Realistic STA-7 - Alignment Instructions; AM IF & RF Alignment

5. ALIGNMENT
INSTRUCTIONS
EOUIPMENT
REOUIRED
1. AM
Signal
Generator
2. AC Voltmeter
3. Oscilloscope
TUNER
(TCrOr)
FM
ANT.
TRIMMER
corl
&
(TC
rO4)
AM ANT.
TRIMMER
TRIMMER
LOCATIONS
(TCrO2)
(Tct05)
FM RF
AM OSC.
aM osc
corL
fito5)
f-
,@
FM
ANT.
(
Lrot)
M
Y
OSC
TRIMMER
(TCr03)
AM
IF
&
RF
ALIGMENT
NOTE:
.
Signal
generator
output
should
be
no
higher
than
necessary
.
Maintain
line
voltage
a,t
12O
volts.
(UL,
C.S.A.)
(Use
240 V
o
Set SELECTOR
Switch
to AM.
o
See
P.C.B.
illustrations
for
alignment
points/adjustments.
AM
ALIGNMENT
SET-UP
Figure
-17-
FM RF
COIL
(
Ll03
)
FM
OSC
CO|L
(Lro5)
to
obtain
an output
reading.
for
Australian
models.)
STEP
SIGNAL
GENERATOR
COUPLING
SIGNAL
GENERATOR
FREOUENCY
DIAL
SETTING
INDICATOR
ADJUSTMENT
REMARKS
1
Connect standard
loop
ANTENNA
to Signal
Generator
and radiate
signal
into
the AM
Ferrite
antenna.
See
Fig.
14.
455 kHz
(4OOHz,30%
MOD)
Point
of non-
interference
(near
600
kHz)
AC
Volt-
meter
to
TAPE
OUT
JACK
T106
T
107
T108
T109
Adjust for
maximum
reading.
2
Same as
above
600
kHz
(400
Hz,
30%
MOD)
600 kHz
Same
as
above
T105
(OSC
Coil)
L7O1
(AM
ANT
Coil)
Adjust for
maximum
reading.
3
Same
as above
1400 kHz
@OAHz,
30%
MOD)
1400 kHz
Same
as
above
TC105
(OSC
Trimmer)
TC't04
(ANT
Trimmer)
Adjust for
maximum
reading.
4
Repeat
STEP
1
and then
STEPs
2 and
3
until
no further
change
is noticed.
5
Same
as
step
1
1000
kHz
(4OOHz,
30% MOD)
Output level
to
5 mV/m
Point
of non-
interference
and
no
signal
AM
Strength
Meter
Select value
of
R
150
Meter
pointer
on Receiver
should
indicate
between
75%
and 85%
on
the Meter.
AM SIGNAL
GENERATOR
VOLTMETE
R
,,\
14