Broadcast Electronics AS-10 User manual
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•
•
•
TABL
EOF
CONTENTS
PARAGRAPH
SECTION I GENERALINFORMATION
1-1
Introduction
1-3
Equipment
Description
1-5
Electrical Description
1-7
DecodingCircuitry
1-8
MeteringCircuitry
1- 10 Physical Description
1-12
EquipmentSpecifications
SECTIONil
INSTALLATION
2-1
Introduction
2-3
Unpacking
2-6
Installation Requirements
2-8
Installation
2-10
Preliminary
Insta
llation
2-12
CircuitBoard ProgrammingCheck
2-13
Input
Voltage Check
2-16
Placement
2-18
Wiring
2-19
RF
Wiring
2-20
Ground
2-21
RemoteIndications
2-22
Audio
Outputs
2-23
InstallationAdjustments
2-24
RF
Attenuator
SECTION
ill
OPERATION
3-1
Introduction
3-3
Controls
and
Indicators
3-5
Operation
3-7
PreliminaryOperation
3-9
RF/PilotLevel Monitoring
3-11
Input
Selection
3-13
Adjustable
Peak
Modulation IndicatorOperation
3-
15 Modulation
Meter
Operation
3-16
AutorangeOperation
3-1
7
Manua
l Operation
3-18
Polarity
Se
lection
3-20
Audio Monitoring
© BroadcastElectronics 1990
ALL RIGHTS RESERVED
Printed
in
the
U.S.A
-i
-
PAGE NO.
1-1
1-1
1-2
1-2
1-2
1-2
1-2
2-1
2-1
2-1
2-1
2-1
2-1
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-3
3-1
3-1
3-5
3-5
3-5
3-5
3-7
3-7
3-7
3-7
3-7
3-7
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PARAGRAPH
PAGE
NO
.
SECTION
IV
THEORY
OF
OPERATION
•
4-1
Introduction
4-1
4-4
Functional Description
4-1
4-5
RF
DemodulatorCircuitBoard
4-1
4-6
RF
Input
Circuit
4-1
4-9
Frequency Synthesizer Circuit
4-1
4-14
Automatic-Gain-Control(AGC) Circuit
4-2
4-18
RF
Level Circuit
4-2
4-19
DecodingCircuit
4-2
4-33
1-R
Audio Circuit
4-10
4-34
L+R Audio Circuit
4-10
4-35
PowerSupplyCircuit
4-10
4-38
Audio CircuitBoard
4-10
4-39
Audio
Input
Circuit
4-10
4-40
Audio DematrixCircuit
4-10
4-41
PilotDetection Circuit
4-10
4-45
I-M,+R
Indicator Circuitry
4-11
4-48
Left/L+RChannel Meter
Input
Circuit
4-11
4-53
Left/L+R Channel MeterAmp1ifierCircuit
4-12
4-60
Left/L+R Channel MeterMode ControlCircuit
4-12
4-66
Preset
PowerCircuit
4-13
4-67
HeadphoneCircuit
4-13
4-68
RegulatorCircuit
4-13
4-69
MeterCircuitBoard
4-13
4-72
Audio Control CircuitBoard
4-13
•
4-74
L+R IndicatorCircuitry
4-14
4-75
Left/L+R
Channel
Meter Control
and
4-14
IndicatorCircuitry
4-76
Left/L+RChannel A(ljustable Peak
4-14
IndicatorCircuit
4-7'1 RF/PilotLevel IndicatorCircuit
4-14
4-81
Interface CircuitBoard
4-15
SECTIONV
MAINTENANCE
5-1
Introduction
5-1
5-3
Safety Considerations
5-1
5-5
First
Level Maintenance
5-1
5-8
Second Level Maintenance
5-1
5-11
ElectricalA(ljustments
5-1
5-13
Test
Equipment
Preparation
5-2
5-15
Signal
Source-AX-10
Exciter
5-2
5-17
Signal Source-
C-Quam
SignalGenerator
5-2
5-18
RF
DemodulatorCircuitBoardA(ljustments
5-2
5-19
450
kHz
Band-Pass
Filter
Alignment
5-2
5-34
900
kHz
Notch
Filter
A(ljustments
5-5
5-51
1.8MHz Notch
Filter
A(ljustment
5-6
5-64
DecodingCircuitAlignment
5-7
5-88
AGC
CircuitA(ljustments
5-9
5-107
PilotTone Null
5-9
5-121
FrequencySynthesizerCalibration
5-10
•
5-138
RF
Level Calibration
5-11
-ii
-
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• PARAGRAPH PAGE NO.
