Delta Electronics C-QUAM ASE-1 User manual
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C-QJAM~
S1'ERID
SYSfEM
INSfALI.ATICN
(Preliminary
Manual)
EXCITER
t-ODEL
ASE-1
t-aXJI.ATICN
M'.:Nl'roR
t-ODEL
ASM-1
FCC
I.
D.
Il<767Cl300
DELTA
ELF.Cl'RCNICS,
INC.
5730
GENERAL
WASHING'IW
DRIVE
ALEXANDRIA,
VIR:iINIA 22312
®c--OUAM
is
a
registered
trademark
of
r-t>torola,
Inc.
Delta
C--OUAM
system
equipment
is
manufactured
under
liscense
fran
Motorola,
Inc.
ISSUE
Ol\TE:
15
MAY
1984
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CERTIFICATE
OF
WARRANT'{
Delta
warrants
to
Purchaser
that
the
product
it
delivers
will
be
free
of
defects
in
materials
and be
of
good
quality
and workmanship.
This
warranty
applies
to
the
period
of
one
year
from
the
date
of
delivery
except
for
com{X)nent
parts
purchased
from
other
sources
and
assembled
in
Delta's
production.
Such component
parts
bear
only
the
warranty
of
the
manufacturer
thereof
in
effect
at
the
time
of
shipnent
to
Purchaser.
Delta
will,
at
its
own
expense and,
after
written
notice
has been
received
and acknowledged
by
Delta,
repair
or
replace
any
product
which
proves
to
be
defective
{according
to
the
usage
of
the
trade)
during
the
above
designated
warranty
periods
when
such product
is
received
by
Delta
at
its
Alexandria
address
with
shipnent
costs
prepaid by
Purchaser.
Delta
will
not
be
liable
for
consequential
damages.
No
other
warranty
is
expressed
or
implied.
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GENERAL
INFORMATIOO
SAFET'i
PRECAUTlrns
.
This
Manual
is
intended
for
use by
trained
and
qualified
operating
or
service
personnel
who
are
familiar
with
the
dangers
inherent
in
handling
potentially
hazardous
electrical
and/or
electronic
circuits.
It
is
not
intended
to
contain
a complete
statement
of
all
safety
precautions
which
should
be
observed
by
personnel
using
this
or
other
electronic
equipnent.
Avoid
risking
electrical
shock
in
handling
all
circuits
where
substantial
currents
or
voltages
may
be
present.
The
procedures
outlined
in
this
Manual
are
based on
the
information
available
at
the
time
of
publication.
However,
the
manufacturer
cannot
assume
liability
with
respect
to
technical
application
of
the
contents
and
shall,
under
no
circunstances,
be
responsible
for
damage
or
injury
(whether
to
person
or
property)
resulting
from
its
use.
REPLACEMENT
PARTS
To
obtain
service
replacement
or
warranty
items,
write
or
call
Delta.
Please
supply
Product
Identification
(Model Number
and
Serial
Nunber) and Replacement
Part
Identification
(including
Stock
Number
and
Description).
Shipping
of
replacements
may
be
unduly
delayed
if
the
necessary
information
is
not
supplied
. A
complete
List
of
Materials
is
provided
in
this
Manual.
EQUIPMENT
01\MAGED
IN
TRANSIT
This
item
should
be
unpacked
and
inspected
for
damage
WITHIN
15
DAYS
after
receipt.
If
concealed
damc:19e
is
discovered,
imnediately
notify
the
carrier,
confirming
the
notification
in
writing,
and
secure
an
inspection
report.
Report
all
shortages
and
damages
to
Delta
at
the
location
shown below.
Delta
will
file
all
claims
for
loss
and
damage
on
this
equipnent
so
long
as
the
inspection
report
is
obtained.
Disposition
of
the
damaged
items
will
be
furnished
by
Delta.
FIELD
ENGINEERING
SERVICE
Requests
for
installation,
field
engineering
or
service
assistance
should
be
directed
to
Delta.
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TABLE
OF
CXNrENTS
SECTION
TITLE
PAGE
I
FOREWORD
-
What
Is
C-QUAM?
