Icom IC-910H - Manual (Page 26)

PA UNIT
PRESETTING
IDLING
CURRENT
(for 144 M)
(for 430 M)
RF PEAK
(for 430 M)
(for 144 M)
IF PEAK
CARRIER
SUPPRESSION
• Preset R131, R135, R150, R650 (PA unit) to max. counter clockwise.
• Preset R3, R138, R503 (PA unit) to center position.
• Preset C154, C659 (PA unit) to center position as illustration at right.
5 - 8
5-5 TRANSMITTER ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
2
3
4
1
2
3
4
1
1
2
3
• Display frequency:
[EUR], [KOR] 145.0000 MHz
[USA-1], [AUS] 146.0000 MHz
• Mode : CW
• Transmitting
• Transmitting
• Transmitting
• Display frequency:
[EUR], [KOR] 435.0000 MHz
[USA-1], [AUS] 450.0000 MHz
• Mode : CW
• Transmitting
• Display frequency: 440.0000 MHz
• Connect an SSG to P1 on the PA
unit via the JIG cable (A) and set as:
Frequency : 10.850 MHz
Level
: 18 mV* (–22 dBm)
Modulation : OFF
• Transmitting
• Set an SSG as:
Level : 0.79 µV* (–2 dBm)
• Transmitting
• Connect an SSG to P501 on the PA
unit via the JIG cable (A) and set as:
Frequency : 10.850 MHz
Level
: 18 mV* (–22 dBm)
Modulation : OFF
• Display frequency: 146.0000 MHz
• Set an SSG as:
Level : 0.79 µV* (–2 dBm)
• Transmitting
• Display frequency: Any
• Mode
: USB
• MIC gain : Center
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 2 mVrms
• Transmitting
• Display frequency: Any
• Mode
: USB
• Mic gain : Minimum
• Apply no audio signals to [MIC]
connector.
• Transmitting
• Mode : LSB
• Transmitting
PA
Rear
panel
MAIN
MAIN
Connect an ammeter
(3 A) between power
supply and the IC-
910H.
Connect an RF
power meter to [UHF
ANT] connector.
Connect an RF
power meter to [VHF
ANT] connector.
Connect an RF volt-
meter to check point
J51 via the JIG cable
(B).
Connect a spectrum
analyzer to check
point J51 via the JIG
cable (B).
At the point where the
TX current increases
0.5 A.
At the point where the
TX current increases
1.0 A as step 1.
At the point where the
TX current increases
0.5 A as step 2.
At the point where the
TX current increases
1.0 A.
Maximum output
power
Maximum output
power
Maximum level
Minimum carrier level
PA
PA
PA
MAIN
MAIN
R131
R135
(R138)
R650
R150
L1, L2
C154
C659
L2, L3
R206,
R215
• Repeat step 1, step 2 several times.
Refer page 5-16 software adjustment 6.