Amplifier Research 10W1000 Service manual
TEL
215-723-8181
TWX
510-661-6094
FAX
215-723-5868
SECTION
I
GENERAL
INFORMATION
1»
1
GENERAL
DESCRIPTION
The
Model
10W1000
Amplifier
is
a
self-contained
broadband
unit
designed
-for
laboratory
applications
where
instantaneous
band¬
width,
high
gain,
and
moderate
power
output
are
required.
Solid
state
technology
is
used
exclusively
to
ofter
significant
advantages
in
reliability
and
cost.
A
Model
10W1000
used
with
a
frequency
swept
signal
source
will
provide
10
watts
of
liner-
swept
power
output
from
1-1000
MHz.
Typical
applications
include
antenna
and
component
testing,
wattmeter
calibration,
EMI
Susceptibility
Testing,
use
as
a
Driver
for
Frequency
Multipliers
and
High
Power-
Amplifiers,
and
as
an
RF
source
for
Magnetic
Resonance
Imaging
studies.
1.2
POWER
SUPPLIES
This
unit
has
a
self-contained
120/240
VAC,
50/60
Hz,
regulated
power
supply.
The
power
consumption
is
a
nominal
500
watts.
Primary
circuit
fusing
is
provided.
1
.
3
SPEC
IFI
CAT
I
QMS
Refer
to
Amplifier
Research
Data
Sheet
on
next
page
for
detailed
specifications.
1.4
PERFORMANCE
VERIFICATION
Refer
to
Amplifier
Research
Drawing
No.1001661
titled
“Flatness
Test
Model
lOWlOOO"
,
located
after-
speci
f
i
cat
i
ons.
1-1
REV-
RECOMMENDED
TEST
EQUIPMENT
S.G.
—
Sweep
Generator
Texscan
Model
VS60B
or
equal.
Display
=
Texscan
Model
DU120
or
equal.
EA30
=
Fixed
attenuator
30
+0.75
dB,
20w,
Narda
Model
776—30
or
equal.
(2)FA3-1,2
=
Fixed
attenuator
3dB
Texscan
Model
FP-50
or
equal.
Det.
=
Detector
1-1000
MHz
Texscan
Model
CD-50
or
equal.
WM
=
Wattmeter
Bird
Model
43
w/10
watt
plug,
Model
10E.
The
amplifier
flatness
shall
be
measured
at
approximately
watts
output.
Calibrate
the
test
set-up
as
follows:
1.
Adjust
S.G.
to
produce
1—1000
MHz
3
OdBm
by
connecting
the
RF
output
to
the
detector
input.
Include
cables,
adapters,
etc.
that
will
be
used
to
test
the
amplifier
so
all
sources
of
error
are
included.
Mark
a
line
over
the
trace
on
the
display
-
this
is
the
OdBm
reference.
2.
Add
FA3—1
between
the
S.G.
RF
output
and
the
Detector
input.
Mark
a
line.over
this
trace
to
establish
-3dBm
reference.
3.
Connect
the.RF
output
of
S.G.
to
the
input
of
the
10W1000.
Connect
FA3-1
to
FA3-2
and
turn
the
amplifier-
on.
Adjust
the
RF
output
level
of
S.G.
for
average
response
between
the
two
lines
on
the
display
that
were
marked
previously.
4.
Observe
response
to
determine
flatness
tolerance
of
+1.5
dB.
160
SCHOOL
HOUSE
ROAD
SOUDERTON,
PA.
