Icom IC-910H User Manual download pdf (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

• Display frequency:

[EUR], [KOR] 145.0000 MHz

[USA-1], [AUS] 146.0000 MHz

• Mode : CW

• 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

Rear

panel

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

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.

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Icom IC-910H User Manual Page 26

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