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Chapter
1
Description
MSF
5000
Instruction Manual
Receiver Circuitry
Receiver Circuitry
The station Receiver is comprised of several
replaceable modules located
within
the
RF
Tray, as shown
in Figure
1-35.
These modules include:
Preselector
Filter
oa
Preamplifier
/Mixer
o
Injection
Amplifier
o
Image/Injection Filter
I-F Circuitry
(part of Uniboard)
Each of
the above
circuits
are
defined
within
this section,
with
the exception
of
the
I-F
circuitry. Refer to the Uniboard section for information relating to the
I-F
circuitry.
Figure
1-35
shows
a
functional block diagram of the receiver circuitry.
15 dB
RECEIVE RF
PRESELECTOR
ANTENNA
FROM
FILTER
PRE-AMP
+9.6
V
FROM
IPA
IMAGE
FILTER
MIXER
10.7
MHz IF
LOW
LEVEL
+9 dBM
INJECTION
+2308M
INJECTION
+22dBM
RF
FROM
AMPLIFIER
FILTER
UNIBOARD
ND
LOW
Figure
1-35
Receiver Block
Diagram
Preselector Filter
The
RF
preselector filter is
rsa
mechanical filter located along the bottom of
the
RF
Tray.
The received
RF
signal from
the antenna is
applied
to the preselector
via
the
receive antenna port on the Junction Box.
1-64
68P81092E02
3/19/94
Chapter
1
Description
MSF
50
Instruction Manual
Receiver Circuitry
Receiver Circuitry
The station Receiver is comprised of several
replaceable modules located
within
the
RF
Tray, as shown
in Figure
1-35.
These modules include
Preselector
Filter
oa
Preamplifier
Mixer
o
Injection
Amplifier
o
Image/Injection Filter
I-F Circuitry
(part of Uniboard)
Each of
the above
circuits
are
defined
within
this section,
with
the exception
of
the
J-F
circui
try.
Refer
to the
Uniboard section for information relating
to the
I-F
circuitry.
Figure
1-35
shows
a
functional block diagram of the receiver
ircui
RECEIVERF
15 dB
FROM
FILTER
PRE-AMP
ANTENNA
+9.6
V
FROM
IPA
IMAGE
FILTER
MIXER
10.7
MHz IF
A+ AND
LOW
LEVEL
+9dBM
INJECTION
+2308M
INJECTION
+2
dBM
RF
FROM
AMPLIFIER
FILTER
UNIBOARD
Fure
1-35
Receiver Block
Diagram
Preselector Filter
The
RF
preselector filter is
a
mechanical filter located along the bottom of
the
RF
Tray.
The received
RF
signal from
the antenna is
applied
to the preselector
via
the
receive antenna port on the Junction Box
1-64
68P81092E02
3/19/94
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