Wavetek 3000 Instruction Manual page 75

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Set FREQUENCY switches
for 300 MHz and
adjust M172 300 MHz pot . for OV on scope
and a counter reading of 300 MHz . Repeat
this step, using applicable M172 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 scope read-
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 450 MHz
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 . for 0 V on scope and a
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2
14 ~J1
0,00
0
0
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r
O
0
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000
0000
8
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Figure 5-4 . M172 Controls
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MAINTENANCE
counter reading of 100 MHz . 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 digital voltmeter to M34 pin 14 .
Step through frequency range from 1 MHz
to 520 MHz in 10 MHz steps to find fre-
quency having highest leveler voltage ;
then adjust M9W control (B) for +1 .0
VDC at this frequency setting .
5 .3 .9 AM/FM Vernier Voltage Adjustment
C316
NOTE ;
The Modulation Board (C316)
contains a SIZE ADJ pot . (C) and a BAL-
ANCE ADJ pot .
(D) which
are factory
adjustments . DO NOT change setting of
these two controls .