I 1
INTRODUCTION
1-1
1.1
Scope
1-1
1.2
System
Specifications
1-2
I
1.3
ASE-1
Stereo
Exciter
Description
1-3
1.4
ASM-1
Modulation Monitor
Description
1-8
I 2
EQUIPMENT
CHECKoor
AND
INITIAL
TESTS
2-1
2.1
Chassis
Inspection
2-1
2.2
Mechanical Checkout 2-1
2.3 Required
Test
Equipnent 2-3
I
2.4
Closed
Loop
Tests
2-4
3
MOOITOR
MEASUREMENTS
OF
BROADCAST
TRANSMITI'ER
3-1
I
3.1
Introduction
3-1
3. 2
Procedures
3-1
I 4
ASE-1
RF
CONNECTIONS
TO
BROADCAST
TRANSMITI'ER
4-1
4.1
Introduction
4-1
4.2
Discussion
4-1
I. 5
ASE-1
AUDIO
CONNECTIONS
TO
5-1
BROl\DCAST
TRANSMITI'ER
5.1
Introduction
5-1
I
5.2
Phasing
ASE-1
Output
to
the
Transmitter
5-1
5. 3
Adjusting
the
Delay Networks 5-2
5.4
Equalization
Adjustments
5-4
I
5.5
Separation
Checks
5-5
5.6
Operation
into
the
Antenna
5-6
6
ASE-1/ASM-l
SfEREO
·
S'x'STEM
6-1
I
EQUIPMENT
PERFORW\NCE
MEASUREMENTS
6.1
Introduction
6-1
6.2
Procedure 6-1
I 7
LIST
OF
MATERIALS
7-
I 8
ILLUSTRATIOOS
AND
SCHEMATIC
DIAGRAMS
8-1
APPENDIX
A
FCC
SECTION(S)
74.40
AND
73.128(?) A-
I
APPENDIX
B
ASE-l/ASM-1
EQUIPMENT
PERFORMANCE
MEASUREMENr
SAMPLE
FORM.$
B-1
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LIST
OF
FIGURES
SECTION
TITLE
PAGE
I
FOREWOOD
AAPLI'NDE
MOOUI.ATIOO
F-2
PHASE
MODUI.ATIOO
F-4
C-QUAM
BLOCK
DIAGRAM
F-6
I 1
EXCITER
FROOT
VIEW
1-3A
EXCITER
REAR
VIEW
l-5A
I
EXCITER
CIRCUIT
CARO
LOCATION
1-58
EXCITER
CIRCUIT
CARD
l-7A
EOOE
CONNECTOR
PIN
IDENTIFICATIOO
I
MOUTOR
FRONT
PANEL
l-8A
~ITOR
REAR
PANEL
l-9A
MOJITOR
CIRCUIT
CARD
LOCATIOO
1-lOA
~ITOR
CIRCUIT
CARO
l-12A
I
ED:,E
CONNECTOR
PIN
IDENTIFICATION
2
IDEAL
OSCILLOSCOPE
DISPLAY
OF
2-3A
I
srEREO
SIGNALS
(5)
SAMPLE
OSCILLOSCOPE
DISPLAYS
OF
2-38
srEREO
SIGNALS
(6,7)
I
CLOSED
LOOP
F.QUIPMENT
ARRAN:iEMENT
(1) 2-4A
MATCHIN:i
PAD
CONsrRUCTION
(2) 2-5A
L+R
(AM)
0PERATICN- 2-6A
OSCILLOSCOPE/SPECTRUM
ANALYZER
DISPLAYS
I L-R
INTO
L+R
(AM)
OPERATION-
2-9A
MINIMUM
PERFORMANCE
(8)
I 3 L-R
SIMULATED
OSCILLOSCOPE
X-Y
DISPLAY
(7) 3-2A
L+R
INTO
L-R
OPERATION-
3-3A
MINIMUM
PERFORMANCE
(8)
I
ASE-1
CONNECTING
CIRCUITRY- 4-2A
TRANSISTOR
(9)
ASE-1
CONNECTING
CIRCUITRY- 4-3A
I
TUBE
RF
(10)
5
PHASIN:i
OF
BROAOCAST
TRANSMITl'ER
5-lA
AUDIO
INPUT
(11)
I 6
BLOCK
DIAGRAM
OF
TEsr
ARRANGEMENT
6-2A
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SECTION
I 8
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LIST
OF
FIGURES
COITINUED
TITLE
BLOCK
DIAGRAM
(EXCITER)
AUDIO
EQUALIZER
MATRIX
([Y\'i)
ENCODER
L+R
AMPLIFIER/SAMPLE
TRANSMITTER
RF
AMPLIFIER
PCMER
SUPPLY
AUDIO
NIGtrr
PROCESSOR
AUDIO
INTERFACE
BULK
DELAY
FUNCTI~AL
DIAGRAM
(1'0NITOR)
MIXER
DECODER
AVC
METER
POWER
SUPPLY
PAGE
DlS-10
D33-320
033-319
033-321
033-322
D33-323
D33-334
D33-336
D33-335
DlS-12
D33-312
033-328
D33-329
D33-330
iii
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FO~RD
I.
