Inspection Report No. 1 - AR-18 Study Program(Classified)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-02820A001100050039-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 9, 2016
• Document Release Date: May 8, 1998
• Sequence Number: 39
• Publication Date: September 3, 1965
• Content Type: REPORT

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Approved For Release 2001 /08/0243CO 78-0282OA001100050039-2
a PTlON11L FORM NO. 10 !NO-101
UNITED STATES GOVERNMENT
Memorandum
25X1 A TO The Files:
25X1A9aFR0M :
SUBJECT:
25X1A
EP 65-271
DATE: 3 September 1965
- AR-18 Study Program with
1. Project Description:
This four month program is to measure the error rate performance
of the AR-18 1480 wpm triphase receiving equipment as a function of
signal-to-noise ratio and pulse jitter and to otherwise investigate
the performance of the AR-18 as required.
2. Contractual Information:
25X1 Al a a. Initial Cost:
b. Request for Procurement Action: 14 June 1965
c. Initiation Date: 18 June 1965
d. Completion Date: 18 October 1965
e. Deliverable Items: (1) Informal reports at conclusion of Phases
I and II
(2) Final Report
3. Date of Meeting: 25, 26 August 1965
25X1A
4. Place of Meeting:
5. Persons Attending:
Agency Non-Agency
25X1A9a
6. Contractor's Performance:
a. On schedule and expected to remain so: Yes
b. Within obligated funds and expected to remain so: Yes
c. Satisfactory technical progress: Yes
7. Project Status. .
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25X1A
25X1A5a1
 KPOCT
Approved For Release 2001/08/02 :8-02820A001100050039-2
EP 65-271
25X1A
SUBJECT: Inspection Report No. 1 - AR-18 Study Program with 25X1A
7. Project Status:
Test program number one has been satisfactorily completed. Curves
of AR-18 character error rate versus signal-to-noise ratio, pulse jitter,
and temperature have demonstrated conclusively that the AR-18 performs
poorly. Reasons for this poor performance are being examined. They
include the following:
a. The AR-18 uses germanium transistors throughout, which /
are temperature sensitive and to a large extent 2L! Lo olete, /
b. The crystal oscillator ovens all use snap-action
thermostats. Contact closures introduce errors due to impul-
sive interference.
c. The circuit design is often marginal, requiring
constant adjustment.
25X1A5a1
25X1A9a
25X1A5a1
/t
d. RF mixers are all single ended and introduce considerable
phase distortion in the received signal.
A decision is required soon as to whether to rebuild the AR-18's
or construct a new base receiver for the RS-18 system. To aid in this
decision, - has proposed to change the scope of the current
work, at no increase in funds, to examine in more detail the cause of
the poor performance and to study the performance of the recognition
ed in the AR-18. With the verbal concurrence of
n 26 August 1965, as authorized
OWN to redirect the of or c ange order is being prepared to amend the25X1A5a1
contract.
is also preparing budget estimates for rebuilding versus
.
new design. The estimates are expected within 8 weeks.
25X1A9a
Distribution:
,,R&D Subject File OC-OS OC-E/ESB TAP Chrono
Engineering Section, CB/PD/OL R&D Lab EP Chrono Monthly (2)
25X1A9a OC-E/TAP,
chw (3 September 1965)
Approved For Release 2001/08/02 : CIA
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