AM ALIGNMENT PROCEDURE
INSTRUMENTS:
AM
Signal Generator modulated
with
400Hz
at
30%.
VTVM.
AM
Sweep
Generator
and Oscilloscope.
NOTE:
Set
Function Selector Switch
to
AM
Connect signal source
to
a
test
loop placed
to
radiate signals into
AM
Antenna Loop Stick ( L252).
CONNECT
OUTPUT
DIAL
Step
SIGNAL
SOURCE
FREQUENCY
METER
TO
SETTING
ADJUST
ADJUST
FOR
1
AM
Sweep Generator
455kHz
VTVM
and Oscilloscope Quiet
Point
T252
Maximum
and
Top
to
R272
(4.7 k
ohm)
Near
(Ceramic
Flat Pattern
1600kHz
Filter)
on
Oscilloscope
2
T253
Maximum
Output
3
T254
Maximum
Output
4 Repeat Steps 1
through
3
for
best
sensitivity.
5
AM
Signal Generator
600kHz
VTVM
and Oscilloscope
600kHz
L251
Maximum
Output
to
R272
(4.7 k
ohm)
6
1600kHz
1600kHz
TC1
Maximum
Output
(on
Front
End)
7
Repeat Steps 5 and 6
for
best
dial
accuracy.
8
AM
Signal Generator
600kHz
VTVM
and Oscilloscope
600kHz
L252
to
R272
(4.7 k
ohm)
T251
Maximum
Output
9
1600kHz
1600kHz
TC2
Maximum
Output
TC3
10
Repeat Steps 8 and 9
for
best
sensitivity.
POWER
AMPLIFIER
IDLING
ADJUSTMENT
INSTRUMENTS:
DC
VTVM
NOTE:
Set Function Selector Switch
to
AUX
Set Volume Control
to
minimum and set Tone/Balance controls
to
mid position.
Set Stereo/Mono Switch
to
Stereo.
Speaker Switch
to
ON.
Connect
8
ohm
(50W) resistor across left and right speaker terminals.
Step
CONNECT
OUTPUT
TO
ADJUST
ADJUST
FOR
1
DC
VTVM
between
0418
(collector)
VR402
35mV
±5mV
and
0420
(Collector)
2
DC
VTVM
between
0417
(collector)
VR401
35mV±5mV
and
0419
(Collector)
-5-
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