Realistic STA-95 - FM RF & IF Alignment

FM
RF
AND
IF
ALIGNMENT
For
European
model,
the lowest
frequency
of FM
tuning range
should not
be
below 87.5 MHz.
125a
(1
12.5s,)
Zin =
50o
(75s})
Zout
=
300O
(balanced)
FM
Dummy
Antenna
to 300O
antenna
terminal
Fig.2 FM
DUMMY
ANTENNA
B
Signal
generator
output
should be no higher
than necessary
to
obtain an output
reading
Set Selector switch
to
FM.
Signal Generator
deviation: 75
kYz NOTE:
Be sure to
disconnect
FM
line
cord antenna
during
alignment.
STEP
SIGNAL
GENERATOR
COUPLING
SIGNAL
GENE RATOR
FREOUENCY
RECE IVER
DIAL
SETTING
INDICATOR
ADJUSTMENT
Refer
Fig.
4
R EMAR
KS
1
Connect to FM
Antenna
Termi-
nal
through
FM
Dummy
Antenna
(300St)
Fis. 2
90 MHz
(400
Hz, Mod.)
90 MHz
AC Voltmeter
connected to
TAPE
OUT
jack
L1 04
(FM
OSC Coil)
Ll
01
(FM
ANT
Coil)
Ll02
(FM
RF
Coil)
Adjust for
maximum
reading
on
AC Voltmeter
2
Same
as Step 1
106 MHz
(400
Hz,
Mod.)
106 MHz
Same as Step 1
TC1
03
(FM
OSC Trimmer)
TC1
O1
(FM
ANT Trimmer)
TC1 02
(FM
BF
Trimmer)
Adiust for
maximum
readi ng
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 T1O1
(FM
IFT)
Adjust
for
maximum
readi ng
4
Same as
Step 1
90
MHz
(400
Hz.
Mod.)
90 MHz
TUNING Meter
T201
(Bottom)
(Discriminator)
Adjust for
center
point
on
TUNING
meter
5
Same
as Step 1
90 MHz
(400
Hz, Mod.)
90 MHz
Distortion
Meter
connected
to
TAPE
OUT
jack
T201
(Top)
Adjust for
minimum
d
istortion
6
Same as Step 1
98 MHz
(400
Hz, Mod.)
98 MHz
Receive r's
SIGNAL
Meter
vR202
Adjust
for
70o/o
readi ng
of
fu I
I
scale with input
of
1mV
7
Same
as Step 1
98 MHz
(400
Hz Mod.)
98 MHz
Oscilloscope
connected to
TAPE
OUT
jack
VR2O1
Adjust so
output
just
appears with
an input
signal
level
of 5
pV.
1
50s2
of Receiver.