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LB131154
ADJUSTMENTS
Initial
Turn-On
1.
2.
3.
4.
Apply
power
to
mobile
radio
by
pressing
POWER switch
on control
unit
to
"on"
position
and
set
Frequency
Selector
Switch
to Fl.
APPLY
power
to
vehicular
repeater
radio
by
depressing
POWER
switch
on
vehicular
charger
to
the
"on"
position.
The ON indicator
should
glow.
Press
the
REPEATER pushbutton
switch
on the
vehicular
charger
to
the
"on"
position.
The
repeater
is
keyed
for
a
short
period
of time.
Verify
that
a short
(l/2
second)
transmission
is
observed
from
the vehicular
repeater
transmit-
ter
as
indicated
on wattmeter.
The
ENABLED
indicator
should
glow.
BASE-TO-PORTABLE ADJUSTMENTS
Type
90 Encode Modulation
Adjustment
1.
On Vehicular
Repeater
System
board
connect
TP3
to
TP6 and
TP17 to
TP8.
Using
the
devia-
tion
meter
measure
the
Type
90
Tone deviation.
Adjust
R605 on
Type 90 Encode/Decode
Module
as
necessary
to obtain
3 kHz devia-
tion.
Remove jumpers.
Mobile
Squelch
Adjustment
Vehicular
Repeater
Systems
board.
1.
Apply
an
on-frequency
signal
with
20
dB
quieting
to
the
mobile
radio
antenna
jack
(measured
at
5902-4)
on
Vehicular
Repeater
Systems
board.
2.
Adjust
MOB SQ ADJ control
R6 on
the
vehicular
repeater
system
board
so that
a voltage
at
test
point
TP9
on
the
vehicular
repeater
system
board
switches
from
less
than
1 volt
to
more
than
8 volts.
3.
Observe
that
the
vehicular
repeater
keys
with
this
20 dB
quieting
signal.
Mobile
Modulation
Adjustment
1.
2.
3.
4.
APPLY an
on-frequency
1000
uV
signal
modulated
with
1000 Hz to
the
vehicular
repeater
antenna
jack.-~-
Adjust
MOB MOD ADJ control
Rll
on the vehicular
repeater
system
*
board
for
23 kHz
deviation
on
mobile
radio
transmitter
output.
Remove jumper
from.TP17
and TP8.
i
If
optional
Mobile
Channel
Guard
is
present,
modulate
the
RF
input
with
the
proper
Channel
Guard
tone.
Verify
that
the
repeater
is
keyed
as
indicated
on the wattmeter.
PORTABLE-TO-BASE
Repeater
Squelch
Adjustment
1.
2.
3.
4.
Connect
a
jumper
between
TP13
and
TP5
on
Vehicular
Repeater
Systems
board.
Verify
that
the
mobile
radio
is
keyed.
APPLY
an
on-frequency
20
dB
quieting
signal-to
the vehicular
repeater
antenna
jack.
Adjust
RPT SQ ADJ control
R25 on
the
vehicular
repeater
system
board
so
that
the
voltage
at
test
point
TPlO
switches
from
less
than
1 volt
to more than
8
volts.
Repeater
Modulation
Adjustment
1.
APPLY a
1000
uV
on
frequency
signal
modulated
with
1000 Hz to
the
vehicular
repeater
antenna
jack.
2.
Adjust
RPT MOD ADJ control
R3 on
vehicular
repeater
system
board
for
f3 kHz deviation.
3.
Remove jumper
connected
between
TP13 and
TP5.
Verify
that
mo-
bile
radio
is unkeyed.
4.
Apply
an
on
frequency
signal
with
proper
Channel
Guard
tone
to
repeater
antenna
jack.
The
mobile
radio
should
be keyed.
5.
Remove the CG and 1000 uV signal
from
the
RF generator.
The
mobile
should
be unkeyed.
8
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