ALIGNMENT
OF
PLL
AND
CARRIER
OSCILLATOR
1.
Test equipment required:
a.
Oscilloscope (DC - 50 MHz)
b.
Frequency counter (0 - 30 MHz)
c.
DC
Power Supply (13.8V 100
mA)
d.
DC
Voltmeter
(1
OV
Maximum
100Kohm/V)
e.
50 ohm Load
2.
Alignment
procedure:
(See
page
8)
Connect Test Equipment
as
shown below.
STEP
PRESET TO
CONNECTIONS
ADJUSTMENT
REMARKS
1
RX, AM, CH19
TP6 L24 Adjust
for
max.
output.
Clarifier: in center position
2
RX, AM,
CH
1
TP7 L17
Adjust
for
2 V reading on Voltmeter.
Clarifier: in center position
3
Same
as
Step 1 TP8 L16
Adjust
for
max.
output.
4
Same
as
Step 1
TP8 CT6
Adjust
to
obtain 34.985 MHz ±20
Hz
on frequency Counter.
5
RX, USB, CH19
TP8
CT4
Adjust
to
obtain 34.9875 MHz ±20
Hz
Clarifier, in center position on frequency Counter.
6
RX, LSB, CH19
TP8 CT5
Adjust
to
obtain 34.9825 MHz ±20 Hz
Clarifier: in center position
on frequency Counter.
7
TX, LSB, CH19
TP8
VR9
Adjust
to
obtain 34.9825 MHz
±20
Hz
on frequency Counter.
S
Same
as
Step 7
TP9 CT3
Adjust
to
obtain 7.7975 MHz
±5
Hz
on frequency Counter.
9
TX,USB,CH19
TP9 CT2
Adjust
to
obtain 7.8025 MHz ±5
Hz
on frequency Counter.
PLL
AND
CARRIER
OSCILLATOR
TEST
EQUIPMENT
SETUP
EJE]
DC Power Supply
13.8V
-9-
Frequency Counter
o Oscilloscope
DC
Voltmeter
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