5-2 PLL ADJUSTMENT

ADJUSTMENT

ADJUSTMENT CONDITIONS

MEASUREMENT

 

VALUE

ADJUSTMENT

 

 

 

 

 

UNIT

LOCATION

 

UNIT

ADJUST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLL LOCK

1

• Operating frequency:

 

MAIN

Connect a digital multi

 

1.3 V

MAIN

L11

VOLTAGE

 

400.000 MHz A

 

meter to check point

 

 

 

 

 

 

440.000

MHz B

 

LV.

 

 

 

 

 

 

470.000

NHz C

 

 

 

 

 

 

 

 

490.000

MHz D, E

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

• Transmitting

 

 

 

 

1.3 V B

 

L405

 

 

 

 

 

 

 

1.05 V (except B)

 

 

 

 

 

 

 

 

 

 

 

 

 

3

• Operating frequency:

 

 

 

 

3.0–4.5 V

 

Verify

 

 

430.000

MHz A

 

 

 

(A, B, C)

 

 

 

 

470.000

MHz B

 

 

 

2.0–3.7 V D

 

 

 

 

500.000

MHz C

 

 

 

2.5–4.2 V E

 

 

 

 

512.000

MHz D

 

 

 

 

 

 

 

 

520.000

MHz E

 

 

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

• Transmitting

 

 

 

 

3.0–4.5 V A, C

 

 

 

 

 

 

 

 

 

2.7–4.2 V B

 

 

 

 

 

 

 

 

 

2.0–3.7 V D

 

 

 

 

 

 

 

 

 

2.5–4.2 V E

 

 

 

 

 

 

 

 

 

 

 

 

A: 400–430 MHz

B: 440–470 MHz

C: 470–500 MHz

D: 490–512 MHz

E: 490–520 MHz

 

ˆ: N-type

: W-type

˜: M-type

 

 

 

 

 

MAIN UNIT

RF power meter

L405

L11

PLL lock voltage adjustment

LV

PLL lock voltage check point

Bottom view

5 - 4

Page 55
Image 55
Icom IC-F3GT, IC-F3GS service manual L405 L11