Specifications

Chapter 10 295
Block Diagrams
Audio Analyzer Section
Figure 10-7 Audio Analyzer 1, A2A80
50 Hz
300 Hz
300 Hz
3 kHz
15 kHz
A3A2
PEAK
A3A1
OPT
0/20/40
GAIN
AMP
FIL ID 1
DET
INPUT PEAK VOLTAGE
A3A3
OPT
FILTER 1 SELECT
FILTER 2 SELECT
FILTERED
AUDIO
OUT
FIL ID 2
+
-
GAIN=1
FLOAT/
GND
AUDIO IN LO
AUDIO IN HI
+
-
10
AUX 3
AUX 4
AUX 1
AUX 2
MON
OUT
DEMOD
LF INPUT SELECT
INP SEL
FLOT/GND
LF GAIN 1
FIL 1 SEL FIL 2 SEL
RESET PK
OVER VOLTAGE
IO
CK
D
EN/I
+12.4
+5.1
-12.4
GND
GROUP
SERIAL IO
FROM
RCVR
DC-25 kHz
TO
FREQ
CNT
TO
VOLTMETER
INPUT
VOLTAGE
MEAS
BY-PASS TO
AUDIO ANALYZER 2
B
B
A
AUDIO
ANALYZER 2
FROM
MOD DIST
TO MEASUREMENT