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Two-Way Radio
MASTR II
GE MASTR II User Manual
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CIRCUIT
ANALYSIS
LBI-4732
Rl33,
Rl45,
Cll7
and
CR104,
and
is
applied
to
the
base
of
buffer
Ql05.
Diodes
CR105
and
CR106
remove
any
amplitude
modulation
in
the
second
modulator
output.
Buffer
Ql05
is
saturated
when
no
RF
signal
is
present.
Applying
an
RF
signal
to
Ql05
provides
a
sawtooth
waveform
at
its
collector
to
drive
the
class
C
tripler,
Ql06.
The
tripler
stage
is
metered
through
Rl46.
The
output
of
Ql06
is
coupled
through
tuned
circuits
TlOl,
Tl02
and
Tl03
to
the
base
of
dobuler
Ql07,
TlOl,
Tl02
and
Tl03
are
tuned
to
one-fourth
of
the
operating
frequency.
The
doubler
stage
is
metered
through
Rl47.
The
output
of
Ql07
is
coupled
through
tuned
circuits
Tl04
and
Tl05
to
the
base
of
second
doubler
Ql08.
Tl04
and
Tl05
are
tuned
to
one-half
the
operating
frequency.
Ql08
is
metered
through
Rl48.
The
output
of
Ql08
is
coupled
through
three
tuned
circuits
(Tl06,
Tl07
and
Tl08)
to
the
base
of
amplifier
Ql09.
The
circuits
are
tuned
to
the
transmitter
operating
fre-
quency.
Ql09
is
a
class
C
amplifier
with
a
col-
lector
feed
network
consisting
of
Cl39,
Cl41,
Ll04,
Ll08
and
Rl43.
The
stage
is
metered
through
Rl49.
The
amplifier
collec-
tor
circuit
consists
of
Cl42,
Cl43,
Cl46
and
Ll05,
and
matches
the
amplifier
output
to
the
input
of
the
power
amplifier
assembly
.
POWER
AMPLIFIER
The
PA
assembly
uses
three
RF
power
transistors
and
seven
transistors
in
the
Power
Control
circuitry
to
provide
a
power
output
of
50
Watts.
The
broadband
PA
has
no
adjustments
other
than
Power
Control
po-
tentiometer
R216.
Supply
voltage
for
the
PA
is
connected
through
power
leads
from
the
system
board
to
feedthrough
capacitors
C297
and
C298
on
the
bottom
of
the
PA
assembly.
C297,
C298
and
C299,
L296
and
L297
prevent
RF
fr.om
getting
on
the
Power
leads.
Diode
CR295
will
cause
the
main
fuse
in
the
fuse
assembly
to
blow
if
the
polarity
of
the
power
leads
is
re-
versed.
Centralized
metering
jack
J205
is
pro-
vided
for
use
with
GE
Test
Set
Model
4EX3All
or
Test
Kit
4EX8Kl2.
The
Test
Set
meters
the
Ampl-1
drive
(exciter
output),
Ampl-1
power
control,
Driver
and
PA
current.
RF
AMPLIFIERS
The
exciter
output
is
coupled
through
an
RF
cable
to
PA
input
jack
J203.
The
RF
is
coupled
through
DC
blocking
capacitor
C202
to
the
base
of
Class
C
amplifier
Q201
through
a
matching
network.
The
network
matches
the
50-ohm
input
to
the
base
of
Q20l,
and
consists
of
C205,
C206,
C235,
L201,
L202
and
L203.
Part
of
the
RF
input
is
rectified
by
CR201
and
used
to
activate
the
Power
Control
circuit.
Another
portion
of
the
rectified
RF
is
applied
to
~oltage
dividers
R223
and
R224
for
metering
the
Ampl-1
drive
at
J205.
Collector
voltage
to
Q201
(Ampl-1)
is
controlled
by
the
Power
Control
circuit,
and
is
applied
through
a
collector
stabiliz-
ing
network
consisting
of
L224
and
R225
and
collector
feed
network
L204
and
C207.
The
collector
voltage
of
Q201
is
metered
through
R235
at
J205.
The
output
of
Q201
is
applied
to
the
base
of
Class
C
driver
Q202
through
a
low-
pass
filter
matching
network
(C209,
C210,
L205
and
L206).
Resistors
R202,
R203
and
R204
lower
the
gain
of
Q202.
Collector
voltage
to
Q202
is
coupled
through
a
col-
lector
stabilizing
network
consisting
of
L225
and
R233
and
collector
feed
network
L208
and
C213.
Collector
current
for
Q202
is
metered
across
tapped
manganin
resistor
R230
at
J205
(Driver
Current).
The
reading
is
taken
on
the
one-Volt
scale
with
the
High
Sensi-
tivity
button
pressed,
and
read
as
10
am-
peres
full
scale.
Following
Q202
is
an
interstage
cou-
pling
network
(C214
through
C221,
L209
through
L211,
R206
and
R207.)
The
output
is
applied
to
the
base
of
the
class
C
PA
stage,
Q203.
Supply
voltage
is
coupled
through
a
collector
stabilizing
network
consisting
of
L226
and
R234
and
collector
feed
network
C222
and
L212.
Collector
current
for
Q203
is
metered
across
tapped
manganin
resistor
R231
at
J205.
The
reading
is
taken
on
the
one-Volt
scale
with
the
High
Sensitivity
buttom
pressed,
and
read
as
10
amperes
full
scale.
The
PA
output
is
coupled
through
an
output
matching
network
(C224,
C225,
C226,
L213
and
L214,)
to
an
M-derived,
constant
K
low-pass
filter.
C230
through
C233
pro-
vides
grtiund
isolation.
The
filter
output
is
applied
to
the
antenna
through
antenna
switch
K201.
r-----------------
WARNING
-----------------,
The
stud
mounted
RF
Power
Transis-
tors
used
in
the
transmitter
con-
tain
Beryllium
Oxide,
a
TOXIC
sub-
stance.
If
the
ceramic,
or
other
encapsulation
is
opened,
crushed,
broken
or
abraded,
the
dust
may
be
hazardous
if
inhaled.
Use
care
in
replacing
transistors
of
this
type
.
5
6
8
Table of Contents
Table of Contents
2
Description
3
Circuit Analysis
3
Exciter
3
Icoms
3
Audio Preamplifier
5
Audio IC
5
Frequency Divider IC
6
Phase Modulators, Amplifiers & Multipliers
6
Power Amplifier
7
RF Amplifiers
7
Power Control Circuit
8
Maintenance
8
Disassembly
8
Access to Power Amplifier (Rear View)
8
PA Transistor Replacement
9
Alignment Procedure
11
Test Procedures
12
Power Output
12
Tone Deviation
12
Voice Deviation
12
Duty PA Assembly
14
Outline Diagrams
15
Continuous Duty PA Assembly
15
Frame Assembly
16
PARTS LIST and PRODUCTION CHANGES Exciter
17
Exciter
18
Power Amplifier (Intermittent Duty)
19
Power Amplifier (Intermittent Duty)
20
Power Amplifier (Continuous Duty)
21
Power Amplifier (Continuous Duty)
22
5
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GE MASTR II Specifications
General
Brand
GE
Model
MASTR II
Category
Two-Way Radio
Language
English
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