5-152
Separation
5-12
5-174
Meter
CircuitBoardA<ijustments
5-13
5-175
Right
Channel/LeftCl)annel
Meter
Circuit
Board
5-13
A<ijustments
5-201
Audio CircuitBoardA<ijustments
5-14
5-202
Pilot
Level Calibration
5-14
5-214 +125%
L+R,-100%
L+R,
and
100%
~R
Peak
5-15
IndicatorA<ijustments
5-228
Pi
l
ot
Notch A<ijustment
5-17
5-243 Audio Control CircuitBoardA<ijustments
5-18
5-244
A<iju
sta
ble
Peak
IndicatorCalibration
5-18
5-258
OperatingFrequency Reprogramming
5-18
5-265
Troubleshooting
5-19
5-269
ComponentReplacement
5-20
5-275
Integrated
Circuits
5-23
SECTION
VI
PARTSLISTS
6-1
Introduction
6-1
SECTIONVII
DRAWINGS
7-1
Introduction
7-1
APPENDIXA MANUFACTURERS DATA
• A-1 Introduction A-1
LIST
OF
ILLUSTRATIONS
FIGURE NO. DESCRIPTION PAGE NO.
1-1
AS-10
AM STEREO MODULATION MONITOR
1-1
2-1
AS-10
CIRCUIT BOARD
JUMPER
AND SWITCH
2-2
PROGRAMMING
2-2
REMOTE INDICATORAND AUDIO WIRING
2-4
2-3
RF
ATTENUATORAND INDICATORS
2-5
3-1
AS-10
CONTROLS AND INDICATORS
3-6
4--1
AS-10
SIMPLIFIED SCHEMATIC
4--3
5-1
AS-10
RF
DEMODULATOR CIRCUITBOARD ACCESS
5-3
5-2
RF
DEMODULATORCIRCUIT BOARD ADJUSTMENT
5--4
CONTROLS
5-3
450
kH
z BAND-PASS FILTERALIGNMENT
5-5
5--4 MODULATION
METER
CIRCUITBOARD ADJUSTMENT
5-14
CONTROLS
5-5
AUD
IO
CIRCUIT BOARD ADJUSTMENTCONTROLS
5-16
5-6
AUDIO CONTROLCIRCUITBOARD ADJUSTMENT
5-19
CONTROLS
5-7
FREQUENCYSYNTHESIZERPROGRAMMING
5-21
5-8
TROUBLESHOOTINGTREE, L+RCIRCUIT
5-25
5-9
TROUBLESHOOTINGTREE,INTERMEDIATE FREQUENCY
5-26
• CIRCUIT
5-10
TROUBLESHOOTINGTREE,
~R
CIRCUIT
5-27
-iii
-
www.SteamPoweredRadio.Com
FIGURE
NO.
5-11
5-12
TABLE
NO:
1-1
3-1
5-1
6-1
DESCRIPTION
PAGE NO.
AUDIO CIRCUIT
BOARD
TROUBLESHOOTING
5-28
TROUBLESHOOTINGTREE, DEFECTIVE FREQUENCY
5-29
•
SYNTHESIZER
LIST
OF
TABLES
DESCRIPTION PAGE NO.
AS-10 ELECTRICAL, PHYSICAL,
AND
ENVIRONMENTAL
1-3
SPECIFICATIONS
CONTROLS AND INDICATORS
3-1
AS-10TROUBLESHOOTING
5-23
REPLACEABLE
PARTS
LISTS
6-1
•
••
-iv
-
www.SteamPoweredRadio.Com
•
•
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1-1.
1-2.
1-3
.
1-4.
I
MODEL
AS-10
AS-10
SECTION
I
GENERAL
INFORMATION
INTRODUCTION.
Information
presented
by
this
section provides a general description
of
the
Broadcast Elec-
tronics
AS-10
AM
Stereo
Modulation Monitor
and
lis
ts
equipment
specifications.
