TECHNICAL PROPOSAL MODIFICATION OF 'F' RACK - EVENT MARKER

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81B00878R001400030126-0
• Release Decision: RIFPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 9, 2016
• Document Release Date: January 27, 2000
• Sequence Number: 126
• Publication Date: October 7, 1957
• Content Type: SUMMARY

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Approved For ReJ.ase 2000/09/01 : CIA-RDe c8RQ0.14Q0A3126--
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COPY / OF _-3
7 October 1957
TECHNICAL PROPOSAL
MODIFICATION OF "F" RACK - EVENT MARKER.
1. Introduction
This technical exhibit concerns the modification. of the Event-
Marker Equipment Time Display. The objective is to modify the
operation of the Time Display to indicate time relative to the start
of a mission rather than to an event and an 8-db dip with time reference
tone, as originally planned. The discussion which follows concerns
the proposed functional changes, and the circuit and mechanical
changes involved.
2. Functional Changes
The functional changes resulting from the proposed modification
are summarized below.
(1) The time displayed will be changed from units of
minutes, seconds and tenths of seconds to units of hours,
minutes and tens of seconds.
(2) The reset mode will be changed from either front
panel manual re set or reset by an 8 -db dip in the
incoming signal, to front panel manual reset only.
(3) The time displayed will be changed from a display
of the time of occurrence of an event on a selected
input channel, with the display held at this count until
a reset or another event occurs, to a continuous time
display, with the display changing every ten seconds.
(4) The Time -Display mode will be changed from either a
strip -chart recording of elapsed time or a Time -Display
indication for a particular input channel, to the operation
of both displays at all times.
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Approved For Release 200 O J*MDP81 B00878R001400030126-0
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Page 2of2
7 October 1957
TECHNICAL PROPOSAL
(Continued)
3. Circuit and Mechanical Changes
The circuit and mechanical changes involved in the modification
are summarized below.
(1) The front-panel escutcheon will be relabeled.
(2) An additional decade -counter unit will be installed to
count hours. The present circuitry gives an output each
hour, but no record is kept (electronically) of the number
of hours elapsed from a reset.
(3) The readout control bus will be keyed continuously to
provide constant. readout capability.
(4) The electronic reset circuit will be disabled.
(5) The switch permitting selection of a time display on
either the chart recorder or on the Time -Display unit
will be disabled and the two displays. activated simultaneously
and in synchronism.
Approved For Release 2000/09/01 : CIA~RDP81 B00878R001400030126-0
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