WHAT
IS
C-QUAM?
C-QUAM
is
the
Compatible Quadrature Amplitude
~dulation
method
of
stereo
transmission
by which a main
(L+R)
and a subchannel (L-R)
signal
are
transmitted
on
a
single
carrier.
This
is
accomplished
by
using
two
modulation modes
to
transmit
the
main
and
stereo
information
channels.
Stereo
receivers
separate
the
signals
to
ultimately
produce
left
and
right
channel
audio
while
typical
monophonic
receivers
detect
only
the
L+R
(mono)
content
of
the
C-QJAM
signal.
'111e
irost
imp:>rtant
feature
of
C-QUAM
is
that
no
compromises
are
made
in
the
monophonic performance
in
order
to
transmit
stereo.
It
is
truly
a
compatible
stereo
transmission
system.
II.
AM
ANO
PM
1'l)()(JLATICN
To
ensure
a
full
understanding
of
C-QUAM
a
quick
presentation
of
modulation
characteristics
is
in
order.
Amplitude modulation
is
the
process
in
which one
signal's
amplitude
is
varied
by
another
signal.
An
oscilloscope
display
depicts
the
amplitude
variation
versus
time
of
the
AM
signal.
'111is
is
the
familiar
RF
envelope
display
illustrated
in
Figure
lA.
'111e
AM
signal
can
also
be
described
in
the
frequency
domain
with
an
amplitude
versus
frequency
plot.
Figure
18
illustrates
a
typical
spectrum
analyzer
display
of
an
AM
signal.
The
display
reveals
a
carrier
and two sidebands
separated
from
the
carrier
by
the
modulating
frequency.
In
AM,
as
the
modulation
is
increased,
the
sideband
amplitudes
increase
but
the
average
carrier
level remains
constant.
F-1
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Phase
modulation
results
in
very
different
time
and
frequency
domain
plots.
PM
is
generated
by
varying
the
phase
of
the
carrier·
signal,
and
thus,
its
frequency,
while
the
amplitude remains
constant.
Figure
2A
illustrates
a
PM
signal
RF
envelope.
The
spectrum
analyzer
plot
of
a
PM
signal
reveals
sidebands
spaced
at
multiples
of
the
modulation frequency
from
the
carrier.
Since
the
amplitude
of
the
PM
signal
is
constant,
the
phasing
of
the
sidebands
is
such
that
they
add and
subtract
to
produce a
constant
amplitude.
Figure
2B
illustrates
the
PM
signal
spectrum
plot.
Since
the
phase
of
the
carrier
is
not
affected
by
amplitude
variations,
a phase
detector
output
is
zero
when
an
AM
signal
is
input.
Simila~ly,
an
envelope
detector
does
not
detect
{ilase
variations
of
the
PM
signal
.
All
the
sidebands
add and
subtract
according
to
their
phasing
to
produce a
constant
amplitude
RF
signal.
