RXD-M57MP
6
ADJUSTMENT
TUNER ALIGNMENT PROCEDURE
Equipment needed:
1. AM Signal generator
2. FM Signal generator
3. DC Voltage meter
4. Oscilloscope
5. Output meter (VTVM)
AM Alignment
Step
S/G Frequency
Dial Setting
Indicator
Adjust
Remarks
1
450 kHz (1 kHz 30% mod.)
612 kHz
Connect
oscilloscope or
VTVM to speaker
jack
T101 Adjust
for
maximum
output
2
531 kHz (1 kHz 30% mod.)
Low end
Connect DC voltage
meter to test point Vt
and ground
L102
Adjust until
Vt equal to
1.5 – 0.05V
3
1602 kHz (1 kHz 30% mod.)
High end
Same as step 2
Confirm Vt:
6.5~8.5V
4
612 kHz (1 kHz 30% mod.)
612 kHz
Same as step 1
L103
Maximum output
5
1404 kHz (1 kHz 30% mod.) 1404 kHz
Same as step 1
TC101
Maximum output
6
Repeat steps 4 and 5 to minimize tracking error
7
999 kHz
(1 kHz 30%mod.)
999 kHz
Same as step 1
Offset is less than
6 dB.
60 cm
AM SIGNAL GENERATOR
AM LOOP ANT
AM LOOP
ANTENNA
DUMMY LOAD
VTVM
TEST UNIT
Figure 4. AM IF/RF Tracking
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