Realistic STA-85 - Page 8

FM
RF AND
IF ALIGNMENT
Zin
=
50 o
(75
o)
FM Dummy
Antenna
to
300 S) antenna terminal of Receiver
Zout
=
3OO Sl
(balanced)
8
Signal
generator
output
should be no higher
than necessary to obtain an
output reading.
set selector switch
to FM.
Signal
Generator deviation: 75k{z NOTE:
Be sure to disconnect FM
line cord
antenna
during
alignment.
STEP
SIGNAL
GENERATOR
COUPLING
SIGNAL
GENERATOR
FREOUENCY
RECEIVER
DIAL
SETTING
INDICATOR
ADJUSTMENT
Refer Fig. 4.
REMARKS
1
Connect to FM
Antenna Termi-
nal through
FM
Dummy
Antenna
(300
O)
Fig.
2
90
MHz
(400
Hz
Mod.)
90
MHz
AC Voltmeter
connected to
TAPE
OUT
jack
L101
(ANT.
COIL)
L102
(RF
COIL)
L 103
(OSC.
COIL)
Adjust
for maxi-
mum reading on
AC Voltmeter.
2
Same as
Step 1
106
MHz
(400
Hz
Mod.)
106 MHz
Same as
Step
1
TC1 O1
(ANT.
Trimmer)
TC1O2
,
(RF
Trimmer)
TC1
03
(OSC.
Trimmer)
Same as Step 1
Repeat
steps 1
& 2
until
no further
improvement is
possible.
3
Same as
Step 1
90 MHz
(400
Hz Mod.)
90
MHz
Same as Step 1 T101
flFT)
Same as Step
1
4
Same
as Step 1
98 MHz
(400
Hz Mod.)
98
MHz
DC Voltmeter
connect
across R21 1
(s.9
Ks,)
T201
(Bottom
Core)
Adjust for
zero
reading
on
DC
Voltmeter.
5
Same
as Step 1
98 MHz
(400
Hz Mod.)
98 MHz
Distortion
Meter
con-
nected to
TAPE
OUT
jack
T201
(Top
Core)
Adjust for mini-
mum distortion.
6
Same
as
Step 1
98 MHz
(400
Hz Mod.)
98
MHz
Receiver's
SIGNAL
Meter
VR2O3
Adjust
for 70o/o
reading of full
scale
with input
of
1 mV.
7
Same as
Step
1
98 MHz
(400
Hz Mod.)
98 MHz
Oscilloscope
connect to
TAPE OUT
jack
VR2O4
Adjust
so
output
just
appears
with
an input signal
level
of 5
pV.
For European
model,
the lowest
frequency
of
FM
tuning range
should
not
be below 87.5 MHz.
125 sl
(112.5
s))
50 a
(75
a)
150 r,
Fis.2
FM DUMMY ANTENNA