(SANITIZED)AUDIO OSCILLATOR

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A000500040032-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 27, 2016
• Document Release Date: September 13, 2012
• Sequence Number: 32
• Publication Date: June 27, 1955
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A000500040032-6
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? ROUTING AND RECORD SHEET
INSTRUCTIONS: Officer designations should be used in the "TO" column'. Under each comment a line should be drawn across sheet
and each comment numbered to correspond with the number in the "TO" column. Each officer should initial (check mar_k insufficient)
before further routing. This Routing and Record Sheet should be returned to Registry.
FROM:
COMMUNICATIONS SUPPLEMENTAL
PROGRAM DIVISION
NO. \
SPM-5-144 ,
DATE
27 June 1955 \
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'U. S. GOVERNMENT PRINTING OFFICE
FORM NO. 51-10 SECRET
FEB 1950
Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A000500040032-6
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Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A000500040032-6
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Office Memorandum ? UNITED STATES GOVERNMENT
SPM-5-144
TO : Chief, Communications Engineering Division DATE:
FROM :
SUBJECT:
Chief, Communications Supplemental Programs
DiV-StigNENT NO.
NO CHANGE IN CLASS. 0
0 DECLASSIFIED 25X1
udio Oscillator CLASS. CHANGED TO: TS S
NEXT REVIEW DATE'
AVM: t1R074%2
DATE 4, 19130 REVIEWER: 0...,..t.sxo
. This Division has an outstanding requirement for a personal-carried
audio oscillator to be used in conjunction with ELINT presence receivers. 25X1
The intent of the oscillator is to enable to approximate the PRF of 25X1
an intercepted radar by matching the frequency of the audio oscillator to that
of the radar. This Division has conducted preliminary investigations to deter-
mine the desirable characteristics of such an oscillator and has arrived at the
following as operational requirements:
A. The size should not be in excess of 3 x 2x 1 inches;
B. Frequency range: 30 - 3000 CPS;
C. Frequency stability: 5% between the limits of 0-C.4..
D. Calibration accuracy: 10% at the low end and 5% at the high end;
E. Output wave form: Pulse;
F. Connections: (1) presence receiver input ?
(2) Miniature headphone output;
G. Manual Controls: (1) pushbutton on/off switch
(2) frequency control
(3) output level (if practical);
2. It is requested that your Division undertake the design and construc-
tion of two oscillators conforming to the operational characteristics as des-
cribed above. Should your laboratory models prove successful in local field
evaluations, it is anticipated that a contract for twenty-five additional oscil-
lators will be instigated with your models serving as prototypes. Should your
Division desire additional information concerning the intended use or operational
characteristics required, reference is made to the ELINT Activities Branch of
this Division (2718 Alcott Hall,
Distribution:
Orig & 1 - OC-E
s '2%
25X1
if 42/xv ,/ 25X1
Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A000500040032-6