18964
-
9990
USA
PHONE
215-723-8181
•
TWX
510-661
-6094
1001661
REV0582
SECTION
II
OPERATING
INSTRUCTIONS
2*1
GENERAL
Operation
of
the
Model
lOWiOOO
broadband
amplifier
is
quite
simple*
The
input
signal*
whether
swept
or
fixed
in
frequency*
is
fed
into
the
jack
marked
INPUT
and
the
amplifier
output
signal
is
taken
from
the
jack
labeled
OUTPUT*
The
unit
is
turned
ON
by
activating
the
power
switch*
In
the
event
of
a
unit
malfunction*
protection
is
provided
by
fusing
located
at
the
rear
of
the
unit*
A
polarized*
three
(3)
wire
AC
power
cord
is
also
included
with
the
unit
to
provide
cabinet,
and
chassis-
grounding
to
the
power
mains*
IAUTION:
THE
MODEL
10W100G
AMPLIFIER
IS
NOT
CRITICAL
IN
REGARDS
TO
SOURCE
AND
LOAD
V5WR
AND
WILL
REMAIN
UNCONDITIONALLY
STABLE
WITH
ANY
MAGNITUDE
AND
PHASE
OF
SOURCE
AND
LOAD
VSWR.
IT
ALSO
HAS
BEEN
DESIGNED
TO
WITHSTAND
*
WITHOUT
DAMAGE
*
RF
INPUT
POWER
UP
TO
TWENTY
<20>
TIMES
ITS
RATED
INPUT
OF
ImWs
HOWEVER
*
SIGNAL.
LEVELS
HIGHER
THAN
20
mW
DR
TRANSIENTS
WITH
HIGH
PEAK
VOLTAGES
CAN
DAMAGE
THE
AMPLIFIER*
ALSO
*
ACCIDENTAL
CONNECTION
OF
THE
10W1000
OUTPUT
TO
THE
INPUT
CAUSES
OSCILLATIONS
WHICH
WILL
PERMANENTLY
DAMAGE
THE
INPUT
TRANSISTOR.
INTERNAL
CROWBAR
PROTECTION
IS
DESIGNED
INTO
THE
AMPLIFIER
TO
PROTECT
AGAINST
INPUT
OVERDRIVE*
The
amplifier
is
protected
by
a
fast
acting
Crowbar
circuit*
The
Crowbar
may
be
activated
by
an
input
signal
greater
than
required
for
full
output
power*
When
the
input
signal
reaches
a
level
that
may
cause
damage
to
the
amplifier
power
stages*
the
28
volt
power
supply
is
turn&d
OFF
and
the
red
Overload
light
on
the
panel
is
activated*
Typically*
the
input
level
required
to
activate
the
Crowbar
is
approximately
*2
to
+3
dBm*
To
reset
the
Crowbar*
reduce
the
input
RF
to
OdBm
or
lower,
and
push
the
Reset
switch
(S3)
located
by
the
Overload
light
on
the
front
panel„
2—1
REV-
2.2
AMPLIFIER
OPERATION
Figure
2.I
shows
the
Model
10W1000
Amplifier
in
pictorial
form.
1
1
^
11111111111111
^^
FIGURE
2.1
AMPLIFIER
OPERATION
Turn
On
Sequence:
1.
Connect
input
signal
to
INPUT
connector.
2.
Connect
load
to
OUTPUT
connector.
3.
Select
either
120/240
VAC
operation
by
means
of
switch
located
on
rear
of
unit.
4.
Activate
power
switch
to
ON
position.
A
red
indicator
light
mounted
within
the
switch
will
light
when
power
is
applied.
CAUTION:
DO
NOT
CONNECT
UNIT
TO
240
VAC
MEASURED
LINE
TO
LINE.
TO
DO
SO
WOULD
RESULT
IN
ONE
SIDE
OF
THE
LINE
NOT
BEING
FUSED,
CREATING
A
HAZARDOUS
SITUATION.
THE
240
VAC
FEATURE
IS
DESIGNED
PRIMARILY
FOR
USE
IN
COUNTRIES
HAVING
240
VAC
MEASURED
LINE
TO
NEUTRAL.
2-2
REV-
SECTION
III
THEORY
OF
OPERATION
3.1
INTRODUCTION
Refer
to
Block
Diagram
No.
1001676.
The
input
signal
to
the
amplifier
is
connected
through
directional
coupler-
(A3A4)
and
gain
equalizer
(A3A5)
to
J1
of
low
level
/driver-
amplifier
(All.
