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OCUBIC
COMMUNICATIONS
5 . . .",
DIVIBION
ALIGNMENT PROCEIXJRE
Alignment should be performed only after making a complete performance
check of the unit.
It is advisable to then align
only those areas of the
unit necessary to bring performance up to specification.
Also, the replace-
ment of a defective
component
wil1 usually restore the units
performance
without requiring any realignment,
in most cases.
Following this procedure
will save time and help to avoid the possibility of inadverdantly misalign-
ing a section of the'unit.
INITIAL SETUP
Remove the top and bottom covers of the unit.
Set the front panel con-
trols as
ollows:
AF GAIN to off;
RF GAIN to
fully clockwise;
IF GAIN to
fully clockwise; AGC DECAY to 12 o'clockj PASSBAND to 12 o'clock; NOTCH FILT
to fully counterclockwise ;
MIC GAIN to fully counterclockwise;
PTO MODE to
PTO A;
MODE to LSB; BAND to 160 and PTT/VOX switch to PTT.
Connect a suitable power supply to
the POWER 13.8 V connector on the
rear apron of the unit.
VOLTAGE REX;ULATOR ADJUS'IMENT
Turn the AF GAIN control
clockwise to turn
the power on.
Adjust
the
power supply voltage for @V
De.
Measure the
voltage at the collector of Ql16 on the distribution board
and adjust the 10.5 V SET trimpot (R141) on the same board for a reading of
10.55
±
0.05 V
De
on the voltmeter. Vary the power supply voltage from 11 to
15 volts.
The measured voltage should change by less than
0.2 V
De.
Reset
the power supply voltage to 14 V
De.
BAND VCO ADJUSTMENT
Measure the voltage at the point labeled 160-15 M
EL
(near C138) on the
L.O. board. Adjust the coils according to the following chart for 3.75 ±O.25
V De.
BAND
160M
80M
40M
20M
15M
COIL
TlOl
Tl02
Tl03
Tl04
Tl05
Measure the voltage at the point labeled 10 M
EL
on the La board.
Set
the BAND switch to 10A and adjust Tl06 for
3.20 ± 0.1 V
De.
Switch to lOB,
IOC,
and 10D and note that voltage reading increases approximately 0.4 V
De
for each band.
BAND REFERENCE OSCILLATOR ADJUSTMENT
(
Connect a frequency counter to collector of Qlll on the
LO
board.
Set
bandswitch to
100.
Adjust the
2 MHz
oscillator trimmer capacitor
(C246) tor
a frequency of
44.000 MHz +20 Hz.
Disconnect the frequency counter.
8-8
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