Advertisement
th is (e a c h n u m b e r on the s ta tio n s e l e c t o r k n ob r e p r e s e n t s
30 d e g r e e s . )
15.
If m o r e than a 30 d e g r e e c h a n g e in fin e tunin g t r i m m e r
w a s
n e e d e d
in
s te p
14, a d ju s t
( L - 7 ) b y s p r e a d in g o r c o m p r e s s i n g u n til the 30 d e g r e e r e
q u ir e m e n t is m e t.
N O T E :
E a c h a d ju s tm e n t o f c h a n n e l 13 o s c i l l a t o r c o i l w ill
n e c e s s i t a t e
a
r e - c h e c k i n g
o f the o s c i l l a t o r t r i m m e r C -1 2
on c h a n n e l 12 as p e r s t e p s 6, 7, 8 & 9 .
16.
C h e c k c h a n n e ls 12, 11, 10, 9 , 8, and 7 b y n o tin g w h e th e r
the fin e tunin g t r i m m e r c a n d r o p the sou n d m a r k e r f o r e a c h
ch a n n e l in the t r a p d ip b y a 30 d e g r e e r o t a t io n .
c h a n n e ls d o e s n ot m e e t the 30 d e g r e e r e q u ir e m e n t , a c o m
p r o m i s e m u s t be m a d e b y r e s e t t in g c h a n n e l 9 o r 12, w h ic h
e v e r is c l o s e r to the c h a n n e l in q u e s tio n .
E x a m p le s :
1.
If c h a n n e l 11 d o e s n o t m e e t the 30 d e g r e e r e q u i r e
m e n t, r e tu r n s t a t io n s e l e c t o r and g e n e r a t o r to c h a n
n e l 12 and tune c e r a m i c t r i m m e r C -1 2 to w a r d c h a n
n e l 11 ( t r i m m e r fr e q u e n c i e s
s c r e w ) .
T h is
w i l l te n d
m a r k e r ou t o f the t r a p d ip , bu t t h is c a n be c o m p e n
s a te d f o r b y the fin e tunin g t r i m m e r .
t r i m m e r an y m o r e then i s n e c e s s a r y to g e t the c h a n
n e l in q u e s t io n b a c k w ith in the 30 d e g r e e r e q u i r e
m e n t.
2.
If c h a n n e l 10 d o e s n o t m e e t the 30 d e g r e e r e q u i r e
m e n t, m o v e s ta tio n s e l e c t o r and g e n e r a t o r to c h a n
n e l
9
and tune
the
t o w a r d
c h a n n e l
10 ( c o i l
t u r n s ).
T h is w i l l a l s o ten d to m o v e c h a n n e l 9 sou n d
m a r k e r out o f the t r a p d ip , but th is c a n be c o m p e n
s a te d f o r b y the fin e tunin g t r i m m e r .
a d ju s t the c o i l any m o r e than is n e c e s s a r y to b r in g
the c h a n n e l in q u e s tio n b a c k w ith in the 30 d e g r e e r e
q u ir e m e n t .
L-5 B
CH A N N EL 5
C H A N N E L 7
L -2
FIGURE 8.
ANTENNA, RF AND OSCILLATOR COIL LOCATIONS
c h a n n e l 13 o s c i l l a t o r c o i l
If on e o f the
l o w e r e d
b y tig h te n in g
to
m o v e c h a n n e l 12 sou n d
D o n o t a d ju s t
3 -t u r n
c o i l ( L - 4 M , F ig u r e 8)
f r e q
r a i s e d b y s p r e a d in g
A g a in , d o n ot
L -5 A
C H A N N E L 4
C H A N N EL 3
C H A N N E L 2
ANT. SECT.
-2 A
L-2 B
REAR VIEW OF
L-2 C
OSC. SECTION
L -4 C
L-4 M
Scanned by mbear2k - Jan 2012
17.
T ilr n s w e e p g e n e r a t o r and s t a t io n s e l e c t o r s w it c h to
c h a n n e l 6.
18.
A d ju s t c h a n n e l 6 o s c i l l a t o r c o i l (L .-4 E ,
that the sou n d m a r k e r f o r c h a n n e l 6 f a l ls in to the 2 1 .9 m e
t r a p d ip w ith the fin e tunin g t r i m m e r at m i d - c a p a c i t y (s h a ft
s l o t in h o r iz o n t a l p o s i t io n ).
c h a n n e l 6 o s c i l l a t o r c o i l in u n its o f 3 t u r n s .
tu r n s w i l l m o v e c u r v e t o w a r d sou n d m a r k e r , w h ile s p r e a d
in g w il l m o v e c u r v e t o w a r d v i d e o m a r k e r .
I M P O R T A N T :
S in c e
the
c o i l s
a lig n m e n t o f c h a n n e l 6 w i l l s i m p l i f y the p h a s in g o f the c h a n
n e ls to f o l l o w .
19.
A d ju s t c h a n n e ls 5 and 4 s o that the so u n d m a r k e r f o r
e a c h c h a n n e l f a l ls in to the 2 1 .9 m e t r a p d ip in the c u r v e w ith
the fin e tunin g t r i m m e r s e t no m o r e than 15 d e g r e e s f r o m
m i d - c a p a c i t y .
20 .
C h a n n e ls 3 and 2 s h o u ld b e a d ju s t e d s o that the sou n d
m a r k e r f a l l s in to the 21. 9 m e t r a p d ip w ith the fin e tunin g
t r im m e r w ith in 15 d e g r e e s o f m a x im u m c a p a c i t y .
CHANNELS 2 TO 6
----SOLID LINE INDICATES OPTIMUM
RESPONSE.
— DOTTED LINES INDICATES
P ERM ISSIBLE VARIATION.
FIGURE 9.
RF RESPONSE CURVES CHANNELS 2-6
CHANNELS 7 TO 13
FIGURE 10.
RF RESPONSE CURVES CHANNELS 7-13
F ig u r e 8) s o
A lw a y s
s p r e a d
o r c o m p r e s s
C o m p r e s s i n g
a r e
in s e r i e s , the p r o p e r
S
9
Advertisement
