MODEL 8559A
SERVICE
A12
STEP
GAIN
0
-
12 dB CONTROL
REF LEVEL WP
\
1
REF LEVEL CY
2ND
10 dB
20
dB 20 dB
AMPLIFIER
AMPLIFIER AMPLIFIER
I
21.4
MHz
(
IF61
IF62
I
St1 FLATNESS
BAND
MIXER DIODE BIAS
.Ol-s
6-g
r
H2 BAND
SELECT
::is
DIODE BIAS
DECODER
,'
-
12.1
-
21
/
9
0 0
9
FIGURE
858.
STEP GAIN ASSEMBLY AIL, BLOCK DIAGRAM