Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 121

CIRCUIT DESCRIPTION
WJ-8718-19/FE HF RECEIVER
3-38
MAN
VOLTS
!
SUMMER
U2B
AGC AMP
U1D
IF
AM
PEAK
DET
Q1.CR2
THRSHLD
DET
U1A.Q2
^ r
GC
AUUIU H
i
Q6
FST/
t
THRSHLD
DET/SHAPER
Q5.U2A.C.D
fc RF
GC
SLOW SEL
AGC SEL
METER
AMP U1C
SHAPER
CR6-CR8
SS
^MTR
(AGC)
SS
^ MTR
(MAN)
Figure 3-19. AGC Block Diagram