EQUIPMENT
DESCRIPTION
.
The
Broadcast
Electronicsmodel
AS-10
is
a totally
solid-state
modulation
monitor de-
signed to decode Motorola
C-QUAM
AM
stereo within
the
522
to
1620
kHz
AM
broadcast
band
(refer to
Figure
1-1).
The
unit
is
programmed
for 10
kHz
increment
operation with 9
kHz
increment
operation available from
an
optionalfeature.
The
following
text
presents
orderinginformation, optional features,
and
recommended s
pare
parts
kits
.
PART NO. DESCRIPTION
907-0
100-024
907-0100-324
907-0104
977-0004-004
977-0004-9
977-0005-004
AS-10
AM
Ste
re
o Modulation Monitordesignedfor
C-QUAM
system operation on a single specified
fr
equency
in
the
522
to
1710
kH
z
AM
br
oadca
st
band
. 10
kHz
increment
programming.
19 inch (48.21 cm) rack mount, 117V ac 50/60
Hz
operation.
AS-10
AM
Stereo
Modulation Monitordesigned for
C-QUAM
sy
ste
m operation on a single specified frequency
in
the
522 to
1710
kH
z
AM
broadcast
band
. 10
kHz
increment
program-
ming
. 19 inch (48.21 cm)
rack
mount,
220Vac 50/60
Hz
op-
eration.
9
kHz
incr
eme
nt
progr
am
mfogoption.
Recommended
spare
part
s
kit
for
the
AS-10
AM
stereo
modu-
lation monitor, 10 KHz. Includ
es
selected fuses,
meter
s,
cry
sta
ls,
and
switches.
Recommended
Spare
Par
ts
Kit
for
the
AS-10
AM
ste
r
eo
modulation monitor, 9 KHz. Includes selected fuses,
meters,
crystals,
and
switches.
Recommended semi-eonductor
kit
for
the
AS-10
AM
stereo
modulation monitor.
COPVlllGHT
©
1990
BROADCAST
ElECmoNICS.
N::
597-0105-1
FIGURE
1
-1.
AS-10
AM
STEREO
MODULATION MONITOR
1-1
IE§
.
BAOAOCAST
EL.ECTRONICS
INC
www.SteamPoweredRadio.Com
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
•
•
www.SteamPoweredRadio.Com
•
•
•
TABLE 1-
1.
AS-10
ELECTRICAL,PHYSICAL,
AND
ENVIRONMENTAL
SPECIFICATIONS
(Sheet
1
of
2)
PARAMETER
ELECTRICAL
OPERATI
NG
FREQUENCYRANGE
Standard
Optional
RF
INPUT
IMPEDANCE
RF
INPUT
LEVEL
SPECIFICATIONS
630
to
1710
kHz
as
specified.
Programmable
in
10
kHz
increments.
522
to
1710
kHz
as
specified.
Programmable
in
9
kHz
increments
.
50Ohms
.
500
mV
to
15V RMS.
RF
ATI'ENUATOR Adjustable from
O
dB
to
30
dB
in
6 dB increments.
Fine
adjustment: 0 dB
to
6 dB, AGC contro1led.
MODULATION METERCALIBRATION
~
0%
to
133%
(-20
dB
to
+2 dB).
MODULATION METER RANGE
MODULATION METERACCURACY
MODULATION METER FUNCTIONS
PEAKINDICATOR FUNCTIONS
ADJUSTABLE PEAKINDICATOR
REAR PANELOUTPUTS
Left
Chann
el
Right
Channel
L+-R
L-R
Pilot
• Left/Rightchannel
Audio
Imp
edance
Lefl/Rightchannel
Audio Level
HEADPHONEOUTPUT
AC POWERREQUIREMENTS
+2
dB
to
-70
dB, Autorange
or
manual.
±2%
at
100% modulation, 400
Hz
Reference.
Left/L+R,
Right/L-R.
+125% envelope.
-100%
envelope.
100%phase
.
From
0%
to
133
%.
Po
sitive
or
Negativeindication.
} 0.775V
RMS
equals
100%
modulation.
0.775VRMS
equals
5% pilotinjection.
600
Ohm
Load.
2.45V RMS
at
100% modulation.
