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9.
Place INT-EXT switch (AlS16) in EXT
ion.
10.
Adjust COMP
(AIR4) until MOD PEAK lamp (AIDSl) just
1 i
gh
100%.
11.
Turn PPM readout switch (A1S6) to on.
PPM
should
12.
13.
14.
15.
.
"001i.
Set
MOD PEAK thumbwheel to
101%.
Increase audio
slightly, PPM readout should count to "19
11
before MOD PEAK
lamp ligh
at 101%.
Set audio level until MOD PEAK lamp just lights at 100%.
Adjust
until TOTAL MOD meter (AIM!) reads 100%.
Depress POS button on AlS4A.
Adjust A2RI04 until TOTAL MOD
(A1Ml) reads 100%.
Connect a frequency counter to X.O. OUT (AIJ12).
. Adjust A2C16
un
1
the frequency is
8.000000 MHz.
NOTE:
This will
indi
L.a. exactly 10.7 MHz above the
CARRIER FREQ.
thurnbwheel (AlS2).
NOTE:
crystal
in the 691 Modul
on Monitor is a
high a6curacy crystal with stability of 2.5 PPM from
a -
60 C.
DUAL AVERAGE VOLTMETER ALIGNMENT (A3 Assembly)
1.
Calibrate PLL and Total Meter (Section 5-2)
2.
Preliminary set
up:
a.
Place thurnbwheels AlS12A and A 12B to 100%.
b.
Place
+,-
switches (AlS13A and A 1
in - position.
c.
Place
MOD-HOLD-AUTO switches (AlS14A and AlS14B) in MOD Position
d.
Depress MAIN,
button on DISPLAY SECT switch (AlS11).
3.
Remove audio
i
from the monitor.
4.
Adjust A3R74 until CH.A meter (AIM2A) zeroes.
5.
ust
A3R174
until
CH.B
meter
(AU~2B)
zeroes.
6.
Apply 400 Hz audio input until MOD PEAK lamp ( OSl) just
ligh
at 100%.
7.
Adjust MAIN
lter control (AIR15) until CH.A PEAK led just 1;
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