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*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5 - 18
5-7 UX-910 ADJUSTMENTS
2ND LO LOCK
VOLTAGE
1ST LO LOCK
VOLTAGE
RECEIVER
GAIN
ATT GAIN
IDLING
POWER
BALLANCE
TRANSMITTER
GAIN
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
1
2
1
1
1
1
2
3
4
1
• Connect an optional UX-910 (1200
MHz band unit).
• Display frequency: 1270.5000 MHz
• Receiving
• Display frequency: 1240.0000 MHz
• Receiving
• Display frequency: 1300.0000 MHz
• Receiving
• Display frequency: 1280.0000 MHz
• Connect a standard signal generator
to [12 ANT] connector and set as:
Frequency : 1280.0000 MHz
Level
: 710 µV* (–50 dBm)
Modulation : OFF
• Receiving
• Display frequency: 1280.0000 MHz
• [ATT]
: ON
• Set an SSG as
:
Frequency : 1280.0000 MHz
Level
: 710 µV* (–50 dBm)
Modulation : OFF
• Receiving
• Display frequency: Any
• Mode
: CW
• Preset R61, R67, R83 to max.
clockwise, R13 to max. counter
clockwise, and C332 to center.
• Connect an RF power meter to [12
ANT].
• Connect an SSG to the check point
CP311 and set as :
Frequency : 10.8500 MHz
Level
: OFF
• Transmitting
• Display frequency: Any
• Mode
: CW
• Connect an SSG to the check point
CP311 and set as :
Frequency : 10.8500 MHz
• Transmitting
• Display frequency: 1240.0000 MHz
• Transmitting
• Display frequency: 1300.0000 MHz
• Transmitting
• Display frequency: 1270.0000 MHz
• Set an SSG as
:
Frequency : 10.8500 MHz
Level
: 18 mV* (–22 dBm)
• Transmitting
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
Rear
panel
Rear
panel
Connect a digital
multimeter or oscillo-
scope to check point
CP701.
Connect a digital
multimeter or oscillo-
scope to check point
CP501.
Connect a spectram
analyzer to check
point CP311.
Connect a spectram
analyzer to check
point CP311.
Connect a digital
multimeter between
check points CP321
and CP322.
Connect an RF
power meter to [12
ANT].
Connect an RF
power meter to [12
ANT].
2.6–3.8 V
6.0–7.0 V
3.4–4.4 V
–34 dBm (16 dB gain)
–14 dBm (20 dB of gain
difference between the
attenuator ON and
OFF.)
0.5 V
voltage difference
5 W
Read the RF power
meter indication.
Same power as step 2
5 W
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
MAIN
(UX-910)
Verify
Verify
R224
R288
R13
Adjust
SSG’s
level
Verify
C332
R83
Repeat step 2 and step 3 several times until power difference is minimum.
Содержание IC-910H
Страница 1: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 23 SCHEMATIC DIAGRAM 33 Nov 2008 ...
Страница 26: ...Nov 2008 25 DISPLAY UNIT TOP VIEW The combination of top side and bottom side of this ...
Страница 33: ...Nov 2008 32 MAIN UNIT BOT VIEW The combination of top side and bottom side of this ...
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Страница 121: ...9 5 9 11 DISPLAY BOARD TOP VIEW 8 5 1 4 1 8 16 9 1 8 16 9 1 8 16 9 ...
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Страница 126: ...9 10 BOTTOM VIEW PLL UNIT R341 MP11 ...
Страница 130: ...9 14 BOTTOM VIEW UX 910 MAIN UNIT 1 4 8 5 ...
Страница 144: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13714HZ C1 2001 Icom Inc ...