Thus, a {ilase modulated
carrier
can
also
be
amplitude
modulated producing a
signal
that
carries
two
channels
of
information
easily
separated
at
the
receiver.
Most
important
is
the
fact
that
neither
modulation
mode
affects
the
output
of
the
other
mode
detector.
This
.
effect
allows
C~AM
to
be
perfectly
compatible
with
all
AM
receivers.
C~AM
transmits
the
L+R
(mono
)
information
with
AM
while
the
L-R
(stereo)
information
is
contained
on
the
PM
signal
. The
millions
of
existing
envelope
detector
type
radios
now
in
use
detect
only
the
L+R
AM
signal,
thus
producing
a
clear
undistorted
mono
audio
signal
that
is
completely
unaffected
by
the
L-R
stereo
subchannel
information
sent
on
the
same
carrier.
Stereo
decoders
detect
the
L+R
and
L-R
separately
and dematrix
them
to
produce
left
and
right
stereo
audio.
F-3
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III.
GENERATit,l;
C-QUAM
The
AM/PM
method
of
stereo
transmis
sion
discus
sed can be ·
achi
eved
by
several
methodologies.
C-QUAM
us
es
the
L+R
information
to
pr
o
duce
an
in
phase,
I,
AM
signal
while
the
L-R
information
is
used
to
gen
e
rate
a
quadrature
(90°
phase
shifted),
Q,
A.~
signal.
Surming
the
I and Q
signals
results
in
a
signal
that
is
both amplitude
modulated
and
phase
modulated.
This
quadrature
amplitude
modulated
(QUAM)
signal
is
not
compatible with
envelope
detector
receivers
because
the
Q
channel
amplitude
affects
the
amplitude
of
the
sum
of
the
I and Q
channels.
The
QUAM
signal
is
thus
passed through a
limiter
to
strip
off
the
amplitude
variations
leaving
only
a
phase
modulated
carrier.
This
phase
modulated
carrier
ge
nerated
from
quadrature
amplitude modulation
replaces
the
carrier
normally
generated
by
the
crystal
oscillator
in
the
broadcast
transmitter.
'11le
I information
(L+R)
can
then
be
used
to
amplitude modulate
the
phase modulated
carrier
in
the
broadcast
transmitter
as
is
done
in
conventional
AM.
'Ibe
output
of
the
transmitter
is
thus
the
C-QUAM
signal.
Figure
3
illustrates
the
C-QUAM
transmission
methodology.
' F-5
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CARRIER 90• PHASE
OSCILLATOR SHIFTER QUAM
SUMMATION TRANSMITTER
RF INPUT
(L
+
A)Q(L-
A)
---
----------=----=-.,_
____
....,
___________
..,
___
_
L-RAUDIO
MATRIX
I
ASM-1
MODULATION
MONITOR
FIGURE
3
C-QUAM
BLOCK
DIAGRAM
I F-6
DELTA
TCTOR
MOOlJ.
LATI
ON
MONITOR
PORT
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1.1
SCOPE
SECTION
1
INTROOUCTIW
This
manual
describes
the
installation,
adjustment
and maintenance
of
the
C-QUAM
Stereo
System
ASE-1/ASM-l
manufactured
by
Delta
Electronics,
Inc.
The
information
in
this
manual
is
intended
for
use
only
by
Delta
trained
or
approved
Installation
Team
personnel.
Section
2
deals
with
checkout
of
newly
delivered
C-QUAM
Stereo
equipnent.
Section
3
instructs
measurement
of
broadcast
transmitter
performance
with
the
ASM-1.
Section
4
discusses
the
ASE-1/transmitter
RF
interface.
Section
5
describes
the
required
audio
connections
and
adjustments
for
phasing
and
equalization.
In
Section
6,
procedures
are
given
for
the
first
Proof
of
Performance
measurement
process
involving
the
new
equipment.
Sections
7
and
8
are
Equipment
and
Assembly
level
Lists
of
Material,
and
Assembly Schematic
Diagrams,
respectively.
