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SUPPLEMENTAL ALIGNMENT PROCEDURES
7 0 - 3 4 2 / 4 4 2 ~ ~
RF
-
I F ALIGNMENT
3 .
C o n n e c t a n o n - c h a n n e l
s i g n a l g e n e r a t o r t o t h e a n t e n n a c o n n e c t o r .
A d j u s t L 2 0 1 ,
L202 a n d L 2 0 4 , L 2 0 5 a n d L 2 0 6 f o r a maximum i n d i c a -
t i o n a t CM202 p i n 2 ( T e s t S e t p o s i t i o n 3 ) .
4 .
A d j u s t L 2 0 8 a n d L 2 5 1 f o r minimum a u d i o d i s t o r t i o n .
QUADRATURE COIL ALIGNMENT
5 .
A d j u s t L 2 5 2 f o r maximum a u d i o o u t p u t .
TIGHT SQUELCH ADJUSTMENT
6 .
A d j u s t RV251 f o r t h e d e s i r e d t i g h t s q u e l c h s e n s i t i v i t y .
ADDITIONAL ADJUSTMENT POINTS
TRANSMITTER/SYNTHESIZER B O A R D
RV102
-
M i c r o p h o n e G a i n C o n t r o l .
A d j u s t n e a r t h e c e n t e r p o s i t i o n a n d
p e r f o r m t h e s t a n d a r d s e r v i c e m a n u a l m o d u l a t o r a l i g n m e n t .
I n p u t a 1 5 0
M V
RMS 1 KHz s i g n a l a t t h e m i c r o p h o n e a u d i o i n p u t a n d a d j u s t RV102 t o
g i v e 2 . 5 KHz d e v i a t i o n o n t h e t r a n s m i t t e d s i g n a l .
L 1 1 8
-
T r a n s m i t I F .
M o n i t o r I C 1 0 6 p i n 1 4 w i t h a n RF v o l t m e t e r o r
o s c i l l o s c o p e .
A d j u s t L 1 1 8 f o r t h e maximum l e v e l o f t h e T r a n s m i t I F
s i g n a l .
L 1 1 0 ,
L 1 1 1 , L 1 1 2
-
T r a n s m i t V C O .
I n s t a l l a n E/PROM p r o g r a m m e d f o r a
t r a n s m i t f r e q u e n c y a t t h e c e n t e r o f t h e u n i t ' s
o p e r a t i o n a l r a n g e .
M o n i t o r t h e t r a n s m i t V C O s i g n a l a t I C 1 0 4 p i n 11 w i t h a n RF v o l t m e t e r
o r h i g h f r e q u e n c y o s c i l l o s c o p e .
A d j u s t L l l O a n d L l l l f o r maximum
s i g n a l l e v e l w h i l e i n t h e t r a n s m i t m o d e .
M o n i t o r t h e j u n c t i o n o f
L 1 1 6 ,
C 1 5 9 a n d C 1 6 0 w i t h t h e RF v o l t m e t e r o r o s c i l l o s c o p e .
A d j u s t
L 1 1 2 f o r maximum t r a n s m i t V C O s i g n a l l e v e l w h i l e i n t h e t r a n s m i t m o d e .
L 7 0 7 , L 7 0 8 ,
L 7 0 9
-
M a i n V C O .
I n s t a l l a n ElPROM p r o g r a m m e d f o r a r e c e i v a
f r e q u e n c y a t t h e c e n t e r o f t h e u n i t ' s o p e r a t i o n a l r a n g e .
M o n i t o r t h e
L o c a l O s c i l l a t o r i n j e c t i o n s i g n a l a t 5 3 6 5 w i t h a n RF v o l t m e t e r o r h i g h
f r e q u e n c y o s c i l l o s c o p e a n d a d j u s t L 7 0 9 f o r maximum s i g n a l l e v e l .
Mon-
i t o r I C 7 0 3 p i n 2 w i t h t h e RF v o l t m e t e r o r o s c i l l o s c o p e a n d a d j u s t L707
a n d L 7 0 8 f o r maximum s i g n a l l e v e l .
R E C E I V E R B O A R D
RV252
-
Maximum A u d i o O u t p u t C o n t r o 1 : I n p u t
a s t a n d a r d t e s t s i g n a l a n d
t u r n t h e r a d i o v o l u m e c o n t r o l maximum c l o c k w i s e .
A d j u s t RV252 t o
.
y i e l d t h e maximum o u t p u t p o w e r n o t e x c e e d i n g 1 0 % d i s t o r t i o n .
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