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CHANNEL GUARD ENCODER/DECODER MODEL 4EK16A10
Rev. B
-
To i n c r e a s e s t o p - b a n d a t t e n u a t i o n .
Changed R 8 .
Rev. C
-
To o p t i m i z e f r e q u e n c y r e s p o n s e .
Changed C29.
TONE REJECT FILTER 19C311797-G2
Rev. A
-
To o p t i m i z e f r e q u e n c y r e s p o n s e .
Changed C29.
CHASSIS
&
RF ASSEMBLY 19E500881-G1 t h r u -G4
Rev. D
-
To e l i m i n a t e s q u e l c h o p e n i n g thump i n r e c e i v e r s w i t h C h a n n e l Guard.
Removed
w h i t e - o r a n g e
wire
b e t w e e n 5443-13 a n d TB2-1.
Added a w h i t e - o r a n g e
wire
be-
tween P312 ( o n 5 1 7 o n I F a u d i o a n d s q u e l c h b o a r d ) a n d TB2-1.
Rev. E
-
To s t a b i l i z e t h e t r i p l e r s t a g e .
Removed C9 on A413/A414.
Rev.
F
-
To i m p r o v e s e n s i t i v i t y when u s e d w i t h d u a l f r o n t - e n d .
Added C441.
Changed
DC
f e e d p o i n t o f R4 t o C441-2.
Jumpered C441-1 t o C421-1.
SCHEMATIC DIAGRAM W A S
:
A421
HI IF
AMP
--
Q
I
-I---
I
A-
300
HZ1
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