Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 97

CIRCUIT DESCRIPTION
RF GAIN
CONTROL-
OUT
2ND IF
IN
10.7 MHz
FILTER
SW A4A1
BWSEL
2ND IF
10.7 MHz
455 kHz
CONV.
A4A2
3RDLO
3RD IF
455 kHz
F.uTER
SW
A4A3
3RD IF
BFO
455 kHz
IF AMP/
DEMOD
A4A7
4VJ-8718-19/FE HF RECEIVER
RF AGC
IF AGC
-»» IF OUT
AM AUDIO
AGC A4A6
3RD IF
FM/CW/SSB
DET.
A4A9
FM/ '
CW/
SSB
AUDIO
AUDIO AMP
A4A10
LINE AUDIO
OUT
.FM/CWSEL AM
SEL
MODE
SEL
GAIN CTRL/SS
MONITOR
AUDIO
LINE
AUDIO
LEVEL
LINE AUDIO
MONITOR
Figure 3-5. IF/Demodulator Section Block Diagram
3-14