2
watts
into
8
Ohms
.
90Vto 133Vac, 50/60
Hz
or
180V to 266V
ac
, 50/60
Hz
.
1-3
El§"
~INC
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TABLE
1-1.
AS-lOELECTRICAL,PHYSICAL,AND
.ENVIRONMENTAL
SPECIFICATIONS
(Sheet
2
of
2)
PARAMETER
PHYSICAL
DIMENSIONS
Width
Heighf
Depth
WEIGHT
ENVIRONMENTAL
AMBIENTTEMPERATURE
RANGE
MAXIMUM HUMIDITY
MAXIMUM
ALTITUDE
COOLING
~•BROADCAST
~
ELl!CTRONICS
NC
SPECIFICATIONS
.
19 inches (48.3 cm).
5.25
inches
(13.3 cm).
17
inches
(43.2 cm).
25
lbs
(11.3 kg).
'
+32°F
to
+122°F (0°C
to
+50°C).
..
95%, Non-<:ondensing.
15,000 feet above
sea
level (4572 m).
Natural
convection
and
conduction.
1-4
•
•
. . ••
www.SteamPoweredRadio.Com
••
•
•
2-1.
2-2.
2-3.
2-4.
2-5.
2-6
.
2-7.
2-8.
I
NTRODUCTION
.
SECTION
II
INSTALLATION
This
section contains information requiredfor
the
insta11ation
and
preliminarycheckout
of
the
BroadcastElectronics
AS-10
AM
stereomodulation monitor.
UNPACKING.
The
equipmentbecomes
the
property
of
the
customerwhen
the
equipmentis delivered to
the
carrier. Carefu
l1
y unpack
the
modulation monitor. Perform a visual inspection to de-
termine
that
no
apparent
damage
has
been incurred
during
shipment. All shippingmate-
rials
shouldbe
retained
until
it
is determined
that
the
unit
has
not
been damaged. Cl
aims
for damaged equipment
must
be
promptlyfiled with
the
carrier
or
the
carrier
may
not
ac-
cept
the
claim.
The
contents
of
the
shipment
should
be
as
indicated on
the
packinglist.
If
the
contents
are
incomplete,
or
if
the
unit
is damaged electrica
11
y
or
mechanically, notify both
the
carrier
and
Broadcast Electronics, Inc.
INSTALLATION
REQUIREMENTS.
Referto
the
environmental specifications
in
Table
1-1
and
ensure
a properoperational en-
vironmentexistspriorto
AS-10
insta11ation.
INSTALLATION
.
2-9.
Each modulation monitor
is
assembled, operated, tested,
and
inspected
at
the
factory prior
to shipment
and
is
readyfor instalJation when received. Prior to installation,
this
publica-
tion should
be
studied to obtain a thorough
understanding
of
the
operation, circuitry, no-
menclature,
and
installation requirements. Installation
is
accomplished
as
fol1ows:
1) Pre-
liminary Installation,
2)
Placement, 3) Wiring,
and
4) Installation Adjustments.
2-
10.
PRELIMINARY
IN
STALLATI
ON.
WARNING
WARNING
ENSURE
NO
PRIMARY
POWER
IS
CONNECTED
TO
THE
MONIT
OR B
EFORE
PR
O
CEED
ING.
2-11
. Refer
to
the
following information
and
perform
the
preliminaryinstallation procedures.
The
procedures will require
the
unit
be placed on a work surface with
the
top-pa
nel re-
moved. After completion
of
the
procedures,
rep
lace
the
unit
top-panel.
2-12.
CIRCU
IT
BOARD
PROGRAMMING C
HECK
.
The
AS-10
circuitboards
are
factory pro-
grammed
during
final test.
To
assure
the
circuitboard
jumpers
and
switches
have
not
be-
come dislodged
or
changed
during
shipment, refer
to
Figure
2-1
and
check
the
position
of
each circuitboard
jumper
and
switch.
The
unit
is
shipped from
the
factory with the NRSC
deemphasis enabled.
2-1
EEl
·~INC
www.SteamPoweredRadio.Com
~
~
l
J48
I[~
]
~
RSS
R86
~
c9
~
AGC
CIRCUIT
ENABLE
JUMPER
J31:
INSTALL
JUMPER
IN
POSITION
2-3
i
I)
,1
0 I
FREQUENCY
SYNTHESIZER
I
PROGIWl4ING
SWITCH
Sl:
REFER
TO
FACTORY
TEST
SHEETS.
