T h e S q u e l c h s i g n a l ( S D V ) f r o m P i n 1 6 b e c o m e s " L " a n d t h e s q u e l c h o p e n s .
I n c a s e t h a t S q u e l c h V R i s s e t t o M A X , a l l o f t h e a n a l o g u e s w i t c h e s i n I C 9 a r e
t u r n e d O F F , a n d t h e v o l t a g e o f P i n 1 5 i n c r e a s e s .
S e c o n d l y t h e v o l t a g e a r e c o m
p a r e d i n I C 2 , t h e S q u e l c h s i g n a l ( S D V ) f r o m P i n 2 1 b e c o m e s " H " , a n d t h e s q u e l c h
c l o s e s .
I C 3 0 4
Q5
Q
6
Q7
Q
8
3) Power Supply Circuit
VHF Power Supply Switch Circuit and Unlock Circuit
I n t h e r e c e i v i n g m o d e , " H " i s o u t p u t f r o m P i n 4 o f S h i f t R e g i s t e r I C 8 a c c o r d i n g t o
t h e s e r i a l d a t a f r o m C P U , a n d Q 3 0 a n d Q 2 9 a r e t u r n e d O N , t h e n 8 V i s a d d e d t o
8 R V l i n e .
I n t h e t r a n s m i t t i n g m o d e , j u s t s a m e a s r e c e i v i n g , " H " i s o u t p u t f r o m P i n 5 o f I C 8 ,
a n d Q 3 2 a n d Q 3 1 a r e t u r n e d O N , t h e n 8 V i s a d d e d t o 8 T V l i n e .
W h e n P L L i s u n l o c k e d , t h e u n l o c k s w i t c h Q 3 8 i s t u r n e d O N b e c a u s e " H " i s o u t p u t
f r o m P L L - V C O u n i t U L t e r m i n a l .
T h e n 8 T V s w i t c h 0 3 2 i s t u r n e d O F F .
A c c o r d i n g l y t h e t r a n s m i t t i n g i s e n a b l e w h e n P L L i s u n l o c k e d b e c a u s e 8 T V l i n e
d o e s n o t w o r k .
UHF Power Supply Switch Circuit and Unlock Circuit
I n t h e r e c e i v i n g m o d e , " H " i s o u t p u t f r o m P i n 4 o f S h i f t R e g i s t e r I C 3 0 4 a c c o r d i n g t o
t h e s e r i a l d a t a f r o m C P U , a n d 0 3 3 2 a n d 0 3 3 0 a r e t u r n e d O N , t h e n 8 V i s a d d e d t o
8 R V l i n e .
W h e n t r a n s m i t t i n g t h e s i g n a l , j u s t s a m e a s r e c e i v i n g , " H " i s o u t p u t f r o m P i n 5 o f
I C 3 0 4 , a n d 0 3 3 3 a n d 0 3 3 1 a r e t u r n e d O N , t h e n 8 V i s a d d e d t o 8 T V l i n e .
T h e U n l o c k S w i t c h 0 3 3 4 i s t u r n e d O N w h e n P L L i s u n l o c k e d ,
b e c a u s e " H " i s
o u t p u t f r o m P L L - V C O u n i t U L t e r m i n a l , a n d 8 T V S w i t c h 0 3 3 3 i s t u r n e d O F F .
A c c o r d i n g l y t h e t r a n s m i t t i n g i s e n a b l e w h e n P L L i s u n l o c k e d b e c a u s e 8 T V l i n e
d o e s n o t w o r k .
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Содержание DR-610E
Страница 32: ...f m 1 k H z T a 2 5 C ro o AF OUTPUT 0 0 1j j F All manuals and user guides at all guides com...
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Страница 83: ...V j Ni VHF VCO UNIT All manuals and user guides at all guides com...
Страница 84: ...C O UHF PLL UNIT All manuals and user guides at all guides com...
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