Table of Contents
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Chapter
1
Description
MSF
5000
Instruction Manual
Power Amplifier
Peripheral
Devices
1-70
Several peripheral devices
are used to
improve transmitter performance and
protection.
Single Circulator
The single circulator is standard
on
all models
except
VHF.
The circulator is
mounted beneath or internal
to the
final
PA
and provides protection for
the
final
PA
modules against transmitter intermodulation and antenna mismatch.
Triple Circulator
The triple circulator is available
for some models to provide better isolation and
protection against intermodulation.
Duplexer
The duplexer is available on all models except high power
VHF.
The duplexer
combines the transmitter and receiver into one
RF
port. The duplexer option can
be combined
with
a
single or triple circulator, depending on
the station model.
RF
Low-Pass Filter
The low-pass filter is provided with all
stations not
having
the
duplexer option
to
attenuate transmitter harmonics.
On
VHF
models, the low-pass filter is
in
the
peripheral box. The peripheral box mounts in the
same location as the
low-pass
filter.
The peripheral box also contains
the antenna
relay when required. Other
models use a separate antenna relay mounted between
the
low-pass filter and
the
Junction
Box.
Wattmeter Element
A
wattmeter element is available on trunking stations and is mounted between
the
low-pass filter and
the
Junction
Box.
68P81092E02
3/19/94
Chapter
1
Description
MSF
5000
Instruction Manual
Power Amplifier
Peripheral
Devices
1-70
Several peripheral devices
are used to
improve transmitter performance and
protection.
Single Circulator
The single circulator is standard
on
all models
except
VHF.
The circulator is
mounted beneath or internal
to the
final
PA
and provides protection for
the
final
PA
modules against transmitter intermodulation and antenna mismatch.
Triple Circulator
The triple circulator is available
for some models to provide better isolation and
protection against intermodulation.
Duplexer
The duplexer is available on all models except high power
VHF.
The duplexer
combines the transmitter and receiver into one
RF
port. The duplexer option can
be combined
with
a
single or triple circulator, depending on
the station model.
RF
Low-Pass Filter
The low-pass filter is provided with all
stations not
having
the
duplexer option
to
attenuate transmitter harmonics.
On
VHF
models, the low-pass filter is
in
the
peripheral box. The peripheral box mounts in the
same location as the
low-pass
filter.
The peripheral box also contains
the antenna
relay when required. Other
models use a separate antenna relay mounted between
the
low-pass filter and
the
Junction
Box.
Wattmeter Element
A
wattmeter element is available on trunking stations and is mounted between
the
low-pass filter and
the
Junction
Box.
68P81092E02
3/19/94
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