,
vco
DISABLE
JUMPER
J4B: •
INSTALL
JUMPER.
DIGITAL
PILOT
DETECTION
CIRCUIT
TEST
JUMPER
J36:
INSTALL
JUMPER.
0 ~
0 ~
RIGHT
CHANNEL
DEEMPHASIS
JUMPER
JlO:
1)
INSTALL
JlO
TO
ENABLE
THE
NRSC
75uS
DEEMPHASIS.
2)
REMOVE
JlO
TO
DISABLE
THE
NRSC
75uS
DEEMPHASIS.
RIW
~
0
c~
Qi
LEFT
CHANNEL
DEEMPHASIS
JUMPER
Jll:
1)
INSTALL
J11
TO
ENABLE
THE
NRSC
75uS
DEEMPHASIS.
2)
REMOVE
Jll
TO
DISABLE
THE
NRSC
75uS
DEEMPHASIS
Jll~
gU46
•
FIGURE
2-1. AS-10
cm.COIT
BOARD
JUM..
AND
SWITCH
PROGRAMMING
cOP"t'Rl(.tfl(t)
1990
8AO
..
ELECTRONICS.
NC
597--JS-2
www.SteamPoweredRadio.Com
•
•
•
WARNING
WARNING
ENSURE
NO
PRIMARY
POWER
IS
CONNECTED
TO
THE
MONITOR
BEFORE
PROCEEDING.
2-13.
INPUT
VOLTAGE
CHECK.
The
AS-10
is
programmed for
the
proper
power supplyvoltage
when shipped from
the
factory.
Ensure
the
powersupplyvoltage programming
is
correct
as
follows.
The
following
text
presents
the
AC
linevoltage programming:
LINE
VOLTAGE VOLTAGE
SELECTOR
PROGRAMMING
90-ll0V
108-133V
180-220V
205-242V
215-266V
100V
120V
200V•
220V
240V
*200Volt
Operation-
Disconnect
blue wire from
FLl-D.
Connect
Brn/wht
to FLT-D. Program
voltage selector for 200V
operation.
2-14.
Ensure
the
power supply voltage to
be
used
(100V, 115/l20V, 220V,
or
230/240V) is visible
from
the
ac Jine voltage selector device on
the
monitor
rear-panel
If
the
ac
line voltage
must
be
changed, proceed
as
follows:
A. Remove
the
acvoltage selectorcircuitboard with a small
pair
of
needle-nose p
lier
s.
Re-in
s
ert
the
circuitboard
so
that
the
correct
ac
line voltage
is
visiblefrom
the
ac
voltage selector device window.
2-15. Remove
the
fuse from
the
acvoltage selector device.
Ensure
the
fuse
and
the
spare fuse
are
slow-bl
ow
types
rated
at
l.0
amperes for
l00V
to 120Voperation
or
0.5 amperes for
220Vto 240V operation.
2-16.
PLACEMENT.
2-17.
The
AS-10 modulation monitorrequires5.25inches (13.3 cm)
of
a 19 inch (48.3 cm) cabi-
net
and
may
be
mounted
in
any
convenient location
within
reach
of
signal
and
power ca-
bles.
An
additional
l.75
inches(4.4 cm)
of
cabinetspace above
and
below
the
unit
is re-
quired to provide
adequate
cooling.
The
unit
should
not
be
mounted directly above
or
be-
low
heat-generating
equipment, otherwise no special requirements need
be
observed.
2-18.
WIRING.
2-19.
RF
WIRING.
Connect
the
RF
input
to
the
AS-10
RF
IN
receptacle (located on
the
rear-
panel).
Ensure
the
input
voltage
is
less
than
15V
RMS.
2-20.
GROUND
. A
terminal
is
provided
on
the
monitor
rear-panel
for a
ground
connection.
Connect
an
earth
ground to
the
terminal
as
required.
2-21.
REMOTE
INDICATIONS.
Remote
meter
indications
are
provided
on
the
REMOTE
1
and
REMOTE 2
rear-panel
connectors. Refer to Figure
2-2
and
constructremote interface
cables
as
required.