A1
consists
of
low
level
amplifier
(A1A1)
and
driver
amplifier
(A1A2).
The
gain
of
A1
is
36dB
minimum.
The
output
of
A1
drives
the
input
of
final
amplifier
(A2),
where
the
input
signal
is
split
by
A2A5
into
four
equal
signals
and
drives
power
amplifiers
A2A1,
A2A2,
A2A3
and
A2A4.
Their
outputs
are
combined
together
by
power-
combiner
A2A6
and
drives
the
10
watt
RF
output.
The
gain
of
final
amplifier-
A2
is
4dB
minimum.
The
low
1
evel
/driver
Amplifier-
fil
consists
essentially
of
five
(5)
cascaded
stages
of
broadband
transistor
amplifiers
and
a
two
stage
output
which
yield
a
total
power
gain
greater
than
36dB.
Input
and
output
matching
networks
are
utilized
to
provide
optimum
power-
transfer
of
the
signal
to
and
from
the
amplifier
with
a
50
ohm
source
and
load
impedance.
Intra-stage
feedback
is
also
used
to
further
flatten
the
frequency
response
and
bias
stabilization
of
the
individual
stages
is
provided.
The
self-contained
power
supply
employs
a
full
wave
rectifier,
two
(2)
integrated
circuit
regulators
to
provide
stable,
low
ripple,
regulated
output
voltages.
3.2
AMPLIFIER
SECTION
The
Model
10W1000
contains
a
low
level
driver
amplifier
and
a
final
amplifier.
Each
will
be
explained.
3-1
REV-
3.2.
1
Low
Level
Driver
Amplifier
Refer
to
Schematic
Diagrams
No.
1001676,
1002044,
and
1001495.
The
low
level
driver
amplifier
is
shown
in
block
diagram
No.
1001676.
The
input
signal
to
the
amplifier
is
fed
from
the
input
connector
through
a
matching
network
to
the
base
of
the
first
transistor
amplifier
stage.
The
component
values
in
this
network
are
chosen
to
effect
a
compromise
between
obtaining
the
best
VSWR
and
the
lowest
insertion
loss.
The
first
stage
is
connected
in
the
common
emitter-
mode
with
the
emitter
connected
to
ground
through
two
resistors.
This
configuration
allows
the
selection
of
the
emitter
resistors
to
achieve
the
desired
stage
gain.
The
collector
voltage
(+>
is
supplied
to
this
stage
from
the
transistor
immediately
above
it
(refer
to
Diagram
No.
1001495).
This
allows
the
RF
transistor
to
operate
at
a
constant
DC
current
and
provides
a
high
degree
of
protection
since
the
transistor
current
is
independent
of
over-drive
and/or
short
circuits.
Temperature
dependence
is
also
avoided.
The
required
decoupling
and
bypassing
of
the
positive
supply
is
provided
by
ferrite
beads
and
capacitors.
A
coupling
network
is
used
to
route
the
output
of
the
-first
stage
to
the
base
of
the
second
stage.
The
first
five
stages
are
coupled
in
substant
i
al
X
y
tihe
same
manner
with
the
fxftn
stage
matched
to
a
50
ohm
output
impedance.
The
output
of
the
fifth
stage
(refer
to
Diagram
No.
1002044)
is
applied
through
an
input
matching
network
to
the
input
of
the
2
stage
output
amplifier,
Q2.
The
collectors
are
transformer-
coupled
to
the
output,
which
has
a
50
ohm
impedance.
£31
and
Q3
are
bias
stages
for
£32
and
help
02
to
operate
at
a.
constant
DC
current.
3.2.2
Final
Amplifier-
Ref
er
to
Schematic
Diagrams
No.
1001676
and
1001678.
The
final
amplifier
is
shown
in
block
diagram
No.
1001676.
The
input
signal
is
split
by
A2A5
into
four
equal
signals
and
drives
four
identical
power
amplifiers.
