Pll Adjustment - Icom IC-730 Maintenance Manual

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8 - 2 PLL ADJUSTMENT
Adjustment
Adjusting procedures
item
LO adjustment 1) Connect an R F voltmeter to R 11 of
the PLL unit.
2) Adjust L1 and L2 so that the level
becomes maximum.
Locked loop
1) Connect the oscilloscope (for 20 MHz)
adjustment
to R26 of the PLL UNIT.
2) Adjust L3 and L4 so that the level
becomes maximum.
Lock
1) Set the mode switch to AM or CW and
adjustment display frequency at 13.900.0 MHz.
2) Connect the oscilloscope to R28 of the
PLL UNIT.
3) Adjust the core of L8 so that the volt-
age is 4.8 to 5.2V.
4) Set the displayed frequency at
14.599.0 MHz.
5) Adjust the core of L8 so that the volt-
age is 1.8 to 2.2 V.
Measuring
instruments
RF volt-
meter
Oscilloscope
Oscilloscope
or DC volt-
meter
M4M
Measuring location Adjusting location
Number of
Instrument
adjusting
reading
UNIT Terminal UNIT Parts location
PLL R11
CD
PLL L1,L2
Maximum
~
100 mVor
more.
PLL R26
@
PLL L3,L4 Maximum
[!§J
2.5 V pop or
more.
PLL R28
®
PLL
L8
4.8-5.2V
~
(13.900.0 MHz)
1.8-2.2 V
(14.599.0 MHz)
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