Mating
connectors for
the
cables
are
provided
in
the
AS-10
accessory
kit.
2-22.
AUDIO
OUTPUTS.
Balanced, 600 Ohm
left
and
right
channel audio
outputs
are
provided
on
the
AUDIO
OUT
rear-panel
connecto
r.
Refer to Figure
2-2
and
construct
an
audio
interface cable
as
required. A
mating
connectorfor
the
cable
is
provided
in
the
AS-10
ac-
cessorykit.
2-23.
INSTALLATION
ADJUSTMENTS.
2-24.
RF
ATTENUATOR
.
Installation
adjustments
involve
the
adjustment
of
the
AS-10
RF
att-
enuator
which determines
the
acceptable
carrier
input
level to
the
internal
AGC circuitry.
Once
the
RF
attenuator
is
correctlypositioned,
future
adjustment
will
not
be
required.
To
adjust
the
RF
attenuator,proceed
as
follows.
2-3
www.SteamPoweredRadio.Com
~
II"
~
REMOTE
1
Ila
a a a a
all
i 2 !
-1
! 8
REMOTE
2
Ila
a a a a
all
i 2 !
-1
! 8
AUDIO
OUT
Ila
a a a a
alj
1234!6
r
•
REMOTE
1
PIN
[il
•
~OTE
LEFT/L+R
MODULATION
METER
OUTPUT
[g]
.,
GAOUND
[i) •
REMOTE
RIGHT
/L-
R MOOUUTION
METER
OUTPUT
(II •
GAOUNO
~
.,
REMOTE
LEFT
/
L+R
ADJUSTABLE
PEAK
INDICATOR}
+12VOC
I
101lA
WHEN
(§]
•
REMOTE
RIGHT
/L-
R
ADJUSTABLE
PEAK
INDICATOR
ACTIVE
(LOGIC
1)
REMOTE
2
PIN
[j] •
REMOTE
+12!51
L+R
PEAK
INDICATOR}
+12VDC
I
1011A
WHEN
@ •
REMOTE
-1001
L+R
PEAK
INDICATOR
ACTIVE
(LOGIC
1)
Ii) •
GROUND
I
~ •
REMOTE
1001
L-R
PEAK
INOIC~TOR
} +
12
VDC
I 1
ou
WHEN
~
•
REMOTE
PILOT
INDICATOR
ACTIVE
(LOGIC
1)
[ij
.,
GAOUNO
AUDIO
OUT
PIN } ,
(i] • +
LEFT
C~
[i] . -
Ii) •
GR0IJNO
~
•
+}
RIGHT
CHANNEL
[i] . - .
[i] ..
GROIH)
FIGURE
2-2.
REMOTE INDIC. R AND AUDIO
wm.ING
AUDIO
OUTPUT
IMPEDANCE:
800
OHMS
~@
1990
BROAOCASTEUClRONIC
S,
INC
· 597-0105-4 •
www.SteamPoweredRadio.Com
•
•
••
2-25
.
2-26.
Applypowerto
the
AS-10
by
connecting
the
accord
to
an
appropriatepowersource.
Apply
the
normal operatingRF signal to
the
AS-10.
2-27
. Refer
to
Figure
2-3
and
observethe RF ATTENUATOR
and
the
RF
mGB
and
RF
LOW
indicators. With the RFATTENUATOR
at
the
O
dBposition, adjust the control clockwise
to
the
-6
dB position. Waitapproximately
30
seconds
to
allow
the
internal
AGC
circuitry
to
track
the
new
input
level
and
observe
the
RF
mGB
and
RF
LOW
indicators. Continue
slowly adjusting
the
att
e
nuator
as
directedby
the
indicators
until
both
the
RF
mGB
and
RF
LOW
indicators
are
extinguished.
2-28
. Afteradjustingthe
RF
ATTENUATOR,
ensure
the
front-panel
RF
indicatoron
the
RF/Pl•
LOT
switch/indicator
is
illµmin
ate
d
and
observe
the
RF/PILOT
LEVEL
display(refer
to
Figure
2-3).
Bothindic
ators
in
the
NOM display
must
be
illuminated.
