Kenwood TK-480 User Manual

TK-480/481

VCO

IC14

*

C131

PLL

Q10

C136

Q17

C193

Q11

D5

C149

Q12

C152

Power

module

D7

C169

L30

ANT

2.5W

–11.7dBm

(Q10 open)

–7.8dBm

(Q17 open)

–1.9dBm

(D5 open)

+7.1dBm

(Q12 open)

+17.5dBm

(C152 open)

RF (815.50MHz)

EMC

MIC

12

LPF

ALC

COMP

SW

IDC

6

DAC

I5

O5

DAC

I2

O2

13

15

16

18

19

9

8

IC12

16.6mV

rms

17.2mV

rms

39.2mV

rms

331mV

rms

320mV

rms

310mV

rms

IC4

IC3 (1/2)

IC4

*

487mV

rms

179mV

rms

311mV

rms

154mV

rms

AF

5

43

41

DAC

*

IC12

C58

IC3

IC4

AF

AMP

IC300

SP

500mW

(BTL)

203mV

rms

287mV

rms

419mV

rms

135mV

rms

29mV

rms

AF

C169

L30

ANT

C143

L11

C139

Q9

C122

L20

C110

Q6

R60

XF1

R51

Q5

C55

FM IF

SYSTEM

CF1,2

IC8

AMP

*

–118.0dBm

–119.0dBm

–119.4dBm

–120.4dBm

–107.0dBm

–110.3dBm

–106.8dBm

–116.4dBm

–109.6dBm

(C55 open)

241mV

rms

265mV

rms

–79.2dBm

–80.2dBm

RF (860.50MHz)

IF1 (44.85MHz)

IF2

(455kHz)

AF

T

o

 make measurements in the AF section,

connect the oscilloscope proves directly.

(ANT input : –47dBm, 1kHz FM, 3kHz dev

.)

In the RF section, use a 1000pF coupling capacitor

.

(The display shows the SSG input value required

to obtain 12dB SINAD.)

AG is set to the MIC input

becomes 3kHz Dev at 1kHz MOD.

T

o

 make measurements in the

AF section, connect the

oscilloscope proves directly.

In the RF section, use a 1000pF

coupling capacitor

.