TEST REPORT RR-2B RECEIVER N.E.M.S. PROTOTYPE #4

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A002400080010-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 11
• Document Creation Date: December 22, 2016
• Document Release Date: September 20, 2011
• Sequence Number: 10
• Publication Date: August 17, 1953
• Content Type: REPORT

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1, 1;, NCE3- .T68'9
TEST REPORT
R3-2B RECEIVER
N.E.M.S. PROTOTYPE #4
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I I:vTPO')UCTION
ecuj 7~,t L-i"'.d'C?1
resubn.itted their prototype model of the R".-28 Radio Receiver to the
Research and Development Arar.cn of Co. rho En;;ineerin, or: July 17, 1953..
Our report dated A 'ril 22, 195), constituted a rejection of the set
as ori,;in,-kily suor..itt.'.ci. Tais report covers the acceptance tests
conducted on the latest model received.
;>ufficient t~3ts were conducted to insure that the manuficturer has
complied with the requests outlined in the first report, )n all but
a few minor poir.tr, prototype .14 meets specificntionr. This model of
the RR-29 receiver is considered to be an acceptable prototype;.
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TABLT OF CONTENT
1. MECHANICAL SECTION
1.1. MECHANICAL INSPECTION
2. ELECTRICAL SECTION
2.1. ELECTRICAL TESTS
2.1.1. ANTENNA INPUT I?.MEDANCE
2.1.2. SELECTIVITY
2.1.3. SENSITIVITY
2.1.4. STABILITY
2.1.4.1. Fri.''. U':!NCY STABILITY DURING WARN-UP
2.1.4.2. FREt)UNCY STABILITY VS. SUPPLY VOLTAGE VAR.L\TIO,'
2.1.4.3. HAND CAPACITY EFFECTS
2.1.4.4. MECHANICAL STABILITY
2.1.5. IMAGE REJ:C;CTION RATIO
2.1.6. I.F. REJ~,C,'ION RATIO
2.1.7. SPURIOUS RESPON 3h, REJTECTI')N RATIO
2.1.7.1. EXTERNAL SPURIOUS RESPONSE
2.1.7.2. I;:TEX2'AL SIU..1JI`C ~~ SI'O,~Sr
2.1.8. OVERALL AUDIO FRE",UI.'CY RESPONSE
2.1.9. CROSS SIGNAL DI.5TJRT.IOTl P1tUJUCTS
2.1.10. CRYSTAL F.F.N. 7T'ERATIO^I
2.1.11. 2. F . OPERATION'
2.1.12. DIAL CALIBRATION ACCURACY
2.1,13. RESETTA BILI T Y
3. CONCLUSION
Page
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1.1 , TCHA"ICFL I? `3'~ ,CTI~?
Satisfactory measures were taken by the manufacturer to correct
the mechanic-,I defects noted during the inspec.i-)r. of the )ri,-inal
RR-2B protot.Toc, A sub.,nersiun test was not coiisiaered necessary
on this model due to the excellent results oot-iined in previous
tests,
2. F1r,CTIZICAL C~.CTI)N
L T.,7i:P3
NTF.I':NA I"~PUT I, 'rD11t:CF
Fru:quenc 5c1 .~, I ,ipedar.ce t~}vas)
3.0
4, 5
6,0
12.0
102
lr'.0
95
24,0
315
200
200
484
6,0
314
9.0
282
12.0
848
The test was conducted in accordance with the following specifi-
cation: No. 50?, ?1J03?-' , Para. C-13.
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2.1.2. SELECTIVITY
DB Down Bandwidth (kc/s)
6
2.890
20
7.620
40
14.870
60
23.180
Test Frequency - 4.5 mc/s
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The test was conducted in accordance with the following specifi-
cation: No. 50-A-1003-A, Para. F-2.
2.1.3. SENSITIVITY
Frequency Raw No..e mw
10 D3 3 (uv)
Band
me .i A;?I Cad
A
CW
3.0 0.18 0,49
1.35
3.5 0.36 0.91
1.50
1
4.1 0.49 1.11
1.50
4.8 0.36 0.81
1.40
5.5 0.56 1,21
1.35
6.0 0.72 1.44
1.30
6.0 0.04
0.16
1.25
7.0 0.06
0.20
1.25
2
8.2 0.08
0,25
1.30
9.6 I 0.04
0.18
1.20
11.0 0.06
0.20
1.05
12.0 0.14
0.
0.90
12.0 0.01
0.03
1.20
14.0 0,02
0.11
1.35
3
16.4 0.05
0.20
1,30
19.2 0.01
0.06
1.45
22.0 0.02
0.09
1.65
24.0 0.06
0.25
1.25
* The CW sensitivity was better than the AM sensitivity.
The tests were conducted in accordance with the following speci-
Para. F-1.
Ir"
fications and modifications: No. 50-'-1003-A,
11 October 1950, Para. 3.2.4. & 4.2.6.
No. 52-A-1022-A, Para. 2,2.
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2.1.4. STY ILITY
2.1.4.1. F:,F, UE JCY
The results obtained by the contractor under Navy inspection
were acceptable.
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This test was conducted in accordance with the following speci-
fications and modifications: No. 5C-~-1003-A, Para. F-4.
No. 52--.A-1022-A., Para. 1.3.