If
onlyoneindica-
tor
is illuminated, adjust
th
e RFATTENUATOR oneposition clockwise
or
counterclockwise
as
required until:
1)
both
RF
LEVEL NOM
indicatorsilluminate
and
2)both
the
RF
IDGH
and
RF
LOW
indicato
rs
extinguish.
-12d8 -18d8
-6dl
-2
4d8
Od
B
~-30d8
Rf
A
TTDIUA
TOA
Rf Ill
15
Y
RMS
IIAl
~
~
Rf
FUS[
Rf
HIGlt
Q
RF
ATTDIUATOR
RF
HIGH
INDICATOR
:
INOtCAns A
HIGH
RF
INPUT
CONOJTl
IIIOI
ILLllllMATED
AUTORAIIGE
~w
0
I
~
RF
LCYD.
N<JI
I
IIOICATORS
BOTlt
RF
LCY£L
N<JI
lNOlCATOltS
ILLllllMil
TO
lllO
ICA
n A
COllt£CT
RF
lllPUT
LCY£L.
AUTORAll6E
LEYD.
RFn
O
rlLOT
MF~O
I
~
1""'1
l
·r
r
RF
LEYEl.
N<JI
INDICATORS
~
C'J
1990
~
B.EC'IRONICS.
INC
597-0105-5
FIGURE
2-3.
RF
ATI'ENUATORAND INDICATORS
2-5
www.SteamPoweredRadio.Com
•
•
•
3-1.
3-2.
3-3.
3-4.
INDEX
NO.
1
2
3
4
5
INTRODUCTION.
SECTION
Ill
OPERATION
This
sectionidentifies all controls
and
indicatorsassociated
with
the
AS-10
AM
stereo
modulation monitor
and
provides
standard
operatingprocedures.
CONTROLS
AND
INDICATORS.
Referto Figure
3-1
for
the
location
of
allcontrols
and
indicators associated
AS-10
AM ste-
reomodulation monitor.
The
function ofeach control orindicator
is
described
by
Table
3-L
.
TABLE
3-1.
CONTROLS
AND
INDICATORS
(Sheet
1
of
5)
NOMENCLATURE FUNCTION
LEFT, RIGHT, L+R, Decoded audio samplesfor external
test
equipment.
L-R
,
and
PIWT
Connections
+125%
L+
R
Peak
Indicates+125% L+R
peak
modulation when illuminated.
Indicator
The
indicator
is
independent
of
the
INPUTI.JL+Rswitch/
indicator
and
continuouslymonitorspositive peak L+R
modulation.
-100% L+R
Peak
Indicates-100% L+R peak modulation
when
illuminated.
Indicator
The
indicator
is
independent
of
the
INPUT
I.JL+Rswitch/
indicator
and
continuouslymonitorsnegativepeak L+R
modulation.
LEFT/L+RChannel Indicators whichilluminate toindicate
the
various
Modulation Meter LEFT/L+R channelmodulation
meter
ranges.
RANGE Indicators
LEFT/L+R Channel SWITCH: Selects
manual
or
autorange
operation of
the
Modulation Meter LEFT/L+Rchannelmodulation meter. Autorange
AUTORANGE operation
is
selectedonly when simultaneouslyoperated
Switch/Indic.
ator
with
the
RIGHT/L-RchannelAUTORANGEswitch/
indicator.
ON INDICATOR: Indicates
autorange
operation
of
the
LEFT/L+Rchannelmodulation
meter
when
illuminated.
OFF
INDICATOR: Indicates
manual
operation
of
the
LEFT/L+Rchannelmodulation
meter
whenilluminated.
3-1
B§•
~INC
www.SteamPoweredRadio.Com
INDEX
NO.
6
7
8
9
10
11
TABLE
3-1.
CONTROLS
AND
INDICATORS
(Sheet
2
of
5)
NOMENCLATURE FUNCTION
RF/PILOTLEVEL SWITCH: Selects
RF
or
pilot
level
parameters
to
be
Switch/Indicator
presented
on
the
LEVELdisplay.
PILOTLEVELINDICATOR: Indicates
the
pilotlevel
parameter
is
.selected for display
when
illuminated.
RF
LEVELINDICATOR:
Indicates
the
RF
level
parameter
is
selectedfor display
when
illuminated.
