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APPENDIX
V
HF- MlD
Band
Alignment for 20-9135
Circui t Rev
ision
1. The following
parts
should be changed as shown below:
Ref
.
No.
Lo band
Mid band
Cl03
0.001
j.1
F
33pF
Cl07
O.OOlj.1F
33pF
C191
47pF
3pF
C192
33pF
27pF
C193
33pF
15pF
C194
0.001
j.1
F
39pF
0
119
BB609A
Not used
L1 0
1
4LNC-092
4LNC-122
r
ro
i
7SSR-278
7SSR-287
Tl02
7SSR-278
7SSO-281
2
.
A
dd
0
9 and 0
12,
and remove 011.
St ep
3
:
St ep 4:
I
Step 5
:
VCO
Al
ignment
Step 1:
Connect a OC SSVM to TP103 and ground
.
St ep 2:
Program CH1
,
2 and 3 as follows:
CHl (68 MHz), CH2 (78 MHz), CH3 (88 MHz)
Select channel 3 (88 MHz) and adlust TC103 for 12.0 V on the OC SSVM.
Select channel
1
(68 MHz) and adlust
Tl07
tor 1.5 V on the OC SSVM.
Repeat steps 3 and 4 until no improvement is observed.
The OC
SSVM should show as below.
68 MHz Voltage of TP103 1.4-1.6 V
78 MHz Voltage of TP103 6.0-7
.0
V
88 MHz Voltage of
TP103 11.5-12.5 V
RF Am
p
Alignment
Step
1:
Connect
inst rument s as shown below:
Scope
.
ac
TP101
(
~
Unit
f\
Under Test
I
" ,
r,'r
V
H
Sweep
~
0
Generator
~
68
MHz~88
MHz
Jr
,.,.
Ant
J
k
Step
2:
Step
3:
Step
4:
Program 68 MHz (CH1), 78 MHz (CH2l, 88 MHz (CH3).
Select
Channel 1 (68 MHz) and adiust Tf O'l and
n
02 for maximum RF waveform
.
Check t
he
Channels 1
~3
one
ov
one for maximum RF waveform.
Slight deviation as shown below is acceptable.
0
-
C J
"
-
6
-
'"
I
U>
c
I
0
I
I
o,
U>
'"
I
I
a:
,
I
I
68
78
Freq (MHz)
88
-55 -
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