As
noted
in
the
accompanying Customer
Information,
Del
ta
warrants
its
C-QUAM
Stereo
products
as
to
material
integrity,
unit
quality
and
workmanship,
excluding
comfOnent
parts
purchased from
other
sources.
Also,
this
Manual
is
intended
for
use
only
by
personnel
familiar
with
potentially
hazardous
electrical/electronic
circuitry.
It
does
not
contain
a complete
statement
of
safety
precautions.
The
information
presented
is
accurate
up
to
Issue
Date.,
but
Delta
cannot
assume
liability
for
technical
application
of
that
information,
nor
for
damage
or
injury
resulting
from
use
of
the
subject
C-QJAM
Stereo
equipnent.
/- /
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1.2
SYSTEM
S
PECIFICATIOOS
1.2.1
System Closed
Loop
Performance
The
following
measurements
repre
s
ent
typical
closed
loop
perfonn
a
nce
of
the
Exciter
operating
into
the
Monitor.
Stereo
Separation:
35
dB
minimlJ'I\,
100
Hz
to
S
kHz
Frequency Response:
L,R
50
Hz
to
15
kHz+/-
1.0
dB
Harm
o
nic
Distortion:
L = R monaural 0.
25%
max.,
at
85%
mod.
L =
-R
pure
stereo
0.5% max,
at
85%
mod
.
L,
R
single
channel 1.
0%
max.,
at
70%
mod.*
*NCYrE:
'Ibis
is
equivalent
of
140%
modulation
70%
envelope modulation,
simultaneous
with
70%
stereo
infor-
mation.
1.2
. 2
ASE-l/ASM-1
Unit
Specifications
EXCITER
MOOITOR
Audio
Input:
Right
and
Left
0-10
dBm
Adjustable,
600
ohms
balanced
Meter Range:
-20
to
3
dB
O
dB=
100%
modulation
RF
OUtput:
Adjustable,
to
3W
(Carrier
frequency)
into
50
ohms
Audio
to
Transmitter
(L+R)r:
Adjustable,
to
16 dan
RF.
Input:
1-10
volts
RMS,
impedance
50
ohms
Frequency
crystal
controlled
Modulation
Meters'
Range:
0-140%
,
-20
to
3
dB
Adjustable
,
Oto
-50
dB
in
-10
dB
steps
Accuracy:
,±_2%,
at
100%
mod.,400
Hz
.
,.,
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1.2.3
ASE-1/ASM-l
Controls
and
Indicators
EXCITER
Meter
Functions:
(L+R)Q
and
(L-R)Q
or
LEFT
and
RIGHT
selected
by
front
panel
switch
Also (L+R)I
using
(L+R)
ENV
switch
under
front
panel
cover
Mode
Switches:
srEREO/MOOAURAL
switch
under
front
panel
cover
NIGHT,IIY,.Y
switch
under
front
panel
cover
Pilot
Tone
switch:
00/0FF
switch
under
front
panel
cover
LED
Indicators:
srEREO,
NIGHT,
PILOI'
Phase
Equalization:
Adjustable
internally
Exciter
outputs:
BNC
connectors,
rear
panel
High Level
carrier
frequency,
phase roodulated
TTL
Level
carrier
frequency,
phase roodulated
Unmodulated
carrier
frequency
sync
output
Sample
Transmitter
C-QUAM
output,
2
volts
peak-to-peak
into
50
ohms
for
closed
loop
tests.
Barrier
Strip,
rear
panel
L+R
audio
output
Modulation
Meters'
Functions:
(+)
or
(-)
Land
L+R,
or
Rand
L-R
Front
panel
switch
Peak Modulation
Indicators:
(L+R)
Group:
-100%
indicator
internally
set
to
flash
when
modulation exceeds
-99\
+125%
indicator
internally
set
to
flash
when
modulation exceeds +124\
Peak
Indicator
adjustable
via
wheel
switches
from
30%
to
150%.
