, was contracted to perform in
accordance with proposal No. SME-CL-24, which comprises part of the
contract, and the improvements that were incorporated in the design
constitute a change in scope and require the additional funds requested in
this Engineering Change Proposal.
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2 ADDITIONAL TASKS
The following paragraphs describe the additional tasks to be
incorporated in the 70MM Data Block Reader under this Engineering Change
Proposal.
2. 1 WANDER CORRECTION
Drawings showing the laydown mechanism of the data block
indicate that the format and the data block are recorded in two different
stations, resulting in format wander of .04611 independent of block wander
of the same amount. In addition, a static error of . 030" in block location
may occur due to mask positioning tolerances. As a result, the data block
may fall partially into the format, or partially out of the film edge.
In most cases, however, only one of the variables - block and
format - is recorded in its worst wander condition, or they may both wander
in the same direction. For example:
The block is recorded in its nominal position, or above it,
but the format has wandered to its uppermost position. The
dots do not fall in the format.
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The block is recorded in its lowest position, but so is the
format. Again, the dots are not in the format.
The original approach. called for fixed,wide diodes, as the
vow reading elements. If these diodes are made wide enough to cover the,block's
worst case wander, the lower diode will protrude into the format in example
(a), mistake it for a dot and perform an erroneous reading. If the diodes
are made narrower, so that they skirt the edge of the format's uppermost
position, the block in condition (b) will be missed, since the index dots
will be below the edge of the lower diodes.
Other examples involve an. ambiguous strip between, the two
rows of dots, where the upper row may be sensed by a lower diode (and
vice-versa) if the gap between the diodes is narrow, or a dot may fall. into
a gap between two diodes and be missed altogether if that gap is wide.
Under the proposed change, the read heads will consist of
14 diodes .01811 each. The leading head will sense the position of the dots
in the upper row, and based upon this information, the logic voila activate
only the diodes that are located around the actual position of the rows in
the data block. A group of adjacent activated diodes will effectively
perform as a single wide diode, similar to that in the original proposal,
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except that by pre-sensing and switching the outputs of the diodes into
variable clusters, the heads will effectively float up and down together with
the data rows.
The basic difference between the two reading methods is that
rather than opening a wide aperture to accommodate for maxirr.ium data
block wander as originally proposed, the new approach will let the nominal
size aperture wander together with the block. This. solution requires 24
additional read amplifiers and the associated sensing and switching logic.
It is also the major cause for increased reading reliability and lower error
rate.
2. G OPERATOR EFFICIENCY
To increase the operator's efficiency, it was requested that
the following modifications be made in the transport design.
a) The operator will control the reader from a sitting;
position. This requires mounting the film transport on a
vertical plate rather than a table top base, as well as an
optical assembly consisting of two, lenses. and a beam splitter
to project the block image to the operator's eye level.-
-4-
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b) Addition of manual cranks on the film reels to enable
manual transportation of the film,
c) Addition of facility to stop the film before the next frame.
This required addition of heavy duty brakes on the film
reels.
d) Automatic stopping on detected errors.
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 STATINTL
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