IMPORTANT
Several improvements to the basic models 201A and 201B ADF Receivers require that both the units part
number and model number be specified when ordering replacement parts.
Beginning with 3D042 schematic issue "L" (Model 201A, BReceiver) i-f transformers T3, T4 and T5 have
been changed to narrow band types no. 90D069-01). Narrow band receivers operate on a1500 cps band¬
width. Broad band receivers (units before schematic issue L) operate on 3500 cps bandwidth. Broadband i-f
transformers T3, T4 and T5 are part numbered 90D028-01 on transformer can.
In addition to the change from broadband to narrow band i-f transformers, changes to the tuning capacitor,
module and oscillator module (beginning with schematic issue S) have made it necessary to create
model numbers 201A-1 and 201B-1. The following table is given to facilitate ordering of replacement parts.
mixer
PART NUMBER AND MODEL REFERENCES
MODEL
PART NUMBER
201A
201B
1U022-01
1U022-02
1U022-01
1U022-02
1U022-03
1U022-04
R e c e i v e r s w i t h w i d e - b a n d
i-f transformers (90D028-01)
R e c e i v e r s w i t h n a r r o w - b a n d
i - f t r a n s f o r m e r s ( 9 0 D 0 6 9 - 0 1 )
R e c e i v e r s w i t h n a r r o w b a n d
i - f t r a n s f o r m e r s a n d s u b s e q u e n t
changes
R e c e i v e r w i t h n e w
look panel
201A
201B
201A-1
201B-1
201C
201D
1U022-05
1U022-06
PART NUMBER DIFFERENCES
M O D E L S 2 0 1 A - 1 / B - 1
M O D E L S 2 0 1 A / BSYMBOL
VALUE/TYPE
VALUE/TYPE
PART NO.
PART NO.
NO.
S10041-CB-22K
NOT USED
C25
22nni
NOT USEDS10041-CB-22K
22^i^li
C27
S10041-UA-5K
5pfjf
S10041-RD-43KC29
43ppf
140wf
S10087-C-141J3
S10087-C-430K3C33
43fx/if
NOT USED
SOOfXfif
S10087-C-301G3C34
S10041-UA -5K
5wf8.2/ijif
S10041-UH-8R2KC35
390fx^if
S10087-C-391G3C36
680/anf
S10087-C-681G3
giOpMf
S10087-C-911G1
C37
1700pfxf
S10088-C-172G3
1800^i^f
S10088-C-182G3C38
3600/jfxf
S10088-C-362G3
C40
22nnf
S10041-CB-22K NOT USED
NOT USEDC42
33ixfif
S10087-C-330G3
NOT USEDCR6 S12002-102Tl-53
L7 90D029-03 90D029-13
90D029-15L8 90D029-07
L9
90D029-1790D029-11
LIO 90D029-04 90D029-14
Lll 90D029-08 90D029-16
L12
90D029-12 90D029-18
Q5* S12001-0572N1639 2N2654 S12001-083
3 . 9 K o h m s 1 / 4 W 1 8 0 o h m 1 / 4 W
R24
S110U-392K S11011-181K
*The transistor type used for Q5 in Models 201A/B is not interchangeable
with the type used for Q5 in Models 201A-1/B-1.
F i g u r e 4 1 0 . M o d e l 2 0 1 A , B R e c e i v e r s , Ta b l e o f P a r t s D i f f e r e n c e s .
April 1965
(Revised March 1969)
Page 411
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General