OSCILLATORS - IN-3X AND IN-1X

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A000600080011-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 6
• Document Creation Date: December 22, 2016
• Document Release Date: April 11, 2012
• Sequence Number: 11
• Publication Date: April 24, 1957
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
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Chief. 8 lemsntal Programs Division, 0C
Chief, Eagineerizrg Division f
Oscillators - IN-3X and IN,, IX
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?RIG CLASS
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l.. Forded herewith are prototypes of the IN-3X, fixed
frequency reference oscillator, and. the IN-U, variable frequency
audio oscillator. The 15-3X %%presents the final prototype for
evaluation prior to fabrication of the complete order. The IN-1X
is an electrical prototype only since certain agreed upx changes
in packaging will be made Vban the unit is returzaed.
2. Although the circuit study of the INr3X has been completed,
further production of this oscillator will Upend on the quality of
the unijunction transistors now on order. The stand-off ratios and
bass resistance characteristics of these transistors have been speci-
fied, in accordance with our sturdy, to insure an accuracy of ? 2%
over the specified temperature range. Reliability checks will be
run on these transistors when received.
3. In regard to the IN-1X# a now layout will be mad* in accord-
ance with our agreeaent. It is for this reason that the present unit
is considered an electrical prototype only. The relocation of some
controls sad battery storage will facilitate a simplified hook-up and
neater yppearance. A certain minims space must be allowed for the
frequency determining capacitors as these will vary according to the
partl=lw unijunetion transistor used.
4. Schematics, parts lists, and a calibration curve are in-
cluded. A few control markings have been made in order to avoid
ambiguity. Please specify all additional marking required.
Attachments:
Schematics (2)
Parts 'Lists (2)
/AJS/rkb (24+ April 1957)
Distribution:
Original and 1
- Addressee
1
- R&D Lab
1
- OC-E Reading
1
- OC-E Chrono
1 - R&D Chron
l.ibration Curve (1)
o7063 1
C,
1 - De
24 April 1957
Declassified in Part - Sanitized Copy Approved for Release 2012/04/11 : CIA-RDP78-03535A000600080011-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
FIXED FREQUENCY REFERENCE OSCILLATOR
IN-3
Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
rage 1
I. GENERAL DESCRIPTION
The IN-3P provides a Ili ply stable 1000 cycleA one for
rPference ournoses. It is completely transistorized arA.
A high precision tuning fork is used as the frequency de-
termining element. The IN-3 is battery operated by either
~Wi
a dry or mercury cell. An additional plug has been provided
Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
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1. Power Source: Z cell (Burgess) I(Mercury cell( BM-5012R
2. Battery Polarity: c re ; See paragraph 4.2
3. Output Impedance: 2000 ohms approximately
4. Stability: 1 part in 10,000 over temperature range
5. Output Millivolts: 2K - 35 my (earphone)
5K to 100K - 100 my (recorder)
6. Temperature range: -40? to ~ 40? C
7. Warm-up Time: 45 seconds
8. Local Control: Power - SW1 (on-off)
Output Control - SW2 (push button)
9. Remote Control: Remote position not furnished
Power switch (on-off)
Output switch (push)
Remote battery
oer
Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
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Dimensions: Length Width Height
3-1516" 2-1/4" 1-1/32" Case
4-5/16" 2-1/4" 1-1/32" Over-all
Weight: 14 ounces including battery.
4.1.
Operation in local position:
(a) Turn the tog~gl,gg, switch to "ON" position (allow 45 seconds
Oe~GL
for fork4 to build up).
(b) Press the push button. ( r 't
(c) The output is taken from the IPC I) A o k
Complete remote control may be obtained
by proper connection to the four pin Winchester plug and
associated tie point. Please refer to the schematic diagram.
(a) To switch internal battery haves SW1 open and connect
external switch to B a n d C of Winchester 6 - 1 ) .
(b) To switch output connect push button switch to TP1
and point D of Winchester plug.
(c) To use remote battery remove internal battery and
connect a 1.5 volt cell to points A and B of Winchester
nli1a-
Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4
4.2. In order to prevent damage to the unit by connecting a battery
in the reverse polarity, a polarity correcting circuit has
been incorporated. When operating in the remote position,
remove the internal battery as in paragraph 4.1. (a).
v. MgIw' C-#,J ANCE
AJU edo
The IN-3 reference amplifier and controls are #$~~aY
-at re ?1 . Maintenance is limited to replficement0ef-the
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Declassified in Part - Sanitized Copy Approved for Release 2012/04/11: CIA-RDP78-03535A000600080011-4