LEVELDisplay Displays
the
RF
LEVEL
or
PILOTLEVEL
parameters
as
selected
by
the
RF/PILOTLEVELswitch/indicator.
RF
LEVELDISPLAY:
Scale:
-5%
to
+5%
Operation: Two NOMindicatorsilluminate
to
indicate a correct
RF
input
level.
Carrier
shift
~s
displayed byindividual indicatorswhich illuminate
at
1%incrementsbetween
-5%
and
+5%.
PILOTLEVEL DISPLAY:
·Scale: 0%
to
10%
Operation: Two NOMindicatorsilluminate
to
indicate 5% pilotir\jection. Additional pilot level
parameters
are
displayed
by
individual indicators
which
illuminate
at
1% incrementsbetween0%
and
10%.
RIGHT/L-R
Channel
SWITCH:.Selects
manual
or
autorange operation
of
the
Modulation
Meter
RIGHT/L-Rchannel
modulation meter. Autorange
AUTORANGE operation
is
selected only
when
simultaneouslyoperated
Switch/Indicator
with
the
LEFI'/L+R
channel
AUTORANGE switch/
indicator.
ON INDICATOR: Indicates
autorange
operation
of
the
RIGHT/L-Rchannel modulation
meter
when illuminated.
OFF
INDICATOR:
Indicates
manual
operation
of
the
RIGHT/L-Rchannelmodulation
meter
when
illuminated.
RIGHT/L-RChannel
Indicatorswhich
illuminate
to
indicate
the
various
Modulation
Meter
RIGHT/L-R channel modulation
meter
ranges.
RANGE Indicators
L-R
100%
Peak
Indicates 100%
L-R
peak
modulation
when
illuminated.
Indicator 'The indicator
is
independent
of
the
INPtrr
R/L-R
switch/
indicator
and
continuouslymonitors
L-R
modulation.
PILOT
Indicator
illuminates
to
indicate
the
detection
of
a 25
Hz
pilot
tone
.
B§~INC
3-2
•
•
•
www.SteamPoweredRadio.Com
•
•
•
INDEX
NO.
12
13
14
15
16
17
TABLE
S-1.
CONTROLS
AND
INDICATORS
(Sheet
S
of
5)
NOMENCLATURE
RIGHT/L-R
Channel
Adjustable
Peak
Modulation
Indicator
RIGBT/L-R
Channel
Adjustable Peak
Modulation
IndicatorControl
RIGBT/L-R
Channel
TestReceptacle
RIGHT/L-R
Chann
el
Modulation Meter
~RINPUT
Switch/Indicator
RIGBT/L-R
-/+
POLARITY
Switch/
Indicator
FUNCTION
Illuminates toindicate
the
right/L-R
channelmodulation
as
selected
by
the
right/L-R
channel adjustable
peak
modulationindicator
control
Selects
the
right/L-R
channelmodulation percentage
displayed on
the
right/L-R
channel adjustablepeak
modulationindicator.
Decoded right/L-Rchannel audio
samples
for external
te
st equipment.
Displays
right
channel
or
L-R
channelmodulation levels.
The modulation
parameters
are
displayed
by
semi- pe
ak
and
average
meter
baJlistics.
METERRANGE
0dB
-l0dB
-
20dB
-30dB
-40dB
--50
dB
METERBALLISTICS
Semi-Peak
Av
erage
SWITCH: Selects
right
channel
or
L-R
channel
information to
be
presented on
the
right/L-R
channel
modulation
meter
, acljustable peak modulation indicator,
and
front-panel
test
receptacle.
L-R
INDICATOR: Indicates
L-R
modulation information
is
presentedon
the
right/L-R
channel modulationmeter,
adjustable
peak
modulationindicator,
and
front-panel
test
receptacle when i11uminated.
R INDICATOR: Indicates
right
channelmodulation
infor-
mation
is
presented on
the
right/L-R
channelmodulation
meter,adjustable
peak
modulationindicator,
and
front-
panel
test
receptacle
when
illuminated.
SWITCH: Selects positive
or
negative
peak
right/L-R
channel information to
be
displayed
by
the right/L-R
channel modulation meterandadjustable
peak
modulation
indicator.
3-3
Table of contents
