Garmin APOLLO GX SERIES Service Manual - page 144
of
166
Garmin AT
Rev --
10-14
GX Service Manual
© 2004 Garmin AT
2-Pol
e B
P
F
V
ar
acto
r
T
une
d
2-Pol
e B
P
F
V
ar
acto
r
T
une
d
R
F
AGC
A
m
p
lif
ier
V
ar
acto
r
C
ont
rol
DAC
V
ar
acto
r
S
calin
g
A
m
p
lif
ier
AM/
F
M
C
ont
rol
S
w
itch
3rd IF
Amp
21.
4 MHz
2-Pol
e
X
tal F
ilter
RF
Amp
Audi
o
De
te
ct
or
Rx
RF
D
etected
Audi
o
21.
4 MHz
6-Pol
e
X
tal F
ilter
1s
t IF
Amp
2nd IF
Amp
IF AGC
A
m
p
lif
ier
Rx
LO
(134
40
to
IF AGC
Vol
ta
g
e
R
F
AGC
Receiv
er
P
res
electo
r
IF a
nd AGC
µwi
re
in
ter
face
Figure 10-9. Receiver Block Diagram