Wavetek 3000 - AM;FM Vernier Voltage Adjustment C316

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Set
FREQUENCY switches for 300 MHz and
adjust M172 300MHzpot . for
OV
on scope
and a counter reading of 300 MHz . Repeat
this step, using
applicableM172 pots .,
for frequencies of 350, 400 and 450 MHz .
Refer to Figure 5-4 for
M172 pot .
loca-
tions .
Set FREQUENCY switches to 500 MHz . Ad-
just M172 500 MHz
pot .
for a scoperead-
ing near 0 V . Increase FREQUENCY to
520 MHz and note scope indication ;
then,
adjust 500 MHz pot . t o give
scope
indi
cations at 500 and 520 MHz
that

are
symmetrical
about 0
V .
Recheck 450MHz
and adjust 450
MHz
pot .

for 0 V on
scope
.
Recheck 500 and 520 MHz ; adjust
500 MHz pot . a s indicated above .
Set FREQUENCY
to 100 MHz and adjust M172
100 MHz.pot .
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for 0 V on scope and a
v ,
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1~, .~ . .
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o . d V
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J
C .
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,A
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.
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.
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1st
h i
'>
3a
~4 2 14
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0,00
0
0
o
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r
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O 0
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°
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000
0000
8
00000
Figure 5-4 . M172 Controls
-0,q
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_2
.0
-4
.
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U 
ioa 5~
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MAINTENANCE
counter reading of 100 MHz .
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Repeat
using appropriate M172 pots .,for 50 MHz
and
0 MHz . Repeat this step until 0 V
is obtained on scope at 100, 50 and 0
MHz .
Connect digitalvoltmeter to M34 pin 14 .
Step through frequencyrangefrom 1 MHz
to 520
MHz
in 10
MHz
steps to find fre-
quencyhaving highestleveler voltage ;
then adjust M9W control (B) for +1
.0
VDC
at this frequency setting .
5 .3.9 AM/FM Vernier VoltageAdjustment
C316
NOTE ;

The Modulation Board (C316)
contains a SIZE ADJ pot . (C) and a BAL-
ANCEADJ pot
. (D) which
are factory
adjustments
.

DO NOT
change
setting of
these
two
controls .