Alinco DX-SR9 E, Руководство по обслуживанию

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41
3) PA Unit Adjustment
Idling Current Adjustment Setting
SWR Detection Adjustment Setting
Adjustment the idle current without
input signal.
DC power supply
DC current meter
30A
DC current meter
3A
DXSR9 PA unit
adjustment tool
DC current meter
1A
DXSR9
Adjust SWR at approximately 50W.
DC power supply
SG or Signal
generator tool
DXSR9 PA unit
adjustment tool
DC voltage
meter
DXSR9 PA unit Power meter
ITEM
Pre-Drive
Idling Current
Adjustment
Drive
Idling Current
Adjustment
Final
Idling Current
Adjustment
SWR Detection
UNIT
PA
PA
PA
PA
ADJ.SPOT
VR802
VR804
VR801
VR803
TC901
ADJUSTING METHOD
The cable of CN801 is removed.
VR801,VR803 : Minimum (Turn left.)
Connect the current meter between
CP808 (+) and CP804 (-), then adjust
VR802 to 100mA in transmission mode.
Connect JP801 by soldering after
adjustment.
Connect the current meter between
CP808 (+) and CP806 (-), then adjust
VR804 to 700mA in transmission mode.
Connect JP802 by soldering after
adjustment.
Turn VR801 and VR803
counterclockwise fully, check the total
current in transmission mode.
Turn VR801 clockwise slowly so that
the total current increases 400mA.
Then turn VR803 clockwise slowly so
that the total current increases 400mA.
As a result, the total current increases
800mA.
Adjust the output power to 50W, then
adjust the TC901 so that REV (CP901)
voltage minimum.
CONDITION
SSG : OFF
Mode : USB
SSG : OFF
Mode : USB
SSG : OFF
Mode : USB
1.9000MHz
Mode : USB
SG output -14dBm
into CN801.
(Range of current
meter:30A)
4) MAIN Unit Adjustment
(a) RX Adjustment
SG
DXSR9
ITEM
TCXO
Interstage
Tuning
FM Sensitivity
Total Gain
S Meter
Noise Blanker
UNIT
MAIN
MAIN
MAIN
MAIN
MAIN
MAIN
MAIN
ADJ.SPOT
VR601
L149
L150
L156
L143
L116
L113
L120
L179
L180
L150
L156
L143
L116
L113
VR106
VR105
VR104
L128
L126
L127
ADJUSTING METHOD
Adjust it so that the TP601 output
becomes 16.777216MHz ± 5Hz at a
frequency counter.
Adjust every following group
repeatedly to obtain the maximum AF
output level.
L149, L150, L156
L143, L116, L113
L120
L179, L180
Adjust repeatedly to obtain the
maximum SINAD.
SINAD should be 13dB or more.
Adjust SP output by setting the AF
gain to about 1V. The output level
should be 0dB.
Adjust only the noise output to -28dB
by turning OFF SG output.
The indicator between first and
second digits is flashing.
The 9th digit flashing.
Adjust VR105 and VR104 repeatedly.
Adjust it so that noise level becomes
minimum. Then the S meter
disappears.
CONDITION
14.1000MHz
MODE : USB
RF : +10dB
SG : 0dBu
Mod
： OFF
14.1000MHz
MODE : FM
RF : +10dB
SG : 0dBu
1KHz 1.75KHz/DEV
14.1000MHz
MODE : USB
RF : 0dB
SG : 40dBu
14.1000MHz
MODE : USB
RF : 0dB
SG : 20dBu
SG : 40dBu
14.1000MHz
MODE : USB
RF : +10dB
SG : 40dBu
FM MOD 20Hz
100KHz/DEV
Noise Blanker ON
(FUNC
→
9 key)
Distortion meter
Audio volmeter
Oscilloscope
ANT SP OUT