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MSF
5000
Instruction Manual
Chapter
1
Description
Intermediate Power Amplifier
Intermediate Power Amplifier
The Intermediate Power Amplifier (IPA)
is mounted in the top of the
RF
Tray,
as
shown in Figure
1-32.
A
block diagram of
the
IPA
is
shown in Figure
1-33.
The IPA
consists of the
following
circuits:
OO
+9.6 Voltage
Regulator
©
Power Amplifier Circuit
INTERMEDIATE POWER AMPLIFIER
m
RIE IMATE
ANE
O
e
R409
I-
CUT BACK
POWER
0101
CONTROL
CIRCUITS
1
RECEIVER
SYNTH ESIZER
TRANSMITTER SYNTHESIZER
Pa
6"
Rass
ead
OVERDR
ve
ADJ
© 6"
THRESHOLD CONTROL
POWER
SET
ce
R426
Rass
IF
AMPLIFIER
&
DETECTOR CIRCUITS
3
PWR
CIRCUITS
CIRCUITS
R191
FAGC
MOD
POWER
ro
6
AX
METERING
METERING
MSFI078
022294JNM
Figure 1-32
Intermediate
Power Amplifier
+9.6
Voltage Regulator
The
+9.6
voltage regulator
operates
independently from
the other sections of the
IPA. The
series
regulator circuit provides the station
with
a
clean +9.6
Vdc.
The filtered
+13.8
Vdc (A+)
Power Supply output
is the source
voltage for
generating
the +9.6
Vdc. The
+9.6
Vdc
is filtered
again
by
the
Uniboard.
68P81092E02
3/19/94
1-61
MSF
5000
Instruction Manual
Chapter
1
Description
Intermediate Power Amplifier
Intermediate Power Amplifier
The Intermediate Power Amplifier (IPA)
is mounted in the top of the
RF
Tray,
as
shown in Figure
1-32.
A
block diagram of
the
IPA
is
shown in Figure
1-33.
The IPA
consists of the
following
circuits:
OO
+9.6 Voltage
Regulator
©
Power Amplifier Circuit
INTERMEDIATE POWER AMPLIFIER
m
RIE IMATE
ANE
O
e
R409
I-
CUT BACK
POWER
0101
CONTROL
CIRCUITS
1
RECEIVER
SYNTH ESIZER
TRANSMITTER SYNTHESIZER
Pa
6"
Rass
ead
OVERDR
ve
ADJ
© 6"
THRESHOLD CONTROL
POWER
SET
ce
R426
Rass
IF
AMPLIFIER
&
DETECTOR CIRCUITS
3
PWR
CIRCUITS
CIRCUITS
R191
FAGC
MOD
POWER
ro
6
AX
METERING
METERING
MSFI078
022294JNM
Figure 1-32
Intermediate
Power Amplifier
+9.6
Voltage Regulator
The
+9.6
voltage regulator
operates
independently from
the other sections of the
IPA. The
series
regulator circuit provides the station
with
a
clean +9.6
Vdc.
The filtered
+13.8
Vdc (A+)
Power Supply output
is the source
voltage for
generating
the +9.6
Vdc. The
+9.6
Vdc
is filtered
again
by
the
Uniboard.
68P81092E02
3/19/94
1-61
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