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ADJUSTMENT
PLL Adjustment
1.
PLL C-Loop (carrier) Check and Adjustment
1-1. Voltage-controlled oscillator (VCO) check
1.
2.
3.
4.
Connect a digital voltmeter to the TP4 terminal of
the control unit.
Turn the channel selector and read the selected
2.100.0 MHz USB.
Check that the display frequency is 2.100.0 USB
and that the voltage is 3 to 5 V.
Set the mode to 2.100.0 LSB with the MOD
key.
Check that the voltage is 0.3 to 0.5 V lower than the
USB voltage.
1-2. Output level adjustment
1
2.
. Connect an RF voltmeter to the TP5 terminal of the
control unit.
Turn L32's core of the control unit in the direction in
which it is inserted until the output becomes 0.35
Vins. (Specification: 0.35 + 0.03 Vrms)
. Clarifier Adjustment
. Set the clarifier control on the front panel to the
center click position.
. Turn VR303 of the control unit until symbol
* on
the LCD display disappears.
. Check that the same width to center clock position
of clarifier control when clarifier control is turned
right and left position. (Until symbol
* onthe LCD
display disappears.)
. PLL B-Loop Check
. Connect a digital voltmeter to the TP2 terminal of
the control unit.
. Set that the memorizing frequency is 2.100.0 MHz,
the mode is USB.
. Check that the voltage at TP2 is 1.5 to 3.0 V.
. Set that the memorizing frequency is 2.099.9 MHz,
the mode is USB.
. Check that the voltage at TP2 is 5.5 to 7.0 V.
. PLL MCF Adjustment
. Connect an RF voltmeter to the TP3 terminal of the
control unit.
. Altemately turn L25 and L26 of the control unit until
they are maximum. (Specification: 30 to 40 mV)
5. PLL A-Loop Check —
. Connect a digital voltmeter to the TP1 terminal of
the control unit.
. Set that the memorizing frequency is 22.000.0 MHz,
the mode is USB.
. Check that the voltage at TP1 is 1.5 to 2.5V.
if the voltage at TP1 is unable to 1.5 to 2.5V, adjust-
ment are as follows :
Enter 29.999.9 MHz from the numeric keypad, then
press the ENT key.
Press the MOD key to enter the USB mode.
Turn TC4 of the X58-3720-10
in the control unit until
the voltage is 6.5 + 0.1V.
. Set that the memorizing frequency is 14.000.0 MHz,
the mode is USB.
. Check that the voltage at TP1 is 1.5 to 2.5V.
lf the voltage at TP1 is unable to 1.5 to 2.5V, adjust-
ment are as follows :
Enter 21.999.9 MHz from the numeric keypad, then
press the ENT key.
Press the MOD key to enter the USB mode.
Turn TC3 of the X58-3720-10
in the control unit until
the voltage is 6.5 + 0.1V.
. Set that the memorizing frequency is 7.000.0 MHz,
the mode is USB.
. Check that the voltage at TP1 is 1.5 to 2.5V.
If the voltage at TP1 is unable to 1.5 to 2.5V, adjust-
ment are as follows :
Enter 13.999.9 MHz from the numeric keypad, then
press the ENT key.
Press the MOD key to enter the USB mode.
Turn TC2 of the X58-3720-10 in the contro! unit until
the voltage is 6.5 + 0.1V.
. Set that the memorizing frequency is 0.100.0 MHz,
the mode is USB.
, Check that the voltage at TP1 is 1.5 to 2.5V.
if the voltage at TP1 is unable to 1.5 to 2.5V, adjust-
ment are as follows :
Enter 6.999.9 MHz from the numeric keypad, then
press the ENT key.
Press the MOD key to enter the USB mode.
Turn TC1 of the X58-3720-10
in the control unit until
the voltage is 6.5 + 0.1V.
Digital voitmeter
To various
test points
To various
test points
50Q
dummy load
ANT
|
1
Power supply | Connect
13.6V
Tochassis GND
30A
power
uo
| |
cord to 13.6V
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