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