FILTER TEMPLATES

Receive and Transmit Filter

Intermediate FrequencyFilter

Frequency

(kHz)

Gain (dB)

Frequency

(kHz)

Gain (dB)

Min.

Typ.

Max.

Min.

Typ.

Max.

92

- 30

2.4

- 35

126.45

- 5

- 3

- 2

4.3

- 4

- 3

- 1

Ref 132.45

0

Ref 5.4

0

138.45

- 5

- 3

- 2

6.5

- 5

- 3

- 2

180

- 30

11.6

- 35

APPLICATION SCHEMATIC INFORMATIONS

RESISTORS

CAPACITORS

R1

180

Ω

C1

1

µF

Ceramic 50

R2

2.2

Ω

C2

470nF

Paper, class X2

R3

2.2

Ω

C3 (2)

22pF

10%

Ceramic 10V

R4

2.2

Ω

C4 (2)

22pF

10%

Ceramic 10V

R5

2.2

Ω

C5

100nF

10%

Ceramic 10V

R6

180

Ω

C6

6.8nF

5%

Plastic Film 50V

R7

47k

Ω

C7

100nF

Ceramic 10V

R8

1k

Ω

C8

2.2

µF

R9

1k

Ω

5%

C9

100nF

Ceramic 10V

R11

47k

Ω

C10

2.2

µF

INDUCTOR

C11 (1)

100nF

Ceramic 10V

L1

10

µH

≅ 1.5Ω

C12 (1)

100nF

Ceramic 10V

TRANSISTORS

TRANSIL

Q1 : 2N2907

Q2 : 2N2222

Q3 : 2N2222

Q4 : 2N2907

Q5 : 2N2907

Q6 : 2N2222

TRL1 : SGS-THOMSON P6KE6V8CP

TRANSFORMER

TR1 : TOKO T1002 N

CRYSTAL

QTZ1 : 11.0592MHz parallel resonance

Notes :

1.

These capacitors might not be necessary if the overall power supplies decoupling is sufficient.

2.

The value of these capacitors depends on the crystal parameters.

ST7537HS1

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