Kenwood TK-480 User Manual download pdf (Page 50)

TK-480/481

LEVEL DIAGRAM (TK-480)

RX Section

VCO

IC14

C131

PLL

Q10

C136

Q17

C193

Q11

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

LPF

ALC

COMP

IDC

DAC

15 16

IC12

16.6mVrms

17.2mVrms 39.2mVrms 331mVrms 320mVrms

310mVrms

IC4 IC3 (1/2) IC4

487mVrms 179mVrms 311mVrms 154mVrms

DAC

IC12

C58

IC3

IC4

AMP

IC300

500mW

(BTL)

203mVrms 287mVrms 419mVrms 135mVrms 29mVrms

C169

L30

ANT

C143

L11

C139

Q9 C122

L20

C110

R60

XF1

R51

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)

241mVrms 265mVrms

–79.2dBm –80.2dBm

RF (860.50MHz)

IF1 (44.85MHz)

IF2

(455kHz)

To 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.

To make measurements in the

AF section, connect the

oscilloscope proves directly.

In the RF section, use a 1000pF

coupling capacitor.

TX Section

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Kenwood TK-480 User Manual Page 50

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