Only
one
will
be
discussed.
The
input
signal
is
applied
through
an
input
matching
network
to
the
input
of
the
2
stage
amplifier
Q2.
The
collectors
are
transformer
coupled
to
the
output
which
has
a
50
ohm
impedance.
Q1
and
£33
are
bias
stages
and
help
to
operate
£32
at
a
constant
bias.
3-2
REV-
3,
3
POIRIER
SUPPLY
SECTION
Refer
to
Schematic
Diagrams
No,
1001208.
Input
AC
power
is
fed
through
RF1
filter-
FLi
before
being
switched
by
the
main
power
switch,
SI,
The
AC
power
indicator
is
an
integral
part
of
Si.
S2
serves
to
select
the
primary
tap
confi.guration
of
Ti
for
operation
on
either
120
or
240
VAC.
CAUTION;
DO
NOT
CONNECT
UNIT
TO
240
VAC
MEASURED
LINE
TO
LINE.
TO
DO
SO
SHOULD
RESULT
IN
ONE
SIDE
OF
THE
LINE
NOT
BEING
FUSED,
CREATING
A
HAZARDOUS
SITUATION.
THE
240
VAC
FEATURE
IS
DESIGNED
PRIMARILY
FOR
USE
IN
COUNTRIES
HAVING
240
VAC
MEASURED
LINE
TO
NEUTRAL.
The
power
supply
utilises-
a
full
wave
rectifier
on
A1
and
A3
assemblies.
DC
output
from
the
rectifiers
is
filtered
by
Cl*
Ai
supplies
regulated
+VDC
to
the
low
1
evpl
amplifier
(A1A1.)
and
A3
supplies
regulated
+VDC
to
the
driver
amplifier-
(A1A2)
»
Ai
supplies
-*-VDC
to
the
protection
(zir-uui
t
assembly*
A2*
3,3.1
Regulators
MPLV
3.3.I,1
Regulator
A3A3
Refer
to
Schematic
Di&qr&m
Na«
1001098.
The
full
wave
rectifier
consists
of
CR1
and
CR2.
Capacitors
Cl
and
C2
are
connected
in
para11
el
across
the
rectifiers
to
suppress
transients
caused
by
the
reverse
recovery
of
the
diodes.
The
filtered
DC
output
from
the
rectifiers
pass
through
the
series
regulator
Ul,
pre-regtilator
and
current
boost
transistor
located
external
to
regulator
assembly,
Ui
is
a
linear
integrated
circuit
with
adjustable
output
c.urr-&.nt
and
voltage.
R2
adjusts
the
output
current
and
R3
adjusts
the
output
voltage.
Ul
also
contains
power
limiting*
thermal
shutdown
and
xnput
overvoltage
protection.
The
overload
light
DS2
is
located
on
the
front
panel
and
will
light
when
regulated
VDC
approaches
zero.
A
crowbar
will
cause
DS2
to
light
and
must
be
reset
to
restore
proper
operation.
To
reset
the
crowbar
reduce
the
input
to
OdBm
and
push
the
red
switch
(S3)
located
una^r
the
overload
light
on
the
front
panel•
3-3
REV-
3.3.1.2
Regulator
A3A1
Refer
to
Schematic
Diagram
No.
1001507.
The
full
wave
rectifier
consists
of
CR1
and
CR2.
Capacitors
Cl
and
C2
are
connected
in
parallel
across
the
rectifiers
to
suppress
transients
caused
by
the
reverse
recovery
of
the
diodes.
The
filtered
DC
output
from
the
rectifiers
pass
through
the
series
regulator
U1.
Ui
is
a
linear
integrated
circuit
with
adjustable
output
current
and
voltage.
R2
adjusts
the
output
current
and
R3
adjusts
the
output
voltage.
Ui
also
contains
power
limiting,
thermal
shutdown
and
input
overvoltage
protection.
R1
and
VR1
output
voltage
goes
to
DS2
and
protection
circuit.
3-4
REV-
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