Motorola MSF 5000 Instruction Manual page 180

Chapter
4
Alignment
MSF
5000
Instruction Manual
Alignment Procedures
CAUTION
Never
attempt
to
adjust the Prefilter or Postfilter for
the
purpose of obtaining maximum station output
power.
1.
On the control tray, set the
Acc Dis/Reset switch
to
Acc Dis.
2.
Disconnect the
PA input
cable from the output of the Prefilter (J501).
Refer
to
Figure
4-9
for
the
location of J501.
INPUT
OUTPUT
J501
J57 TENSION NUT
INPUT\
L14
©
J15 J16 J17 J18
0
J120
J13°
PREFILTER ASSEMBLY POST FILTER ASSEMBLY
0453
417
OUTPUT
L12
MSFI012
021894KOM
Figure 4-9
Duplexer Tuning
Screws
3.
Connect
a
50
Q load
to J501.
4.
Set the
signal generator
to the transmitter tuning channel frequency.
5. Adjust
the
signal generator output
to
0
dBm
(225
mV).
If the Preselector is
properly aligned,
connect the signal generator to the
transmit antenna connector on
the
Junction
Box.
Otherwise, connect the
signal generator
to the Postfilter output (J10).
6.
Detune
the Postfilter
by turning L15 through L17
CCW
until they
extend
approximately
1/2" from the tension nut.
7.
Connect
the
tuning
probe to J18 on the Postfilter.
8.
Adjust
L18 for maximum indication
on the millivoltmeter.
9.
Adjust L17 for minimum indication on the millivoltmeter.
10.
Move
the
tuning
probe to J17 on the Postfilter.
11.
Adjust
L16 for minimum indication on
the millivoltmeter.
12.
Move
the
tuning
probe
to
J16 on the Postfilter.
13.
Adjust
L15 for minimum indication on the millivoltmeter.
4-14
68P81092E04
3/19/94
Chapter
4
Alignment
MSF
5000
Instruction Manual
Alignment Procedures
CAUTION
Never
attempt
to
adjust the Prefilter or Postfilter for
the
purpose of obtaining maximum station output
power.
1.
On the control tray, set the
Acc Dis/Reset switch
to
Acc Dis.
2.
Disconnect the
PA input
cable from the output of the Prefilter (J501).
Refer
to
Figure
4-9
for
the
location of J501.
INPUT
OUTPUT
J501
J57 TENSION NUT
INPUT\
L14
©
J15 J16 J17 J18
0
J120
J13°
PREFILTER ASSEMBLY POST FILTER ASSEMBLY
0453
417
OUTPUT
L12
MSFI012
021894KOM
Figure 4-9
Duplexer Tuning
Screws
3.
Connect
a
50
Q load
to J501.
4.
Set the
signal generator
to the transmitter tuning channel frequency.
5. Adjust
the
signal generator output
to
0
dBm
(225
mV).
If the Preselector is
properly aligned,
connect the signal generator to the
transmit antenna connector on
the
Junction
Box.
Otherwise, connect the
signal generator
to the Postfilter output (J10).
6.
Detune
the Postfilter
by turning L15 through L17
CCW
until they
extend
approximately
1/2" from the tension nut.
7.
Connect
the
tuning
probe to J18 on the Postfilter.
8.
Adjust
L18 for maximum indication
on the millivoltmeter.
9.
Adjust L17 for minimum indication on the millivoltmeter.
10.
Move
the
tuning
probe to J17 on the Postfilter.
11.
Adjust
L16 for minimum indication on
the millivoltmeter.
12.
Move
the
tuning
probe
to
J16 on the Postfilter.
13.
Adjust
L15 for minimum indication on the millivoltmeter.
4-14
68P81092E04
3/19/94