Modulation
selectable
via
push-
button
switches
+
or
-
(L-R)
Group:
Negative
limit
set
internally
to
flash
at
1.46
radians
or
83.670
(L-R)
limit
set
internally
to
flash
when
roodulation exceeds
99\
Peak
flasher
adjustable
via
thl.lllb-
wheel
switches
for
30\
to
125\
Monitor
OJtputs:
BNC
connectors,rear
panel
Remote
Flashers
(L+R), (L-R)
Remote
Meters (L+R),
(L-R)
Right
and
Left
Audio
600
otms,
balanced
and unbalanced
(L+R), (L-R) and
25
Hz
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ER
FRONT
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R782 R78l :R784 R783
·
5802 5803
5804
S805
M802
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1.3
1.
3.1
REF
M801
M802
DS801
DS802
S801
DS803
R782
R781
R784
S803
S802
S805
S804
R783
ASE-1
STEREO
EXCITER
DESCRIPTION
Exciter
Front
Panel
DESCRIPTION
FUNCTION
Meters Audio
level
meters
for
test/set
up
Note:
the
meters
are
not
to
be
used
as
an
indication
of
modulation
Pilot
Indicator
LED
On/Off
indication
of
pilot
output
Stereo
Indicator
LED
On/Off
indication
of
stereo
operating
mode
Function
switch
Top -
(L+R
1)
set
up
position
indicating
the
relative
level
of
left
and
right
channel
audio
drive.
Night
Indicator
LED
+
Limit
-
Limit
L+R
Mj
Mono/Stereo
switch
Stereo
Pilot
switch
L+R
Envelope
switch
Night/Day
switch
Balance
Bottom -
(L+RQ)
indicates
L+R
and
L-R
audio
drive
levels
On/Off
indication
of
night
operating
mode
* Audio
drive
level
limiting
adjustment
* Audio
drive
level
limiting
adjustment
Sets
output
levels
of
L+R
signal
fed
to
modulation
input
of
station
transmitter
Selects
between mono
and
stereo
mode
On-Off
pilot
switch
Momentary
action
pushbutton
switch
to
test
if
drive
to
the
L+Rr
envelope
is
present
Changes
equalization
for
use
with
another
transmitter
or
antenna.
Works
in
parallel
with
remote
switch
on
back.
Optional
control
used
only
if
Exciter
is
equipped
with
the
night
equalization
feature.
Allows
slight
amplitude
adjustment
between
left
and
right
inputs
* Misadjustment
will
redu
ce
stereo
separatio
n
, I I
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1.3.2
REF
J2
J3
Jl
TBl
1,
2
TB2
TBl
3-6
J4
1.3.3
Exciter
Rear
Panel
DESCRIPTICN
Sync Out
Exciter
output
Sample
Transmitter
output
Remote
Night/Day
switch
Audio
Input
L+R
output
Tl'L
output
F\.NCTICN
Sync
from
encoder
to
evaluate
amount
of
.
phase
modulation
of
master
carrier
frequency
Square
wave
output
to
AM
transmitter
for
high
power
drive
(0.5
to
5.0
watts
in
steps).
This
signal
is
the
phase
modulated
substitute
for
the
transmitters'
oscillator.
C-QUAM
output
for
test
of
Exciter
to
monitor
Works
in
parallel
with
front
panel
·
switch
for
changing
equalization
when
using
another
transmitter
or
antenna.
(See
Exciter
front
panel
controls.)
Left
and
Right
600
ohm
balanced
audio
input
O
dBm
to
10
dBm
(determined
at
time
of
installation).
Balanced
output
from
L+R
crnplifier
to
station
transmitter
(rormal
AM
modulation
input).
Adjusted
by
L+R
Adj.
front
panel
control,
+16
dBm
maximlltl.
Phase
modulated
signal
which
is
acceptable
for
TTL
compatible
transmitters.
Substitutes
'
for
normal
oscillator
of
station
transmitter.
Exciter
Circuit
Cards
-
Basic
Functions
Power Supply
The Power
Supply
operates
from
a 117V
AC,
60
Hz
source
and
is
protected
with
a
1.5
amp
fuse.
It
provides
(+5),
(-15)
and
(+15)
volt
DC
regulated
outputs
and
-24V
DC
unregulated
for
the
meter lamp; and
front
panel
LEDs.
\
t-5
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