OS-5 BEAT FREQUENCY OSCILLATOR (SANITIZED) PROTOTYPE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200120012-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 9
• Document Creation Date: December 22, 2016
• Document Release Date: February 22, 2012
• Sequence Number: 12
• Publication Date: October 21, 1959
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
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A&A Report No. 228
Project No. 2004_154
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OS-5 BEAT FREQUENCY OSCILIATOR
--]PROTOTYPE
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21 October 1959
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
D O
The OS-5 Beat Frequency Oscillator was subjected to a Class B
evaluation. The device, originally designed by the R&D Laborato ,
is a prototype and was fabricated by 25X1
The OS-5 operates on a freauencv of 455 kc + I k
25X1
25X1
The OS-5 may be directly coupled to the antenna input 25X1
terminals of the receiver or may be inductively coupled to the mixer
section of the receiver by wrapping the BFO lead around the mixer tube.
prototype #219 and of the R&D model x/218 were compared. resu
of the tests conducted on each unit are described in paragraph 2.
Photographs of the units are shown on pages 6, 7 and 8.
The mechanical and electrical characteristics of the
2.1.
Size and Weight
Prototype OS-5:
3-1/16" x 2-5/16" x 1-13/16" -
4_1/2 ounces
R&D OS-5 :
3-1/16" x 2-5/16" x 1-13/16" -
4_1/2 ounces
2.2.
Frequency Range
Prototype OS-5:
453.280 - 457.061 kc
R&D OS-5 :
454.337 - 461.072 kc
fi
y
2.3.
Tuning Range
The kilocycle tuning range of the units below and above 455 kc is:
kc below 455 kc
kc above 455 kc
total kc
Prototype OS-5:
1.720
2.061
3.781
R&D OS-5 :
0.663
6.272
6.735
2.4. OS-5 DC Input Power
R&D OS-5 : 0.34 ma 1.5 volts - 0.51 milliwatt
The OS-5 oscillator uses a standard penlite battery such as the
RCA No. VS074 1.5 volt type.
Prototype OS-5: 0.45 ma/1.5 volts - 0.68 milliwatt
-1-
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
2rv
2.5. 08-5 Output voltage
The OS-5 output voltage measured with an HP-410B VTVM is;
Prototype 08 -5 : 0.210 volt I 3 4 0 vn 5
nar ^M c n n7i
a[st v . ~ v o ~_, .,. ,
2.6. OS-5 Frequency Drift Versus Temperature
Temperature
?C
OS-5 Output Frequency
Kilocycles
Frequency Drift (cycles)
from reading at 23?C
J+o
464.462
+10,823
-20
462.750
+ 9,111
+23
453.639
0
+30
* 457.095
+ 3,456
+40
* 457.811
+ 4,172
+50
* 453.723
+ 84
Prototype OS-5
R&D 08 -5
Temperature
?C
OS-5 Output Frequency
Kilocycles
Frequency Drift (cglee )
from reading at 23 C
-4o
462.228
+ 8,073
.20
461.504
+ 6,349
+23
454.155
0
+30
453.811
- 344
+40
. 453.336
- 819
+50
452.433
- 1,722
* The frequency readings taken at 300, 40?, and 500 are not re-
producible. The OS-5 prototype is unstable and changes output
frequency due to the tuning slug changing its position in the
oscillator coil.
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
2.7. 08-5 Cold Start Frequency Drift Rate
The OS-5 frequency drift was measured from a cold start. The
ambient temperature was 23?C. See curve, figure 1.
Pro oe OS-5
R&D 08-3
Time
Frequency
Cycles
Time
Frequency
Cycles
Minutes
Kilocycles
Drift
Minutes
Kilocycles
Drift
0
455.957
0
0
453.975
0
15 sec
455.947
-10
15 sec
453.948
-27
30 sec
455.936
-21
30 sec
453.938
-37
45 sec
455.926
-31
45 sec
453.925
-50
1
455.919
-36
1
453.918
-57
2
455.913
-44
2
453.900
-75
3
455.907
-50
3
453.890
-85
4
455.892
-65
4
453.884
-91
5
455.883
-74
5
453.881
-94
10
455.878
-79
10
453.874
-101
15
455.875
-82
15
453.876
-99
20
455.871
-86
20
453.895
-80
25
455.876
-81
25
453.914
-61
30
455.881
-76
30
453.934
-41
35
455.883
-74
35
453.946
-26
40
455.885
-72
40
453.958
-17
45
455.886
-71
45
453.966
- 9
50
455.884
-73
50
453.973
- 2
55
455.874
-83
55
453.980
+ 5
60
455.866
-91
60
453.987
+12
-3-
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
 359.11 KEUFFEL 9 ESSER CO.
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
3. CONCLUSIONS AND RECOMMENDATIONS
3.1. Conclusions
The 08-5 Prototype compares favorably with the 25X1
R&D 08-5 regarding:
(1) size
(2) weight
(3) circuitry.
Th OS-5 prototype does not compare favorably with 25X1
the R&D 0 - regar ing:
(1) battery power requirements
(2) frequency stability.
3.2. Recommendations
The prototype 03-5 should be improved by adjusting the biases
on the 2N135 transistor circuit. The prototype uses a oscillator coil
which is different from the type used in the R&D model. This may account
for the increase in battery current which the prototype requires and for
the loss of output voltage.
The slug in the oscillator coil changes its position because it
does not fit properly in the coil. A larger slug which fits the coil
form should be used or the present slug should be sealed in position
after tuning the oscillator to 455 kc.
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
OS-5 BEAT FREQUENCY OSCILLATOR
PROTOTYPE MODEL
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
0
PROTOTYPE MODEL
OS-5 BEAT FREQUENCY OSCILLATOR
COMPONENT LAYOUT (TOP 'VIEW)
R&D LAB MODEL
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A001200120012-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4
PROTOTYPE MODEL
R a D LAB MODEL
3 4 5 6
INCHES
OS-5 BEAT FREQUENCY OSCILLATORS
COMPONENT LAYOUT (BOTTOM VIEW)
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424AO01200120012-4