SIGC DEMONSTRATION OF THE AN/PAC-2

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800030004-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 27, 2016
• Document Release Date: May 14, 2014
• Sequence Number: 4
• Publication Date: July 29, 1957
• Content Type: MEMO

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Declassified in Part - Sanitized Copy Approved for Release 2014/05/14: CIA-RDP78-03330A000800030004-2
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Office Memorandum ? UNITED STATES GOVERNMENT
TO
HUMW :
: The Files
SUBJECT: SigC Demonstration of the AN/PAC-2
DATE JUL 29 1957
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1. General - The Research and Development Division, Office
of the Chief Signal Officer, gave a demonstration of the AN/PAC-2
Military Infrared Telephone in Room 3-E-234, the Pentagon, on the
afternoon of 23 July 1957. A breadboard model of an Infrared/
Microwave Communications System was also demonstrated. The meet-
ing was UNCLASSIFIED, and various interested Offices of the DOD
were represented (about 50 people). Among those present were:
SigC.
Col. Meyer - Chief, R&D Division
Mr. N. Stulman - Chief, Applied Physics
Mr. H. Dauber (Ft. Monmouth)
Mr. W. Drevneek(Ft. Monmouth)
Agency
080T/SB
TSS/APD
TSS/APD
OC-E/R&D
2. AN/PAC-2 - A two-way voice communication channel between
two infrared telephone was demonstrated. One set was mounted on
a 12-inch tripod and placed in a window facing the highway. The
second set was located just off the highway approximately 600
yards distant. The signal strength and the quality of reception
were considered satisfactory, despite a light rain over the
transmission path. The prototype was designed for a 500-yard
range, but a 1000-yard range is now claimed. The infrared
source is a PR-9 lamp (flashlight bulb) with a life of five
hours. The lamps are pre-focused at the factory, and ten lamps
are provided as spares. The beamwidth was said to be approximately
3 in both the horizontal and vertical dimensions, and operation
with the equipment hand-held was possible. The weight of the
AN/PAC-2 is 10.5 pounds.
3. Delivery - We are to receive 10 units from the SigC.
Production has been tentatively scheduled for September; however,
Mr. Stulman indicated that production planning may be revised to
consider modifying the units to incorporate the 15-5 galvanometer
modulator. At the present time our two sets are being examined
by Ft. Belvoir engineers, and a copy of their evaluation report
will be sent to us. With respect to our release of information
on the IS-5 last Friday, the Ft. Monmouth technical people felt
slighted because they has not been "cut in" on the early develop-
ment. The undersigned stated that such feelings were unqualified
since complete data on the new Infrared Modulator was released to
Ft. Monmouth over a year ago.
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Declassified in Part - Sanitized Copy Approved for Release 2014/05/14: CIA-RDP78-03330A000800030004-2
Declassified in Part- Sanitized Copy Approved forRelease2014/05/14 : CIA-RDP78-03330A000800030004-2
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4. IR/Microwave - A breadboard model of the infrared/micro-
wave voice communication channel was demonstrated over the same
range as the AN/PAC-2. The "agent" set located in the Pentagon
provided infrared transmission and microwave reception, and the
*base station" provided infrared reception and microwave trans-
mission. The "agent" set consisted of identical circuitry of
the AN/PAC-2 IR source and transistorized microphone amplifier/
modulator, and a 10 kmc cavity, diode detector, and audio
amplifier. The complete unit weighs less than 2 pounds and could
easily be transported in a coat pocket. The *base station" con-
sisted of an 18-inch diameter dish mounted above a 12-inch search-
light housing which was used as the infrared optical system. The
fidelity of the microwave reception from the base station was
greater than that from the AN/PAC-2, as was to be expected.
Microwave beamwidth measurements were not available.
5. - The SigC has plans for the development
of additional infrared/microwave "agent type" communications
equipment. Such equipment includes a "Master Station" similar
to the IS-1 and the repackaged version (which was on
exhibit), but dual optics for duplex operation are to be
incorporated. The SigC also would like to re-package their
infrared/microwave system into a smaller package having an-8-ihch
parabolic antenna with a grid coating for infrared radiation,
(50 per cent efficiency). The SigC indicated that they were not
happy about RCA's work on the AN/PAC-2, and were deeply impressed
with the IS-5 packaging and consequently asked for an introduction
to The undersigned referred such queries to
since it was their division that established
the 16-5 sterility.
6. It is believed that the modulating principle incorporated
in the I6-1, IS-4, and I6-5 remain important insofar as infrared
technological development is concerned.TSS/A1110 seeks to consult
with Northwestern University on this subject. Should certain
security aspects be adjusted, full technical liaison will be
established between the Agency, SigC, Northwestern, and
IC CONFIUENIIAL
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Declassified in Part - Sanitized Copy Approved for Release 2014/05/14: CIA-RDP78-03330A000800030004-2