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Fig.1 Block diagram.

handbook, full pagewidth

MEH139

DETUNE

DETECTOR

0.5

mA

3.7 k

Ω

8.3 k

Ω

560 pF

33 pF

QL = 20

fo = 10.7 MHz

33 pF

6.8 nF

audio

outputs

10

Ω

0.1

µF

47

µF

3.7 k

Ω

V2

MUTE

ATTENUATOR

QUADRATURE

DEMODULATOR

RES1

IF1

CPS

VP

VP

V1

V2

RES2

IF2

VoAF1

VAF

−VAF

VoAF2

n.c.

10

9

8

Vi(det)

12

n.c.

11

Vo(det)

13

Vref

14

VF0

16

ViIF

17

VFB2

VFB1

0.1

µF

0.1

µF

ViIF

RS

RS

18

GND

2 V (RMS)

20

19

VF

15

7

6

5

4

3

2

1

FMON

FM

on

REFERENCE

VOLTAGE

reference

voltage

detune

voltage

zero adjustment

of

field strength

indicator

field strength

LEVEL DETECTOR

4-STAGE

LIMITER/

AMPLIFIER

+4.9 V

+8.5 V

3.6 k

Ω

25

k

Ω

25

k

Ω

1 nF

0.47

µF

1 mA

TDA1576T