2.1.4.2. FRFf`UENCY STABILITY VS. q SUPPLY VOLTAGE VARIATION
Supply Deviation
_ (Volts-)
110
105
100
95
l 90
0
50
100
250
1s
17me
0
100
280
630
Band 3 _Q ^ic
0
2560
6800
approximate point where H.F.O. quit
The RP-1 power supply was set for 110 volts and the input was
varied with a variac.
2.1.4.3. HAND CAPACITY EFFECTS
The RR-2B receiver was practically immune to the effects of hand
capacity upon its frequency.
2.1.4.4. MECHANICAL STABILITY
Jarring and other rough handling did not cause excessive fre-
quency shift.
Band _ 1 5 ac
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2.1.5. Ii,AGE REJr-,CTION RATIO
f
Test Frequency
Band
me s
Rejection Ratio
1
6.0
1/100 - 40 db
2
12.0
1/50 - 34 db
3
24.0
1/100 - 40 db
Par,- 4
This test was conducted in accordance with the following speci-
fications and modifications: F:o. 50-A-1003-A, Para. F-3.
11 October 1950, Para. 4.2.4.
No. 52-it-1022-A, Para. 1.2.
2.1.6. I.F. REJ',CTION RATIO
Band
Test Frequency
me s
I.F. Frequency ?
me
Rejection Ratio
(db)
1
6.0
0.455
1
100 /
2
12.0
0.455
100 ,L
3
24.0
0.455
100
2.1.7. SPURIOUS RESPON31 R JECTION RATIO
2.1.7.1 EXTERNAL SPURIOUS RESPONSE
Receiver
Spurious
Response
Band
Fre uenc me s
Fre uenc me s
(db)
3.0 none
----
4.5 4.75
69.5
1
6.0 6.25
69.6
6.0 12.50
79.0
6.0 13-40
78.59
6.0 6.25
73.7
2
9.0 9.25
63.7
12.0 12.25
74.0
12.0 12.75
74.5
12.0 12.25
70.0
3
18.0 18.25
62.9
24.0 24.25
52.7
24.0 24.75
77.7
This test was conducted in accordance with the following specifi-
cations and modifications: No. 50-A-1003-A, Para, F-6,
No. 52-A-1022-A, Para. 1.4.
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Pa.s~;e 5
2.17.2. I TEA i1Y,SPJP,SE
No internal snurious responses were. detec`.ed in the R3-2B receiver.
2.1.8. OVERALL AUDIO FRS' UEIICY RESPONSE
Frequency (c/s)
40
70
100
200
400
700
1000
2000
4000
Response (db)
-12.00
- 7.50
- 5.00
- 2.00
0
- 0.50
- 2.00
- 9.00
-17.00
Test Frequency - 10.7 mc/s
2.1.9. CROSS SIGNAL DISTORTION PRODUCTS
land
Frequency ""Ic
Des?.ponse db
1
5.45 (Difference Frequency)
76.4
5.95 (Sum Frequency)
73.6
2
11.45 (Difference Frequency)
83.1
11.95 Sun: Frequency)
80.4
3
23.45 (Difference Frequency=)
100
I
_5
2 3. 9 Sum Frequency)
100
This test was conducted in accordance with the following specifi-
cations and modifications: No. 50-A-1003-A, Para. F-7.
No. 52-A-1022-A, Para. 1.5.
2.1.10. CRYSTAL N.F.O. OPERATInAT
Receiver
Crystal
Sensitivity
Rand
Frequency me s
Frequency me s
AM - (uv)
1
4.345
4.100
1.35
2
9.145
4.8OO
0.90
1P.145
6-200
2.90
This test was conducted in accordance with the following specifi-
cations and modifications: No. 50-A-1003-A, Para. F-5.
11 October 1950, Para. 4.2.3.
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The BR-2B B.F.C. mcots the requirements of the following speci-
fications and modifications: No. 50-;?.-1:;O3.-'. , Par--_ C-15.
11 OC Lo er 19>C, 4.2.5.
No. Par , 2.1,
:tecciver Dial
Error
Error
Band
;Cttiri :ac s
c
Parts it 1300
3.0
1840
1.10
1
3.9
2230
1.03
5.1
6480
2.29
6.0
-1740
0 , .'
6.0
5900
1.77
2 1
7.8
4750
1.10
10.2
18350
3.24
12.0
2 280
3.49
12.0
5850
0.88
3
15.6
10760
1.24
20.4
47860
4.22
24.0
16700
102
This test was conducted in accordance with the following speci-
fications and modifications: No. 50-A-1003-A, Para, C-10.
11 October 1950, Para. 4,.',-i,
2,1.13, RESETTABILITY
Band
Frequency
Error
Error
me :
(c/3)
F-',_ r. t s in 1800
1
4.5
590
0.212
2
9.0
850
0,170
13.0
2100
0.210
This test was conducted in accordance with the following speci-
fications and modifications: No. 50-A-1003-A, Para. C-11.
11 October 1950, Para. 4.2,1.
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Page
C0I CLUSION
The resubmitted RR-213 prototype failed to meet specifications in only
two testa. In the first, External Spurious Response:, a number of
relatively weak spurious signals were found. cV'ith two exceptions
they followed a definite pattern, being located 250 kc/s and 750 kcjs
above the receiver frequency in each case. Also the Cross Signal
Distortion Productas test disclosed that the rej?;ction of bands 1. and
2 was below the specified 90 db.
Neither of these defects was considered to be of sufficient importance
to warrant rejection of this prototype (,*4), although the contractor
should continue his efforts to improve them.
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CONF
DENTAL
r
~~~J 11 ~ ~
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