Realistic STA-21 - Page 8

@l-"o'"
"o'''''ou'
(TC
1O3)
FM
OSC,
TRIMMER
[mAN___r%3i*,
ta_\
Elf-
FM
lsr
lF
rr
rolr
ALIGNMENT
Signal
generator
output
should be no
higher than necessary
to obtain an output
reading.
Maintain
line voltage at
120 volts.
{UL,
C.S.A.}
(Use
220/240
VAC For European
&
Australian
Models.)
Set SELECTOR Switch
to AM.
See P.C.B.
illustrations for
alignment
points/adjustments.
AM ALIGNMENT SET-UP
AM INTERNAL
BAR ANTENNA
Scope
Figure
5
-8-
EOUIPMENT
REOUIRED
1. AM
Signal Generator
2.
AC
Voltmeter
3. Oscilloscope
AM
IF&
NOTES:
TUNER COIL
rrc
101)
(rc
104]
FM ANT
AM ANT
TRIMMER TRIMMER
&
TRIMMER
LOCATIONS
(TC
102)
(TC 1O5)
FM RF AM O$,
TRIMMER
TRIMMER
RF
a
o
a
a
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. 5.
455
kHz
(4ob
Hz,30% MoD)
Point
of non-
interference
(near
600 kHz)
AC Voltmeter
tO TAPE
OUT
JACK
T
106
1 107
T
108
T
109
Adjust for
maximum
reading.
2
Same as above
600
kHz
(400
Hz,
30o/o
MOD)
600 kHz
Same as above
T
105
(OSC
Coil)
L 106
(AM
ANT
Coil)
Adjust for
maximum
reading.
3
Same as above
1400
kHz
(400
Hz,
30o/o
MOD)
1400 kHz Same as above
TC
105
(OSC
Trimmer)
TC 104
(ANT
Trimmer)
Adjust
for
maximum
reading.
4
Repeat
steps 2 and 3 ur
rtil
no further change is noticed.
5
Same as step
'l
1000 kHz
(400
Hz,
30%
MOD)
Output
level
to
100 mV,/m
Point of non-
interference
and
no signal
AM
Strength
Meter
Select
value of
R 160
Meter
Pointer
on
Receiver
should
indicate
between
80o/o
and
90% on
the Meter.
AM SIGNAL
GENERATOR
2'(60cm)-
tl
r)r'\
AC
VOLTMETE
R
@
Cf)B---
[.=-rE[!--=
STA-21
TAPE OUT
(L
or R)