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1-5.
1-6.
ELECTRICAL
DESCRIPTION.
The
AS-10
is
a completely
solid-state
second-generationmodulation monitordesigned to
decode C-QUAM
AM
ste
reo. Advanceddecoding techniques such
as
a single
RF
AGC cir-
cuit
and
digitalpilotdetection provide accurate
and
reliable signalmonitoring.
AS-10
me-
tering
features includeanalog modulation meters. a
high
resolution moving
bar
LED RF/
pilotlevel display. two acljustable peak modulationindicatordisplays.
and
three
fixed peak
modulation indicators. An exclusive modulation
meter
autorange
feature
allows
the
opera-
tor
to conveniently observe a wide range ofsignal levels.
Front
and
rear
panel
test
recep-
tacles provide
the
operator
with
convenient access
to
the
decoded audio signals.
1-7.
DECODING
CIRCUITRY.
The
AS-10 decoding circuitryemploysa singleRFAGC circuit
at
the
signal input.
This
type
of
circuitexhibits accurate
and
stable decoding
and
elimi-
nates
tracking
errors
inherent
in
dual
AGC decodingcircuitry. Precision filters
in
the
de-
codingcircuiteliminate overshoot
and
enhance modulationmonitoring accuracy.
The
de-
codingcircuitryalsofeatures a digital pilotdetection circuitwhich providesincreasedpilot
detection stability
and
reliability. ·
1-8.
METERING
CIRCUITRY.
The
meteringcircuitry consists
of
a combination
of
analog
and
LED displays. Two analog
meters
present
the
left/L+Rchannel
and
right/L-R
channel
modulation level parameters. Modulation
meter
range
is
displayed on a six LED
range
display. An exclusive
auto
ran
ge
feature alJows
the
operator
to
convenientlyobserve a wide
range
ofmodulation levels without
manual
meter
acljustment. Two a<ljustable peak modu-
lation indicatordisplays alJow monitoringofleft/L+Rchannel
and
right/L-R
channel
modulation
parameters
from 0% to 133%.
1-9.
Carrier/pilotlevel
parameters
are
presentedon a
high
resolutionmoving
bar
LED
display.
+125% L+R.
-100%
L+R, 100%
L-R,
and
pilot tone
parameters
are
displayed on individual
peak indicators. Metering
parameters
are
se
lected from front
panel
microswitches with
LED indicatorsto provide easyrecognition
of
operationalparameters.
1-10.
PHYSICAL
DESCRIPTION
.
1-11.
The
AS-10 circuitry
is
designed
in
modularassembliestopr~vide
ease
of
maintenance. A
hinged
upper
circuitboard alJows convenientaccess to lower circuitboardcomponents.
Front
and
rear
panel
audio receptacles
are
providedfor convenient
test
equipmentconnec-
tions.
1-12.
EQUIPMENT
SPECIFICATIONS.
1-13.
Refer toTable
1-1
for
the
electrical. physical,
and
environmental specifications
of
the
AS-10
AM
stereo modulation monitor.
1-2
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